CROWN CASTLE INTERNATIONAL CORP
S-1/A, 1998-07-02
COMMUNICATIONS SERVICES, NEC
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<PAGE>
 
      
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 2, 1998     
                                                   
                                                REGISTRATION NO. 333-57283     
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                               ---------------
                                
                             AMENDMENT NO. 1     
                                       
                                    TO     
                                   FORM S-1
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
 
                               ---------------
 
                       CROWN CASTLE INTERNATIONAL CORP.
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
        DELAWARE                     4899                  76-0470458
(STATE OR OTHER JURISDICTION   (PRIMARY STANDARD        (I.R.S. EMPLOYER
 OF INCORPORATION OR             INDUSTRIAL           IDENTIFICATION NUMBER)
    ORGANIZATION)            CLASSIFICATION NUMBER)
  
                               510 BERING DRIVE
                                   SUITE 500
                             HOUSTON, TEXAS 77057
                                (713) 570-3000
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
 
                               ---------------
 
                           MR. CHARLES C. GREEN, III
                           EXECUTIVE VICE PRESIDENT
                          AND CHIEF FINANCIAL OFFICER
                       CROWN CASTLE INTERNATIONAL CORP.
                               510 BERING DRIVE
                                   SUITE 500
                             HOUSTON, TEXAS 77057
                                (713) 570-3000
(NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
 
                               ---------------
 
                                  COPIES TO:
        STEPHEN L. BURNS, ESQ.               KIRK A. DAVENPORT, ESQ.
        CRAVATH, SWAINE & MOORE                 LATHAM & WATKINS
           825 EIGHTH AVENUE                    885 THIRD AVENUE
       NEW YORK, NEW YORK 10019             NEW YORK, NEW YORK 10022
 
                               ---------------
 
  APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
 
  If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. [_]
 
  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [_]
 
  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
  If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]
 
  If the delivery of the prospectus is expected to be made pursuant to Rule
434, please check the following box. [_]
       
  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH
SECTION 8(A) OF THE SECURITIES ACT OF 1933, OR UNTIL THE REGISTRATION
STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING
PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
                                    PART II
 
                  INFORMATION NOT REQUIRED IN THE PROSPECTUS
 
ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
  Set forth below is a table of the registration fee for the Securities and
Exchange Commission, the filing fee for the National Association of Securities
Dealers, Inc., the listing fee for the New York Stock Exchange and estimates
of all other expenses to be incurred in connection with the issuance and
distribution of the securities described in the Registration Statement, other
than underwriting discounts and commissions:
 
<TABLE>
      <S>                                                               <C>
      SEC registration fee............................................. $88,500
      NASD filing fee..................................................  30,500
      NYSE listing fee.................................................    *
      Printing and engraving expenses..................................    *
      Legal fees and expenses..........................................    *
      Accounting fees and expenses.....................................    *
      Transfer agent and registrar fees................................    *
      Miscellaneous....................................................    *
                                                                        -------
        Total.......................................................... $
                                                                        =======
</TABLE>
- --------
* To be completed by amendment.
 
ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
  Section 145 of the General Corporation Law of the State of Delaware ("DGCL")
provides that a corporation has the power to indemnify any director or
officer, or former director or officer, who was or is a party or is threatened
to be made a party to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative (other
than an action by or in the right of the corporation) against the expenses
(including attorney's fees), judgments, fines or amounts paid in settlement
actually and reasonably incurred by them in connection with the defense of any
action by reason of being or having been directors or officers, if such person
shall have acted in good faith and in a manner reasonably believed to be in or
not opposed to the best interests of the corporation, and, with respect to any
criminal action or proceeding, provided that such person had no reasonable
cause to believe his conduct was unlawful, except that, if such action shall
be in the right of the corporation, no such indemnification shall be provided
as to any claim, issue or matter as to which such person shall have been
judged to have been liable to the corporation unless and to the extent that
the Court of Chancery of the State of Delaware (the "Court of Chancery"), or
any court in such suit or action was brought, shall determine upon application
that, in view of all of the circumstances of the case, such person is fairly
and reasonably entitled to indemnify for such expenses as such court shall
deem proper.
 
  Accordingly, the Certificate of Incorporation and the amendments thereto
dated July 2, 1996, February 19, 1997, June 16, 1997, and October 31, 1997 of
the Company (filed herewith as Exhibits 3.1 through 3.5) provide that the
Company shall, to the maximum extent permitted from time to time under the
DGCL indemnify and upon request shall advance expenses to any person who is or
was a party or is threatened to be made a party to any threatened, pending or
completed action, suit, proceeding or claim, whether civil, criminal,
administrative or investigative, by reason or the fact that he is or was or
has agreed to be a director, officer of the Company or while a director or
officer is or was serving at the request of the Company as a director,
officer, partner, trustee, employee or agent of any corporation, partnership,
joint venture, trust or other enterprise, including service with respect to
employee benefits plans, against any and all expenses (including attorney's
fees and expenses), judgments, fines, penalties and amounts paid in settlement
or incurred in connection with the investigation, preparation to defend or
defense of such action, suit, proceeding or claim; provided, however, that the
foregoing shall not require the Company to indemnify or advance expenses to
any person in connection with any action, suit, proceeding, claim or
counterclaim initiated by or on behalf of such person. Such indemnification
shall not
 
                                     II-1
<PAGE>
 
be exclusive of other indemnification rights arising under any by-law,
agreement, vote of directors or stockholders or otherwise and shall inure to
the benefit of the heirs and legal representatives of such person.
 
  Furthermore, a director of the Company shall not be liable to the Company or
its stockholders for monetary damages for breach of fiduciary duty as a
director, except to the extent that such exemption from liability or
limitation thereof is not permitted under the DGCL as currently in effect or
as the same may hereafter be amended.
 
  The Company's By-laws provide that the Company shall indemnify any person
who was or is party or is threatened to be made a party to any threatened,
pending or completed action, suit or proceeding, whether civil, criminal,
administrative or investigative (other than an action by or in the right of
the Company) by reason of the fact that he is or was a director, officer,
employee or agent of the Company, or is or was serving at the request of the
Company as a director, officer, employee or agent of another corporation,
partnership, joint venture, trust or other enterprise, against expenses
(including attorney's fees), judgments, fines and amounts paid in settlement
actually and reasonably incurred by him in connection with such action, suit
or proceeding if he acted in good faith and in a manner he reasonably believed
to be in or not opposed to the best interests of the Company, and, with
respect to any criminal action or proceeding, had no reasonable cause to
believe his conduct was unlawful.
 
  The Company's By-laws further provide that the Company shall similarly
indemnify any person who was or is a party or is threatened to be made a party
to any threatened, pending or completed action or suit by or in the right of
the corporation except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the Company unless and only to the extent that the Court of Chancery
or the court in which such action or suit was brought shall determine upon
application that, despite the adjudication of liability but in view of all the
circumstances of the case, such person is fairly and reasonably entitled to
indemnify for such expenses which the Court of Chancery or such other court
shall deem proper.
 
ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES
 
  In each of the sales described below, unless otherwise indicated, the
Company (or the relevant predecessor) relied on Section 4(2) of the Securities
Act of 1933 for exemption from registration. No brokers or underwriters were
used in connection with any of such sales. The recipients of securities in
each such transaction represented their intention to acquire the securities
for investment only and not with a view to or for sale in connection with any
distribution thereof and appropriate legends were affixed to the share
certificates, warrants and notes issued in such transactions. All recipients
had adequate access, through their relationship with the Company, to
information about the Company.
 
  Through May 31, 1998, the Company had raised approximately $367.0 million
through private sales of debt and equity securities in a series of private
placements with various institutional and other accredited investors and
certain employees of the Company as described below.
 
  CTC Investment. On January 11, 1995, CTC, a predecessor to CCIC, sold (i) to
Ted B. Miller, Jr. and Edward C. Hutcheson, Jr. (collectively, the "Initial
Stockholders") 270,000 shares of Class A Common Stock, par value $.01 per
share, of CTC for $270,000 and (ii) to Centennial Fund IV, Berkshire Fund III,
A Limited Partnership (via Berkshire Fund III Investment Corp.) and certain
trusts and natural persons that are now members of Berkshire Investors LLC
(collectively, the "Berkshire Fund III Group") and J. Landis Martin
(collectively, the "CTC Purchasers"), (A) 270,000 shares Class B Common Stock,
par value $.01 per share, of CTC for $270,000, (B) 730,380 shares of Series A
Convertible Preferred Stock, par value $.01 per share, of CTC for $4,382,280
and (C) $3,867,720 principal amount of Convertible Secured Subordinated Notes
of CTC (the "CTC Notes") for $3,867,720. As of February 1997, all the CTC
Notes had been converted into 644,620 shares of Series A Convertible Preferred
Stock of the Company. The proceeds received on January 11, 1995 were used by
CTC for the acquisition of towers and ancillary assets from PCI and for
working capital.
 
 
                                     II-2
<PAGE>
 
  Pursuant to a Securities Exchange Agreement (the "Securities Exchange
Agreement"), dated as of April 27, 1995, among the Company, CTC, the Initial
Stockholders and the CTC Purchasers, such parties effectively made CCIC the
holding company of CTC and converted some of the obligations of CTC into
capital stock of CCIC. Transactions pursuant to the Securities Exchange
Agreement included (i) Centennial Fund IV transferring 208,334 shares of CTC
Series A Convertible Preferred Stock to Berkshire Fund III Group in exchange
for $1,250,004 principal amount of CTC Notes, (ii) Berkshire Fund III Group
and J. Landis Martin converting all remaining CTC Notes held by them ($742,452
principal amount) into 123,742 shares of CTC Series A Convertible Preferred
Stock, (iii) all the outstanding shares of capital stock of CTC being
exchanged for similar stock of CCIC and (iv) the remaining CTC Notes
($3,125,268 principal amount) becoming convertible into shares of Series A
Convertible Preferred Stock (all of which CTC Notes were subsequently
converted in February 1997).
 
  As a result of the exchange of CTC capital stock for CCIC capital stock,
each Initial Stockholder received 135,000 shares of existing Class A Common
Stock, Centennial Fund IV received 216,000 shares of Class B Common Stock and
145,789 shares of Series A Preferred Stock, Mr. Martin received 41,666 shares
of Series A Preferred Stock and Berkshire Fund III Group received 54,000
shares of Class B Common Stock and 666,667 shares of Series A Preferred Stock.
In July 21, 1995, Robert F. McKenzie became a party by amendment to the
Securities Exchange Agreement and received 8,333 shares of Series A Preferred
Stock.
 
  1996 Investors Investment. Pursuant to a Securities Purchase Agreement,
dated as of July 15, 1996, among the Company, Berkshire Fund III Group,
Centennial Fund IV, J. Landis Martin, Edward C. Hutcheson, Jr. and Robert F.
McKenzie, the Company privately placed 864,568 shares of its Series B
Convertible Preferred Stock, par value $.01 per share ("Series B Convertible
Preferred Stock"), for an aggregate purchase price of $10,374,816. Berkshire
Fund III Group paid $6,000,000 for 500,000 shares, Centennial Fund IV paid
$3,724,812 for 310,401 shares, Mr. Martin paid $500,004 for 41,667 shares, Mr.
Hutcheson paid $99,996 for 8,333 shares and Mr. McKenzie paid $50,004 for
4,167 shares. The proceeds received on July 15, 1996 were used for (i) the
purchase of the towers and microwave and SMR businesses from Motorola in
Puerto Rico, (ii) an option payment relating to the acquisition of TEA and
TeleStructures and (iii) working capital.
 
  Berkshire Fund IV Investment. Pursuant to a Securities Purchase Agreement,
dated as of February 14, 1997, among the Company, Centennial Fund V and
Centennial Entrepreneurs Fund V, L.P. (collectively, the "Centennial Fund V
Investors" and, together with Centennial Fund IV, the "Centennial Group"),
Berkshire Fund IV, Limited Partnership (via Berkshire Fund IV Investment
Corp.), and certain trusts and natural persons which are members of Berkshire
Investors LLC (collectively, the "Berkshire Fund IV Group" and, together with
Berkshire Fund III Group, the "Berkshire Partners Group"), PNC Venture Corp.,
Nassau Capital Partners II L.P. ("Nassau Capital"), NAS Partners I L.L.C.
("NAS Partners" and, together with Nassau Capital, the "Nassau Group"), Fay,
Richwhite Communications Limited ("Fay Richwhite"), J. Landis Martin and
Robert F. McKenzie, the Company privately placed 3,529,832 shares of its
Series C Convertible Preferred Stock, par value $.01 per share ("Series C
Convertible Preferred Stock"), for an aggregate purchase price of $74,126,472.
Centennial Fund V Investors paid $15,464,001 for 736,381 shares, Berkshire
Fund IV Group paid $21,809,991 for 1,038,571 shares, PNC Venture Corp. paid
$6,300,000 for 300,000 shares, Nassau Group paid an aggregate of $19,499,991
for 928,571 shares, Fay Richwhite paid $9,999,990 for 476,190 shares, Mr.
Martin paid $999,999 for 47,619 shares and Mr. McKenzie paid $52,500 for 2,500
shares. The proceeds received on February 14, 1997 were used by the Company to
fund a portion of its investment in CTI.
 
  Hutcheson Investment. In March 1997, Edward C. Hutcheson, Jr. exercised
stock options for 69,000 shares of Class B Common Stock. The Company
repurchased these shares and 61,687 shares of his existing Class A Common
Stock for $3,422,118.
 
  TEA Investment. In May 1997, in connection with the Company's acquisition of
the stock of TeleStructures, TEA and TeleShare, Inc. (the "TEA Companies"),
the Company issued 107,142 shares of Class B Common Stock to the shareholders
of the TEA Companies: 48,214 shares to Bruce W. Neurohr, 48,214 shares to
Charles H. Jones and 10,714 shares to Terrel W. Pugh.
 
                                     II-3
<PAGE>
 
  Crown Investment. In August 1997, Robert A. Crown and Barbara Crown sold the
assets of Crown Communications to, and merged CNSI and CMSI with, subsidiaries
of the Company. As partial consideration for these transactions, the Crowns
received 1,465,000 shares of Class B Common Stock. Robert A. Crown and Barbara
Crown are both parties to the Stockholders Agreement and are subject to its
restrictions.
 
  AHA Investment. Pursuant to a Securities Purchase Agreement, dated as of
August 13, 1997, among the Company, American Home Assurance Company ("AHA"),
New York Life Insurance Company ("New York Life"), The Northwestern Mutual
Life Insurance Company ("Northwestern Mutual"), PNC Venture Corp., J. Landis
Martin and affiliates of AHA, the Company privately placed of 292,995 shares
of its Senior Convertible Preferred Stock for an aggregate purchase price of
$29,299,500, together with warrants to purchase 117,198 shares of Class B
Common Stock at $37.54 per share (subject to adjustment, including weighted
average antidilution adjustments). AHA and its affiliates paid $15,099,500 for
150,995 shares and warrants to purchase 60,338 shares of Class B Common Stock.
New York Life and Northwestern Mutual each paid $6,000,000 for 60,000 shares
and warrants to purchase 24,000 shares of Class B Common Stock. PNC Venture
Corp. paid $2,000,000 for 20,000 shares and warrants to purchase 8,000 shares
of Class B Common Stock. Mr. Martin paid $200,000 for 2,000 shares and
warrants to purchase 800 shares of Class B Common Stock. The proceeds received
on August 13, 1997 were used by the Company to fund a portion of the Crown
Merger and working capital.
 
  Harvard Investment. Pursuant to a Securities Purchase Agreement, dated as of
October 31, 1997, among the Company, Berkshire Partners Group, Centennial Fund
V Investors, Nassau Group, Fay Richwhite, Harvard Private Capital Holdings,
Inc. ("Harvard"), Prime VIII, L.P. ("Prime") and the prior purchasers of
Senior Convertible Preferred Stock (other than affiliates of AHA), an
additional 364,500 shares of Senior Convertible Preferred Stock were issued
for an aggregate purchase price of $36,450,000, together with warrants to
purchase 145,800 shares of Class B Common Stock at $37.54 per share (subject
to adjustment, including weighted average antidilution adjustments). Berkshire
Partners Group paid $3,500,000 for 35,000 shares and warrants to purchase
14,000 shares of Class B Common Stock. Centennial V Investors paid $1,000,000
for 10,000 shares and warrants to purchase 4,000 shares of Class B Common
Stock. Nassau Group and Fay Richwhite each paid $2,500,000 for 25,000 shares
and warrants to purchase 10,000 shares of Class B Common Stock. Harvard paid
$14,950,000 for 149,500 shares and warrants to purchase 59,800 shares of Class
B Common Stock. Prime paid $5,000,000 for $50,000 shares and warrants to
purchase 20,000 shares of Class B Common Stock. AHA paid $1,500,000 for 15,000
shares and warrants to purchase 6,000 shares of Class B Common Stock. New York
Life paid $300,000 for 3,000 shares and warrants to purchase 1,200 shares of
Class B Common Stock. Northwestern Mutual paid $4,000,000 for 40,000 shares
and warrants to purchase 16,000 shares of Class B Common Stock. PNC Venture
Corp. paid $1,000,000 for 10,000 shares and warrants to purchase 4,000 shares
of Class B Common Stock. J. Landis Martin paid $200,000 for 2,000 shares and
warrants to purchase 600 shares of Class B Common Stock.
 
  Employee Purchases. On October 30, 1995, in connection with an employment
agreement, an employee of the Company purchased 16,666 shares of Class B
Common Stock from the Company at $6.00 per share. On October 1, 1996, David L.
Ivy purchased 10,000 shares of Class B Common Stock from the Company at $12.00
per share. On February 3, 1997, John L. Gwyn purchased 500 shares of Class B
Common Stock from the Company at $21.00 per share. On June 12, 1997, an
employee of the Company purchased 500 shares of Class B Common Stock from the
Company at $21.00 per share.
 
  Option Exercises. On July 30, 1997, Robert F. McKenzie, a director of the
Company, exercised options for 1,250 shares of Class B Common Stock at an
exercise price of $6.00 per share and on August 8, 1997, exercised options for
2,375 shares of Class B Common Stock at an exercise price of $21.00 per share.
 
  10 5/8% Senior Discount Notes due 2007. On November 20, 1997, the Company
privately placed under Rule 144A and Regulation S of the Securities Act $251.0
million principal amount at maturity ($150,010,150 initial accreted value) of
its 10 5/8% Senior Discount Notes due 2007, yielding net proceeds to the
Company of approximately $143.7 million after deducting discounts and
estimated fees and expenses. Lehman Brothers Inc. and Credit Suisse First
Boston Corporation were the initial purchasers of such securities.
 
                                     II-4
<PAGE>
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
  (a) Exhibits
 
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                           DESCRIPTION OF EXHIBIT
 -------                         ----------------------
 <C>     <S>
   *1.1  --Form of Underwriting Agreement.
  **2.1  --Asset Purchase and Merger Agreement among Crown Network Systems,
          Inc., Crown Mobile Systems, Inc., Robert A. Crown, Barbara Crown and
          Castle Acquisition Corp. I, Castle Acquisition Corp. II, Castle Tower
          Holding Corp. dated July 11, 1997.
  **2.2  --First Amended and Restated Asset Purchase and Merger Agreement among
          Crown Network Systems, Inc., Crown Mobile Systems, Inc., Robert A.
          Crown, Barbara Crown and Castle Acquisition Corp. I, Castle
          Acquisition Corp. II, Castle Tower Holding Corp. dated July 11, 1997,
          as amended and restated on August 14, 1997.
  **2.3  --Stock Purchase Agreement by and between Castle Tower Holding Corp.,
          Bruce W. Neurohr, Charles H. Jones, Ronald J. Minnich, Ferdinand G.
          Neurohr and Terrel W. Pugh dated May 12, 1997 ("TEA Stock Purchase
          Agreement").
   *2.4  --Share Exchange Agreement among Castle Transmission Services
          (Holdings) Ltd., Crown Castle International Corp., TeleDiffusion de
          France International S.A., Digital Future Investments B.V. and
          certain shareholders of Castle Transmission Services (Holdings) Ltd.
          dated as of April 24, 1998.
  **3.1  --Certificate of Incorporation of Castle Tower Holding Corp. dated
          April 26, 1995.
  **3.2  --Certificate of Amendment of Certificate of Incorporation of Castle
          Tower Holding Corp. dated July 2, 1996.
  **3.3  --Certificate of Amendment of Certificate of Incorporation of Castle
          Tower Holding Corp. dated February 19, 1997.
  **3.4  --Certificate of Amendment of Certificate of Incorporation of Castle
          Tower Holding Corp. dated June 16, 1997.
  **3.5  --Certificate of Amendment of Certificate of Incorporation of Castle
          Tower Holding Corp. dated October 31, 1997.
  **3.6  --Amended and Restated Bylaws of Castle Tower Holding Corp. dated
          February 24, 1997.
   *3.7  --Form of Restated Certificate of Incorporation of Crown Castle
          International Corp.
   *3.8  --Form of Amended and Restated Bylaws of Crown Castle International
          Corp.
  **4.1  --Indenture between Crown Castle International Corp. and United States
          Trust Company of New York, as trustee (including exhibits).
  **4.2  --Amended and Restated Stockholders Agreement among Castle Tower
          Holding Corp., Edward C. Hutcheson, Jr., Ted B. Miller, Jr., Robert
          A. Crown and Barbara Crown and the persons listed on Schedule I
          thereto dated August 15, 1997.
   *4.3  --Article Fourth of Certificate of Incorporation of Castle Tower
          Holding Corp. (included in Exhibits 3.1 through 3.5).
  **4.4  --Trust Deed related to (Pounds)125,000,000 9 per cent. Guaranteed
          Bonds due 2007 among Castle Transmission (Finance) PLC, as Issuer,
          Castle Transmission International Ltd and Castle Transmission
          Services (Holdings) Ltd., as Guarantors, and The Law Debenture Trust
          Corporation p.l.c., as Trustee, dated May 21, 1997.
  **4.5  --First Supplemental Trust Deed related to (Pounds)125,000,000 9 per
          cent. Guaranteed Bonds due 2007 among Castle Transmission (Finance)
          PLC, as Issuer, Castle Transmission International Ltd and Castle
          Transmission Services (Holdings) Ltd, as Guarantors and The Law
          Debenture Trust Corporation p.l.c., as Trustee, dated October 17,
          1997.
</TABLE>
 
 
                                      II-5
<PAGE>
 
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                            DESCRIPTION OF EXHIBIT
 --------                         ----------------------
 <C>      <S>
    *4.6  --Specimen Certificate of Common Stock.
    *5.   --Opinion of Cravath, Swaine & Moore with respect to the legality of
           the Common Stock.
  **10.1  --Registration Rights Agreement by and among Crown Castle
           International Corp. and Lehman Brothers Inc. and Credit Suisse First
           Boston Corporation dated as of November 25, 1997.
  **10.2  --Loan Agreement by and among Castle Tower Corporation, KeyBank
           National Association (formerly known as "Society National Bank") and
           certain lenders dated April 26, 1995 ("KeyBank Loan Agreement").
  **10.3  --First Amendment to KeyBank Loan Agreement dated June 26, 1996.
  **10.4  --Second Amendment to KeyBank Loan Agreement dated January 17, 1997.
  **10.5  --Third Amendment to KeyBank Loan Agreement dated April 3, 1997.
  **10.6  --Fourth Amendment to KeyBank Loan Agreement dated October 31, 1997.
  **10.7  --Fifth Amendment to KeyBank Loan Agreement dated November 24, 1997.
  **10.8  --Amended and Restated Limited Holdco Guaranty by Crown Castle
           International Corp., in favor of KeyBank National Association, as
           Agent, dated November 25, 1997.
  **10.9  --Memorandum of Understanding regarding Management and Governance of
           Castle Tower Holding Corp. and Crown Communications, Inc. dated
           August 15, 1997.
 +**10.10 --Site Commitment Agreement between Nextel Communications, Inc. and
           Castle Tower Corporation dated July 11, 1997.
  **10.11 --Independent Contractor Agreement by and between Crown Network
           Systems, Inc. and Sprint Spectrum L.P. dated July 8, 1996, including
           addendum dated November 12, 1997.
 +**10.12 --Independent Contractor Agreement between Crown Network Systems,
           Inc. and Powerfone, Inc. d/b/a Nextel Communications dated September
           30, 1996.
 +**10.13 --Independent Contractor Agreement by and between APT Pittsburgh
           Limited Partnership and Crown Network Systems, Inc. dated December
           3, 1996.
 +**10.14 --Master Lease Agreement between Sprint Spectrum, L.P. and Robert
           Crown d/b/a/ Crown Communications dated June 11, 1996 ("Sprint
           Master Lease Agreement").
   *10.15 --First Amendment to Sprint Master Lease Agreement, dated July 5,
           1996 (included in Exhibit 10.14).
   *10.16 --Second Amendment to Sprint Master Lease Agreement, dated January
           27, 1997 (included in Exhibit 10.14).
 +**10.17 --Master Lease Agreement between Powerfone, Inc. d/b/a/ Nextel
           Communications and Robert A. Crown d/b/a Crown Communications dated
           October 3, 1996.
 +**10.18 --Master Lease Agreement between APT Pittsburgh Limited Partnership
           and Robert Crown d/b/a Crown Communications dated December 3, 1996.
 +**10.19 --Master Tower Lease Agreement between Cellco Partnership d/b/a/ Bell
           Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P. and Pennsylvania RSN
           No. 6 (II) and Robert A. Crown d/b/a/ Crown Communications dated
           December 29, 1995, as amended by a letter agreement dated as of
           October 28, 1997.
 +**10.20 --Master Tower Lease Agreement between Cellco Partnership d/b/a/ Bell
           Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P. and Pennsylvania RSN
           No. 6 (II) and Robert A. Crown d/b/a/ Crown Communications dated
           December 29, 1995, as amended by a letter agreement dated as of
           October 28, 1997.
  **10.21 --Castle Tower Holding Corp. 1995 Stock Option Plan (Third
           Restatement).
</TABLE>
 
 
                                      II-6
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                            DESCRIPTION OF EXHIBIT
 --------                         ----------------------
 <C>      <S>
  **10.22 --Services Agreement between Castle Transmission International Ltd
           (formerly known as Castle Transmission Services Ltd) and Castle
           Tower Holding Corp. dated February 28, 1997.
  **10.23 --Shareholders' Agreement among Berkshire Fund IV Investment Corp.,
           Berkshire Investors LLC, Berkshire Partners LLC, Candover
           Investments PLC, Candover (Trustees) Limited, Candover Partners
           Limited (as general partner for 4 limited partnerships), Castle
           Tower Holding Corp., Telediffusion de France International S.A., and
           Diohold Limited (now known as Castle Transmission Services
           (Holdings) Ltd) dated January 23, 1997.
  **10.24 --First Amendment to Amended and Restated Stockholders Agreement by
           and among Crown Castle International Corp., Edward C. Hutcheson,
           Jr., Ted B. Miller, Jr., Robert A. Crown and Barbara Crown and the
           persons listed as Investors dated January 28, 1998.
  **10.25 --Third Amendment to Sprint Master Lease Agreement, dated February
           12, 1998.
   *10.26 --Form of Stockholders Agreement between Crown Castle International
           Corp. and certain stockholders listed on Schedule 1 thereto.
   *10.27 --Agreement among Castle Transmission Services (Holdings) Ltd.,
           Digital Future Investments B.V., Berkshire Partners LLC and certain
           shareholders of Castle Transmission Services (Holdings) Ltd. for the
           sale and purchase of certain shares of Castle Transmission Services
           (Holdings) Ltd., for the amendment of the Shareholders' Agreement in
           respect of Castle Transmission Services (Holdings) Ltd. and for the
           granting of certain options dated April 24, 1998.
   *10.28 --Form of Governance Agreement among Crown Castle International
           Corp., Telediffusion de France International S.A. and Digital Future
           Investments B.V.
   *10.29 --CTI Operating Agreement
   *10.30 --Form of Shareholders' Agreement among Crown Castle International
           Corp., Telediffusion de France International S.A. and Castle
           Transmission Services (Holdings) Limited.
   *10.31 --Site Sharing Agreement between National Transcommunications Limited
           and The British Broadcasting Corporation dated September 10, 1991.
   +10.32 --Transmission Agreement between The British Broadcasting Corporation
           and Castle Transmission Services Limited dated February 27, 1997.
   +10.33 --Digital Terrestrial Television Transmission Agreement between The
           British Broadcasting Corporation and Castle Transmission
           International Ltd. dated February 10, 1998.
   +10.34 --Agreement for the Provision of Digital Terrestrial Television
           Distribution and Transmission Services between British Digital
           Broadcasting plc and Castle Transmission International Ltd. dated
           December 18, 1997.
   *10.35 --Loan Amendment Agreement among Castle Transmission International,
           Castle Transmission Services (Holdings) Ltd. and certain lenders
           dated May 21, 1997.
   *10.36 --First Amendment to 1995 Stock Option Plan dated April 1, 1998.
   +10.37 --Contract between British Telecommunications PLC and Castle
           Transmission International Inc. for the Provision of Digital
           Terrestrial Television Network Distribution Service dated May 13,
           1998.
   +10.38 --Site Marketing Agreement dated June 25, 1998 between BellSouth
           Mobility Inc. and Crown Communication Inc.
    *11   --Computation of net loss per common share.
   *21    --Subsidiaries of Crown Castle International Corp.
 ***23.1  --Consent of KPMG Peat Marwick LLP.
 ***23.2  --Consent of Ernst & Young LLP.
</TABLE>    
 
 
                                      II-7
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                         DESCRIPTION OF EXHIBIT
 -------                       ----------------------
 <C>     <S>
    23.3 --Consent of Cravath, Swaine & Moore (included in Exhibit 5).
   *24.  --Powers of Attorney.
  **27.1 --Financial Data Schedule for the period ended December 31, 1996.
  **27.2 --Financial Data Schedule for the period ended September 30, 1997.
  **27.3 --Financial Data Schedule for the period ended December 31, 1997.
   *27.4 --Financial Data Schedule for the period ended March 31, 1998.
 ***99.1 --Consent of Michel Azibert.
 ***99.2 --Consent of Bruno Chetaille.
 ***99.3 --Consent of William A. Murphy.
</TABLE>    
- --------
* To be filed by amendment.
** Incorporated by reference to the exhibits with the corresponding exhibit
   numbers in the Registration Statement on Form S-4 previously filed by the
   Registrant (Registration no. 333-47873).
   
*** Previously filed.     
+ Indicates that portions of the exhibit have been omitted pursuant to a
  request for confidential treatment and such portions have been filed with
  the Commission separately.
 
  (b) Financial Statement Schedules
 
  Schedule I--Condensed Financial Information of Registrant
 
  All other schedules are omitted because they are not applicable or because
the required information is contained in the financial statements or notes
thereto included in this Registration Statement.
 
ITEM 17. UNDERTAKINGS
 
  Insofar as indemnification for liabilities arising under the Securities Act
of 1933 (the "Securities Act") may be permitted to directors, officers and
controlling persons of the Registrant pursuant to the foregoing provisions, or
otherwise, the Registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public
policy as expressed in the Securities Act and is, therefore, unenforceable. In
the event that a claim for indemnification against such liabilities (other
than the payment by the Registrant of expenses incurred or paid by a director,
officer or controlling person of the Registrant in the successful defense of
any action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered, the
Registrant will, unless in the opinion of its counsel the matter has been
settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final
adjudication of such issue.
 
  The undersigned Registrant hereby undertakes that:
 
    (1) For purposes of determining any liability under the Securities Act,
  the information omitted from the form of prospectus filed as part of this
  registration statement in reliance upon Rule 430A and contained in a form
  of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or (4) or
  497(h) under the Securities Act shall be deemed to be part of this
  registration statement as of the time it was declared effective.
 
    (2) For the purpose of determining any liability under the Securities
  Act, each post-effective amendment that contains a form of prospectus shall
  be deemed to be a new registration statement relating to the securities
  offered therein, and the offering of such securities at that time shall be
  deemed to be the initial bona fide offering thereof.
 
                                     II-8
<PAGE>
 
                                  SIGNATURES
   
  Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Houston, State of
Texas, on this    day of   , 1998.     
 
                                          Crown Castle International Corp.,
                                                    
                                                 /s/ Charles C. Green, III
                                                     
                                          By: ----------------------------------
                                                 
                                              NAME: CHARLES C. GREEN, III
                                              TITLE: EXECUTIVE VICE PRESIDENT
                                              AND CHIEF FINANCIAL OFFICER     
          
  Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated on this    day of   , 1998.     
 
              SIGNATURE                        TITLE
 
                                       Chief Executive
               *                        Officer and Vice
- -------------------------------------   Chairman of the
         TED B. MILLER, JR.             Board (Principal
                                        Executive Officer)
 
                                       President and
               *                        Director
- -------------------------------------
            DAVID L. IVY
 
                                       Executive Vice
   /s/ Charles C. Green, III            President and Chief
- -------------------------------------   Financial Officer
        CHARLES C. GREEN, III           (Principal
                                        Financial Officer)
 
                                       Vice President,
               *                        Chief Accounting
- -------------------------------------   Officer and
        WESLEY D. CUNNINGHAM            Corporate
                                        Controller
                                        (Principal
                                        Accounting Officer)
 
                                       Chairman of the
               *                        Board
- -------------------------------------
           CARL FERENBACH
 
 
                                     II-9
<PAGE>
 
              SIGNATURE                         TITLE
 
                                        Director
               *     
- -------------------------------------
           ROBERT A. CROWN
 
                                        Director
- -------------------------------------
          GARTH H. GREIMANN
 
                                        Director
               *     
- -------------------------------------
           RANDALL A. HACK
 
                                        Director
               *.     
- -------------------------------------
         DAVID C. HULL, JR.
 
                                        Director
               *     
- -------------------------------------
      EDWARD C. HUTCHESON, JR.
 
                                        Director
               *     
- -------------------------------------
          J. LANDIS MARTIN
 
                                        Director
               *     
- -------------------------------------
         ROBERT F. MCKENZIE
 
                                        Director
               *     
- -------------------------------------
          JEFFREY H. SCHUTZ
    
 *By: /s/ Charles C. Green, III     
  ---------------------------------
    
 CHARLES C. GREEN, III ATTORNEY-IN-
              FACT     
 
                                     II-10
<PAGE>
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                             DESCRIPTION                             PAGE
 -------                           -----------                             ----
 <C>     <S>                                                               <C>
   *1.1  --Form of Underwriting Agreement.
  **2.1  --Asset Purchase and Merger Agreement among Crown Network
          Systems, Inc., Crown Mobile Systems, Inc., Robert A. Crown,
          Barbara Crown and Castle Acquisition Corp. I, Castle
          Acquisition Corp. II, Castle Tower Holding Corp. dated July
          11, 1997.
  **2.2  --First Amended and Restated Asset Purchase and Merger
          Agreement among Crown Network Systems, Inc., Crown Mobile
          Systems, Inc., Robert A. Crown, Barbara Crown and Castle
          Acquisition Corp. I, Castle Acquisition Corp. II, Castle Tower
          Holding Corp. dated July 11, 1997, as amended and restated on
          August 14, 1997.
  **2.3  --Stock Purchase Agreement by and between Castle Tower Holding
          Corp., Bruce W. Neurohr, Charles H. Jones, Ronald J. Minnich,
          Ferdinand G. Neurohr and Terrel W. Pugh dated May 12, 1997
          ("TEA Stock Purchase Agreement").
   *2.4  --Share Exchange Agreement among Castle Transmission Services
          (Holdings) Ltd., Crown Castle International Corp.,
          TeleDiffusion de France International S.A., Digital Future
          Investments B.V. and certain shareholders of Castle
          Transmission Service (Holdings) Ltd. dated as of April 24,
          1998.
  **3.1  --Certificate of Incorporation of Castle Tower Holding Corp.
          dated April 26, 1995.
  **3.2  --Certificate of Amendment of Certificate of Incorporation of
          Castle Tower Holding Corp. dated July 2, 1996.
  **3.3  --Certificate of Amendment of Certificate of Incorporation of
          Castle Tower Holding Corp. dated February 19, 1997.
  **3.4  --Certificate of Amendment of Certificate of Incorporation of
          Castle Tower Holding Corp. dated June 16, 1997.
  **3.5  --Certificate of Amendment of Certificate of Incorporation of
          Castle Tower Holding Corp. dated October 31, 1997.
  **3.6  --Amended and Restated Bylaws of Castle Tower Holding Corp.
          dated February 24, 1997.
   *3.7  --Form of Restated Certificate of Incorporation of Crown Castle
          International Corp.
   *3.8  --Form of Amended and Restated Bylaws of Crown Castle
          International Corp.
  **4.1  --Indenture between Crown Castle International Corp. and United
          States Trust Company of New York, as trustee (including
          exhibits).
  **4.2  --Amended and Restated Stockholders Agreement among Castle
          Tower Holding Corp., Edward C. Hutcheson, Jr., Ted B. Miller,
          Jr., Robert A. Crown and Barbara Crown and the persons listed
          on Schedule I thereto dated August 15, 1997.
   *4.3  --Article Fourth of Certificate of Incorporation of Castle
          Tower Holding Corp. (included in Exhibits 3.1 through 3.5).
  **4.4  --Trust Deed related to (Pounds)125,000,000 9 per cent.
          Guaranteed Bonds due 2007 among Castle Transmission (Finance)
          PLC, as Issuer, Castle Transmission International Ltd and
          Castle Transmission Services (Holdings) Ltd., as Guarantors,
          and The Law Debenture Trust Corporation p.l.c., as Trustee,
          dated May 21, 1997.
  **4.5  --First Supplemental Trust Deed related to (Pounds)125,000,000
          9 per cent. Guaranteed Bonds due 2007 among Castle
          Transmission (Finance) PLC, as Issuer, Castle Transmission
          International Ltd and Castle Transmission Services (Holdings)
          Ltd, as Guarantors, and The Law Debenture Trust Corporation
          p.l.c., as Trustee, dated October 17, 1997.
   *4.6  --Specimen Certificate of Common Stock.
</TABLE>
<PAGE>
 
<TABLE>
<CAPTION>
 EXHIBIT
   NO.                              DESCRIPTION                            PAGE
 --------                           -----------                            ----
 <C>      <S>                                                              <C>
    *5.   --Opinion of Cravath, Swaine & Moore with respect to the
           legality of Common Stock.
  **10.1  --Registration Rights Agreement by and among Crown Castle
           International Corp. and Lehman Brothers Inc. and Credit
           Suisse First Boston Corporation dated as of November 25,
           1997.
  **10.2  --Loan Agreement by and among Castle Tower Corporation,
           KeyBank National Association (formerly known as "Society
           National Bank") and certain lenders dated April 26, 1995
           ("KeyBank Loan Agreement").
  **10.3  --First Amendment to KeyBank Loan Agreement dated June 26,
           1996.
  **10.4  --Second Amendment to KeyBank Loan Agreement dated January 17,
           1997.
  **10.5  --Third Amendment to KeyBank Loan Agreement dated April 3,
           1997.
  **10.6  --Fourth Amendment to KeyBank Loan Agreement dated October 31,
           1997.
  **10.7  --Fifth Amendment to KeyBank Loan Agreement dated November 24,
           1997.
  **10.8  --Amended and Restated Limited Holdco Guaranty by Crown Castle
           International Corp., in favor of KeyBank National
           Association, as Agent, dated November 25, 1997.
  **10.9  --Memorandum of Understanding regarding Management and
           Governance of Castle Tower Holding Corp. and Crown
           Communications, Inc. dated August 15, 1997.
 +**10.10 --Site Commitment Agreement between Nextel Communications,
           Inc. and Castle Tower Corporation dated July 11, 1997.
 +**10.11 --Independent Contractor Agreement by and between Crown
           Network Systems, Inc. and Sprint Spectrum L.P. dated July 8,
           1996, including addendum dated November 12, 1997.
 +**10.12 --Independent Contractor Agreement between Crown Network
           Systems, Inc. and Powerfone, Inc. d/b/a Nextel Communications
           dated September 30, 1996.
 +**10.13 --Independent Contractor Agreement by and between APT
           Pittsburgh Limited Partnership and Crown Network Systems,
           Inc. dated December 3, 1996.
 +**10.14 --Master Lease Agreement between Sprint Spectrum, L.P. and
           Robert Crown d/b/a/ Crown Communications dated June 11, 1996
           ("Sprint Master Lease Agreement").
    10.15 --First Amendment to Sprint Master Lease Agreement, dated July
           5, 1996 (included in Exhibit 10.14).
    10.16 --Second Amendment to Sprint Master Lease Agreement, dated
           January 27, 1997 (included in Exhibit 10.14).
 +**10.17 --Master Lease Agreement between Powerfone, Inc. d/b/a/ Nextel
           Communications and Robert A. Crown d/b/a Crown Communications
           dated October 3, 1996.
 +**10.18 --Master Lease Agreement between APT Pittsburgh Limited
           Partnership and Robert Crown d/b/a Crown Communications dated
           December 3, 1996.
 +**10.19 --Master Tower Lease Agreement between Cellco Partnership
           d/b/a/ Bell Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P. and
           Pennsylvania RSN No. 6 (II) and Robert A. Crown d/b/a/ Crown
           Communications dated December 29, 1995, as amended by a
           letter agreement dated as of October 28, 1997.
 +**10.20 --Master Tower Lease Agreement between Cellco Partnership
           d/b/a/ Bell Atlantic NYNEX Mobile, Pittsburgh SMSA, L.P. and
           Pennsylvania RSN No. 6 (II) and Robert A. Crown d/b/a/ Crown
           Communications dated December 29, 1995, as amended by a
           letter agreement dated as of October 28, 1997.
  **10.21 --Castle Tower Holding Corp. 1995 Stock Option Plan (Third
           Restatement).
  **10.22 --Services Agreement between Castle Transmission International
           Ltd (formerly known as Castle Transmission Services Ltd) and
           Castle Tower Holding Corp. dated February 28, 1997.
</TABLE>
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                              DESCRIPTION                            PAGE
 --------                           -----------                            ----
 <C>      <S>                                                              <C>
  **10.23 --Shareholders' Agreement among Berkshire Fund IV Investment
           Corp., Berkshire Investors LLC, Berkshire Partners LLC,
           Candover Investments PLC, Candover (Trustees) Limited,
           Candover Partners Limited (as general partner for 4 limited
           partnerships), Castle Tower Holding Corp., Telediffusion de
           France International S.A., and Diohold Limited (now known as
           Castle Transmission Services (Holdings) Ltd) dated January
           23, 1997.
  **10.24 --First Amendment to Amended and Restated Stockholders
           Agreement by and among Crown Castle International Corp.,
           Edward C. Hutcheson, Jr., Ted B. Miller, Jr., Robert A. Crown
           and Barbara Crown and the persons listed as Investors dated
           January 28, 1998.
  **10.25 --Third Amendment to Sprint Master Lease Agreement, dated
           February 12, 1998.
   *10.26 --Form of Stockholders Agreement between Crown Castle
           International Corp. and certain stockholders listed on
           Schedule 1 thereto.
   *10.27 --Agreement among Castle Transmission Services (Holdings)
           Ltd., Digital Future Investments B.V., Berkshire Partners LLC
           and certain shareholders of Castle Transmission Services
           (Holdings) Ltd. for the sale and purchase of certain shares
           of Castle Transmission Services (Holdings) Ltd., for the
           amendment of the Shareholders' Agreement in respect of Castle
           Transmission Services (Holdings) Ltd. and for the granting of
           certain options, dated April 24, 1998.
   *10.28 --Form of Governance Agreement among Crown Castle
           International Corp., Telediffusion de France International
           S.A. and Digital Future Investments B.V.
   *10.29 --CTI Operating Agreement.
   *10.30 --Form of Shareholders' Agreement among Crown Castle
           International Corp., Telediffusion de France International
           S.A. and Castle Transmission Services (Holdings) Ltd.
   *10.31 --Site Sharing Agreement between National Transcommunications
           Limited and The British Broadcasting Corporation dated
           September 10, 1991.
   +10.32 --Transmission Agreement between the British Broadcasting
           Corporation and Castle Transmission Services Limited dated
           February 27, 1997.
   +10.33 --Digital Terrestrial Television Transmission Agreement
           between the British Broadcasting Corporation and Castle
           Transmission International Ltd. dated February 10, 1998.
   +10.34 --Agreement for the Provision of Digital Terrestrial
           Television Distribution and Transmission Services between
           British Digital Broadcasting plc and Castle Transmission
           International Ltd. dated December 18, 1997.
   *10.35 --Loan Amendment Agreement among Castle Transmission
           International Ltd., Castle Transmission Services (Holdings)
           Ltd. and certain lenders dated May 21, 1997.
   *10.36 --First Amendment to 1995 Stock Option Plan dated April 1,
           1998.
   +10.37 --Contract between British Telecommunications PLC and Castle
           Transmission International Ltd. for the Provision of Digital
           Terrestrial Television Network Distribution Service dated May
           13, 1998.
   +10.38 --Site Marketing Agreement dated June 25, 1998 between
           BellSouth Mobility Inc. and Crown Communication Inc.
   *11    --Computation of net loss per common share.
   *21    --Subsidiaries of Crown Castle International Corp.
 ***23.1  --Consent of KPMG Peat Marwick LLP.
 ***23.2  --Consent of Ernst & Young LLP.
    23.3  --Consent of Cravath, Swaine & Moore (included in Exhibit 5).
</TABLE>    
<PAGE>
 
<TABLE>   
<CAPTION>
 EXHIBIT
   NO.                              DESCRIPTION                            PAGE
 --------                           -----------                            ----
 <C>      <S>                                                              <C>
  **24    --Powers of Attorney.
  **27.1  --Financial Data Schedule for the period ended December 31,
           1996.
  **27.2  --Financial Data Schedule for the period ended September 30,
           1997.
  **27.3  --Financial Data Schedule for the period ended December 31,
           1997.
   *27.4  --Financial Data Schedule for the period ended March 31, 1998.
 ***99.1  --Consent of Michel Azibert.
 ***99.2  --Consent of Bruno Chetaille.
 ***99.3  --Consent of William A. Murphy.
</TABLE>    
- --------
*  To be filed by amendment.
** Incorporated by reference to the exhibits with the corresponding exhibit
   numbers in the Registration Statement on Form S-4 previously filed by the
   Registrant (Registration no. 333-43873).
   
*** Previously filed.     
+  Indicates that portions of the exhibit have been omitted pursuant to a
   request for confidential treatment and such portions have been filed with
   the Commission separately.

<PAGE>
 
                                                                   EXHIBIT 10.32

                           DATED 27th FEBRUARY 1997



                   (1) THE BRITISH BROADCASTING CORPORATION

                                      and

                   (2) CASTLE TRANSMISSION SERVICES LIMITED



                            TRANSMISSION AGREEMENT

                                 HOME SERVICE



                              LINKLATERS & PAINES
                               Barrington House
                             59-67 Gresham Street
                                London EC2V 7JA

                              Tel: 0171-606 7080

                            Ref: RMDB/MSH                             C00018678
<PAGE>
 
<TABLE>
<CAPTION> 
     Contents
- ---------------------------------------------------------------------------------------
Clause Heading                                                                     Page
<S>                                                                                <C>
   1  Definitions................................................................   1
   2  Duration and Contract Management...........................................  19
   3  Services...................................................................  19
 3.1  Transmission of BBC's Programmes...........................................  19
 3.2  Other Services.............................................................  24
 3.3  Third Party Services.......................................................  30
 3.4  Control of the Services....................................................  30
 3.5  Monitoring at the Interface................................................  31
 3.6  Compliance with Site Sharing Agreements....................................  34
   4  BBC's Obligations..........................................................  34
 4.1  Operational Obligations....................................................  34
 4.2  Obtaining Consents/Licensing...............................................  36
 4.3  Use of the Services........................................................  37
 4.4  Payment....................................................................  38
 4.5  Access.....................................................................  40
 4.6  Maintenance of MBN Core Network and Other BBC Telecommunications Networks..  42
 4.7  Radio Frequency Planning Services..........................................  42
 4.8  Ownership of the Equipment.................................................  42
 4.9  Access to Records and Software.............................................  42
4.10  BBC Affiliates.............................................................  44
   5  Provision for Changes/Modifications........................................  44
</TABLE>

                                       i
<PAGE>
 
<TABLE>
<CAPTION> 
     Contents
- ---------------------------------------------------------------------------------------
Clause Heading                                                                     Page
<S>                                                                                <C>
 5.1  Changes by TxCo............................................................  44
 5.2  Changes requested by the BBC...............................................  48
 5.3  Modifications to this Agreement including Charges and Payment..............  49
   6  Engineering Performance Standards..........................................  50
 6.1  Maintenance of the Engineering Performance Standards.......................  50
 6.2  Compliance with the Engineering Performance Standards......................  50
   7  Performance Monitoring.....................................................  52
 7.1  Performance Database.......................................................  52
 7.2  Fault Reporting............................................................  52
 7.3  Performance Reporting......................................................  53
   8  Customer Complaints........................................................  54
   9  Licensing..................................................................  54
  10  Continuity of Provision of Services........................................  55
10.1  Routine Maintenance, Fault Repairs and Permitted Interruptions.............  55
10.2  Emergency Fault Repair.....................................................  57
10.3  Service Priorities.........................................................  58
  11  Review of Performance Requirements.........................................  59
  12  Charges, Payment and Billing...............................................  60
12.1  Charges and Payment for the Services.......................................  60
12.2  Invoices...................................................................  61
12.3  Interest on Late Payment...................................................  61
</TABLE>

                                      ii
<PAGE>
 
<TABLE>
<CAPTION> 
     Contents
- ---------------------------------------------------------------------------------------
Clause Heading                                                                     Page
<S>                                                                                <C>
12.4  Failure to Meet Service Obligations - Service Credits......................  62
12.5  Calculation of Service Credits.............................................  63
  13  Termination................................................................  64
13.1  The Services...............................................................  64
13.2  Force Majeure..............................................................  66
13.3  Emergency Services.........................................................  67
13.4  Termination for Breach.....................................................  68
13.5  Termination on Change in Control...........................................  68
13.6  Consequences of Termination................................................  74
13.7  Details of Relevant Employees..............................................  75
13.8  Transfer Regulations.......................................................  76
  14  Third Party Services.......................................................  80
  15  Warranties and Undertakings................................................  81
  16  Liability and Insurance....................................................  82
  17  Assignment and Sub-Contracting.............................................  88
  18  Force Majeure..............................................................  88
  19  Amendments to this Agreement...............................................  89
  20  Information and Confidentiality............................................  89
  21  Intellectual Property Rights...............................................  91
  22  Employees..................................................................  94
22.1  Terms of employment of existing Employees..................................  94
</TABLE>

                                      iii
<PAGE>
 
<TABLE>
<CAPTION> 
     Contents
- ---------------------------------------------------------------------------------------
Clause Heading                                                                     Page
<S>                                                                                <C>
22.2  Changes in numbers and total cost of Employees.............................  95
  23  Notices....................................................................  95
  24  Non-Solicitation...........................................................  97
  25  Restrictive Trade Practices................................................  97
  26  Whole Agreement............................................................  98
  27  Value Added Tax............................................................  98
  28  Parent Company Guarantee...................................................  99
  29  Jurisdiction...............................................................  99
</TABLE>

                                      iv
<PAGE>
 
THIS AGREEMENT is made the 27th day of February 1997 BETWEEN

(1)  THE BRITISH BROADCASTING CORPORATION, a corporation incorporated under
     Royal Charter, whose principal office is at Broadcasting House, Portland
     Place, London W1A 1AA ("the BBC"); and

(2)  CASTLE TRANSMISSION SERVICES LIMITED (registered number 3196207) whose main
     place of business is Warwick Technology Park, Heathcote Lane, Warwick CV34
     5DS ("TxCo")

WHEREAS

(A)  The BBC has vested in TxCo, whose registered office is at Barrington House,
     59-67 Gresham Street, London EC2V 7JA, substantially all of the assets of
     the BBC's Transmission division other than the part of the business known
     as World Service Transmission Operations.

(B)  TxCo owns pursuant to the Transfer Scheme and operates transmitting
     stations for wireless telegraphy and apparatus for the purposes of
     broadcasting, inter alia, throughout the United Kingdom, the Isle of Man
     and the Channel Islands.

(C)  The BBC is incorporated under the Charter and required under the Charter
     and Agreement  to provide radio and television broadcasts.

(D)  TxCo will hold the necessary licences under the WTA and the Telecoms Act to
     perform the Services contemplated by this Agreement.

(E)  The Services to be performed under this Agreement are substantially the
     same as the BBC's Transmission division has been performing pursuant to an
     existing intra-group trading arrangement up to the date on which the
     Transfer Scheme comes into force.

(F)  The parties do not consider that the arrangement set out in this Agreement
     is a new procurement but rather the formalization of an existing
     arrangement the duration of which is proportionate to the BBC's need for
     the continuity of existing arrangements to facilitate the vesting of TxCo.

IT IS HEREBY AGREED AS FOLLOWS:

                                       1
<PAGE>
 
1.   DEFINITIONS

     In this Agreement:

     "ACCEPTED" in relation to the DAB Services and the DAB Construction
     Services shall mean acceptance by the BBC of a Station in accordance with
     the agreed acceptance specification and the DAB Project Plan set out in
     Schedule 1.1

     "ACCOUNTABLE FAULT" means a fault of the kind defined in Schedule 5 Part 4.

     "AFFILIATE" means any undertaking in respect of which a participating
     interest is held by TxCo, the BBC or another subsidiary undertaking of the
     BBC, or its parent undertaking or any subsidiary undertaking of its parent
     undertaking (as such terms are defined in sections 258 to 260 and Schedule
     9 of the Companies Act 1985, as amended by the Companies Act 1989).

     "AGREEMENT" means the Agreement between the Secretary of State and the BBC
     dated 25 January 1996.

     "AMS" means the Automatic Messaging Service.

     "ANCILLARY ACCOMMODATION" means Deferred Facilities comprising buildings,
     which are both ancillary accommodation and DF Assets, and the equipment in
     such buildings, which are BBC DF.

     "ANCILLARY SERVICES" means all vertical blanking interval ("VBI") services,
     such as the existing teletext service, Audetel, subtitling and Signal-3,
     VBI talk back, radio data services and DAB programme-associated data and
     any other similar services provided by the BBC from time to time.

     "AUTOMATIC FAULT REPORTING EQUIPMENT" means equipment located at Stations
     which monitors the status of other equipment, including, but not limited
     to, whether transmitters are operating at reduced power, and sends data
     back to the TOC allowing it to monitor remotely the status of the
     transmitter.

     "AVERAGE EARNINGS INDEX" means the average earnings index for the whole
     United Kingdom economy as published from time to time by the Office of
     National Statistics or, if such index shall cease to be published or if
     there is a material change in the basis of the index, such other average
     earnings index as is an equivalent replacement, or if there is not a
     replacement, as the BBC may, after consultation with TxCo, reasonably
     determine to be appropriate in the circumstances.
                                      
                                       2
<PAGE>
 
     "1996 ACT" means the Broadcasting Act 1996.

     "BBC ASSIGNEE" means any wholly owned subsidiary of the BBC to whom the BBC
     has assigned this Agreement pursuant to Clause 17.2.

     "BBC DF" means any equipment or structures or circuits owned or rented by
     the BBC and used for the purposes of providing DF Services.

     "BBC EQUIPMENT" means any equipment at the TxCo Sites (not being TxCo
     Equipment) owned by or leased to the BBC including, but not limited to,
     radio car base equipment, OB equipment and the test DTT multiplexers, or
     equipment run by a third party used by the BBC or any provider of services
     to the BBC, including any BBC Nominated Contractor in relation to the
     Services which Equipment is included in a Site Sharing Agreement with the
     BBC or excluded from transfer to TxCo in the Transfer Scheme.

     "BBC NOMINATED CONTRACTOR" means a contractor engaged by the BBC who is
     from time to time permitted access by TxCo to the Stations to install,
     maintain, repair and replace BBC Equipment including BBC DF.

     "BBC'S PROGRAMMES" means any national radio and television services,
     regional broadcasting services, local radio services, Teletext and other
     ancillary services (including any Emergency Announcements) provided by the
     BBC consisting of programmes and ancillary material intended for
     transmission by wireless telegraphy and made by or on behalf of the BBC in
     accordance with the terms of the Charter and Agreement.

     "BBC REPRESENTATIVE" means a person or persons nominated in writing to TxCo
     by the BBC from time to time to be its contractual point of contact, in
     accordance with the notice provisions of this Agreement.

     "BBC SHARED EQUIPMENT" means any equipment, other than TxCo Equipment, at a
     BBC Site which is also used by TxCo or other BBC Equipment to which TxCo
     has access pursuant to a Site Sharing Agreement.

     "BBC SITE" means any property owned, or occupied under lease or license, by
     the BBC, other than properties leased or licensed to the BBC by TxCo
     pursuant to a Site Sharing Agreement.

     "BILLING INFORMATION" means the information to accompany TxCo's invoiced
     Charges to the BBC for the Services including the information set out, and
     in the form described, in Schedule 2.

                                       3
<PAGE>
 
     "BROADCAST DUTY MANAGER" means the radio presentation manager, the current
     radio Operational Point of Contact.

     "BROADCASTING ACT" means the Broadcasting Act 1990.

     "BT" means British Telecommunications pic.

     "CHARGES" means the charges payable from time to time by the BBC to TxCo
     for the Services and under any Site Sharing Agreements calculated in
     accordance with Schedules 2 and 7.

     "CHARTER" means the Charter granted to the BBC by Her Majesty the Queen in
     Council on 13 March 1996.

     "CHARTER AND AGREEMENT" means the Charter granted tot he BBC by Her Majesty
     the Queen in Council on 13 March 1996 and the Agreement between the
     Secretary of State and the BBC dated 25 January 1996 both of which came
     into force on 1 May 1996, as such Charter and Agreement may from time to
     time be amended or replaced.

     "COMMENCEMENT DATE" means the date on which the Transfer Scheme comes into
     effect.

     "DAB CONSTRUCTION SERVICES" means the provisions of services as set out in
     Schedule 1, which services relate to the installation by TxCo of digital
     audio broadcasting facilities to 27 transmitter sites.

     "DAB MULTIPLEX" means the system by which the DAB Services are conveyed
     from their point of origin to the listeners' receiving apparatus.

     "DAB SERVICES" means the transmission by wireless telegraphy of a
     multiplexed signal which contains a range of BBC audio and data services.

     "DEFERRED FACILITIES" means the assets owned by TxCo and the BBC and used
     in providing the DF Services as set out in Schedule 9, as that Schedule may
     be amended from time to time.

     "DF ASSETS" means those assets owned by TxCo and listed in Schedule 9 from
     time to time and used in providing the DF Services.

     "DF SERVICES" means the services described in Schedule 9 to be performed by
     TxCo.

     "DF STATIONS" means the Sites at which the Deferred Facilities described in
     Schedule 9 are located.

                                       4
<PAGE>
 
     "DF TRANSMITTED SERVICES" means the services transmitted using the Deferred
     Facilities, which Services form part of the DF Services.

     "DUTY ENGINEER" means the person of that title from time to time on duty at
     the TOC.

     "EFFECTIVE RADIATED POWER" in a given direction, means the measure which is
     the product of the power supplied to an antenna and its gain in that
     direction relative to a half-wave dipole.

     "EMERGENCY ANNOUNCEMENTS" means the provision by the BBC as required by
     Clause 8.1 of the Agreement of announcements or other matter from all or
     any of the Stations.

     "EMERGENCY POWERS" means a power exercisable by a Minister of the Crown
     pursuant to any legislation enacted or made to deal with a public emergency
     including the Emergency Powers Act 1920 and any regulations made under it.

     "EMERGENCY SERVICES" means the services described in Clause 3.2.4,
     including the Transmission Network being taken over pursuant to any
     direction by the Secretary of State or any other Minister of the Crown and
     used for Her Majesty's Service.  The Emergency Services include the DF
     Transmitted Services.

     "EMPLOYEES" means the employees of TxCo (or any sub-contractor of TxCo)
     from time to time principally employed for the purposes of performing
     TxCo's obligations under this Agreement or the employees of any TxCo
     Assignee from time to time principally employed for the purposes of
     performing TxCo's obligations under this Agreement.

     "ENERGIS" means Energis Communications Limited.

     "ENGINEERING PERFORMANCE STANDARDS" means the technical performance
     parameters to be applied by TxCo in its performance of the Services as set
     out in Schedule 4.

     "FORCE MAJEURE EVENT" means any events or circumstances beyond the
     reasonable control of the defaulting party which shall include but not be
     limited to Act of God, war, civil disturbance, statutory prohibition,
     Government intervention, order or act of Government or local/public
     authority, acts of terrorism, fire, lightning, flood, adverse propagation
     conditions, and any other adverse weather conditions, explosion, accident,
     theft or vandalism, national strike action or industrial action taken by a
     union or interruption caused by a third party station owner or the BBC
     provided that neither party can rely on strikes, industrial action, theft
     or acts of vandalism where it

                                       5
<PAGE>
 
     could reasonably have been expected to have prevented them or the
     industrial action or strike is by its own employees only.

     "GENERAL SERVICES AGREEMENT " means the agreement of even date between the
     parties to this Agreement;

     "HMG" means any Minister of the Crown and/or government department,
     including the Cabinet Office, or the nominated representative of any of
     them.

     "HOME OFFICE" means such government department as carries out the
     governmental functions relevant to the DF Services referred to in this
     Agreement from time to time, as the context permits, and which is currently
     headed by the Secretary of State for the Home Office.

     "INDEX" or "RPI" means the general retail price index (all items) as
     published in the monthly Digest of Statistics by the UK Office of National
     Statistics, as amended from time to time, or any equivalent replacement.

     "INSERTION TEST SIGNAL" means a test signal, as defined in the BBC R&D
     Technical Memorandum S1199(91), inserted into the vertical blanking
     interval of a television signal.

     "INTERFACE" means the network termination points between the BBC's
     distribution and contribution systems and the Transmission Network for each
     of Network Television, Network Radio and Regional Broadcasting as set out
     in Schedule 3.

     "LF RADIO DATA" means radio data on low frequency transmissions.

     "LOCAL RADIO" means regional radio services other than national radio
     services.

     "LOSSES" means all losses, liabilities, costs (including without limitation
     legal costs), expenses and damages.

     "MANAGED BROADCAST CORE NETWORK" means the distribution and contribution
     network provided to the BBC by Energis (including circuits sub-contracted
     from BT) and used to carry part of the signals comprising the BBC's
     Programmes to and from the source of the BBC Programmes and the Interface,
     including for the purposes of this Agreement all SHF Circuits and OB inject
     points retained by the BBC.  The Managed Broadcast Core Network excludes
     the Self Provided Network.

                                       6
<PAGE>
 
     "MAINTENANCE SERVICES" means:

          (i)   the maintenance of radio car base equipment, OB inject points
                and SHF Circuits as set out in Schedule 1 para 2; and

          (ii)  maintenance of contribution circuits comprised in the Self
                Provided Network.
    
     "MINIMUM PERIOD" means the period from the Commencement Date until 31 March
     2007.

     "MONITORING SERVICES" means the monitoring by TxCo of the Transmission
     Network and the Self Provided Network.

     "NETWORK MANAGEMENT CENTRE" means the unit within the BBC to be established
     to monitor the Managed Broadcast Core Network, the BBC's internal
     telecommunications networks and IT infrastructure.

     "NETWORK RADIO SERVICES" means broadcast transmission services for BBC
     Network Radio programmes including programmes broadcast on the channels
     known as Radios 1, 2, 3, 4 and 5 Live and DAB Services and any broadcast
     data services using the frequencies reserved for Radios 1, 2, 3, 4 and 5
     Live and DAB.

     "NETWORK TELEVISION SERVICES" means broadcast transmission services for the
     transmission of BBC1 and BBC2 network television programmes and other
     programmes (including Ceefax) provided by the BBC and using the same
     frequencies as BBC1 and BBC2.

     "NEW SERVICES" means the new services which the BBC requests TxCo to
     undertake as agreed, such as new UHF or MF transmitters or FM fillers, DAB
     Phase 2, DTT and new RDS equipment.  Once a new service is agreed between
     the parties it shall become a New Service from that time.

     "NEWS" means the News directorate of the BBC.

     "NEW STATIONS" means additional and replacement Stations, whether on an
     existing or new site installed by TxCo pursuant to this Agreement or the
     General Services Agreement.

     "NICAM STEREO" means a digital stereo sound service broadcast as part of
     the BBC1 and BBC2 signal from some Stations.

     "NTL" means National Transcommunications Limited.

     "NTL AGREEMENT" means the master Site Sharing Agreement of 10 September
     1991 between the BBC and NTL which will be transferred to TxCo pursuant to
     the Transfer Scheme.

                                       7
<PAGE>
 
     "NTL SITES" means all sites owned by, leased or licensed to NTL and dealt
     with under the NTL Agreement.
  
     "OB" means outside broadcast.

     "OPERATIONAL POINT OF CONTACT" for television means the Presentation
     Engineering Co-ordinator, for network radio the Broadcast Duty Manager and
     for regional radio the Head of Production Services or such other post as is
     notified to TxCo by the BBC from time to time in writing in accordance with
     the provisions of this Agreement.  The Operational Point of Contact will be
     available on a 24 hour a day basis, unless the Operational Point of Contact
     is responsible only for regional radio.

     "OPERATOR" means the BBC and/or any Successor Operator.

     "PERFORMANCE DATABASE" means the database used for calculating Performance
     Measures, maintained and supported by the TOC.

     "PERFORMANCE MEASURES" means the numerical indications of TxCo's overall
     performance, calculated as set out in Schedule 10 part 1.

     "PERFORMANCE STANDARDS" means the overall performance parameters to be
     applied by TxCo in its performance of the Transmission Service as set out
     in Schedule 10.

     "PLANNED INTERRUPTIONS" means any interruptions of the kind described in
     Clauses 10.1.1 and 10.1.2.

     "PLANNED WORK MESSAGE" means a message sent using the AMS where there is a
     Planned Interruption to the Transmission Service or periods of reduced
     power working.

     "PRESENTATION ENGINEERING CO-ORDINATOR" means the engineer on duty at
     Television Centre of that title or any replacement engineer designated by
     the BBC in accordance with the notice provisions of this Agreement, the
     current television Operational Point of Contact.

     "PRIORITY STATIONS" means those stations described as Priority Stations in
     Schedule 3 part 1 as amended from time to time.

     "PROPOSED SALE AGREEMENT" means the agreement for the proposed disposal by
     the BBC of all of its interest in TxCo.

                                       8
<PAGE>
 
     "PTO" means a telecommunications operator designated as a public
     telecommunications operator under the Telecoms Act.

     "R&D SERVICES AGREEMENT" means the call-off agreement of even date between
     TxCo and the BBC's Research & Development department relating to services
     to be supplied to TxCo by the BBC such as service planning, testing,
     technical consultancy for HF/UHF control systems, development of digital
     audio broadcasting technology, digital terrestrial television technology
     and services to be provided by TxCo to the BBC such as advice on the
     construction and equipping of New and existing Stations and the provision
     of facilities for testing equipment.

     "RDS" means radio data service, included with the signal of Network and
     Regional Radio.

     "RF" means radio frequency.

     "RADIO REGULATIONS" means the Radio Regulations of the International
     Telecommunications Union or any replacement for such regulations and
     includes all related regional agreements.

     "RADIO SERVICE PLANNING NOTE" means the partial requirement specification
     for a radio transmitting station, containing all details except the antenna
     radiation patterns.

     "RADIO STATION DESIGN PROPOSAL" mans the supplement to the Radio Service
     Planning Note containing the antenna radiation patterns.

     "REGION" means the national and English regions of the BBC, being Northern
     Ireland, Wales, Scotland, Northern England, the Midlands and East England,
     and Southern England.

     "REGIONAL BROADCASTING SERVICES" means broadcast transmission services of
     the BBC comprising Regional Radio and Television programmes using the same
     frequencies as Network Television and Network Radio and those of Regional
     Radio.

     "REGIONAL RADIO" means each of the local and national radio stations listed
     below:

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------
REGION                                 RADIO STATION                          LOCATION
===========================================================================================
<S>                                    <C>                                    <C>
Scotland                               Radio Scotland                         Glasgow
___________________________________________________________________________________________ 
Scotland                               BBC Radio Nan Gaidheal                 Isle of Lewis
___________________________________________________________________________________________ 
Scotland                               BBC Radio Orkney                       Orkney
___________________________________________________________________________________________ 
Scotland                               BBC Radio Shetland                     Shetland
___________________________________________________________________________________________ 
Northern Ireland                       Radio Ulster                           Belfast
___________________________________________________________________________________________ 
Northern Ireland                       Radio Foyle                            Londonderry
___________________________________________________________________________________________
</TABLE> 

                                       9
<PAGE>
 
<TABLE>
<S>                                    <C>                                    <C>  
_________________________________________________________________________________________________________
Wales                                  Radio Wales                            Cardiff
_________________________________________________________________________________________________________
Wales                                  Radio Cymru                            Cardiff
_________________________________________________________________________________________________________
England (South)                        BBC Radio Bristol                      Bristol
_________________________________________________________________________________________________________
England (South)                        BBC Somerset Sound                     Bristol
_________________________________________________________________________________________________________
England (South)                        BBC Radio Gloucestershire              Gloucester
_________________________________________________________________________________________________________
England (South)                        BBC Wiltshire Sound                    Swindon
_________________________________________________________________________________________________________
England (South)                        BBC Radio Devon                        Plymouth
_________________________________________________________________________________________________________
England (South)                        BBC Radio Cornwall                     Cornwall
_________________________________________________________________________________________________________
England (South)                        BBC Radio Guernsey                     Guernsey
_________________________________________________________________________________________________________
England (South)                        BBC Radio Jersey                       Jersey
_________________________________________________________________________________________________________
England (South)                        BBC Radio Solent                       Southampton
_________________________________________________________________________________________________________
England (South)                        Southern Counties Radio                Guildford
_________________________________________________________________________________________________________
England (South)                        Greater London Radio                   London
_________________________________________________________________________________________________________
England (South)                        BBC Thames Valley FM                   Oxford
_________________________________________________________________________________________________________
England (South)                        BBC Radio Kent                         Kent
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio West Midlands                Birmingham
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Stoke                        Stoke-on-Trent
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Shropshire                   Shrewsbury
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio CWR                          Coventry
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Hereford & Worcester         Worcester
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Nottingham                   Nottingham
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Leicester                    Leicester
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Derby                        Derby
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Lincolnshire                 Lincoln
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Norfolk                      Norfolk
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Cambridgeshire               Cambridge
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Suffolk                      Ipswich
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Radio Northampton                  Northampton
_________________________________________________________________________________________________________
England (Midlands & East)              Three Counties Radio                   Luton
_________________________________________________________________________________________________________
England (Midlands & East)              BBC Essex                              Chelmsford
_________________________________________________________________________________________________________
England (North)                        Greater Manchester Radio               Manchester
_________________________________________________________________________________________________________
England (North)                        BBC Radio Lancashire                   Blackburn
_________________________________________________________________________________________________________
England (North)                        BBC Radio Merseyside                   Liverpool
_________________________________________________________________________________________________________ 
England (North)                        BBC Radio Leeds                        Leeds
_________________________________________________________________________________________________________ 
</TABLE> 
                                      10
<PAGE>
 
<TABLE> 
<CAPTION> 
<S>                                    <C>                                    <C>  
- ---------------------------------------------------------------------------------------------------------
England (North)                        BBC Radio Sheffield                    Sheffield
_________________________________________________________________________________________________________ 
England (North)                        BBC Radio York                         York
_________________________________________________________________________________________________________ 
England (North)                        BBC Radio Humberside                   Hull
_________________________________________________________________________________________________________ 
England (North)                        BBC Radio Newcastle                    Newcastle upon Tyne
_________________________________________________________________________________________________________ 
England (North)                        BBC Radio Cleveland                    Middlesborough
_________________________________________________________________________________________________________ 
England (North)                        BBC Radio Cumbria                      Carlisle
- --------------------------------------------------------------------------------------------------------_
</TABLE>

     "RELEVANT EMPLOYEES" means all Employees employed immediately before the
     Transfer Date (whether employed by TxCo or otherwise) whose contract of
     employment has been or is to be transferred to the BBC or, as the case may
     be, a Successor Operator by virtue of the operation of law (including the
     Transfer Regulations) or any other person so employed in respect of whom
     liabilities arising from a contract of employment or employment
     relationship have or will be transferred by virtue of the operation of law
     (including the Transfer Regulations). 

     "RELEVANT EMPLOYER" means an employer of any of the Employees or the
     Relevant Employees. 

     "REVIEW COMMITTEE" means the committee described in Clause 11.

     "ROUTINE MAINTENANCE" means work that is planned by TxCo to minimize faults
     on either TxCo Equipment or BBC Equipment (if such Equipment is required by
     the BBC to be maintained by TxCo under this Agreement) and to ensure that
     such Equipment operates safely, complies with all applicable statutory
     requirements and meets the Engineering Performance Standards.

     "THE SECRETARY OF STATE" means one of Her Majesty's Principal Secretaries
     of State. 

     "SELF PROVIDED NETWORK" or
     
     "SPN" means the microwave links owned from time to time by TxCo and used by
     it as part of the Transmission Network. 

     "THE SERVICE AREA" means the current service areas of Stations as
     identified and held by the BBC's Research & Development department.

     "THE SERVICES" means, either collectively or individually as appropriate,
     the Network Television Services, the Network Radio Services, the Regional
     Broadcasting Services, the Ancillary Services, the Emergency Services, the
     Monitoring Services, the Maintenance Services, the DF Transmitted Services,
     the DF Services, the DAB Construction Services and any New Services agreed
     to be provided by TxCo by terrestrial wireless telegraphy transmission to
     the BBC.

                                      11
<PAGE>
 
     "SERVICE CREDITS" means credits against Charges in respect of TxCo failing
     to meet the relevant Performance Measure in accordance with Clause 12.4.

     "SERVICE MESSAGE" means a message of the kind described in Schedule 5 part
     5.2.

     "SHF CIRCUITS" means the remotely controlled antennas, transmitters and
     receivers owned by the BBC and used by the BBC for contribution, including
     circuits used for OB and electronic newsgathering.

     "SHARED TELECOMMUNICATIONS AGREEMENT" means the agreement of even date
     between TxCo and the BBC relating to TxCo's use of the BBC's internal
     telecommunications networks. 

     "SITE SHARING AGREEMENT" means the agreement between TxCo and the BBC in
     the form set out in Schedule 6 relating to TxCo's access, use and
     occupation of BBC Sites, an agreement in the form set out in Schedule 9
     Annex 2 making provision for access, use and occupation of each relevant
     WSCo Site or TxCo Site by the BBC or TxCo for Deferred Facilities, and an
     agreement in the form set out in Schedule 7 for each relevant TxCo Site for
     BBC's access, occupation and use in relation to BBC Equipment shared
     equipment or otherwise.

     "STATIONS" means the wireless telegraphy stations (including related
     equipment) listed in Annex 1.

     "SUCCESSOR OPERATOR" means a contractor succeeding TxCo in the provision or
     operation of all or any of the Services.

     "TALK AGREEMENT" means the agreement of 28 March 1995 between the BBC and
     Talk Radio UK Limited.

     "TARGET PERFORMANCE MEASURE" means the Performance Measure which is
     required for each of BBC1, BBC2, Radio 2, Radio 3, Radio 4 FM, Radio 4 MF,
     Radio 5 Live, DAB and Regional, National and Local Radio.

     "TELECOMS ACT" means, in relation to the UK, the Telecommunications Act
     1984 or such equivalent statutes as are from time to time in force in the
     Channel Islands or the Isle of Man.

     "TELETEXT" means Ceefax or any other data service transmitted using lines
     in the vertical blanking interval of the vision element of the television
     signal directed to the general public.

     "TELESWITCHING AGREEMENT" means the agreement of even date between 
     TxCo and the BBC relating, inter alia, to performance of the contract 
     of 9 February 1996 between the BBC and the

                                      12
<PAGE>
 
     Electricity Association and the contract of 21 July 1994 between the BBC
     and the Norfolk County Council.

     "TELETEXT EQUIPMENT" means the teletext equipment owned by TxCo installed
     at Stations used to enhance the provision of Teletext as such equipment is
     more particularly described in Schedule 12 para 4.

     "TELEVISION SERVICE PLANNING NOTE" means the full requirement specification
     for a television transmitting Station.

     "TERM" means the term of this Agreement set out in Clause 2.2, subject to
     earlier termination in accordance with Clause 13.

     "TOC" means the Technical Operations Centre operated and maintained by TxCo
     at Warwick including the back-up centre at Sutton Coldfield or such other
     site or sites to which it may be moved.

     "TRANSFER DATE" means close of business on the date when this Agreement
     terminates.

     "TRANSFER REGULATIONS" means the Transfer of Undertakings (Protection of
     Employment) Regulations 1981.
     
     "TRANSFER SCHEME" means the transfer scheme to be made by the BBC in favour
     of TxCo pursuant to the 1996 Act.

     "TRANSMISSION FAULTS" means such breaks, discontinuances or other
     impairments of the radiation of the BBC's Programmes as are related solely
     to one or more faults in the Transmission Network which shall include Major
     Faults and Minor Faults as defined in Schedule 5, Part 4.

     "TRANSMISSION NETWORK" means all or such part of the transmission system
     operated and/or provided by TxCo (including the Stations listed in Annex 1
     as that list may be amended from time to time in accordance with this
     Agreement), the transmission apparatus installed at the TxCo Sites from
     time to time (including the TxCo Equipment) and the Self Provided Network,
     in each case used to provide the Transmission Service.

     "TRANSMISSION SERVICE" means the transmission by terrestrial wireless
     telegraphy of the BBC's Programmes on the frequencies and at the power
     described in Annex 1 from the Stations by means of the Transmission Network
     in accordance with the Engineering Performance Standards.

                                      13
<PAGE>
 
     "TXCO ASSIGNEE" means any person, firm or company to whom TxCo has assigned
     this Agreement pursuant to Clause 17.2.

     "TXCO EQUIPMENT" means any apparatus or equipment other than BBC Equipment
     used by TxCo to provide the Transmission Service to the BBC from time to
     time under the terms of this Agreement, including but not limited to, all
     apparatus and equipment transferred to TxCo under the Transfer Scheme and
     also including any New Stations or transmitters and additional equipment
     required for this purpose from time to time and TxCo-owned equipment on BBC
     Sites.

     "TXCO LICENCES" means the Telecoms Act licences held by TxCo which
     authorise the provision by TxCo of the Services and the WTA licences held
     by TxCo which authorises use and installation of wireless telegraphy
     equipment.

     "TXCO REPRESENTATIVE" means a person or persons nominated in writing from
     time to time by TxCo to the BBC to be TxCo's contract representative.

     "TXCO SITE" means any property owned, or occupied under lease or licence,
     by TxCo, other than pursuant to a Site Sharing Agreement entered into
     pursuant to this Agreement.

     "TXCO SUB-CONTRACTOR" has the meaning given in Clause 13.8.2.

     "VAT" means value added tax as currently charged under the Value Added Tax
     Act 1994 and any successor or replacement thereof and any similar tax
     chargeable under the laws of the United Kingdom or any other jurisdiction.

     "VIRGIN AGREEMENT" means the agreement dated 26 November 1992 between the
     BBC and Independent Music Radio Limited, now known as Virgin Radio Limited.

     "WSCO" means the company into which the assets relating to the transmission
     of BBC World Service radio transmission are to be vested pursuant to the
     1996 Act.

     "WSCO EQUIPMENT" means equipment owned, or to be owned, by WSCo.

     "WSCO SITE" means any property owned, or occupied under lease or licence,
     by WSCo, other than a lease or licence granted by TxCo.

     "WTA" means the Wireless Telegraphy Acts 1949-1967 and any amendments to
     such Acts and any other legislation of equivalent effect in force from time
     to time in the Channel Islands or the Isle of Man.

                                      14
<PAGE>
 
     "YEAR" means the period from the Commencement Date to 31 March 1997 (which
     constitutes the first Year), and each subsequent complete period of twelve
     months, or in respect of the second Year the period beginning on 1 April
     1997 and concluding on 31 March 1998 and each subsequent Year beginning on
     1 April.

1.1  The expressions "the BBC" and "TxCo" include their respective permitted
     assigns, employees and agents.

1.2  Other than in Clause 13.5, any reference to any Act of Parliament will be
     deemed to include any replacement or re-enactment for the time being in
     force and to include any by-laws, statutory instruments, licences, rules,
     regulations, orders, notices, directions, consents or permissions made
     under such Act and any condition attaching thereto.

1.3  The headings in this Agreement are for ease of reference only and will not
     be taken into account in the construction or interpretation of any
     provision to which they refer.

1.4  The invalidity or unenforceability of any individual provision(s) of this
     Agreement shall not affect any other provision herein or render this
     Agreement invalid or unenforceable.

1.5  This Agreement is made between principals and it shall not be deemed to
     create any partnership between the parties and neither shall hold itself
     out as agent or partner of the other except as specifically contemplated
     under this Agreement.

1.6  In the event of any inconsistency between the general provisions of this
     Agreement and any of the provisions contained in any of the Schedules and
     Annexes to this Agreement the provisions of this Agreement shall take
     precedence.

1.7  Failure by either party to exercise any right conferred by this Agreement
     will not be deemed to be a waiver of any such right nor operate so as to
     bar the exercise or enforcement thereof or of any right on any other
     occasion.

1.8  Except to the extent that the context otherwise requires, words and
     expressions defined in Article 1 of the Radio Regulations shall have the
     same meanings in this Agreement.

  2. DURATION AND CONTRACT MANAGEMENT

2.1  The operation of this Agreement shall be kept under continuous review by
     the parties, including the regular meetings provided for in Clauses 3.2.7
     and 11 below.  The provisions as to payments under all Site Sharing
     Agreements between the parties shall be reviewed no later than 31

                                      15
<PAGE>
 
     December 2001 and if the NTL Agreement is amended, or amounts payable under
     it changed, in any material respect prior to that date, such review shall
     take place within three (3) months of that amendment having been made.

2.2  This Agreement will be deemed to have come into force on the Commencement
     Date and, subject to Clause 13, shall continue in force until either party
     gives to the other not less than 12 months' prior written notice of
     termination expiring at the end of any Year on or after the end of the
     Minimum Period ("the Term").

2.3  Whilst TxCo shall have no rights to apply the BBC's name to any goods, or
     use it in relation to any services without the prior written permission of
     the BBC, TxCo shall have the right  to state that it provides transmission
     and other services to the BBC in accordance with this and other agreements
     and to represent itself as a successor to part of the BBC's business.

  3. SERVICES

3.1  TRANSMISSION OF BBC'S PROGRAMMES

     3.1.1  Subject to Clause 3.1.5, TxCo shall provide the Network Radio
            Services, the Network Television Services, the Regional Broadcasting
            Services and the DAB Services and, subject to Clause 3.1.5 shall
            transmit the BBC's Programmes in the form in which such signals are
            received at the Interfaces from the Managed Broadcast Network or
            otherwise as indicated in this Agreement on the frequencies and at
            the power level set out in Annex 1 for the Term. TxCo shall ensure
            that it does not unreasonably operate any Station at reduced power.
            In transmitting the BBC's Programmes TxCo shall use the Stations and
            provide the Services as a free to air terrestrial broadcast service,
            that being the manner it currently provides the Services. Such
            Services shall comprise the Transmission Service.

            (i)   Subject to Clause 12.4, in particular, TxCo will ensure that
                  the Transmission Service:

                  (a)  conforms to the Engineering Performance Standards;

                  (b)  is performed in accordance with the standard of care to
                       be expected of a provider of radio and television
                       broadcast transmission services.

                                      16
<PAGE>
 
            (ii)       TxCo will repair or otherwise attend to all Transmission
                       Faults as soon as practicable, but in any event in
                       accordance with Schedule 5, Part 5.

            (iii)      Failure to comply with the obligations described in (i)
                       and (ii) above may entitle the BBC to recover Service
                       Credits in accordance with the provisions of Clause 12.4.

3.1.2       TxCo shall not be liable for failure to provide the Transmission
            Service:

            (i)        in respect of any failure or degradation of the signal or
                       message comprising the BBC's Programmes which arises
                       during transmission from the source of the BBC's
                       Programmes' signals to the Interface ;

            (ii)       (except as provided in (i) above) where it is temporarily
                       unable to provide all or part of the Transmission Service
                       due to a Force Majeure Event;

            (iii)      where any of the Transmission Network is requisitioned,
                       taken over or used pursuant to Clause 8 of the Charter
                       and Agreement, any Emergency Powers, including for the
                       making of Emergency Announcements, the performance of
                       Emergency Services or use of the Deferred Facilities or
                       pursuant to any direction under section 94 of the
                       Telecoms Act.

3.1.3       TxCo shall maintain the Re Broadcast Standby (RBS) facilities which
            were in place on the Commencement Date, as listed in Schedule 12,
            Part 1. These facilities shall continue to be available to provide
            the BBC's Programmes as far as they comprise Network Radio and
            Network Television Programmes which TxCo will automatically select
            on failure of the normal source of the BBC's Programmes. The quality
            of signals provided by the RBS facilities shall be determined by the
            practical limitations of each facility and TxCo shall not be
            required to ensure that these facilities meet the Engineering
            Performance Standards. RBS facilities are intended only to provide a
            usable source of the BBC's Network Television Programmes and Network
            Radio Programmes, where feasible, in order to avoid total loss of
            signal. TxCo shall not be required to ensure that RBS facilities
            will provide usable sources at all times. TxCo shall not be required
            to ensure that usable signals are radiated if a major failure of the
            normal distribution network operated by the BBC to the Interface
            results in programme distribution passing through a chain of several
            TxCo RBS facilities.

                                      17
<PAGE>
 
     3.1.4  The permitted use of the contribution circuits comprised in Self
            Provided Network (listed in Schedule 12, Part 5) shall be limited to
            use by TxCo for the performance of this Agreement and not the
            provision of any other third party service without the prior written
            consent of the BBC (which consent may, in the BBC's discretion, be
            granted subject to the negotiation of any necessary modifications to
            this Agreement (including modifications to the charges). For the
            avoidance of doubt, the BBC requires immediate access to the Self
            Provided Network contribution circuits on demand 24 hours a day, 365
            days a year (or 366 days in a leap year).

            The performance and availability limits for the Self Provided
            Network contribution circuits shall be those applying at the
            Transfer Date as set out in the Managed Broadcast Network handbook.

     3.1.5  TxCo hereby undertakes not to interfere with, modify or adjust in
            any way the BBC's Programmes or in any other way affect the BBC's
            editorial control of its Programmes whether before or after their
            transmission through the Transmission Network, other than:

            (i)    as is necessary to process the signals for the purposes of
                   transmission by the transmitters comprised in the
                   Transmission Network;

            (ii)   where automatic protection systems are in place; or

            (iii)  as directed by the BBC in writing.

            TxCo may also interfere with, modify or adjust such signal where
            necessary in order to comply with the Engineering Performance
            Standards subject in any such case to the agreement of the
            Operational Point of Contact prior to carrying out any such
            interference, modification or adjustment at a Priority Station. To
            the extent that the BBC does not agree to the interference,
            modification or adjustment, or delays the time at which it may take
            place, TxCo shall not be liable for Service Credits. TxCo may
            interfere with, modify or adjust such signals at Stations, other
            than Priority Stations, subject to immediately notifying the BBC's
            Operational Point of Contact as soon as it has carried out such
            interference, modification or adjustment. It may also replace the
            signal if requested by the Operational Point of Contact with an
            alternative source of the BBC's Programmes.

                                      18
<PAGE>
 
     3.1.6  The BBC may from time to time during the Term request that TxCo
            either: 

            (i)   adjusts the operating frequency or power output of the
                  transmitters at one or more of the Stations; or

            (ii)  provides the Transmission Services by the use of New Stations
                  in the United Kingdom, the Channel Islands or the Isle of Man
                  (including in accordance with the General Services Agreement),

                  and TxCo agrees that it shall use all reasonable endeavours to
                  do so in accordance with the provisions of this Agreement
                  subject to any necessary adjustments to the Engineering
                  Performance Standards, the Charges, any other relevant parts
                  of this Agreement and subject to any of the TxCo Licences and
                  subject to the BBC providing TxCo with information as to the
                  population/location to be served by any New Station or
                  transmitter operating at a different frequency or power and
                  any other information reasonably required by TxCo.

     3.1.7  All negotiations required to agree any amendments needed to this
            Agreement, including amendments to accommodate any such New Stations
            or any adjustment to operating frequencies or power output or to
            adjust the Engineering Performance Standards or Charges shall be
            conducted in good faith by both parties.

3.2  OTHER SERVICES

     3.2.1  MONITORING SERVICES

            (i)   TxCo shall monitor 24 hours per day 365 days per year (or 366
                  days in a Leap Year) the Transmission Network using Automatic
                  Fault Reporting Equipment at the locations where they
                  currently exist. The present locations of Automatic Fault
                  Reporting Equipment are listed in Schedule 1, Part 3. Changes
                  in location or the provision of additional Automatic Fault
                  Reporting Equipment will be subject to an amendment in the
                  Charges. The remaining sites which transmit the BBC's
                  Programmes shall be monitored on an ad hoc basis by members of
                  the public who volunteer to assist. TxCo will use its
                  reasonable endeavours to establish and maintain such contacts.

            (ii)  As part of its Monitoring Services TxCo will notify the BBC
                  whenever it is aware of a Transmission Fault, whether by
                  reason of Automatic Fault Reporting Equipment

                                      19
<PAGE>
 
                  or otherwise notified to it.  TxCo will, whenever it is
                  practicable to do so, inform the BBC of the likely duration
                  of such Transmission Fault and of the steps being taken to 
                  rectify it.

            (iii) TxCo shall report to the Operational Point of Contact and, if
                  requested in writing by the BBC, the Network Management
                  Centre, all material faults of which it is aware which occur
                  on all PTO-provided broadcast circuits which distribute the
                  signals comprising the BBC's Programmes to the Interface.

3.2.2       DF SERVICES

            TxCo's obligations in relation to Deferred Facilities and the
            provision of DF Services shall be as set out in Schedule 9.

3.2.3       MAINTENANCE SERVICES

            TxCo's obligations in relation to the maintenance of BBC Equipment
            shall be as set out in Schedule 1, Part 2. To the extent necessary
            to perform the Maintenance Services, the BBC will procure access to
            any premises TxCo does not otherwise have access to.

3.2.4       EMERGENCY SERVICES

            (i)   In the event that the BBC notifies TxCo that the BBC's
                  Programmes include any Emergency Announcements, TxCo will
                  transmit such Emergency Announcements from all Stations
                  notified to it by the BBC, using, where required, the Self
                  Provided Network and the TxCo Equipment, notwithstanding any
                  planned or routine maintenance relating to such Stations, and
                  to halt, to the extent that it would otherwise prevent the
                  transmission of such Emergency Announcements, any emergency
                  fault repair. In the event that the BBC notifies TxCo that it
                  has been requested by the Secretary of State to refrain from
                  broadcasting or transmitting any matter or class of matter,
                  the BBC will prevent such matter from being sent to the
                  Interface. The BBC will pay all of TxCo's reasonable costs of
                  performance of the Emergency Services, including, but not
                  limited to, all costs related to powering up TxCo's
                  generators, unless such costs are covered by any payment to
                  TxCo by Her Majesty's Government.

            (ii)  The BBC will act as required, requested or directed by the
                  Secretary of State, any Minister of Her Majesty's Government,
                  the Home Office or the Channel Islands' authorities in
                  providing any Emergency Announcement, requiring the cessation
                  of

                                      20
<PAGE>
 
                  any transmission or taking possession of any of the Stations
                  other than on NTL Sites or any TxCo Equipment. The BBC agrees
                  to use its reasonable endeavors to provide as much notice as
                  possible of any requirements for an Emergency Announcement or
                  any of the Emergency Services, including DF Transmitted
                  Services. Subject to the terms of any direction given to TxCo
                  by Her Majesty's Government, the BBC and TxCo will work
                  together when required by the BBC to plan the procedures for
                  transmitting Emergency Announcements, at the BBC's cost, such
                  cost to be agreed prior to such planning work being
                  undertaken. In the event of any dispute between TxCo and the
                  BBC, acting on behalf of the Secretary of State, any Minister,
                  the Home Office or the Channel Islands' authorities, the
                  requirements of the BBC shall prevail.

            (iii) In the event that the Secretary of State, or any Minister of
                  the Crown, or official of the Secretary of State authorized to
                  act on his or her behalf, has concluded that an emergency has
                  arisen as contemplated by Clause 8.3 of the Agreement, then
                  TxCo agrees to permit the Secretary of State to exercise her
                  or his powers to take control of the transmission of the BBC's
                  Programmes or any of them or to do any of the other acts
                  contemplated by Clause 8.3 of the Agreement. The Secretary of
                  State or her or his nominee may enter any premises or sites
                  owned, leased or occupied by TxCo other than NTL Sites (unless
                  an order or direction is made by Her Majesty's Government
                  requiring this) in exercise of Emergency Powers and use all
                  TxCo equipment located at such premises or sites and may use
                  any spectrum licensed to TxCo for the BBC's Programmes under
                  its WTA Licenses. The BBC may act on behalf of the Secretary
                  of State in this regard. In the event that the powers of the
                  Secretary of State or any Minister of the Crown, or any
                  official of the Secretary of State authorized to act on his or
                  her behalf are invoked under this sub-clause (iii), the BBC
                  shall be responsible for the reimbursement of any operating
                  costs occasioned by the exercise of the powers and to make
                  good any loss or damage to any TxCo Equipment or other
                  equipment on TxCo Sites. The BBC shall not be liable in such
                  circumstances to make any other payment to TxCo.

            (iv)  Any provision of any Emergency Services or an Emergency
                  Announcement, either at the request of the BBC or pursuant to
                  any Emergency Powers, shall not constitute a 

                                       21
<PAGE>
 
            breach of any other requirements of this Agreement and shall
            not be a breach of any of the Engineering Performance
            Standards or otherwise give rise to an obligation on TxCo to
            make any payment or give any Service Credits to the BBC.

3.2.5       NEW SERVICES

            If the BBC requires any new services it will have the right to go
            out to tender for such services. TxCo shall, if eligible in
            accordance with the relevant procurement rules and if invited by the
            BBC, have the right to reply within the prescribed timescale to any
            invitation to tender. Subject to TxCo's eligibility in accordance
            with the relevant procurement rules, the BBC must invite TxCo to
            tender for any work involving an extension to existing Services, and
            also for future phases of DAB and for digital terrestrial
            television. The terms for the implementation of any New Services
            will be agreed between the parties should TxCo be awarded any
            contracts for New Services by the BBC in accordance with the
            tendering procedure. The New Services will not include any of the
            Services referred to under the General Services Agreement. Any New
            Services comprising only the construction and operation of New
            Stations requested by the BBC will, unless otherwise agreed, be
            charged for in accordance with Schedule 2 para 9.

3.2.6       SPECTRUM MANAGEMENT

            (i)   In the event that the Radiocommunications Agency wishes to
                  change any of the frequencies set out in Annex 1, or a New
                  Station or a new service requires changes to the use of the
                  spectrum currently licensed to TxCo, the BBC and TxCo will
                  discuss the required changes and TxCo agrees to implement them
                  in the most expeditious and cost-effective manner possible,
                  having regard to the BBC's requirements as set out in this
                  Agreement. TxCo and the BBC will agree on any necessary
                  changes to the Engineering Performance Standards and the
                  Charges (and any other relevant parts of this Agreement) and
                  Schedule 4 and Annex 1 shall be amended accordingly. The BBC
                  agrees to pay TxCo's costs of any work required in assessing
                  any changes required by the Radiocommunications Agency and
                  their implementation.

            (ii)  TxCo agrees at the request of the BBC and/or the
                  Radiocommunications Agency to investigate at its own cost any
                  instances of Interference which may be connected to the
                  Stations or the performance of the Transmission Services. In
                  the

                                      22
<PAGE>
 
                  event that the instances of Interference are as a result of
                  changes authorised or requested by or acts or omissions of the
                  BBC, the BBC will meet TxCo's reasonable costs of so doing in
                  accordance with the daily man rates set out in Schedule 2.

3.2.7       CONTRACT MANAGEMENT

            (i)   The BBC Representative and the TxCo Representative will meet
                  once every 3 months, or more frequently at the reasonable
                  request of either party, to discuss the provision of the
                  Services. Such meetings shall be minuted and copies of such
                  minutes circulated to both parties. Any complaints or problems
                  relating to the provision of the Services of an engineering or
                  technical nature which cannot be satisfactorily resolved by
                  the BBC Representative and the TxCo Representative will be
                  escalated as set out below.

            (ii)  The parties will ensure that, for the BBC, either the Deputy
                  Director General or the Director of Policy and Planning, and
                  for TxCo, the Chief Executive Officer, will meet together with
                  a view to resolving the dispute. The parties will allow 30
                  days from the date of escalation of the dispute under Clause
                  3.2.7(i) above for such consultation or discussions to take
                  place before initiating any arbitration or other legal
                  proceedings.

            (iii) Thereafter either party shall have the right to refer the
                  matter for adjudication to the President for the time being of
                  the Institution of Electrical Engineers, or his nominee. The
                  President or his nominee shall act as an expert, not an
                  arbitrator. The party referring any matter for adjudication
                  must deliver to the expert and the other party a notice
                  setting out the matters in dispute and any relevant supporting
                  evidence. The other party shall be entitled to reply to the
                  notice and such evidence, delivering such reply to the expert
                  and the party referring the matter. Otherwise, the expert
                  shall be entitled to decide on the procedure he or she wishes
                  to adopt. Any determination of the expert must be in writing
                  and shall be final and binding on both parties failing any
                  manifest error on the face of the decision. Unless the expert
                  determines otherwise, both parties will bear their own costs
                  of the determination.

            (iv)  As an alternative to adjudication, or in relation to matters
                  not of an engineering or technical nature, a dispute may be
                  referred to the Review Committee set up under Clause 11 below.

                                      23
<PAGE>
 
            3.3   THIRD PARTY SERVICES
   
                  Nothing in this Agreement shall be construed as preventing
                  TxCo from using the TxCo Sites and the Stations, or any of its
                  other assets including DF Assets (other than Ancillary
                  Accommodation and BBC DF) and TxCo Equipment at BBC sites, to
                  perform services for third parties subject always to its
                  obligations to the BBC under this Agreement and any Site
                  Sharing Agreement. TxCo shall be entitled to retain all income
                  it derives from such third party services. When any DF Assets
                  are used by TxCo, other than in performance of the DF
                  Transmitted Services, TxCo shall ensure that it complies with
                  Schedule 9 and that any Deferred Facilities so used are in the
                  SA condition and level of functionality subject to fair wear
                  and tear as before such use and that the use does not
                  prejudice the priority use of them that the BBC requires in an
                  emergency.

            3.4   CONTROL OF THE SERVICES

                  Subject to Clause 3.2.7, in respect of the day-to-day
                  performance of each part of the Service TxCo will deal solely
                  with the Operational Point of Contact. Copies of all
                  correspondence including electronic correspondence between
                  TxCo and the Operational Point of Contact, shall also be sent
                  at the same time to the BBC Representative. In relation to the
                  performance of the Transmission Service, TxCo will have no
                  editorial control in relation to the BBC's Programmes and any
                  changes made to their transmission in the event of a Force
                  Majeure Event Transmission Fault shall be the responsibility
                  of the BBC unless the BBC gives instructions to TxCo to make
                  specified changes to the BBC's Programmes to circumvent the
                  Force Majeure Event or the Transmission Fault which TxCo shall
                  fail to make. In respect of the performance of the DF
                  Transmitted Services in the case of a national emergency, to
                  the extent to which it is able, the BBC will inform TxCo of
                  the arrangements for controlling the Transmission Services.

            3.5   MONITORING AT THE INTERFACE
          
                  The following arrangements shall apply with respect to the
                  monitoring, reporting and resolution faults at each type of
                  Interface. 

                  3.5.1 MBN CORE INTERFACES FOR TELEVISION SERVICES AT TXCO
                  SITES

                  Where there is existing Automatic Fault Reporting Equipment
                  and vision parameter measuring equipment, TxCo shall remotely
                  monitor the quality of the analog television signal comprising
                  the BBC's Programmes at the Interface with the MBN TxCo Sites,
                  using that equipment. If the quality, as indicated by the
                  Insertion Test Signal, falls below the limits set out in
                  Schedule 4 para 1, then TxCo shall report this fault to the
                  BBC's Operational Point of Contact who will be responsible for
                  procuring

                                      24
<PAGE>
 
          restoration of the signal at the Interface to the specified quality
          set out in Schedule 4 para 1 in the column numbered 1.

          3.5.2  SELF PROVIDED NETWORK INTERFACES AT BBC SITES FOR TELEVISION
                 SERVICES

                 No quality monitoring of the TV signal will be provided at the
                 input to the Self Provided Network where this is located at a
                 BBC Site. In this situation TxCo shall remotely monitor the
                 quality of the output of the Self Provided Network at TxCo
                 Sites. The monitoring will be by the use of existing Automatic
                 Fault Reporting Equipment and vision parameter measuring
                 equipment. If the quality of the signal at this point, as
                 measured using the Insertion Test Signals, falls below the
                 levels specified in Schedule 4 para 1 in the column numbered 1,
                 then TxCo will report this to the BBC's Operational Point of
                 Contact who shall then take all reasonably practicable steps to
                 ensure that the quality of the TV signal comprising the BBC's
                 Programmes at the Interface meets the quality specified in
                 Schedule 4 para 1 in the column numbered 1. If, so far as can
                 be reasonably ascertained, the quality of that signal at the
                 Interface is satisfactory, then TxCo agrees to despatch a
                 maintenance engineer to identify the cause of the fault and to
                 restore service so that it complies with the Engineering
                 Performance Standards. If requested to do so, the BBC's
                 Operational Point of Contact will arrange for TxCo staff to be
                 given emergency access to TxCo Equipment at the relevant BBC
                 Site.

          3.5.3  MBN CORE NETWORK INTERFACE FOR RADIO SIGNALS AT TXCO SITES

                 The quality of the multiplexed bitstream comprising such of the
                 BBC's Programmes as are radio programmes delivered by the MBN
                 to the Interface will be monitored where it is currently
                 monitored by reference to the error rate of the multiplexed
                 bitstream by TxCo, TxCo will notify the Operational Point of
                 Contact and the Network Management Centre (when established) of
                 any faults. Action will be taken by the BBC's Operational Point
                 of Contact, or the Network Management Centre, following
                 notification by TxCo if the performance falls below the error
                 rate set out in Schedule 4 para 2.7.

          3.5.4  SELF PROVIDED NETWORK INTERFACE FOR RADIO SIGNALS AT BBC SITES

                 The obligations of both TxCo and the BBC for the monitoring of
                 radio signals comprising part of the BBC's Programmes delivered
                 to the Interface with the Self Provided Network at BBC Sites
                 shall be as set out in Clause 3.5.2 above, except that the
                 signal will be a digital bitstream at the Interface point and
                 the quality of the bitstream will be remotely monitored where
                 it is currently monitored at the relevant

                                      25
<PAGE>
 
                 TxCo Sites, and may be monitored at the relevant BBC Site, in
                 each case in accordance with Clause 3.5.3 above. Any faults
                 will be reported to the operational Point of Contact.

          3.5.5  INTERFACE TO 1500 MHZ DIGITAL RADIO LINKS BETWEEN LOCAL RADIO
                 STUDIOS AND LOCAL RADIO TRANSMITTERS

                 The arrangements for monitoring at the Interface such of the
                 BBC's Programmes as comprise Local Radio will be as set out in
                 Clause 3.5.4 above but TxCo shall continue remotely to monitor
                 the presence or otherwise of that signal at the output of the
                 links connecting to the Interface, using supervisory tones, if
                 it does so currently. Any faults will be reported to the
                 Operational Point of Contact.

          3.5.6  PTO CIRCUIT ANALOGUE INTERFACES FOR RADIO SERVICES AT TXCO
                 SITES

                 Arrangements for the monitoring at the Interface comprising, on
                 the BBC side, PTO provided analog circuits such of the BBC's
                 Programmes as comprise Local, Regional and National Radio shall
                 be the same as set out in Clause 3.5.1 above, except that only
                 the presence or otherwise of the circuit will be monitored, by
                 use of supervisory tones or other electronic means as set out
                 in Schedule 4 para 7. In addition to reporting any faults to
                 the Operational Point of Contact, faults shall also be reported
                 to the Network Management Centre, when established.

     3.6  COMPLIANCE WITH SITE SHARING AGREEMENTS

          TxCo agrees to comply with all Site Sharing Agreements with the BBC as
          required by Clause 4.5.1 below. In the event of any inconsistency
          between any of the Site Sharing Agreements and the terms of this
          Agreement, this Agreement shall prevail.

4    BBC'S OBLIGATIONS

     4.1  OPERATIONAL OBLIGATIONS

          4.1.1  The BBC shall supply the BBC's Programmes to TxCo in any form
                 the BBC sees fit at each relevant part of the Interface for
                 transmission from the Interface in the form in which the BBC
                 currently de livers the BBC's Programmes, unless otherwise
                 agreed; provided that the form in which the BBC supplies the
                         --------        
                 BBC's Programmes to TxCo at each relevant part of the Interface
                 is such form as permits TxCo to transmit those Programmes in
                 the form in which Tx Co currently transmits them, and; further
                                                                        -------
                 provided, that TxCo does not change the equipment directly
                 --------
                 connected to the Interface without

                                      26
<PAGE>
 
                 the BBC's agreement. The Interface will not be changed without
                 the agreement of both parties.

          4.1.2  In the event of interruption or degradation to the signal
                 carrying the BBC's Programmes occurring prior to receipt of the
                 BBC's Programmes at the Interface the onus shall be upon the
                 BBC to establish and remedy the cause. For the avoidance of
                 doubt, TxCo shall not be held to be in breach of any of its
                 obligations under this Agreement as a result of interruption or
                 deterioration in the quality of transmission of the BBC's
                 Programmes in such circumstances unless that interruption or
                 degradation is as a direct result of the breach by TxCo of any
                 of its obligations under this Agreement. Notwithstanding the
                 above, TxCo will immediately notify the BBC's Operational Point
                 of Contact where such signal interruption or degradation comes
                 to its notice or is identified pursuant to Clause 3.5 or 7.2
                 and shall provide all assistance reasonably required by the
                 BBC, at the BBC's expense, in accordance with the daily man
                 rates set out in Schedule 2.

          4.1.3  If a Transmission Fault is identified by either party that
                 party shall immediately pass details of the fault to the Duty
                 Engineer and the Operational Point of Contact. The cost of
                 identifying Transmission Faults shall be borne by the BBC, if
                 the Transmission Fault is with BBC Equipment, and by TxCo if
                 the Transmission Fault is with TxCo Equipment.

          4.1.4  The BBC will ensure that the MBN Core Network, or such other
                 means of delivery of the signals comprising the BBC's
                 Programmes to the Interface as is used by it from time to time,
                 is regularly inspected and maintained as necessary, including
                 replacement of worn parts and repair of faults.

          4.1.5  The BBC agrees to monitor the MBN Core Network and any 
                 other PTO provided broadcast circuits.

     4.2  OBTAINING CONSENTS/LICENSING

          Without prejudice to any other provision of this Agreement, the BBC
          will use its reasonable endeavours to obtain and comply at its cost
          with any permission, license, consent, registration and approval
          necessary or reasonably considered desirable by TxCo (including
          without limitation any necessary approval under the Charter and
          Agreement, the 1996 Act and/or the Broadcasting Act) for:

                                      27
<PAGE>
 
          4.2.1     provision of the Services and any New Services, including
                    any access required to the BBC's Sites, excluding any
                    planning and building consents required for all Sites other
                    than BBC Sites. The BBC can request TxCo to apply for such
                    planning and building consents, subject to TxCo being
                    reimbursed for its costs in doing so;

          4.2.2     installation and maintenance of the BBC Equipment, the MBN
                    Core Network, any other PTO-provided broadcast circuits used
                    by it to deliver signals, comprising the BBC's Programmes,
                    to the Interface or for contribution purposes, the provision
                    of the Super High Frequency (SHF) OB Links and any other
                    means used for transmission of the BBC's Programmes to the
                    Interface;

          4.2.3     connection of the BBC DF, the SHIF OB Links, other equipment
                    and any circuits used to deliver the BBC's Programmes to the
                    Interface to TxCo Equipment or the Transmission Network; and

          4.2.4     subject to Clause 3.2.6(ii) above, compliance with any
                    obligation in the Charter and Agreement to investigate
                    instances of Interference notified to it by the
                    Radiocommunications Agency. The BBC will inform TxCo of all
                    such notifications relating to the Transmission Network.

     4.3  USE OF THE SERVICES

          4.3.1     The BBC will supply the BBC's Programmes in accordance with
                    this Agreement and such reasonable additional operating
                    instructions as may be notified in writing or orally (and
                    confirmed in writing) to the BBC by TxCo from time to time
                    which are necessary to permit TxCo to comply with the
                    relevant provisions of the WTA or the Telecoms Act and any
                    other licence which governs the running of the Transmission
                    Network.

          4.3.2     Without limitation to the generality of Clause 4.3.1, the
                    BBC will not knowingly permit the BBC's Programmes to
                    contain any material:

                    (i)  which is defamatory, offensive or abusive or of an
                         obscene or menacing character; or

                    (ii) which constitutes a violation or infringement of the
                         rights of any person (including but not limited to all
                         intellectual property rights such as moral rights,
                         rights of copyright or confidentiality) or infringement
                         of any law.

                                      28
<PAGE>
 
          4.3.3     The BBC will indemnify TxCo against all Losses in any
                    jurisdiction arising out of or in any way connected with the
                    matters referred to in Clause 4.3.2.

          4.3.4     TxCo shall not be liable to the BBC in the event that a
                    pirated signal is injected to any of the Stations and
                    transmitted from them or if any Station picks up off air
                    signals not licensed for broadcasting in the UK and re-
                    transmits such signals. TxCo agrees that if it becomes aware
                    of the injection of any pirated signal it will reasonably
                    promptly inform each of the BBC and the Radiocommunications
                    Agency and will cooperate with any reasonable request of the
                    Radiocommunications Agency concerning that pirated signal.
                    TxCo will also use all reasonable efforts to minimize the
                    risk of pirated signals being injected to any of the
                    Stations but shall not be obliged to take any additional
                    action or measures to those currently taken.

          4.3.5     The BBC shall permit TxCo to use its telecommunications
                    networks for the AMS and its Automatic Fault Reporting
                    Equipment and to use the BBC's internal telephone network in
                    accordance with the Shared Telecommunications Agreement.

     4.4  PAYMENT

          4.4.1     The BBC shall pay to TxCo during the term of this Agreement
                    the Charges in respect of each of the Services and pursuant
                    to the Site Sharing Agreements, less any Service Credits
                    calculated under Clause 12.4.1 together with all license
                    fees payable under the TxCo Licenses, in accordance with the
                    provisions of Schedule 2 and for the avoidance of doubt the
                    BBC shall be directly responsible for the following payments
                    in addition to the Charges:

                    (i)    the charges for installing and connecting the BBC DF
                           to TxCo's Equipment at the Stations as set out in
                           Schedule 9; and

                    (ii)   charges referred to in 3.3, 3.4 and 7 of Schedule 2;
                           and

                    (iii)  the charges for the New Stations referred to in the
                           General Services Agreement, calculated in accordance
                           with Schedule 2 paras 8 and 9 of Schedule 2; and

                    (iv)   all costs (whether direct or indirect) of
                           transmission of, the BBC's Programmes to the
                           Interface, and

                    (v)    amounts payable by reason of any changes that are
                           made to this Agreement in accordance with its terms.

                                      29
<PAGE>
 
          4.4.2     TxCo agrees to provide the BBC promptly with copies of all
                    correspondence it receives from the Radiocommunications
                    Agency relating to license fees for the WTA licence held by
                    it for performance of the Transmission Services (or any
                    successor body with the same responsibilities as that
                    agency). The BBC agrees that it will not exercise its rights
                    under this Clause 4.4.2 in any manner which would jeopardise
                    the standing or existence of TxCo's WTA licenses.

          4.4.3     For the avoidance of doubt, in the event that the list of
                    Stations is amended during the Term the BBC agrees to pay
                    any adjusted Charges, ascertained in accordance with the
                    relevant provisions of Clause 5, other than TxCo-initiated
                    changes, unless the BBC agrees, on a case by case basis, to
                    pay such Charges in respect of TxCo-initiated chances.

          4.4.4     The parties confirm and agree that if the BBC wishes to
                    amend the list of Stations to include a non-TxCo-owned
                    Station, additional provisions will need to be agreed
                    between the parties whereby TxCo enters into a
                    lease/licensing agreement with the station owner permitting
                    access to such station and enabling TxCo to provide the
                    Services (insofar as it is lawful and able to do so) on
                    behalf of the BBC, and that the Charges will need to be
                    modified accordingly.

     4.5  ACCESS

          4.5.1     The BBC shall, where required in relation to the DF Services
                    and the SHF Circuits and OB inject points and the other BBC
                    Equipment, comply with the relevant Site Sharing Agreement
                    with TxCo in respect of each of the relevant Stations on or
                    before the date of this Agreement. It is agreed that no such
                    Site Sharing Agreement shall create the relationship of
                    landlord and tenant between the BBC and TxCo.

          4.5.2     Subject to the provisions of Clauses 3.2.4, 4.5.4 and
                    Schedule 9 and to the terms in which TxCo is in occupation
                    of any of the Priority Stations, the BBC or the BBC's
                    Nominated Contractor(s) shall be permitted access to each of
                    the Priority Stations at least once per annum per Station
                    and to other Stations at other reasonable times having
                    regard to the availability of TxCo resources by prior notice
                    and by arrangement with TxCo for the purpose of conducting
                    routine checks of The Transmission Network in order to
                    ascertain whether it is meeting the Engineering Performance
                    Standards. Where access is sought by the BBC or the BBC's
                    Nominated Contractor(s) seeking to rectify

                                      30
<PAGE>
 
                    any faults to the BBC DF, BBC Equipment and BBC Shared
                    Equipment, TxCo shall make access available to the relevant
                    Station as soon as reasonable in the circumstances and in
                    accordance with the provisions of the relevant Site Sharing
                    Agreement.

          4.5.3     Where the BBC, or the BBC's Nominated Contractor(s) on
                    behalf of the BBC, exercises its rights to access to the
                    Stations, as provided in Clause 4.5.2 above, TxCo may
                    require that the BBC or the BBC's Nominated Contractor is
                    accompanied by one appropriate member of TxCo staff and TxCo
                    shall be entitled to recover as an additional charge from
                    the BBC the costs and expenses of such attendance,
                    calculated as a daily rate for any day or part of a day, at
                    the relevant Station, except when the access is required to
                    test whether the Transmission Network has met the
                    Engineering Performance Standards having previously failed
                    to meet such Standards in the previous twelve (12) months,
                    in which case the relevant costs shall be for TxCo. Such
                    daily rate shall be as set out in Schedule 2 subject to
                    annual review to reflect any increase in the staff, charges
                    subject to a cap equivalent to the variation in the Index in
                    the previous year. Such charges shall be in addition to and
                    not form part of the Charges but will be included in the
                    Billing Information.

          4.5.4     The BBC shall comply with TxCo's regulations as notified to
                    it from time to time when entering onto and performing work
                    on TxCo's Sites and shall procure that the BBC's Nominated
                    Contractor shall do the same. The BBC shall reimburse TxCo
                    for any damage, Loss or expense which it may suffer or incur
                    as a result of the BBC's (or its Nominated Contractor's)
                    access to any of TxCo's Sites pursuant to this Clause 4.5.

     4.6  MAINTENANCE OF MBN CORE NETWORK AND OTHER BBC TELECOMMUNICATIONS
          NETWORKS

          The BBC agrees to give TxCo as much notice as possible in the
          circumstances of any planned or urgent maintenance of, and any
          alterations made to the MBN Core Network and any other BBC
          telecommunications network used by TxCo, which may affect TxCo. If the
          BBC is unable to give such notice it shall not be in breach of this
          Agreement and TxCo will in any event be relieved of any liability for
          failure to perform to the extent such failure is directly attributable
          to its inability to use either the MBN Core Network or any BBC
          telecommunications network because of any such maintenance or
          alterations.

                                      31
<PAGE>
 
     4.7  RADIO FREQUENCY PLANNING SERVICES

          The BBC agrees to make available to TxCo, in accordance with the R&D
          Services Agreement, the services of the service planning section of
          its Research and Development department.

     4.8  OWNERSHIP OF THE EQUIPMENT

          The BBC will not remove or alter in any way any identification mark on
          any part of the TxCo Equipment showing that it is owned by TxCo. TxCo
          will not be obliged to remove the BBC logo from any equipment to which
          it is permanently affixed which has become TxCo Equipment.

     4.9  ACCESS TO RECORDS AND SOFTWARE

          4.9.1     The BBC will have a reasonable right of access on reasonable
                    notice to any specifications or diagrams of any of the
                    current TxCo Equipment and the current Stations which are in
                    the possession or control of TxCo and can legally be
                    supplied.

          4.9.2     In addition, the BBC has the right to audit any records on
                    which the Billing Information is based or which relate to
                    power consumption of the Stations or to the costs of
                    provision of the DAB Services or by the construction and
                    operation of any New Stations itself or by an independent
                    auditor (whose identity shall be reasonably approved by
                    TxCo), subject to the BBC's agreement to keep such records
                    confidential and not to use them for any other purpose. Such
                    audit may be conducted by the BBC or on the BBC's behalf by
                    an independent auditor, not more than twice in each year of
                    this Agreement and at the BBC's cost. In the event that such
                    audit reveals any discrepancy in any Billing Information or
                    in the Charges the BBC and TxCo agree to rectify such
                    discrepancy as soon as practicable. If TxCo disagrees on the
                    existence of a discrepancy then the matter shall be referred
                    to the Contract Review Committee without prejudice to TxCo's
                    other rights. In the event that any audit reveals
                    overpayment by the BBC of more than 10% of the Charges or
                    other amounts payable in any year of this Agreement, TxCo
                    shall be responsible for all direct costs of the BBC's
                    audit.

          4.9.3     TxCo agrees to provide to the BBC a copy of the source code
                    and executable code of any software used to generate the
                    monthly performance review report referred to in Clause
                    7.3.1 and to license such software to the BBC. TxCo will not
                    charge the BBC for either the licence or the copy of the
                    software. 

                                      32
<PAGE>
 
          4.9.4     TxCo agrees to notify the BBC of all changes it makes to
                    such software and, if required by the BBC and at the BBC's
                    cost, to license any modified software to the BBC, such
                    licence to include both source code and executable code.

          4.9.5     The BBC agrees that such software shall be conclusive as
                    between it and TxCo for measuring performance pursuant to
                    this Agreement, unless otherwise agreed in writing.

     4.10 BBC AFFILIATES

          The BBC may permit its Affiliates to use the Services provided that
          this use does not constitute a breach of TxCo's Licenses or of the
          Talk or Virgin Agreements, subject to giving TxCo written notice a
          reasonable period of time prior to such use and TxCo confirming within
          a reasonable period of receipt that such use would not constitute a
          breach of any TxCo Licence or any contractual commitment of TxCo. The
          BBC will be responsible for any use by its Affiliates.

5    PROVISION FOR CHANGES/MODIFICATIONS

     5.1  CHANGES BY TXCO

          5.1.1     Subject to 5.1.5 below, TxCo shall not make any changes to
                    the Transmission Network or make any changes to the
                    configuration or height of any TxCo Equipment or to the
                    effective radiated power at any Station without the BDC's
                    prior written consent, such consent not to be unreasonably
                    withheld and to be given or refused within 30 days of a
                    request. Failure to respond within that period shall be
                    treated as assent on the part of the BBC, unless the parties
                    agree to an extension of time for consideration by the BBC
                    of the request. TxCo shall be entitled to add third party
                    equipment to any mast or tower provided it does not cause
                    interference to any TxCo Equipment or BBC Equipment.

          5.1.2     Notwithstanding Clause 5.1.1 above, TxCo shall be entitled
                    to replace the TxCo Equipment (excluding antennas or parts
                    of antennas) with equipment of equivalent functionality (or
                    improved functionality) without prior written consent from
                    the BBC.

          5.1.3     Subject to the provisions of the NTL Agreement, if TxCo
                    requests changes which affect an antenna configuration or an
                    antenna or part of an antenna at a Priority Station, TxCo
                    must demonstrate, at TxCo's cost, no loss in performance by
                    measuring field strength and calculating from this the
                    effective radiated power of the transmitter(s), in a manner
                    to be agreed with the BBC, prior to commencement of work and
                    by repeating the measurement on completion. In the event the
                    comparison indicates a loss in

                                      33
<PAGE>
 
                    performance and/or if there are significant viewer or
                    listener complaints, TxCo will take any necessary action to
                    correct the loss and to deal with the complaints and repeat
                    the field strength measurements to demonstrate compliance
                    with the pre-work measured performance. If, notwithstanding
                    any work to be under-taken by TxCo, there is for any other
                    reason a change in the reception of the signal transmitted
                    from the Station, TxCo agrees to investigate all such
                    problems and where appropriate to take necessary action at
                    TxCo's cost. For the avoidance of doubt, TxCo shall not be
                    obliged to undertake any work on any viewer's or listener's
                    apparatus in any circumstances. TxCo will provide, at its
                    own cost, to the BBC Representative both sets of effective
                    radiated power calculations. In addition, TxCo will provide
                    the BBC with a copy of all new antenna specifications
                    showing all the intended radiaticn patterns of the antennas.

          5.1.4     If TxCo has requested changes which affect antenna
                    configuration or an antenna or part of an antenna at a
                    Station which is not a Priority Station, if the BBC
                    reasonably requests it to do so, TxCo will following
                    implementation of the changes measure the field strength and
                    calculate from this the effective radiated power of the
                    transmitter(s), in a manner to be agreed with the BBC, at
                    the BBC's cost. If the effective radiated power so
                    calculated is significantly different from the original
                    requirement as documented in the Television Service Planning
                    Note or the Radio Service Planning Note, supplemented by the
                    Radio Station Design Proposal, as appropriate, TxCo, at its
                    own cost, will replace or modify the antenna to ensure that
                    the effective radiated power does conform in operation to
                    that specification and refund any amounts paid by the BBC
                    under this Clause. In addition, TxCo will provide the BBC
                    with a copy of all new antenna specifications, showing the
                    intended radiation patterns of the antenna.

          5.1.5     The BBC's consent under Clause 5 shall not be required
                    where:

                    (i)   TxCo is the tenant or licensee of the Site on which a
                          Station is located and its lease or license expires or
                          is otherwise terminated for grounds other than breach
                          by TxCo and either TxCo is unable to re-negotiate a
                          renewal on terms which it considers to be reasonable
                          terms or the BBC is unwilling to pay any increased
                          costs or charges which have been sought from TxCo; or

                    (ii)  closure of a Station is necessitated by a Force
                          Majeure Event; or

                                      34
<PAGE>
 
                    (iii)  closure is required, either on a temporary or a
                           permanent basis, by reason of road building or other
                           civil works carried out by a government or public
                           sector body or any other person acting under a
                           concession granted by a government or a public sector
                           body; or

                    (iv)   if the change is required by law, any national or
                           supranational regulatory authority, the Radio
                           Regulations, the Talk or Virgin Agreements, or any
                           statutory obligations, in such circumstances, the
                           parties agree to make all necessary consequential
                           amendments to this Agreement, including any necessary
                           amendments to a Site Sharing Agreement, or the
                           entering into of a further Site Sharing Agreement in
                           relation to the BBC's Equipment, on similar terms to
                           the existing Site Sharing Agreement.


                    5.1.6  In making any changes in accordance with this Clause
                           5, TxCo will have regard to the BBC's programme
                           scheduling requirements and give the BBC's
                           Representative as much written notice as reasonably
                           practicable, with sufficient details of any proposed
                           changes.

                    5.1.7  TxCo will inform the BBC Representative of any means
                           of which it is aware from time to time to improve the
                           reception of the BBC's Programmes and the coverage
                           area receiving the BBC's Programmes.

     5.2  CHANGES REQUESTED BY THE BBC

          5.2.1     If the BBC wishes to discontinue, modify, change or add to
                    any part of the Services, then the BBC and TxCo will discuss
                    such modifications, changes or additions with each other,
                    with a view to ascertaining and agreeing the Charges, and
                    other changes required to implement such changes to this
                    Agreement. For the avoidance of doubt an increase in the
                    broadcasting hours for any of the Services shall not be part
                    of the Services which TxCo is obliged to provide without an
                    appropriate increase in the Charges.

          5.2.2     In the event that:

                    (i)  the Charter or the Agreement are modified or any notice
                         is given under the Agreement by the Secretary of State;
                         or

                    (ii) the Secretary of State determines, following the review
                         as contemplated by s33 of the 1996 Act, that analog
                         broadcasting should cease in whole and in part;

                                      35
<PAGE>
 
                         both parties agree to make all necessary changes to
                         this Agreement, including to the Charges. In the event
                         that any such change is likely to result in the
                         reduction of the Charges, the BBC will use its
                         reasonable endeavours to find other services for TxCo
                         to perform for it to make up the shortfall in the
                         Charges, provided that TxCo shall not be obliged to
                                  --------                       
                         undertake additional obligations or liabilities (which
                         involve increased obligations and liabilities overall,
                         having regard to the obligations and liabilities of
                         which it has been relieved because of such a change)
                         without a consequent increase in the Charges. If the
                         BBC fails to find such other services in a reasonable
                         period of time, having regard to the nature of the
                         changes, TxCo agrees to use its reasonable endeavours
                         to secure additional work to make up any shortfall
                         using existing facilities. If TxCo is unable to obtain
                         such work within a reasonable period of time, having
                         regard to the nature of the changes, the BBC will make
                         up any shortfall so that TxCo shall receive the
                         Guaranteed Charges for the Minimum Period only. The
                         Guaranteed Charges as at the date of this Agreement are
                         246.83 million adjusted annually in accordance with
                         Schedule 2. In the event that the BBC has made up any
                         shortfall in the Guaranteed Charges pursuant to this
                         clause 5.2.2 and either pursuant to Clauses 8 and 9 of
                         Schedule 2 or subsequently the BBC wishes to obtain New
                         Services or New Stations from TxCo, TxCo agrees that
                         any additional charges otherwise payable for such New
                         Services or New Stations shall be reduced by the amount
                         of a payment or payments made to make up such shortfall
                         in the Guaranteed Charges.

               5.2.3     If the BBC wishes to relocate any BBC Site on which any
                         TxCo Equipment is located, the BBC will use its
                         reasonable endeavours to provide a suitable replacement
                         site and meet all TxCo's reasonable costs of relocation
                         and re-engineering.

          5.3  MODIFICATIONS TO THIS AGREEMENT INCLUDING CHARGES AND PAYMENT

               All modifications or amendments to this Agreement must be in
               writing and signed by both parties and must specify which
               clauses, schedules and annexes are intended to be amended. All
               such modifications or amendments must be agreed by the Review
               Committee pursuant to Clause 11.

6    ENGINEERING PERFORMANCE STANDARDS

     6.1  MAINTENANCE OF THE ENGINEERING PERFORMANCE STANDARDS

          TxCo shall maintain the Engineering Performance Standards described in
          Schedule 4 in the course of providing the Transmission Services.

     6.2  COMPLIANCE WITH THE ENGINEERING PERFORMANCE STANDARDS

          Engineering Performance Standards shall be checked under the following
          circumstances:

                                      36
<PAGE>
 
          6.2.1     For transmitters comprising TxCo Equipment which, at the
                    Commencement Date, have a parallel configuration and can be
                    operated with one half delivering the BBC's Programmes and
                    the other half carrying test signals into a dummy load,
                    manual checks will be carried out by TxCo at six-monthly
                    intervals.

          6.2.2     If the BBC reasonably believes that TxCo has failed to
                    comply with the Engineering Performance Standards as set out
                    in Schedule 4 or other impairments to the transmission of
                    the BBC's Programmes occur as set out in Schedule 5, Part
                    5.4.1, in respect of any of the Stations, it may give to
                    TxCo written notice to this effect, and TxCo shall carry out
                    checks in conjunction with the BBC within seven days of the
                    date of such notice to ascertain whether such failure has
                    taken place (provided that, in the event of any dispute
                    between the parties, that dispute shall be referred to the
                    BBC Representative and TxCo Representative and thereafter
                    dealt with according to the contract management procedure
                    set out in Clause 3.2.7 above). Where it is substantiated
                    (either by agreement or by arbitration) that such failure
                    has taken place, then the BBC shall be entitled to recover
                    Service Credits to the extent of a failure to meet the
                    Engineering Performance Standards in accordance with
                    Schedule 10.

          6.2.3     For such of the BBC's Programmes as comprise radio signals,
                    performance measurement to ensure compliance with the
                    Engineering Performance Standards shall take place up to
                    twice a year at the request of the BBC or at other times by
                    mutual agreement between the BBC and TxCo. During such
                    tests, TxCo shall deploy staff at a sufficient number of
                    TxCo Sites and will carry out sufficient tests to ensure
                    that the Transmission Network as a whole performs in
                    accordance with the Engineering Performance Standards. In
                    order to perform these tests, the BBC may apply an agreed
                    set of test signals to the Transmission Network, in place of
                    normal programme material. Each of the BBC and TxCo shall
                    bear its own costs in respect of such tests. It is agreed
                    that RF power output, frequency and harmonic radiation do
                    not require any such interruption. If the network tests
                    described above reveal that the Engineering Performance
                    Standards are not being achieved, then TxCo and the BBC
                    shall endeavour to make the Transmission Network available
                    for repair work and for re-tests to take place. In
                    undertaking such re-tests, TxCo shall endeavour to minimise
                    disruption to the Services. TxCo shall be responsible for
                    all costs of such re-tests, including any reasonable costs
                    incurred by the BBC. Any disruption to the Services due to
                    network

                                      37
<PAGE>
 
                    tests and subsequent repair shall not be deemed to be
                    Accountable Faults. If any network test reveals a failure to
                    comply with the Engineering Performance Standards or any
                    other impairment to the transmission of the BBC's
                    Programmes, provided such fault is repaired by TxCo as soon
                    as is reasonably practicable, TxCo shall not be liable to
                    pay Service Credits to the BBC in respect of that impairment
                    or other failure to comply with the Engineering Performance
                    Standards. Any subsequent repairs in respect of that fault
                    and any re-test in respect of that fault made in accordance
                    with this Clause 6.2.3 shall be an Accountable Fault. All
                    such network tests and re-tests will be organised as Planned
                    Interruptions.

7    PERFORMANCE MONITORING

     7.1  PERFORMANCE DATABASE

          Performance monitoring in relation to the Transmission Services shall
          be by reference to the Performance Measures. All source material
          relevant to performance monitoring shall be recorded by TxCo in the
          Performance Database. The Performance Database will be archived on a
          monthly basis, following production of the monthly report referred to
          in Clause 7.3 and the data kept for 3 years from the end of the then
          current Year. All other Services will be monitored by the BBC in
          accordance with the terms of this Agreement, if any.

     7.2  FAULT REPORTING

          7.2.1     TxCo shall provide a fault Reporting information system
                    operating in accordance with Schedule 5 to notify the BBC il
                    it has failed to provide a Service and other-wise to test
                    compliance with the matters set out in Clause 6 above and
                    any matters comprised in the Services (which shall include
                    responsibility to advise the BBC of any failure to meet the
                    Engineering Performance Standards in accordance with
                    Schedule 5).

          7.2.2     As part of its fault reporting information system, TxCo
                    shall maintain its existing Automatic Fault Reporting
                    Equipment.

     7.3  PERFORMANCE REPORTING

          7.3.1     TxCo will Produce a monthly performance review report in the
                    form set out in Schedule 10, Part 4 relating to Performance
                    Measures, together with information showing details of
                    actual performance which differs significantly from the
                    Target Performance Measures (or Outlyers), in data form, for
                    non-Priority Stations. The report shall be sent to the BBC
                    Representative within seven days of the end of each month.
                    In addition, the BBC will be

                                      38
<PAGE>
 
                    sent by TxCo an electronic copy of the Performance Database
                    showing performance over the immediately preceding month, on
                    a monthly basis, within two weeks of the end of the relevant
                    month.

          7.3.2     The Performance Database shall be maintained by TxCo. The
                    BBC shall use the Performance Database and any information
                    or data supplied pursuant to this Agreement relating to
                    TxCo's compliance with this Agreement solely for the
                    purposes of this Agreement. The BBC will be provided with
                    copies of Service Messages produced, in accordance with
                    Schedule 5, electronically to the Operational Point of
                    Contact and the BBC Representative.

8    CUSTOMER COMPLAINTS

     8.1  TxCo agrees that if it receives complaints from members of the public
          about BBC reception problems or otherwise relating to the BBC's
          Programmes, it will refer all such members of the public to the BBC's
          Engineering Information Department. TxCo will only deal with specified
          TV dealers and specified members of the public ringing its 0345 number
          in relation to customer complaints and comments about the Transmission
          Services and the BBC's Programmes.

     8.2  The BBC agrees not to publish and to keep confidential all TxCo
          telephone numbers other than those authorised in writing for
          publication by TxCo.

9    LICENSING

     9.1  TxCo shall be responsible for obtaining and/or complying with all
          necessary planning and building regulations and statutes, civil
          aviation clearances, consents, property title restrictions, superior
          landlord's consents (other than in relation to BBC Sites where it
          shall be the BBC's responsibility to obtain such consents), the NTL
          Agreement and any other necessary licences and consents required under
          the provisions of the Telecoms Act to enable TxCo to perform its
          obligations under this Agreement.

     9.2  The BBC shall be responsible for doing all that is necessary to assist
          TxCo to obtain all necessary licences and consents under the WTA and
          for digital radio or television multiplex licences and shall also
          assist TxCo in ensuring as far as is possible that the relevant
          government agency obtains all international frequency clearances as
          are required in each of those cases 491791/3.2 to provide the
          Services. TxCo will not be responsible for any failure to obtain such
          clearances or licences.

                                      39
<PAGE>
 
10   CONTINUITY OF PROVISION OF SERVICES

     Subject to the provisions of this Clause 10, TxCo shall ensure the
     provision of the Services on a continuous basis as set out in this
     Agreement and comply with the Engineering Performance Standards at all
     times when the BBC's Programmes are scheduled to be transmitted.

     10.1 ROUTINE MAINTENANCE, FAULT REPAIRS AND PLANNED INTERRUPTIONS

          10.1.1    ROUTINE MAINTENANCE, FAULT REPAIRS AND INTERRUPTIONS

                    TxCo shall only interrupt or reduce the Engineering
                    Performance Standards for the Transmission Network at any
                    one or more of the Stations for the purposes of access to
                    works, safety and routine maintenance requirements if it has
                    agreed such interruption or reduction with the BBC in
                    advance, in which case each interruption or reduction shall
                    be a Planned Interruption for the purposes of Clause 10.1.2.
                    No such agreement is needed for repairing faults on TxCo
                    Equipment or pursuant to the NTL Agreement or where TxCo is
                    obliged to carry out work because of any legal or regulatory
                    requirement. If a maintenance or fault repair is required
                    under the terms of any of the Talk or Virgin Agreements or
                    if any legal or regulatory requirement is not immediate,
                    TxCo shall agree any interruption or reduction of the
                    Engineering Performance Standards with the BBC and the BBC
                    agrees to consider such requests in good faith with a view
                    to ensuring that TxCo is not in breach of the Virgin or Talk
                    Agreements or any such legal or regulatory requirement. In
                    all such circumstances, such interruptions or reductions in
                    the Engineering Performance Standards shall not be an
                    Accountable Fault. If repairing faults for third party
                    customers (other than pursuant to the NTL Agreement or
                    either of the Talk or Virgin Agreements) results in any
                    interruption to the Transmission Services or any reduced
                    power operation, such an interruption or reduced power
                    operation will constitute an Accountable Fault, giving rise
                    to an entitlement by the BBC to Service Credits calculated
                    in accordance with Schedule 10. Where otherwise such access,
                    safety and routine maintenance works and/or repairs
                    constitute and cause Accountable Faults, the BBC shall be
                    entitled to recover Service Credits calculated in accordance
                    with Schedule 10. Without prejudice to Clause 5.1 above, in
                    the event of any routine maintenance, fault repairs or
                    Planned Interruptions, TxCo may provide the Transmission
                    Service by any means available whether permanently or
                    temporarily so as to enable it to achieve the standards of
                    the Service required by the relevant Engineering Performance
                    Standards.

                                      40
<PAGE>
 
          10.1.2    PLANNED INTERRUPTIONS

                    TxCo or any third parties authorised by TxCo or exercising
                    third party or other statutory rights may reduce or affect
                    the Engineering Performance Standards in order to carry out
                    inspections, alterations, renewal of or repairs to any
                    equipment at any Station forming part of the Transmission
                    Network, including any reduced power operation at any
                    Priority Station and any notified power outages, provided
                    TxCo shall not cause or otherwise permit such interruptions
                    without first giving reasonable advance notice to the BBC,
                    and shall obtain agreement from the BBC as to the dates and
                    times that such interruptions shall take place, such
                    agreement not to be unreasonably withheld or delayed. Such
                    interruptions shall be "Planned Interruptions", as defined
                    in Schedule 5. TxCo shall use all reasonable endeavours to
                    minimise such Planned Interruptions. Interruptions of
                    transmission of the BBC's Programmes for the purposes of
                    routine maintenance shall only take place at monitored
                    stations as Planned Interruptions. If any Planned
                    Interruption is a result of TxCo performing services for a
                    third party other than services relating to digital audio
                    broadcasting or digital terrestrial television broadcasting
                    or pursuant to the NTL Agreement or either the Talk or
                    Virgin Agreements, or as a result of any legal or regulatory
                    requirement, the interruption shall constitute an
                    Accountable Fault.

          10.1.3    PERMITTED REMOVAL

                    The permitted removal of a Station in accordance with this
                    Agreement shall not constitute a breach of the Engineering
                    Performance Standards.

     10.2 EMERGENCY FAULT REPAIR

          10.2.1    In the event of any interruption to the provision of the
                    Services as a result of a Force Majeure Event, or an
                    imminent fault reasonably apparent to TxCo, TxCo may
                    interrupt the transmission of the BBC's Programmes for the
                    purposes of dealing with the emergency. TxCo will give the
                    Operational Point of Contact immediate notice of the event
                    and whenever possible shall give notice to the Operational
                    Point of Contact of the duration of the interruption.

          10.2.2    TxCo shall use all reasonable endeavours to minimise the
                    duration and effect on the provision of the Services of any
                    unscheduled interruption or fault.

                                      41
<PAGE>
 
          10.2.3    In the case of an emergency when transmission of the BBC's
                    Programmes cannot be restored at full power, reduced power
                    will be employed.

     10.3 SERVICE PRIORITIES

          10.3.1    When all or any of the Services cannot be restored at full
                    power, reduced power operation of all or any of the Services
                    will be employed, if no other arrangements are available to
                    maintain the agreed coverage of the Services. If it is not
                    possible to restore all or any of the Services, the
                    following priorities will normally apply:

                    (i)  if the Station is at a site owned by, or leased or
                         licensed (other than pursuant to the NTL Agreement) by,
                         NTL ("NTL Stations"):

                              television: [*]

                              radio:      [*]

                    (ii) if the Station is at a TxCo Site ("TxCo Stations"):

                              television: [*]

                              radio:      [*]
 
          10.3.2    At radio-only Stations, BBC VHF takes priority over BBC MF.

          10.3.3    At NTL Stations without a BBC R4 or national regional
                    equivalent service, BBC Local Radio will take first
                    priority.

          10.3.4    During a state of national emergency, a different order of
                    priority may be introduced and TxCo will comply with the
                    instructions of the Operational Point of Contact or such
                    other person as may be nominated in writing by the
                    Operational Point of Contact.

          10.3.5    If New Services are added at a Station, the priority set out
                    in 16.3.1 above shall not be altered.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.

                                      42
<PAGE>

     [*]

11   REVIEW OF PERFORMANCE REQUIREMENTS

     TxCo and the BBC will establish a Review Committee to deal with all major
     matters concerning the amendment, or the reviewing of the operation, of
     this Agreement. It will consist of two or more representatives of each
     party, including the TxCo Representative and the BBC Representative, the
     BBC's Director of Policy and Planning and the Deputy Director General of
     the BBC and the Chief Executive Officer of TxCo. Its remit will be as
     follows:

     11.1   to make recommendations to the parties regarding the need for and
            implementation of changes to the Services, including changing the
            designation of Stations as Priority Stations;

     11.2   to attempt to resolve any disputes that may arise between the
            parties which cannot be satisfactorily resolved between the TxCo
            Representative and the BBC Representative, and which are referred to
            it and to make recommendations to the parties regarding any such
            dispute;

     11.3   to monitor technological developments in telecommunications and
            broadcasting which may affect the provision of the Services and to
            make recommendations to the parties regarding the desirability of
            improving the Services in light of such changes and to consider and
            plan for the implementation of New Services;

     11.4   to make recommendations on changes to this Agreement required by
            reason of changes to the Charter and Agreement; and

     11.5   any other matters on which the parties agree from time to time.

12   CHARGES, PAYMENT AND BILLING

     12.1 CHARGES AND PAYMENT FOR THE SERVICES

            The Charges for the first Year of this Agreement shall be as set out
            in Schedule 2 and shall be payable in accordance with that Schedule.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.

                                      43
<PAGE>
 
     12.2    INVOICES

             12.2.1  Each invoice rendered by TxCo will be accompanied by the
                     Billing Information set out in Schedule 2 and delivered in
                     accordance with that Schedule.

             12.2.2  Except as set out in Schedule 2, all correct Charges on an
                     invoice submitted by TxCo under this Agreement will be
                     payable by the BBC on the 15th day of the month following
                     the date of TxCo's invoice (or, if later, the 15th day
                     following receipt of the relevant invoice) (the "due date")
                     (without any set-off, deductions or withholding other than
                     as set out below) by cheque, or by such other method as may
                     be agreed from time to time between the parties.


             12.2.3  In the event that any Charges are disputed, the BBC shall
                     be entitled to withhold any disputed amounts, provided the
                     BBC shall have given reasonable notice to TxCo of the
                     dispute relating to the Charges, together with reasonable
                     written evidence to support the BBC's position. In the
                     event that any Charges are withheld by reason of a dispute,
                     TxCo and the BBC will both use their best endeavours to
                     resolve any such disputed amount prior to the time of
                     delivery of TxCo's next invoice.

     12.3    INTEREST ON LATE PAYMENT

             TxCo reserves the right to charge daily interest on outstanding
             amounts, including amounts disputed by the BBC but later agreed to,
             or found to be payable to TxCo, from the due date as defined in
             Clause 12.2.2 and until payment in full is received by TxCo at a
             rate equal to 2% above the Lloyds Bank Plc base lending rate as
             current from time to time, whether before or after judgment.
             Interest will continue to accrue on any unpaid amounts
             notwithstanding termination of this Agreement for any cause.

     12.4    FAILURE TO MEET SERVICE OBLIGATIONS - SERVICE CREDITS

             12.4.1  The amount of compensation payable by TxCo to the BBC for
                     failing to comply with its obligations under this
                     Agreement, including the Engineering Performance Standards,
                     will be solely limited to Service Credits. TxCo shall not
                     be liable to pay Service Credits to the BBC in any Year in
                     excess of the Charges for the Year in respect of which the
                     Charges were incurred. Service Credits shall not be payable
                     in respect of DAB Services until the relevant Station has
                     been Accepted by the BBC at which time there shall be no
                     obligation to pay Service Credits in relation to such
                     Station.

                                      44
<PAGE>
 
           12.4.2  The Charges payable hereunder will be subject to Service
                   Credits in respect of failure by TxCo to meet the Engineering
                   Performance Standards, calculated by reference to the
                   Performance Measures as set out in Schedule 10. Any Service
                   Credits incurred will be set against the Charges payable
                   under the first invoice rendered by TxCo following the end of
                   the Year in which the obligation to give Service Credits is
                   determined in accordance with Schedule 10.

           12.4.3  Without prejudice to Clause 13.2.2, Service Credits will not
                   be available to the BBC to the extent that the failure of
                   TxCo to meet all or any part of the Engineering Performance
                   Standards results directly from the BBC's act, fault or
                   omission or from any Force Majeure Event.

           12.4.4  If there is a total failure to transmit any of BBC 1, BBC 2,
                   Radio 1 FM, Radio 2 FM, Radio 3 FM, Radio 4 FM, Radio 4
                   MF/LF, Radio 5 Live, DAB Services or Regional Broadcasting or
                   to transmit the DF Transmitted Services altogether in
                   circumstances where the failure to transmit is an Accountable
                   Fault or Clause 3.1.2 is not the sole reason for such
                   failure, rather than a partial failure to transmit any of the
                   services listed above, for anything other than an immaterial
                   period of time having regard to the nature of the relevant
                   BBC service, then TxCo shall not be entitled to make any
                   charge for the relevant service and, in addition, shall be
                   required to pay to the BBC up to 100% of the cost to the BBC
                   of obtaining the equivalent service elsewhere. The BBC shall
                   not be entitled to obtain such services elsewhere if TxCo is
                   able at any reasonable time to perform such services and
                   undertakes to do so, subject to any rights of termination
                   under Clause 13, and subject to a reasonable period following
                   notice of TxCo's intention to re-commence performance of the
                   Services. If TxCo pays any monies under this Clause, no
                   Service Credits shall be payable in respect of the period of
                   time for which there is a failure to perform compensated
                   under this Clause.

     12.5  CALCULATION OF SERVICE CREDITS

           12.5.1  The BBC will be entitled to Service Credits in respect of the
                   Performance Measure for each of BBC1, BBC2, Radio 1, Radio 2,
                   Radio 3, Radio 4 FM, Radio 4MF, Radio 5 Live, DAB and
                   Regional Radio and Local Radio in accordance with Schedule
                   10, subject to this Clause 12.

                                      45
<PAGE>
 
           12.5.2  Service Credits shall be calculated as set out in Schedule
                   10, Part 1. They are intended to act as an incentive to TxCo
                   to provide quality Services to the BBC.

13   TERMINATION
     
     This Agreement may be terminated at any time by agreement between the
parties.

     13.1  THE SERVICES

           13.1.1  GENERALLY

                   If no notice of termination is given within one (1) year of
                   the expiry of the Term, this Agreement shall continue from
                   year to year until terminated on one (1) year's written
                   notice to expire at the end of any Year of this Agreement.

           13.1.2  BY EITHER PARTY

                   Either party has the right to terminate this Agreement other
                   than the Site Sharing Agreements, which Agreements shall be
                   terminable in accordance with their terms, with immediate
                   effect by notice in writing in the event that:

                   (i)   a liquidator, administrative receiver, administrator or
                         receiver is appointed (other than for the purpose of an
                         amalgamation or reconstruction the terms of which have
                         been previously approved by the party having the right
                         to terminate (such approval not to be unreasonably
                         withheld or delayed in the case of a solvent
                         amalgamation or reconstruction) in respect of the whole
                         or a material part of the assets and/or undertaking of
                         the other party; or

                   (ii)  the other party enters into an arrangement or
                         composition with its creditors, or if it becomes unable
                         to pay its debts within the meaning of Section 123 of
                         the Insolvency Act 1986.

           13.1.3  SUSPENSION/TERMINATION OF INDIVIDUAL SERVICES

                   (i)   TxCo may suspend provision of the Services in whole or
                         in part until further notice on notifying the BBC
                         either orally (confirming such notification in
                         writing), or in writing with immediate effect if:

                         (a)  TxCo is entitled to terminate this Agreement; or

                                      46
<PAGE>
 
                         (b)  TxCo is obliged to comply with an order,
                              instruction or request of any Government minister,
                              the Home Office, the Channel Islands authorities,
                              an emergency services organisation or other
                              competent administrative authority.

                   (ii)  if TxCo exercises its right of suspension in respect of
                         an event referred to in Clause 13.1.3(i), this will not
                         exclude TxCo's right to terminate this Agreement later
                         in respect of that or any other event, nor will it
                         prevent TxCo from claiming damages from the BBC
                         resulting from such event if the BBC is in breach of
                         this Agreement.

                   (iii) Notwithstanding Clause 13.1.3(i)(b), it is acknowledged
                         that, in the event of an emergency, the respective
                         obligations of the BBC and TxCo will be governed by
                         special arrangements under the relevant Emergency
                         Powers and TxCo agrees that it will not suspend service
                         to the BBC other than on the instructions of the
                         relevant authorities in the event of an emergency.

     13.2  FORCE MAJEURE
          
           13.2.1  In the event of the occurrence of a Force Majeure Event
                   affecting either TxCo or the BBC, the affected party shall
                   give notice in writing thereof to the other party as soon as
                   possible and shall likewise give notice on the cessation of
                   the Force Majeure Event. The parties agree to discuss a
                   course of action and to comply with any agreed course of
                   action pursuant to Clause 13.2.2. Subject thereto, if the
                   Force Majeure Event continues for a period of more than 60
                   days following a failure to either agree a course of action
                   under Clause 13.2.2 or to comply with such a course of
                   action, then the non-defaulting party shall have the right to
                   terminate either:

                   (i)   subject to Clause 13.3 below, in the case of any
                         affected Deferred Facilities, the Site Sharing
                         Agreement (if any) for the Station so affected by 30
                         days' written notice; or

                   (ii)  the provision of the Services or any of the Services
                         from the Station so affected by 30 days' written
                         notice; or

                   (iii) where the Force Majeure Event affects all or
                         substantially the whole of the Stations comprised in
                         all or part of this Agreement, terminate all or that
                         part of this Agreement, in the case of (i) or (ii)
                         above upon giving 30 days' written notice of such
                         termination to the other party and in the case of this
                         paragraph giving to the other not less than 90 days'
                         prior written notice.

                                      47
<PAGE>
 
           13.2.2  Where a Force Majeure Event occurs, other than one affecting
                   delivery of the BBC's Programmes to TxCo for transmission
                   which causes suspension of the Services, the BBC and TxCo
                   shall discuss and agree on the most appropriate course of
                   action to be taken for a resumption of the Services and/or
                   the provision of a temporary service and the timescale within
                   which such action is to be taken. If, having agreed a
                   timescale for the resumption of any Service, TxCo shall fail
                   to comply with that timescale not having agreed any extension
                   of time, then the BBC shall be entitled to serve notice on
                   TxCo requiring that, unless the Services are resumed within a
                   period of seven working days for a non-Priority Station and
                   three working days for a Priority Station from the deemed
                   date of delivery of the notice (ascertained in accordance
                   with Clause 22), then the BBC shall be entitled to receive
                   Service Credits for the Charges for that Station from the end
                   of the seven day or three day period referred to above to the
                   date on which the Services are resumed or a temporary service
                   provided.

     13.3  EMERGENCY SERVICES

           To the extent that any Force Majeure Event relates to the provision
           of either the Emergency Services, compliance with a direction under
           Section 94 of the Telecoms Act or activation of the Deferred
           Facilities, the provision of this Agreement relating to such Services
           shall prevail and Clause 13.2 shall not take effect if it would only
           have taken effect by reason of events giving rise to the need for
           TxCo to perform the Emergency Services, in accordance with the
           relevant direction or activation of the Deferred Facilities.

     13.4  TERMINATION FOR BREACH

           Either party will have the right to terminate this Agreement, without
           prejudice to its other rights and remedies, by notice in writing
           taking effect 30 days after the date of the notice, in the event that
           the other party is in material breach of this Agreement, and, in the
           case of a breach which is material or could amount to a material
           breach if not remedied and which, in either case, is remediable,
           fails to remedy the breach within a reasonable time (being not less
           than 60 days) specified in the written notice to either TxCo and to
           any person to whom TxCo has assigned the benefit of this Agreement in
           accordance with Clause 17.1 or to the BBC, as appropriate, requesting
           the breach to be remedied.

     13.5  TERMINATION ON CHANGE OF CONTROL

           13.5.1  The BBC will be entitled to terminate this Agreement if:

                                      48
<PAGE>
 
                   (i)   there is a Change of Control of a Relevant Company
                         other than on:

                         (a)  the disposal of TxCo pursuant to the Proposed Sale
                              Agreement;

                         (b)  a transfer of Shares between an existing
                              shareholder in a Relevant Company and an Associate
                              of such shareholder; or

                         (c)  the creation of a mortgage, charge, encumbrance or
                              security interest over or in respect of any Shares
                              of a Relevant Company;

                   (ii)  either of CTC or TDF or any Associate of either of them
                         breaches any of the undertakings contained in Clause 3
                         of the Commitment Agreement;

                   (iii) at any time before Listing there is a disposal of any
                         Shares in a Relevant Company to any UK broadcast
                         transmission operator.

           13.5.2  TxCo shall notify the BBC as soon as possible after it or any
                   Relevant Company becomes aware of any Change of Control of a
                   Relevant Company, or of any potential Change of Control or in
                   other circumstances which would or might give rise to a
                   termination right under this Clause 13.5.

           13.5.3  The BBC agrees that it will only exercise its right to
                   terminate pursuant to a Change of Control which arises in the
                   circumstances set out in paragraph (i) (a) or (iii) of the
                   definition of Change of Control if it reasonably considers
                   that the event giving rise to such right is contrary to the
                   BBC's corporate interests and/or those of Her Majesty's
                   Government and the BBC agrees that any notice of termination
                   (regardless of the period of notice set out in such notice)
                   will be given by the BBC within one month of receipt of
                   notice of the relevant event. The BBC agrees to consider in
                   good faith any request for the sale of any Relevant Company's
                   Shares or any other arrangement which might otherwise give
                   rise to such a termination right, having regard to the
                   reasonable interests of the BBC, TDF and CTC, and each
                   Relevant Company and those of Her Majesty's Government.

           13.5.4  For the purposes of this Clause 13.5:

                   "Acting in Concert" has the meaning given to it in The City
                   Code on Takeovers and Mergers;

                                      49
<PAGE>
 
                   "Associate" means, in relation to a person, (a) a subsidiary
                   or holding company (as those terms are defined by Section 736
                   of the Companies Act 1985) of that person or a subsidiary of
                   that person's holding company (a "Group Company"); or (b) any
                   limited partnership, the general partner of which is a Group
                   Company; (c) any limited partner in any limited partnership,
                   the general partner of which is a Croup Company; (d) any fund
                   managed or advised by a Group Company; (e) any employee of
                   such person or any Group Company; (f) who is a partnership,
                   that party's constituent partners, and (g) in the case of
                   Berkshire, Berkshire Fund IV, a limited partnership;

                   "Berkshire" means Berkshire Fund IV Investment Corp;

                   "Candover" means Candover Investments plc;

                   "Completion" means completion of the sale to Castle
                   Transmission Services (Holdings) Limited (formerly Dichold
                   Limited) of the whole of the issued share capital of TxCo
                   pursuant to the Proposed Sale Agreement;

                   "Commitment Agreement" means the agreement of even date
                   between the BBC, CTC, TeleDiffusion de France SA and TDF as
                   amended from time to time and as supplemented by any deed of
                   adherence to such agreement;

                   "Control" has the meaning given to it in Schedule 2, Part 1
                   paragraph (3)(b) of the Broadcasting Act 1990, as amended by
                   the 1996 Act; and "Controlled" has a corresponding meaning;

                   "Change of Control" means in relation to a Relevant Company:

                   (i)   before a Listing, where a Third Party acquires, obtains
                         in any manner or in any circumstances comes to hold:
                    
                         (a)  Control of a Relevant Company;

                         (b)  a Relevant interest in a Relevant Company's Share
                              capital; or

                         (c)  such Interest in the Relevant Company's Share
                              capital as would, when taken with those already
                              held by such Third Party or by any Associate of,
                              or person Controlled by or Acting in Concert with,
                              such Third Party, amount to a Relevant Interest, 

                                      50
<PAGE>
 
                   PROVIDED THAT for the purposes of (a), (b), and (c) above,
                   any interest held by CTC or TDF or persons Acting in Concert
                   with CTC or TDF or any of their prospective Associates prior
                   to the relevant circumstances shall be disregarded for the
                   purpose of determining whether a Relevant Interest or Control
                   has been acquired, obtained or is held;

                   (ii)  on or alter a Listing, where a Third Party acquires,
                         obtains in any manner or in any circumstances comes to
                         hold:

                         (a)  a Relevant Interest in a Relevant Company's Share
                              capital; or

                         (b)  such Interest in the Relevant Company's Share
                              capital as would, when taken with those already
                              held by such Third Party or by any Associate of,
                              or person Controlled by or Acting in Concert with,
                              such Third Party, amount to a Relevant Interest;

                   (iii) on or after a listing, a Third Party, by itself or
                         together with any persons Acting in Concert with it,
                         obtaining in any manner or in any circumstances coming
                         to hold an Interest in 25% or more of the Shares of a
                         Relevant Company and Control of the Relevant Company,

                   PROVIDED THAT any scheme of arrangement for the purpose of
                   reconstruction or reorganisation of the assets of a Relevant
                   Company shall not, without further alteration in Control,
                   constitute a Change of Control;

                   "CTC" means Castle Tower Holding Corporation;

                   "Interest" means, in relation to the Shares of a Relevant
                   Company, any legal or beneficial interest in them or any
                   right or power (whether conditional or unconditional and
                   whether legally enforceable or otherwise) to exercise control
                   (directly or indirectly) over the disposal of those Shares or
                   over the manner of exercise of any right to vote in a general
                   meeting attached to such Shares;

                   "Indirect Interest" means, where a company ("A") has an
                   interest (directly or through one or more intermediate
                   companies) in the Shares of a company ("B") which, in turn,
                   has an interest in the Shares of another company ("C") (in
                   which A is not directly interested), B's percentage interest
                   in the Shares of C multiplied by such percentages

                                      51
<PAGE>
 
                   as represent each of the percentage interests in the Shares
                   of B held directly by A or through one or more intermediate
                   companies in which A has an Indirect Interest.

                   "Listing" means the first listing of any of the Shares of any
                   Relevant Company on any stock exchange or public dealings
                   facility and "listed" shall be construed accordingly;

                   "Relevant Interest" means, in relation to any Shares of a
                   Relevant Company:

                   (i)   on or after a Listing an Interest in 30 per cent or
                         more of the Relevant Company's Shares; or

                   (ii)  at any time before a Listing, any Interest (other than
                         any Interest of Candover or Berkshire or any of their
                         respective Associates) which taken together with any
                         other direct Interest or Indirect Interest in the
                         Shares of CTS exceeds the combined Indirect Interest of
                         TDF and CTC in the Shares of CTS at that time;

                   "Relevant Company" means TxCo or any holding company (as that
                   term is defined by Section 736 of the Companies Act 1985) of
                   TxCo;

                   "Relevant Person" means, in relation to a Relevant Company,
                   any person or any one of two or more persons Acting in
                   Concert who have Control of the Relevant Company;

                   "Shares" means, in relation to a Relevant Company, the shares
                   in the relevant share capital (as that expression is defined
                   in Section 198(2) of the Companies Act 1985) of that Relevant
                   Company and shall include any shares which have been allotted
                   (whether conditionally or unconditionally);

                   "TDF" means TeleDiffusion de France International; and

                   "Third Party" means any person other than a Relevant Person
                   or an Associate of a Relevant Person.

     13.6  CONSEQUENCES OF TERMINATION

           Upon termination of this Agreement for any reason the BBC will:

           13.6.1  immediately cease to make use, and shall procure that any
                   Affiliate immediately ceases to make use, of the Services;
                   and

           13.6.2  immediately cease to make use, and shall procure that any
                   Affiliate immediately ceases to make use, of the TxCo
                   Equipment.

                                      52
<PAGE>
 
     13.7  DETAILS OF EMPLOYEES

           Six months before the termination or assignment of this Agreement, or
           if the Agreement is terminated without notice for any reason as soon
           as reasonably practicable, but in either case if requested to do so
           by the BBC where there is a reasonable prospect that the Transfer
           Regulations will apply to transfer the contracts of employment of
           some or all of the Employees upon such termination or assignment of
           this Agreement, TxCo will provide, and will procure that any Relevant
           Employers will provide, to the BBC, or at the BBC's request to the
           Successor Operator, the following particulars of the Employees
           employed as at that date to the extent permitted by law:

           13.7.1  name, sex and the date on which continuity of employment
                   began for each Employee for statutory purposes;

           13.7.2  the terms and conditions of employment of each such Employee;

           13.7.3  all payments, benefits or changes to terms and conditions of
                   employment promised to any such Employee;
          
           together with particulars of:

           13.7.4  dismissals of any other Employees or terminations of
                   employment effected within 12 months of the Transfer Date;

           13.7.5  all agreements or arrangements entered into in relation to
                   any such Employee between TxCo or any other Relevant Employer
                   and any trade union or association of trade unions or
                   organisation or body of employees including elected
                   representatives; and

           13.7.6  all strikes or other material industrial action taken by any
                   such Employee within 12 months of the Transfer Date.

     13.8  TRANSFER REGULATIONS

           13.8.1  On termination of this Agreement the Transfer Regulations may
                   transfer the Relevant Employees to the BBC or the Successor
                   Operator. If the Transfer Regulations have effect the
                   following provisions shall apply:

                   (i)   the contract of employment of each of the Relevant
                         Employees (save insofar as such contract relates to any
                         occupational pension scheme) shall be transferred to

                                      53
<PAGE>
 
                         the BBC or, as the case may be, the Successor Operator
                         with effect from the Transfer Date which shall be the
                         "time of transfer" under the Transfer Regulations;

                   (ii)  TxCo shall perform and discharge all its obligations in
                         respect of all the Relevant Employees for its own
                         account up to and including the Transfer Date
                         including, without limitation, discharging all wages
                         and salaries of the Relevant Employees, all employer's
                         contributions to any relevant occupational pension
                         scheme and all other costs and expenses related to
                         their employment (including, without limitation, any
                         taxation, accrued holiday pay, accrued bonus,
                         commission or other sums payable in respect of service
                         prior to the close of business on the Transfer Date)
                         and shall indemnify the Successor Operator and keep the
                         Successor Operator indemnified against each and every
                         action, proceeding, liability (including, without
                         limitation, any taxation liability directly related to
                         the Relevant Employees), cost, claim, expense
                         (including, without limitation, reasonable legal fees)
                         or demand arising from, TxCo's failure so to perform
                         and discharge. The BBC shall, or, as the case may be,
                         shall procure that the Successor Operator shall perform
                         and discharge all its obligations from the Transfer
                         Date;

                   (iii) TxCo shall indemnify the Successor Operator (on an
                         after-tax basis) and keep the Successor Operator so
                         indemnified against each and every action, proceeding,
                         cost, claim, liability (including, without limitation,
                         any taxation liability directly related to the Relevant
                         Employees), expense (including, without limitation,
                         reasonable legal fees) or demand which relates to or
                         arises out of any act or omission by TxCo or any other
                         event or occurrence prior to the Transfer Date and
                         which the Successor Operator may incur in relation to
                         any contract of employment or collective agreement
                         concerning one or more of the Relevant Employees
                         pursuant to the provisions of the Transfer Regulations
                         or otherwise including, without limitation, any such
                         matter relating to or arising out of:

                         (a)  TxCo's rights, powers, duties and/or liabilities
                              (including, without limitation, any taxation)
                              under or by virtue of any such contract of
                              employment or collective agreement, which rights,
                              powers, duties and/or liabilities (as the case may
                              be) are or will be transferred to the Successor
                              Operator in accordance with the Transfer
                              Regulations; or 

                                      54
<PAGE>
 
                   (b)   anything done or omitted before the Transfer Date by or
                         in relation to TxCo in respect of any such contract of
                         employment or collective agreement or any Relevant
                         Employee, which is deemed by the Transfer Regulations
                         to have been done or omitted by or in relation to the
                         Successor Operator;

                   (iv)  if any contract of employment or collective agreement
                         which is not in accordance with Clause 13.7 above
                         disclosed in writing to the BBC, or at its request to
                         the Successor Operator, by TxCo prior to the Transfer
                         Date shall have effect as if originally made between
                         the Successor Operator and any employee ("Undisclosed
                         Employee") or a trade union as a result of the
                         provisions of the Transfer Regulations (without
                         prejudice to any other right or remedy which may be
                         available to the Successor Operator):

                         (a)  the Successor Operator may, upon becoming aware of
                              the application of the Transfer Regulations to any
                              such contract of employment or collective
                              agreement and in any event within 3 months of the
                              Transfer Date, terminate such contract or
                              agreement forthwith, and TxCo shall indemnify the
                              Successor Operator (on an after-tax basis) in
                              respect of any Undisclosed Employee so dismissed
                              on the same terms mutatis mutandis as TxCo has
                              indemnified the Successor Operator in respect of a
                              Relevant Employee pursuant to the terms of Clause
                              13.8.1 (ii) and 13.8.1 (iii); and

                         (b)  TxCo shall indemnify the Successor Operator (on an
                              after-tax basis) against each and every action,
                              proceeding, cost, claim, liability (including,
                              without limitation, reasonable legal fees) or
                              demand relating to or arising out of such
                              termination and reimburse the Successor Operator
                              for all costs and expenses (including, without
                              limitation, any taxation) incurred in employing
                              such employee in respect of his employment
                              following the Transfer Date provided that if,
                              within 3 months of the Transfer Date, the Operator
                              has not dismissed such Undisclosed Employee, such
                              Undisclosed Employee shall be deemed for all
                              purposes of this Agreement to be and at all
                              relevant times to have been a Relevant Employee
                              and so that this Clause 13.8.1 (iv) shall not
                              apply in respect of such Undisclosed Employee; and

                   (v)   TxCo shall indemnify the Successor Operator (on an
                         after-tax basis) and keep the Successor Operator so
                         indemnified against each and every action, proceeding,

                                      55
<PAGE>
 
                         cost, claim, liability (including, without limitation,
                         any taxation), expense (including, without limitation,
                         reasonable legal fees) or demand which relates to or
                         arises out of any dismissal (including, without
                         limitation, constructive dismissal) by TxCo of any
                         employee (not being a Relevant Employee) which the
                         Successor Operator may incur pursuant to the provisions
                         of the Transfer Regulations.

           13.8.2  If TxCo assigns this Agreement to the TxCo Assignee, or sub-
                   contracts its obligations under this Agreement in respect of
                   all or part of the Services to any firm, person or company
                   (the "TxCo Sub-Contractor"), TxCo shall procure that the TxCo
                   Assignee or, as the case may be, the TxCo Sub-Contractor will
                   indemnify the Successor Operator in the same terms, mutatis
                   mutandis, as TxCo has indemnified the Successor Operator in
                   Clause 13.8.1.

           13.8.3  In Clause 13.8.1 the undertakings and indemnities given by
                   TxCo to the Successor Operator shall be given to the BBC for
                   itself and as trustee for any BBC Assignee or the Successor
                   Operator.

14   THIRD PARTY SERVICES

     14.1  Nothing in this Agreement shall prevent or interfere with any
           existing arrangements made by TxCo to transmit programmes or other
           broadcast and non-broadcast signals made by or on behalf of third
           parties or to provide telecommunication services to any third parties
           from any of the Stations during the term of this Agreement or from
           entering into any new arrangements with any third parties to provide
           broadcasting, transmission and/or any other telecommunications
           services from the Stations provided that such new arrangements shall
           not detrimentally affect the existing contracted provision of the
           Services to the BBC and further provided that TxCo agrees not to use
           the frequencies set out in Annex A other than for performance of the
           Transmission Services unless the BBC consents to such use or as TxCo
           is contractually bound to do at the date hereof.

     14.2  For the avoidance of doubt the parties hereto agree and confirm that
           any exercise by TxCo of its rights described in Clause 14.1 hereof
           shall not affect or otherwise entitle the BBC to require any
           reduction or other adjustment to the Charges payable under this
           Agreement at any time during the Term other than as set out in Clause
           10.1 above.

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<PAGE>
 
15   WARRANTIES AND UNDERTAKINGS

     15.1  TxCo hereby warrants and undertakes that it holds and will continue
           to hold during the Term all necessary licences and consents under the
           Telecoms Act and the WTA and all consents and clearances of whatever
           nature as is required to enable it to perform its obligations under
           this Agreement and shall comply with the terms of all such licences
           and consents and shall not do anything or omit to do anything which
           would cause such licences or consents to be revoked or not renewed.

     15.2  The BBC shall obtain at its own expense and hold during the currency
           of this Agreement all necessary licences and consents under the
           Charter and Agreement, the Broadcasting Act, the 1996 Act, the WTA
           (which, for the avoidance of doubt will not include a broadcasting
           services licence under the WTA) and all consents, clearances and
           other rights of whatsoever nature which are required to permit the
           BBC to perform its obligations under this Agreement and otherwise and
           shall do all things necessary to comply with the terms of such
           licences and consents and shall not do anything or omit to do
           anything which would cause such licences and consents to be revoked
           or not renewed.

     15.3  TxCo shall do all things necessary to renew any leases or licences
           for the Sites on which the Stations identified in the list contained
           in Annex 1 or any substituted list inserted therein are located, so
           that they subsist for the duration of this Agreement or any agreed
           renewal of the same, provided that (subject to Clause 5.1 above) TxCo
           shall not be required to renew such leases or licences on other than
           reasonable terms.

16   LIABILITY AND INSURANCE

     16.1  Both parties agree to maintain insurance against any loss, damages,
           claims or actions arising from:

           16.1.1  personal injury or death;

           16.1.2  public liability; and/or

           16.1.3  any other liability for which either is required by law to
                   insure,

           arising out of the performance of this Agreement, the Site Sharing
           Agreements, R&D Services Agreement, the Computer Services Agreement,
           the General Services Agreement, the Teleswitching Agreement or the
           Telecommunications Agreement (collectively, the "Contracts") or

                                      57
<PAGE>
 
           the ownership or occupation of the BBC Sites or the TxCo Sites. Where
           TxCo engages a subcontractor, it shall ensure that its insurance
           includes cover for its liabilities in respect of the acts and
           omissions of its sub-contractors or that its sub-contractors have
           their own insurance with appropriate cover in the light of the work
           to be undertaken by the sub-contractors. TxCo agrees to maintain
           insurance cover adequate to cover the risks which it is likely to
           incur, with a minimum of primary public and products liability
           insurance in a form reasonably acceptable to the BBC providing for
           payment of a sum up to (Pounds)50 million for any one occurrence (or
           in the annual aggregate for products liability) and, in the case of
           third party property damage arising out of the use of private
           vehicles, unlimited cover and, in the case of third party property
           damage, arising out the use of commercial vehicles, (Pounds)5 million
           in respect of one occurrence, and employers liability insurance
           sufficient to meet its statutory requirements and sufficient to cover
           any liabilities to past or present employees under the Transfer
           Scheme. As at the Commencement Date the BBC confirms that it has been
           informed of TxCo's insurance cover and considers it reasonable.

     16.2  TxCo shall additionally effect and maintain all risks or loss or
           damage to property and business interruption insurance in a form
           reasonably acceptable to the BBC in respect of each of the Stations,
           DF Assets, the TxCo Sites and all TxCo Equipment used to provide the
           Services covering the full re-instatement value of all such assets
           and the reasonable cost of any replacement Transmission Services from
           the Stations or any other stations used to supply any part of the
           Transmission Services.

     16.3  Subject to Clauses 16.1 and 16.2 above, each of the BBC and TxCo
           shall indemnify the other on an after-tax basis against all claims or
           actions brought against the other by any third party for personal
           injury or loss of, or damage to, property or any other loss
           occasioned by Interference or denial of access caused as a result of
           any wilful or negligent act or wilful or negligent omission by the
           party from whom indemnification is sought (including but not limited
           to the performance of any operations or the provision of services or
           of equipment). The party from whom indemnification is sought shall
           have the right to conduct or settle any proceedings brought by a
           third party against the other party or subject to reimbursing the
           other party any costs of such proceedings and any damages, costs and
           expenses payable by the indemnified party arising out of those
           proceedings. Both parties will notify the other as soon as possible
           of the existence of a claim which is reasonably likely to give rise
           to a claim for indemnification under this Clause.

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<PAGE>
 
     16.4  Subject to Clauses 16.1 and 16.3 above, each of the BBC and TxCo will
           indemnify the other on an after-tax basis against any loss incurred
           by the relevant party resulting from damage to that party's property
           or injury to its employees or the employees of its agents or sub-
           contractors arising out of any breach of any of its obligations,
           warranties or undertakings contained in any of the Contracts or any
           other agreements between the parties or any other negligent or wilful
           act or omission of the party from whom an indemnity is sought. The
           party from whom indemnification is sought shall have the right to
           conduct any proceedings brought by a third party against the other
           party or to settle any such proceedings subject to reimbursing the
           other party any costs of such proceedings and any damages, costs and
           expenses payable by the indemnified party arising out of those
           proceedings.

     16.5  Neither TxCo nor the BBC shall be held responsible for the
           consequences of any act or omission or misconduct of any third party,
           unless:

           16.5.1  such third parties are in the employment of or providing sub-
                   contracted services to either TxCo or the BBC at the time the
                   incident takes place; or

           16.5.2  the party claimed against has recovered damages in respect of
                   such act, omission or misconduct directly from the relevant
                   third party or otherwise where it has recovered insurance
                   (and in each such case to the extent of such recovery or
                   insurance claim) provided that where such party is entitled
                   to claim damages and/or recover under such insurance policy
                   it shall use all reasonable endeavours to do so as soon as
                   reasonably practicable, in which circumstances the provisions
                   of Clauses 16.3 and 16.4 above shall apply.

     16.6  TxCo shall not be liable to the BBC for loss of profits or for any
           indirect, special, incidental or consequential loss whatsoever
           arising out of its performance of or failure to perform any of the
           Contracts or otherwise. For the avoidance of doubt, TxCo is liable to
           pay to the BBC any Service Credits payable in accordance with
           Schedule 10, subject to the provisions of Clause 12.

     16.7  The BBC shall not be liable to TxCo for loss of profits or for any
           indirect, special, incidental or consequential loss whatsoever
           arising out of its performance of or failure to perform any of the
           Contracts or otherwise provided that this Clause is not intended to
           operate nor shall it operate to deprive TxCo of damages comprising
           the direct profit and any other direct losses which it would
           otherwise have recovered from the BBC for breach of any of the
           Contracts.

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<PAGE>
 
     16.8   TxCo agrees to maintain insurance covering professional indemnity of
            at least ,5 million per year, commensurate with the nature of the
            risks undertaken in that year, including all risks assumed under the
            General Services Agreement.

     16.9   Without prejudice to Clause 16.6, TxCo's aggregate liability in any
            one Year to the BBC for any loss suffered by the BBC and caused or
            contributed to by TxCo shall not exceed [*].

     16.10  In the event of loss or damage to any of the BBC DF caused by the
            negligence or wilful act of any employee or agent or subcontractor
            of TxCo, TxCo may (without prejudice to the BBC's other rights and
            remedies), at its own expense and as soon as practicable, and
            recognising that time is of the essence, either restore such BBC DF
            substantially to the condition that they were in immediately before
            such damage, or, at its own election, replace such of the damaged
            BBC DF with equipment in a condition similar to or better than that
            of the BBC DF immediately before such loss or damage.

     16.11  Neither party excludes or restricts liability for death or personal
            injury resulting from its own negligence or from liability arising
            under the Health and Safety at Work Act 1974 or any regulations made
            pursuant to that Act.

     16.12  Save to the extent that monies are recovered via any third party
            insurance policy or policies effected by third party contractors, no
            liability under this Agreement shall attach to TxCo, its employees
            or contractors in respect of the performance, safety or suitability
            for its purpose of any of the BBC DF except where the installation
            of the same was supervised or carried out by, or on behalf of, TxCo
            and except insofar as TxCo is in breach of its maintenance
            obligations as set out in Schedule 9.

     16.13  The BBC shall be legally responsible for insuring or procuring the
            insurance of the BBC DF (insofar as it is able) against fire and
            such other usual commercial risks as the BBC may reasonably decide
            for full replacement cost and for the purposes of any third party
            claim for the duration of this Agreement.

     16.14  Where requested by the BBC, TxCo agrees to provide the BBC with a
            copy of the relevant policy or policies or evidence of such
            insurance and its material terms referred to in this Clause 16,

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.

                                      60
<PAGE>
 
            which shall be treated by the BBC as confidential information
            belonging to TxCo. TxCo will also notify the BBC of any substantive
            chance to the insurance programme maintained by it and referred to
            in this Clause 16 or the risks covered.

     16.15  Subject to Clause 16.1 above, the BBC's liability for all matters
            under the Contracts, other than for payment of the Charges under
            this Agreement and any charges under any other of the Contracts or
            in respect of the repudiatory breach of any of the Contracts, shall
            be limited to [*].

     16.16  This Agreement sets out the full extent of each party's obligations
            and liabilities relating to the Services whether in contract, tort,
            negligence, breach of statutory duty or otherwise. In particular,
            there are no conditions, warranties or other terms, express or
            implied, as to satisfactory quality, fitness for purpose or of any
            other kind whatsoever that are binding on TxCo except as
            specifically set out in this Agreement. Any other condition,
            warranty or other term relating to the provision of the Services
            which might otherwise have been implied into this Agreement by
            statute, common law or otherwise is hereby excluded.

     16.17  TxCo shall discuss and comply, where any BBC disaster recovery plan
            covers the Services or any part of the Services, with the BBC
            disaster recovery plan or any other emergency procedures which may
            be developed from time to time and notified to TxCo by the BBC, and
            develop, test and use its own disaster recovery Plan or other
            emergency procedures, to ensure that the provision of the Services
            to the BBC are sustained to TxCo's best ability in the event of any
            disaster or emergency. The BBC will reimburse TxCo for any
            reasonable additional costs incurred by TxCo at the request of the
            BBC in complying with, or testing, the BBC disaster recovery plan or
            any other emergency procedures.

17   ASSIGNMENT AND SUB-CONTRACTING

     17.1   This Agreement is personal to the parties hereto and they shall not
            assign, transfer, charge or deal in any other manner with this
            Agreement other than as expressly set out below except that TxCo
            shall be entitled to assign its rights to payments under this
            Agreement by way of security to any person providing finance to it
            or its holding company(ies).

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.

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<PAGE>
 
     17.2   Each of TxCo and the BBC shall be entitled to transfer this
            Agreement to any of its wholly owned subsidiaries provided that:

            17.2.1  each party procures that the transferee is bound by a direct
                    covenant with the other party to observe all the terms of
                    this Agreement and the covenants and obligations by the
                    transferor contained in the Site Sharing Agreements and this
                    Agreement; and

            17.2.2  if any transferee ceases to be a wholly owned subsidiary of
                    either the BBC or TxCo, as the case may be, this Agreement
                    will be transferred back to TxCo or the BBC, or to one of
                    their wholly owned subsidiaries.

18   FORCE MAJEURE

     18.1   Neither party shall be liable to the other for any failure to
            perform its obligations hereunder which shall be caused by a Force
            Majeure Event, except to the extent that the Force Majeure Event
            requires performance of any of the Emergency Services or the DF
            Transmitted Services and except that the Force Majeure Event shall
            not excuse payment by the BBC of any of the charges for Services
            received.

     18.2   Subject to Clause 18.1 above and without prejudice to its rights
            under Clause 13.2 above, TxCo shall nevertheless use its reasonable
            endeavours to carry cut the Services while the Force Majeure Event
            subsists.

19   AMENDMENTS TO THIS AGREEMENT

     No amendment to this Agreement shall be effective unless it is in writing
     and signed by the BBC's Director of Policy and Planning and the TxCo
     Representative on behalf of both parties.

20   INFORMATION AND CONFIDENTIALITY

     20.1   The BBC will as soon as possible provide TxCo (free of charge) with
            all such information and cooperation that TxCo may reasonably
            require in accordance with any agreements for the sharing of
            services, including under the R&D Services Agreement and the
            Telecommunications Agreement, and which the BBC is able to provide
            from time to time to enable TxCo to perform its obligations under
            this Agreement.

     20.2   Subject to the terms of any other agreement between the parties,
            each party agrees and undertakes that during the term of this
            Agreement, and thereafter, it will keep confidential and will

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<PAGE>
 
            not use for its own purposes or, without the prior written consent
            of the other, disclose to any third party the terms of this
            Agreement or any information of a confidential nature which is
            supplied to it under this Agreement or of which it becomes aware in
            the performance of this Agreement unless:

            20.2.1   such information is required to be disclosed to TxCo's
                     bankers, TxCo's holding company and any shareholders of its
                     holding company (subject in each case to such companies or
                     individuals agreeing that the information shall be
                     confidential in terms substantially similar to this Clause
                     20.2); or

            20.2.2   such information is public knowledge, or subsequently
                     becomes public knowledge, other than by breach of this
                     Agreement; or 

            20.2.3   such information subsequently comes lawfully into the
                     possession of the party in question from a third party; or

            20.2.4   the disclosure of such information is required by any court
                     of competent jurisdiction or any regulatory authority,
                     including any recognised stock exchange or any taxation
                     authority.

     20.3   To the extent that it is necessary to disclose confidential
            information pursuant to the provisions of this Clause 20 or
            otherwise as necessary to implement the provisions of this
            Agreement, either party may disclose any confidential information
            concerning this Agreement, including any information contained in
            the Annexes hereof, to such, of its employees or, in the case of the
            BBC, to such of the BBC's Nominated Contractor(s) as may be
            reasonably necessary on a "need-to-know basis", provided that before
            any such disclosure such party shall make such persons aware of its
            obligations of confidentiality under this Agreement and shall at all
            times procure compliance by such persons therewith.


     20.4   The obligations of confidentiality hereunder shall not apply to
            prevent the supply of confidential information to the Department of
            National Heritage, the Home Office, the Cabinet Office, the Foreign
            and Commonwealth Office, the Office of Fair Trading, the
            Radiocommunications Agency, the Department for Trade and Industry,
            the Radio Authority, the Independent Television Commission, the
            Office of Telecommunications or such other similar regulatory body.

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<PAGE>
 
21   INTELLECTUAL PROPERTY RIGHTS

     21.1   If, in the course of or as a result of any Services provided by TxCo
            to the BBC, any of TxCo's employees or agents create any document or
            other material protected by copyright or other intellectual property
            right, it is agreed that all legal and beneficial rights in it will
            be owned by TxCo and the BBC will have no rights in it beyond a non-
            exclusive licence to make copies for internal use of any document or
            other material necessary for the purpose of making use of the
            Services provided that where such material consists of software the
            BBC will maintain not more than one backup copy or reproduction of
            the software and will ensure that such copies are kept in a locked
            cabinet at all times when not in use and do not pass outside the
            BBC's control. The BBC's Representative will sign any assignment or
            other instrument which may be reasonably necessary to give effect to
            this provision.

     21.2   If, as a result of any assistance provided by the BBC to TxCo under
            this Agreement, any of the BBC's employees or agents create any
            document or other material protected by copyright or other
            intellectual property right, it is agreed that all legal and
            beneficial rights in it will be owned by the BBC and TxCo will have
            no rights in it beyond a non-exclusive licence to make copies for
            internal use of any document or other material necessary for the
            purpose of providing the Services provided that where such material
            consists of software TxCo will maintain not more than one backup
            copy or reproduction of the software and will ensure that such
            copies are kept in a locked cabinet at all times when not in use and
            do not pass outside TxCo's control. The TxCo Representative will
            sign any assignment or other instrument which may be reasonably
            necessary to give effect to this provision.

     21.3   In the event that during the performance of their respective
            obligations under this Agreement any employees or agents of the BBC
            and TxCo jointly create any document or other material protected by
            copyright or other intellectual property right, BBC and TxCo will
            negotiate in good faith to agree the terms and conditions of
            ownership of all the legal and beneficial rights in and use of it.

     21.4   Without prejudice to Clause 4.3.3, the BBC will, subject to a limit
            on its liability of [*] in respect of any one such claim or related
            series of claims or [*] for all such claims arising in any
            jurisdiction in any 12 month period, indemnify TxCo against any
            claims, proceedings and expenses arising from infringement (or
            alleged infringement) of any patent, design, copyright or other
            intellectual property right by reason of:

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.

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<PAGE>
 
            21.4.1  work carried out by TXCO, its agents or employees in
                    accordance with directions or specifications given by the
                    BBC where and to the extent that such infringement (or
                    alleged infringement) results only from any negligent act or
                    default of the BBC or where the BBC does not inform TxCo of
                    any limitation on the use of such intellectual property
                    right;

            21.4.2  the connection of any BBC DF to the Transmission Network or
                    the use of any BBC DF in conjunction with the Transmission
                    Network where, in either case, the infringement is
                    attributable solely to the connection or use of BBC DF; or

            21.4.3  the connection of the MBN Core Network and other BBC
                    Equipment to the Transmission Network where, in any case,
                    the infringement is attributable to the connection, use or
                    maintenance of BBC Equipment or the equipment comprised in
                    the MBN Core Network.

     21.5   TxCo will, subject to a limit on its liability of [*] in respect of
            any one such claim or related series of claims or [*] for all such
            claims arising in any jurisdiction in any 12 month period, indemnify
            the BBC on an after-tax basis against any claims, proceedings and
            expenses arising in any jurisdiction from infringement (or alleged
            infringement) of any patent, design, copyright or other intellectual
            property right arising from the connection of any TxCo Equipment to
            the BBC DF or the BBC's use thereof in conjunction with the
            Transmission Network where in either case the infringement is
            attributable solely to the connection or use of TxCo Equipment.

     21.6   In respect of the indemnities given by each party in this Clause 21,
            the party entitled to claim under the indemnity (the "indemnified")
            will notify the other party (the "indemnifier") within seven days in
            writing of any allegation of infringement and the indemnified:

            21.6.1  will make no admission relating to the infringement;

            21.6.2  will allow the indemnifier full discretion to conduct or
                    settle all negotiations and proceedings, subject to
                    receiving reasonable security for costs and damages; and

            21.6.3  will give the indemnifier all reasonable assistance in
                    respect thereof.

     21.7   Both parties will endeavour not to interfere with or otherwise
            jeopardise the intellectual property rights of the other.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.

                                      65
<PAGE>
 
22   EMPLOYEES

     22.1   TERMS OF EMPLOYMENT OF EXISTING EMPLOYEES

            TxCo shall not, and shall procure that any other Relevant Employer
            shall not, without the prior consent of the BBC (which shall not be
            unreasonably withheld or delayed), vary, or purport or promise to
            vary, the terms or conditions (as amended from time to time) of
            employment of any Employee (including a promise to make any
            additional payment or provide any additional benefit) where such
            variation or addition:

            22.1.1  takes effect at any time after either party has served
                    notice pursuant to Clause 2.2 of this Agreement unless it is
                    in the ordinary course of business and, when aggregated with
                    any other variation or addition which takes effect during
                    such period, represents an increase in the remuneration of
                    the Employee of no more than the percentage increase in the
                    level of the Average Earnings Index between the month for
                    which such index was last Published at the time the
                    variation or addition is made or proposed and the month
                    falling 12 months before such month; or

            22.1.2  first takes effect in whole or in part after this Agreement
                    has terminated; or

            22.1.3  results in any such employment not being terminable by the
                    Relevant Employer within six months after the Agreement has
                    terminated; or

            22.1.4  relates to a payment or the provision of a material benefit
                    triggered by termination of employment after the Agreement
                    has terminated, or

            22.1.5  relates to the provision of a benefit (but excluding base
                    salary) which takes effect at any time after either party
                    has served notice pursuant to Clause 2.2 of this Agreement
                    or which any such Employee will or may have a contractual
                    right to first receive after the Agreement has terminated;
                    or

            22.1.6  prevents, restricts or hinders any such Employee after the
                    Agreement has terminated from working for the BBC or the
                    Successor Operator or from per-forming the duties such
                    Employee performed for TxCo.

     22.2   CHANGES IN NUMBERS AND TOTAL COST OF EMPLOYEES

            Subject to and excluding any increase in the remuneration of
            Employees permitted under Clause 22.1, TxCo shall not, and shall
            procure that any other Relevant Employer shall not, without the
            prior consent of the BBC (which shall not be unreasonably withheld
            or delayed), increase or

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<PAGE>
 
            decrease at any time after either party has served notice pursuant
            to Clause 2.2 the number of Employees either such that the total
            number of Employees or the total cost per annum to TxCo and each
            other Relevant Employer of employing all Employees is increased or
            such that the total number of Employees is decreased, in each case,
            by more than 5 per cent during any period of 12 months.

23   NOTICES

     23.1   Any notice to be served by either party shall be in writing and
            shall be sent to the following addresses:

            TxCo    Chief Executive Officer
                    Castle Transmission Services Ltd
                    Warwick Technology Park
                    Heathcote Lane
                    Warwick CV34 5DS
                    Fax No: 01926 416441.

            BBC     Director of Policy and Planning
                    British Broadcasting Corporation
                    Broadcasting House
                    London W1A 1AA
                    Fax No: 0171 436 0393

     23.2   Any notice, invoice or other document which may be given by either
            party under this Agreement will be deemed to have been duly given if
            left at or sent by post (whether by letter or, where the parties
            agree in writing, in any other form) or facsimile transmission to
            the address set out above or to any other address notified to each
            other in writing in accordance with this Clause as an address to
            which notices, invoices and other documents may be sent. Any such
            communication will be deemed to have been made to the other party:

            23.2.1  if sent by hand, when delivered;

            23.2.2  if sent by post, 72 hours after the envelope containing such
                    notice was posted; or

            23.2.3  if sent by facsimile, when the transmission of the facsimile
                    is confirmed delivered complete, if delivered on a business
                    day, or, if not, at 9.30 a.m. (British Standard Time) on the
                    next business day.

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<PAGE>
 
     For the purposes of this Clause, "business day" means 9 a.m. to 5 p.m.
     Monday to Friday every week of the year except for English public holidays,
     It is further agreed that notices sent by facsimile will also be confirmed
     by sending a signed copy by post, the copy to be posted within 24 hours of
     sending the facsimile.

24   NON-SOLICITATION

     Neither the BBC nor TxCo shall solicit or endeavour in any way to solicit
     the services of or offer employment or engage any employee of the other
     involved in the provision or monitoring of the Services or the services
     provided under the R&D Services Agreement while, engaged, or within 12
     months of his ceasing to be engaged, in carrying out any obligations under
     this Agreement without the prior written consent of the other. This
     prohibition shall not prevent either party advertising for staff in the
     national, local or industry press, or, whilst TxCo remains a subsidiary of
     the BBC, recruiting or endeavouring to recruit staff in accordance with the
     internal recruitment procedures of the BBC. If any BBC or TxCo employee
     responds to such advertisement or in accordance with the relevant BBC
     internal recruitment procedure, the relevant party can, if it wishes,
     employ such person.

25   RESTRICTIVE TRADE PRACTICES

     Notwithstanding any other provision of this Agreement, no provision of this
     Agreement which is of such a nature as to make this Agreement liable to
     registration under the Restrictive Trade Practices Act 1976 shall take
     effect until the day after that on which particulars thereof have been duly
     furnished to the Director General of Fair Trading.

26   WHOLE AGREEMENT

     This Agreement supersedes any previous written or oral agreement between
     the parties in relation to the matters dealt with in this Agreement and,
     together with its Schedules and Annexes and the Teleswitching Agreement,
     contains the whole agreement between the par-ties relating to the subject
     matter of this Agreement at the date hereof to the exclusion of any terms
     implied by law which may be excluded by contract. Each of the parties
     acknowledges that it has not been induced to enter into this Agreement by a
     representation, warranty or undertaking not expressly incorporated into it.
     So far as permitted by law and except in the case of fraud, the parties
     agree and acknowledge that their only rights and remedies in relation to
     any representation, warranty or undertaking made or given in connection
     with this Agreement shall be for breach of the terms of

                                      68
<PAGE>
 
     this Agreement, to the exclusion of all other rights and remedies
     (including those in tort, or arising under statute).

27   VALUE ADDED TAX

     27.1   All sums due to either party under this Agreement are exclusive of
            VAT thereon, if any, which shall be charged in addition thereto in
            accordance with the relevant law in force at the time of making the
            relevant taxable supply and shall be payable by the paying party
            only against receipt from the other of a valid VAT invoice in
            respect thereof.

     27.2   Where under this Agreement one party has agreed to reimburse or
            indemnify the other in respect of any payment made or cost incurred
            by the other, then the first party shall also reimburse any VAT paid
            by the other which forms part of its payment or costs incurred to
            the extent that such VAT is not available for credit for the other
            or for the representative member of the other's VAT group under
            Sections 25 and 26 of the Value Added Tax Act 1994 (or any
            replacement or equivalent provision).

28   PARENT COMPANY GUARANTEE

     Cable Transmission Services (Holdings) Limited will enter into a guarantee
     in the form set out in Schedule 11.

29   JURISDICTION

     This Agreement will be governed by and construed and interpreted in
     accordance with English law, and the parties hereby submit to the non-
     exclusive jurisdiction of the English courts.

     In witness whereof this document has been executed as a Deed the day and
     year first before written.

                                      69
<PAGE>
 
In witness whereof this document has been executed as a Deed the day and year
first before written.

THE COMMON SEAL of the BRITISH
BROADCASTING CORPORATION was
hereunto affixed in the presence of:


Director


Recorder Officer



THE COMMON SEAL of CASTLE
TRANSMISSION SERVICES LIMITED
was hereunto affixed in the presence of:



Director



Secretary

                                      70
<PAGE>
 
                                  SCHEDULE 1

[*] (represents pages 1-23)


[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  SCHEDULE 2

[*] (represents pages 24-30)

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  SCHEDULE 3

[*] (represents pages 31-40)

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  SCHEDULE 4

[*] (represents pages 41-109)

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  SCHEDULE 5

                   Fault Reporting and Planned Interruptions

                                                                        Page No.

1.   Introduction                                                         111

2.   Services Messages                                                    111

3.   Planned Work Messages                                                112

4.   Classification of Faults                                             113

5.   Response Times                                                       114

6.   Interleaved DAB and VHF Antennas                                     115

7.   Service Codes                                                        115
<PAGE>
 
                                  SCHEDULE 5

[*] (represents pages 111-121)

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  SCHEDULE 6

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  SCHEDULE 7

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  SCHEDULE 8

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  SCHEDULE 10

[*] (represents pages 144-189)

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                 SCHEDULE 11
 
                    Dated                     February 1997





                CASTLE TRANSMISSION SERVICES (HOLDINGS) LIMITED


                                      and


                     THE BRITISH BROADCASTING CORPORATION



                               DEED OF GUARANTEE



                              LINKLATERS & PAINES
                               Barrington House
                             59-67 Gresham Street
                                London EC2V 7JA

                              Tel:  0171-606 7080

                                   JMC/KMTM
<PAGE>
 
     THIS DEED OF GUARANTEE ("GUARANTEE") is made the          day of February 
     1997 BETWEEN:

     (1)  CASTLE TRANSMISSION SERVICES (HOLDINGS) LIMITED, a company
          incorporated on 27 August 1996 (with registration number 3242381) and
          whose registered office is at Kempson House, Camomile Street, London
          EC3A 7AN (the "GUARANTOR"); and

     (2)  THE BRITISH BROADCASTING CORPORATION, a corporation incorporated under
          Royal Charter, whose principal office is at Broadcasting House,
          Portland Place, London W1A 1AA (the "BBC").

     WHEREAS:

     (A)  Castle Transmission Services Limited ("CTS") is a company incorporated
          on 9 May 1996 (with registration number 3196207) and whose registered
          office is at Barrington House, 59-67 Gresham Street, London EC2V 7JA.

     (B)  By an agreement (the "SALE AGREEMENT") of 23 January 1997 and made
          between the BBC as seller and Castle Transmission Services (Holdings)
          Limited as purchaser, the BBC has agreed to sell and Castle
          Transmission Services (Holdings) Limited agreed to buy the entire
          share capital of CTS.

     (C)  By an agreement (the "TRANSMISSION AGREEMENT") of February 1997
          between the BBC and CTS, CTS has agreed to provide certain
          transmission and related services to the BBC.

     (D)  CTS is a wholly owned subsidiary company of the Guarantor as defined
          in the Companies Act 1985.

     (E)  In consideration, inter alia, for the entry of the BBC into the Sale
          Agreement, the Guarantor has agreed to guarantee (upon and subject to
          the terms set out in this Guarantee) the due performance and
          observance by CTS of all its obligations under the Transmission
          Agreement.

     IN CONSIDERATION of the BBC having agreed to enter into the Sale Agreement,
     IT IS HEREBY AGREED as follows:

 1   DEFINITIONS

     In this Guarantee terms and expressions defined in the Transmission
     Agreement shall, save where the context otherwise requires, have the same
     meanings herein.

 2   GUARANTEE OF PERFORMANCE

2.1  The Guarantor hereby unconditionally and irrevocably guarantees to the BBC
     the due and punctual performance and observance by CTS of all the
     obligations of CTS under and pursuant to the Transmission Agreement and
     agrees to indemnify the BBC (on an after tax basis) against all losses,
     liabilities, costs, charges, expenses, actions, proceedings, claims and
     demands which the BBC may suffer through or arising from any breach by CTS
     of its obligations under and pursuant to the Transmission Agreement.
     Without prejudice to the provisions of Clause 3 of this Guarantee, the
     amount which the BBC shall be entitled to recover from the Guarantor
     hereunder in respect of or arising from any breach or default by CTS in the
     performance of its obligations or liabilities under or pursuant to the
     Transmission Agreement shall not exceed the amount for which CTS itself is
     or would be liable in respect of such breach or default, save that the
     foregoing limitation does not apply in respect of costs and expenses
     incurred by the BBC in enforcing the Guarantor's obligations under this
     Guarantee.

2.2  If and whenever CTS defaults for any reason whatsoever in the performance
     of any obligation or liability undertaken or expressed to be undertaken by
     it under or pursuant to the Transmission Agreement, the Guarantor shall
     upon demand perform (or procure performance of) and satisfy (or

                                       1
<PAGE>
 
procure the satisfaction of) the obligation or liability in regard to which such
default has been made in the manner prescribed in the Transmission Agreement and
so that the same benefits shall be conferred on the BBC as it would have
received if such obligation had been duly performed and satisfied by CTS.

3    PRIMARY OBLIGATION

3.1  The Guarantor is deemed to be a principal debtor in respect of its
     obligations under this Guarantee and not merely a surety and accordingly
     shall not be discharged nor shall its liability be affected by any act,
     omission or means whereby it would not have been discharged or its
     liability would not have been affected if it had been a principal debtor.

3.2  The BBC shall not be obliged, before enforcing this Guarantee, to have:

     3.2.1  taken any action or proceedings against CTS; or

     3.2.2  obtained any judgment against CTS; or

     3.2.3  proven in any winding-up of CTS or agreed with CTS (or any
            administrator, liquidator, receiver or similar person) the amount of
            any liability of CTS, to the BBC; or

     3.2.4  enforced any other security held by it in respect of the obligation
            of CTS under the Transmission Agreement; or

     3.2.5  exercised, levied or enforced any distress, diligence or other
            process of execution against CTS.

3.3  This Guarantee shall be in addition to, and not in substitution for, any
     rights or remedies that the BBC may have against CTS, arising under or in
     respect of the Transmission Agreement or otherwise and may be enforced
     without first having recourse to any such rights.

3.4  The liability of the Guarantor under this Guarantee shall not be diminished
     by any matter (including without limitation any amendment to or variation
     of the Transmission Agreement, or any assignment of this Guarantee or any
     administration or winding-up order) that might restrict the ability of the
     BBC to bring any action or proceedings against CTS.

4    CONTINUING GUARANTEE

4.1  This Guarantee shall be a continuing guarantee and shall continue in force
     and  effect irrespective of the enforceability of any other provision of
     the Transmission Agreement.

4.2  Neither the winding-up, liquidation, dissolution, bankruptcy or any other
     disability, limitation, incapacity, event or circumstance in relating to
     the Guarantor or CTS nor any change in their respective certificates of
     incorporation, memorandum and articles of association, status, function,
     control or ownership shall terminate the liability under this Guarantee.

4.3  This Guarantee shall terminate when all obligations to be performed or
     discharged by CTS under the Transmission Agreement have been irrevocably
     performed or discharged.

4.4  This Guarantee is in addition to and without prejudice to and not in
     substitution for or derogation of any other rights or security held by the
     BBC or any person for whose benefit this Guarantee is given in respect of
     the performance and observance of the obligations of CTS under the
     Transmission Agreement and shall extend to any costs, charges and expenses
     reasonably incurred by the BBC in enforcing or seeking to enforce this
     Guarantee.

                                       2
<PAGE>
 
5    REPRESENTATIONS AND WARRANTIES

     The Guarantor hereby represents and warrants to the BBC that:

5.1  it has an issued and fully paid-up share capital of at least (pounds) 102
     million;

5.2  it has the power to enter into, perform and comply with all of its
     obligations under this Guarantee;

5.3  the execution and performance of this Guarantee does not breach its
     constitutional documents or any agreement by which it is bound;

5.4  this Guarantee has been duly authorised by it and all necessary consents
     and authorisations required by it in relation to this Guarantee have been
     obtained and are in force; and

5.5  all other actions, conditions and things required to be taken, fulfilled
     and done in order to enable it lawfully to enter into and exercise its
     rights and perform and comply with its obligations under this Guarantee,
     have been taken, fulfilled and done.

6    ASSIGNMENT AND SUCCESSORS

6.1  The BBC shall be entitled to assign the benefit of this Guarantee to any
     firm, person or company to whom or to which the BBC shall make an
     assignment of its interest under the Transmission Agreement;

6.2  The Guarantor shall not assign or otherwise transfer, dispose of or part
     with any of its rights or obligations under this Guarantee to any person or
     deal in any other manner with this Guarantee without the prior written
     consent of the BBC. Any purported assignment in violation of this sub-
     Clause 6.2 shall be ineffective.

7    JURISDICTION

7.1  Other than as set out above this Guarantee will be governed by and
     construed and interpreted in accordance with English law, and the parties
     will be subject to the non-exclusive jurisdiction of the English courts.

8    NOTICES

8.1  Any notice to be served by either party shall be in writing and shall be
     sent to the following addresses:

     Guarantor  Castle Transmission Services (Holdings) Limited
                  c/o Castle Tower Corporation
                  510 Bering Drive, Suite 310
                  Houston
                  Texas 77057
                  USA
                  Fax: + 1 713 974 1926
                  Attention: Ted B. Miller Jr

                  with a copy to:-

                                       3
<PAGE>
 
                  Norton Rose
                  Kempson House
                  P O Box 750
                  Camomile Street
                  London EC3A 7AN
                  Fax: 0171 283 6500
                  Attention: Alan Crookes

     BBC          British Broadcasting Corporation
                  Broadcasting House                               
                  Portland Place                                   
                  London W1A 1AA                                   
                  Fax: 0171 765 3500                               
                  Attention: Bob Phillis - Deputy Director General 
                                                                   
                  with a copy to:-                                 
                                                                   
                  British Broadcasting Corporation                 
                  Broadcasting House                               
                  Portland Place                                   
                  London W1A 1AA                                   
                  Fax: 0171 765 4381                               
                  Attention: Gareth Roscoe - Legal Adviser          

8.2  Any notice, invoice or other document which may be given by either party
     under  this Guarantee will be deemed to have been duly given if left at or
     sent by post (whether by letter or, where the parties agree in writing, in
     any other form) or facsimile transmission to the address set out above or
     to any other address notified to each other in writing in accordance with
     this clause as an address to which notices, invoices and other documents
     may be sent. Any such communication will be deemed to have been made to the
     other party.

     8.2.1  if sent by hand, when delivered;

     8.2.2  if sent by post, 72 hours after the envelope containing such notice
            was posted; or

     8.2.3  if sent by facsimile, when the transmission of the facsimile is
            confirmed delivered complete (if delivered on a business day) or if
            not at 9:30 a.m. (British Standard Time) on the next business day.

     For the purposes of this Clause business day means 9 a.m. to 5 p.m. Monday
     to Friday every week of the year except for English public holidays. It is
     further agreed that notices sent by facsimile will also be confirmed by
     sending a signed copy by post, the copy to be posted within 24 hours of
     sending of the facsimile.

                                       4
<PAGE>
 
     IN WITNESS whereof this document has been executed as a deed on the day and
     year first before written.

 
SIGNED AS A DEED BY                    )
CASTLE TRANSMISSION SERVICES           ) 
(HOLDINGS) LIMITED ACTING BY           )
 
Director                               )
 
                                                 
and                                    )
 
 
Director/Secretary



SIGNED BY                              
 
 
for and on behalf of                   )
THE BRITISH BROADCASTING               )
CORPORATION                            )

                                       5
<PAGE>
 
                                  SCHEDULE 12

[*] (represents pages 192-285)

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                    ANNEX 2

[*] (represents pages 1-12)

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  Appendix 1

              Population Coverage Figures for the UHF Television
                             Transmission Network

[*] (represents pages 1-11)

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  Appendix 2

                 Population Coverage Figures for the FM Radio
                             Transmission Network

                    (National, Regional and Local Services)

[*] (represents pages 1-7)

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  Appendix 3

                    Population Coverage Figures for the DAB
                             Transmission Network

                               (27-Station Plan)

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  Appendix 4

                Population Coverage Figures for the LF/MF Radio
                       Transmission Network for Radio 4

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                  Appendix 5

                 Population Coverage Figures for the MF Radio
                     Transmission Network for Radio 5 Live

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.

<PAGE>
 
                                                                   EXHIBIT 10.33

                            DATED 10 February 1998



                   (1) THE BRITISH BROADCASTING CORPORATION


                                      and


                   (2) CASTLE TRANSMISSION INTERNATIONAL LTD



                        DIGITAL TERRESTRIAL TELEVISION
                            TRANSMISSION AGREEMENT



                              LINKLATERS & PAINES

                                One Silk Street
                                London EC2Y 8Q

                              Tel: 0171-456 2000

                                Ref:  RMBD/MSHC
               
<PAGE>
 
THIS AGREEMENT is made on 10 February 1998 BETWEEN:

(1)   THE BRITISH BROADCASTING CORPORATION, a corporation incorporated under
      Royal Charter, whose principal office is at Broadcasting House, Portland
      Place, London W1A 1AA ("THE BBC"); and
    
(2)   CASTLE TRANSMISSION INTERNATIONAL LTD (registered number 3196207), a
      company incorporated under the laws of England and Wales whose principal
      place of business is Warwick Technology Park, Gallows Hill, Heathcote
      Lane, Warwick CV34 6TN ("CTI").

RECITALS

(A)   The BBC is incorporated under the Charter and required under the Charter
      and DNH Agreement to provide radio and television broadcasts.
    
(B)   Clause 2.4 of the DNH Agreement allows for the BBC to provide multiplex
      facilities for digital terrestrial television.
    
(C)   The BBC wishes to launch its digital terrestrial television services
      concurrently with the launch of digital terrestrial television services by
      other multiplex operators.

(D)   The BBC has decided that it wishes to obtain from CTI the Services,
      including:

(i)   The DTT Transmission Services using:

      (a)  terrestrial transmitters operated by CTI which radiate DVB-T
           Specification compliant signals;

      (b)  links provided by or to CTI to enable distribution of the BBC
           multiplexed signal to terrestrial transmitter sites from nominated
           BBC broadcast centers;

      (c)  multiplexers provided by CTI, to enable configuration of the BBC
           Multiplex at certain transmitter sites;

(ii)  modifications to the transmission characteristics of existing analogue
      transmitters to permit the introduction of the BBC Multiplex and the
      simultaneous transmission of analogue services;

(iii) representation of the BBC on industry bodies; and

                                       1
<PAGE>
 
          (iv) liaison with the analogue returning contractor.

(F)  CTI has agreed to provide the Services on the terms and conditions set out
     in this Agreement.

The parties agree to comply with the following terms and conditions.

                                       2
<PAGE>
 
                    PART A - DEFINITIONS AND INTERPRETATION

1    DEFINITIONS AND INTERPRETATION

1.1  In this Agreement:

     "ACCEPTANCE TESTS" means the tests carried out to test the installation and
     implementation of a Station (which may include type approval tests) in
     accordance with Clause 2.7 and Schedule 6.

     "ACCEPTED" shall mean acceptance by the BBC or deemed acceptance by the BBC
     of a Station in accordance with the Acceptance Test procedure.

     "ACCOUNTABLE INCIDENT" means a fault, failure or incident of the kind
     defined in Schedule 8, paragraph 3.1.4.2.

     "ACTUAL IN-SERVICE DATE" means the date, regardless of the Roll-out Plan,
     when a Station commences service other than for testing.

     "AFFILIATE" means any undertaking in respect of which a participating
     interest is held by the BBC, or a subsidiary undertaking of the BBC, or its
     parent undertaking or any subsidiary undertaking of its parent undertaking
     (as such terms are defined in sections 258 to 260 and Schedule 9 of the
     Companies Act 1985, as amended by the Companies Act 1989).

     "AVERAGE EARNINGS INDEX" means the average earnings index for the whole
     United Kingdom economy as published from time to time by the Office of
     National Statistics or, if such index shall cease to be published or if
     there is a material change in the basis of the index, such other average
     earnings index as is an equivalent replacement, or if there is not a
     replacement, as the BBC may, after consultation with CTI, reasonably
     determine to be appropriate in the circumstances.

     "1996 ACT" means the Broadcasting Act 1996.

     "BBC ASSIGNEE" means any wholly-owned subsidiary of the BBC to whom the BBC
     has assigned this Agreement pursuant to Clause 17.2.

     "BBC MULTIPLEX" means the multiplex for digital terrestrial television
     allocated to the BBC by the Secretary of State.

     "BBC OPERATIONAL POINT OF CONTACT" means a person or persons nominated to
     CTI by the BBC from time to time as the operational point(s) of contact for
     purposes of this Agreement.

                                       3
<PAGE>
 
     "BBC REPRESENTATIVE" means a person or persons nominated in writing to CTI
     by the BBC from time to time to be its contractual point of contact. The
     initial BBC Representative will be Mark Evans.

     "BBC R & D" means the BBC's Research and Development Department.

     "BBC SITES" means all sites owned by, leased or licensed to the BBC.

     "BROADCASTING ACT" means the Broadcasting Act 1990.

     "BUILD DATE" means, in relation to a Station:

          (i)  for Phase 1 Stations the date by which the Station is able to
               radiate DTT signals compliant with the relevant technical
               specification approved by the BBC as set out in Schedule 12,
               Appendix 3; and

          (ii) for Phase 2 Stations and Phase 3 Stations the date by which:

               (a)  all digital equipment at that Station has been installed by
                    CTI, tested and Accepted;

               (b)  all the analogue consequential changes at that Station are
                    complete and accepted by the BBC;

               (c)  all analogue consequential changes required for that
                    Station, which are not directly linked to the analogue
                    returning contract, are completed;

               (d)  a detailed project plan for those analogue changes directly
                    linked to the analogue returning contract has been agreed
                    with the returning contractor and the BBC.

     "CA" means conditional access.

     "CHANGE CONTROL PROCEDURE" means the procedure set out in Schedule 3.

     "CHARGES" means charges calculated in accordance with Schedule 2.

     "CHARTER" means the Charter granted to the BBC by Her Majesty the Queen in
     Council on 13 March 1996 which came into force on 1 May 1996, as amended or
     replaced from time to time.

     "CTI ASSIGNEE" means any person, firm or company to whom CTI has assigned
     this Agreement pursuant to Clause 17.2.

                                       4
<PAGE>
 
     "CTI REPRESENTATIVE" means a person or persons nominated in writing to the
     BBC by CTI from time to time to be its contractual point of contact.

     "CTI SITE" means all sites owned by, leased or licensed to CTI, other than
     sites licensed to CTI by the BBC under a Site Sharing Agreement as defined
     in this or the Analogue Contract.

     "CTI SUB-CONTRACTOR" has the meaning given in Clause 13.5.1.

     "DATA" means, subject to the limit on total capacity described in Clause
     4.2.4, any data, free-to-air or subscription programming or other material
     which the BBC wishes to broadcast or transmit using the BBC Multiplex from
     time to time, which may include without limitation:

     (a)  digitally coded audio and video programme services;

     (b)  services such as Teletext, Audetel, subtitling and any other similar
          services provided by the BBC from time to time;

     (c)  information relating to or intended for viewer set-top boxes;

     (d)  subtitling;

     (e)  private data signals (including EPG and CA);

     (f)  SI; and

     (g)  any television channels that the BBC wishes to provide for digital
          television transmission from time to time.

     "DESIGN AND OPTIMIZATION CONSULTING SERVICES" means technical advice and
     consultation, provided prior to the Phase I Launch Date, in order to
     optimize the coverage and capability of the Transmission Network, including
     Sl interface design and the enhancement of antenna patterns.

     "D-MUX GROUP" means the industry group of licensees of digital television
     multiplexes under the 1996 Act and includes the BBC.

     "DISTRIBUTION LINKS" means the telecommunications services procured or
     provided by CTI to convey the Data from the Interfaces to the Stations, as
     described in Schedule 5.

     "DNH AGREEMENT" means the agreement between the Secretary of State of the
     then Department of National Heritage and the BBC dated 25 January 1996
     which came into force on 1 May 1996, as such agreement may from time to
     time be amended or replaced. 

                                       5
<PAGE>
 
     "DTT" means digital terrestrial television.

     "DTT TRANSMISSION SERVICE" means digital terrestrial television
     transmission of the Data from the Stations using the BBC Multiplex in
     accordance with the Transmission Requirements by means of the Transmission
     Network.

     "DVB-T SPECIFICATION" means ETS1 standard ETS 300744.

     "EFFECTIVE DATE" means the date on which the Department of Culture, Media
     and Sport gives formal approval for the BBC to provide DTT.

     "EMERGENCY ANNOUNCEMENTS" means the provision by the BBC as required by
     Clause 8.1 of the DNH Agreement of announcements or other matter from all
     or any of the Stations.

     "EMERGENCY POWERS" means powers exercisable by a Minister of the Crown
     pursuant to any legislation enacted or made to deal with a public
     emergency, including the Emergency Powers Act 1920 and any regulations made
     under it.

     "EMERGENCY SERVICES" means the services described in Clause 3.2.

     "EMPLOYEES" means the employees of CTI (or any sub-contractor of CTI) from
     time to time principally employed for the purposes of performing CTI's
     obligations under this Agreement or the employees of any CTI Assignee from
     time to time principally employed for the purposes of performing CTI's
     obligations under this Agreement.

     "ENGINEER RESPONSE TIME" has the meaning set out in Schedule 8.

     "EPG" means electronic programme guide.

     "FORCE MAJEURE EVENT" means any events or circumstances beyond the
     reasonable control of the defaulting party which cause the relevant default
     which shall include, but not be limited to, Act of God, war, civil
     disturbance, statutory prohibition, Government intervention, order or act
     of Government or local/public authority, supranational regulatory or
     governmental agencies, acts or threats of terrorism, fire, lightning,
     flood, any adverse weather conditions which cause physical damage to
     property used to supply the Services or prevent access or safe working on
     any such property, anomalous propagation or other adverse weather
     conditions which affect transmission of the signal after it leaves the
     transmitter at a Station and before it is received at a viewer's receiver
     (but not anomalous propagation or other adverse weather conditions which
     affect transmission of the signal from the Interface up to and including
     the point at which the signal is

                                       6
<PAGE>
 
     radiated from the transmitter except where weather conditions prevent or
     impede access to or safe working on any property), explosion, accident,
     theft or vandalism, national strike action or industrial action taken by a
     union or the BBC provided that neither party can rely on strikes,
     industrial action, theft or acts of vandalism where it could reasonably
     have been expected to have prevented them or the industrial action or
     strike is by its own employees only.

          "GRADED BROADCAST" means:

          (a)  broadcasts of announcements made by a member of the royal family;
               and

          (b)  major outside broadcasts,

          as notified to CTI by the BBC in accordance with Clause 10.4.1, and
          any urgent broadcasts of a similar nature as notified to CTI by the
          BBC from time to time in accordance with Clause 10-4.

          "HARMFUL INTERFERENCE" shall have the same meaning as in the Radio
          Regulations.

          "HIGH LEVEL DESIGN" means a high level block diagram in the form set
          out in Schedule 12, identifying all Interfaces and Interface
          protocols.

          "INTERFACE" means the network interconnection points between the BBC's
          facilities and the Transmission Network as more fully described in the
          Interface Specification.

          "INTERFACE SPECIFICATION" means the specification set out in Schedule
          7.

          "ITC" means the Independent Television Commission.

          "JOINT FREQUENCY PLANNING BOARD" means the board of that name formed
          under the auspices of the Radiocommunications Agency.

          "LIQUIDATED DAMAGES" means amounts payable under Clause 16.6 and
          calculated in the manner set out in Schedule 2.

          "LOSSES" means all losses, liabilities, costs (including, without
          limitation, legal costs), expenses and damages.

          "MAIN STATIONS" means Stations which are not Relay Stations.

          "MILLENNIUM COMPLIANT" means neither the performance nor the
          functionality of the Services will be affected by any changes to the
          date format caused by the advent of the year 2000 or any dates
          thereafter. In particular:

                                       7
<PAGE>
 
          (a)  no value for current date will cause any interruption of the
               Services;

          (b)  all manipulation of time related data will produce the desired
               results for valid date values within the application domain;

          (c)  date elements in Interfaces and data storage will permit
               specifying the century to eliminate date ambiguity; and

          (d)  where any data element is represented without a century, the
               correct century shall be unambiguous for all manipulations
               involving that element.

          "OPERATOR" means the BBC and/or any Successor Operator.
          "OPERATIONAL" means, in relation to a Station, that the relevant
          Station is ready for Operational use; i.e.:

               (i)   the Build Date has been achieved;

               (ii)  end-to-end system integration testing is complete;

               (iii) all analogue consequential changes required for that
                     Station are complete.

          "OPERATIONAL NON-PRIORITY STATIONS" means those Stations which are
          described as not being Operational Priority Stations in Schedule 1 as
          amended from time to time in accordance with the Change Control
          Procedure.

          "OPERATIONAL PRIORITY STATIONS" means those Stations described as
          Operational Priority Stations in Schedule 1 as amended from time to
          time in accordance with the Change Control Procedure.

          "PERFORMANCE MEASURES" means the numerical indications of CTI's
          overall performance, calculated as set out in Schedule 8.

          "PERFORMANCE STANDARDS" means the performance parameters to be applied
          by CTI as set out in Schedule 8.

          "PHASE 1" means the dates during which roll-out of the Stations
          identified in Schedule 1 (or otherwise agreed between the parties
          pursuant to this Agreement) as first phase Stations takes place.

          "PHASE 1 LAUNCH DATE" means the date by which Phase 1 Stations are
          Operational, being 1 November 1998 (or such other later date as is
          specified by the D-Mux Group).

                                       8
<PAGE>
 
     "PHASE 2" means the period during which roll-out of the Stations identified
     in Schedule I (or otherwise agreed between the parties pursuant to this
     Agreement) as second phase Stations takes place.

     "PHASE 2 SERVICE DATE" means, in relation to a Phase 2 Station, the date by
     which that Station is Operational, as specified in Schedule 1 hereto (or as
     otherwise agreed between the parties).

     "PHASE 3" means the period during which roll-out of the Stations identified
     in Schedule 1 (or otherwise agreed between the parties pursuant to this
     Agreement) as third phase Stations takes place.

     "PHASE 3 SERVICE DATE" means, in relation to a Phase 3 Station, the date by
     which that Station is Operational, as specified in Schedule 1 hereto (or as
     otherwise agreed between the parties).

     "PLANNED INTERRUPTIONS" means any interruptions of the kind described in
     Clauses 10-2.1 and 10.2.2.

     "PLANNED WORK MESSAGE" means a message where there is a Planned
     Interruption to the DTT Transmission Service.

     "PROJECT MANAGER" has the meaning set out in Clause 5.3.2.

     "RADIO REGULATIONS" means the Radio Regulations of the International
     Telecommunication Union or any replacement for such regulations and
     includes all related regional agreements.

     "RELAY STATIONS" means stations defined as such in Table 1 of Schedule 1.

     "RELEVANT EMPLOYEES" means all Employees employed immediately before the
     Transfer Date (whether employed by CTI or otherwise) whose contract of
     employment has been or is to be transferred to the BBC or, as the case may
     be, a Successor Operator by virtue of the operation of law (including the
     Transfer Regulations) or any other person so employed in respect of whom
     liabilities arising from a contract of employment or employment
     relationship have or will be transferred by virtue of the operation of law
     (including the Transfer Regulations).

     "RELEVANT EMPLOYER" means an employer of any of the Employees or the
     Relevant Employees.

     "ROLL-OUT PLAN" means the industry-agreed plan for the roll-out of the
     second and third phases of DTT, as notified to CTI and amended by the D-Mux
     Group from time to time.

                                       9
<PAGE>
 
     "ROUTINE MAINTENANCE" means work or repairs that are planned by CTI to
     minimize faults on CTI equipment and/or the Transmission Network and to
     ensure that such equipment and the Transmission Network operates safely,
     complies with all applicable statutory requirements and meets the
     Transmission Requirements and Target Performance Measures.

     "RPI" means the retail price index (all items) published monthly in the
     Digest of Statistics by the Central Statistical Office or, if such index
     shall cease to be published, such other index of retail prices published in
     substitution for it.

     "THE SECRETARY OF STATE" means one of Her Majesty's Principal Secretaries
     of State.

     "SERVICES" means all services provided by CTI under this Agreement.

     "SERVICE CREDITS" means credits against Charges in respect of CTI failing
     to meet the relevant Target Performance Measures calculated in accordance
     with Clause 11.3 and Schedule 8.

     "SERVICE MANAGEMENT BOARD" means the committee described in Clause 5.4.

     "SERVICE MESSAGE" means a message of the kind described in Schedule 8.

     "SERVICES MANAGER" has the meaning set out in Clause 5.3.2.

     "SI" means service information.

     "SLA" means the service level agreement or agreements described in Clause
     5.1 .1.

     "SITE SHARING AGREEMENT" means an agreement substantially in the form of
     Schedule 10 or  in such other form as is acceptable to the BBC.

     "STATIONS" means the transmitter sites listed in Schedule 1 as amended from
     time to time and any substitute or additional transmitter sites that the
     parties may agree from time to time, in accordance with the Change Control
     Procedure.

     "SUCCESSOR OPERATOR" means the contractor first succeeding CTI in the
     provision or operation of all or any of the Services.

     "TARGET PERFORMANCE MEASURE" means the Performance Measure which is
     required for the DTF Transmission Service as described in Schedule 8.

     "TECHNICAL OPERATIONS CENTRE" ("TOC") means CTI's principal operations
     centre located at Warwick Technology Park, Gallows Hill, Heathcote Lane,
     Warwick CV34 6TN.

                                      10
<PAGE>
 
     "TELECOMS ACT" means, in relation to the UK, the Telecommunications Act
     1984 or such equivalent statutes as are from time to time in force in the
     Channel Islands or the Isle of Man.

     "TELETEXT" means any data service of the type which is currently
     transmitted using lines in the vertical blanking interval of the vision
     element of analogue television signals directed to the general public.

     "TERM" means the period of 12 years from the Phase 1 Launch Date.

     "TEST DATE" means, in relation to a Station, the date by which the relevant
     test transmitter or transmitter, as the case may be, is installed and ready
     for testing on such other date as may reasonably be agreed between the BBC
     and CTI in accordance with the requirements of the D-mux Group.

     "TPGD" means the Television Planning Group Digital of the ITC.

     "TRANSFER DATE" means close of business on the date when this Agreement
     terminates.

     "TRANSFER REGULATIONS" means the Transfer of Undertakings (Protection of
     Employment) Regulations 1981.

     "TRANSMISSION FAULTS" means breaks, discontinuances or other impairments of
     the transmission of the Data.

     "TRANSMISSION NETWORK" means all or such parts of the transmission system
     which are used to provide the DTT Transmission Service, including
     transmitters and related equipment at such of the Stations as have been
     Accepted, and any Distribution Links that are used to provide the DTT
     Transmission Service.

     "TRANSMISSION REQUIREMENTS" means the BBC's requirements for transmission
     of DTT by CTI as specified in Schedule 5, to be carried out by CTI in
     accordance with the provisions of Schedule 12.

     "VAT" means value added tax as currently charged under the Value Added Tax
     Act 1994 and any successor or replacement thereof and any similar tax
     chargeable under the laws of the United Kingdom or any other jurisdiction.

     "WTA" means the Wireless Telegraphy Acts 1949-1967 or such equivalent
     statutes as are from time to time in force in any of the United Kingdom,
     the Channel Islands or the Isle of Man.

                                      11
<PAGE>
 
     "YEAR" means the period from the date of execution of this Agreement to the
     first anniversary of that date (which constitutes the first Year), and each
     subsequent complete period of twelve months.

1.2  The expressions "THE BBC" and "CTI" include their respective permitted
     assigns, employees and agents.

1.3  Other than in Clause 12.7 or otherwise expressly stated in this Agreement,
     any reference to any Act of Parliament will be deemed to include any
     replacement or re-enactment for the time being in force and to include any
     by-laws, statutory instruments, licences, rules, regulations, orders,
     notices, directions, consents or permissions made under such Act and any
     condition attaching thereto. Any reference to a reference document shall be
     to one of the reference documents listed in Schedule 13, in its version at
     the date hereof or as otherwise reasonably agreed between the parties.

1.4  The headings in this Agreement are for ease of reference only and will not
     be taken into account in the construction or interpretation of any
     provision to which they refer.

1.5  The invalidity or unenforceability of any individual provision(s) of this
     Agreement shall not affect any other provision herein or render this
     Agreement invalid or unenforceable.

1.6  This Agreement is made between principals and it shall not be deemed to
     create any partnership between the parties and neither shall hold itself
     out as agent or partner of the other except as specifically contemplated
     under this Agreement.

1.7  In the event of any inconsistency between the general provisions of this
     Agreement and any of the provisions contained in any of the Schedules or
     attachments to this Agreement or to documents or agreements referred to in
     this Agreement the provisions of this Agreement shall take precedence to
     the extent of the inconsistencies.

1.8  Failure by either party to exercise any right conferred by this Agreement
     will not be deemed to be a waiver of any such right nor operate so as to
     bar the exercise or enforcement thereof or of any right on any other
     occasion.

1.9  Except to the extent that the context otherwise requires, words and
     expressions defined in Article 1 of the Radio Regulations shall have the
     same meanings in this Agreement,

1.10 This Agreement shall come into force on the Effective Date.

                                      12
<PAGE>
 
                   PART B - DESIGN AND IMPLEMENTATION PHASE

2    DESIGN AND ROLL-OUT

2.1  Subject to the provisions of this Agreement, it is the responsibility of
     CTI as from the Effective Date to provide the Design and Optimization
     Consulting Services and to ensure that the Transmission Network is
     supplied, operated, installed and maintained in a manner which allows
     supply of the DTT Transmission Services in accordance with the terms of
     this Agreement. CTI acknowledges that the BBC has no obligation to make any
     contribution to the capital cost of the Transmission Network or to the
     costs of maintaining or operating the Transmission Network.. This Clause
     2.1 does not affect the obligations of the BBC to make any payments
     expressly provided for in, or envisaged by, this Agreement.

2.2  TEST TRANSMITTERS

     2.2.1     CTI shall install the test transmitters at the Stations specified
               in Schedule 1 by the Test Dates.

     2.2.2     CTI has submitted to the BBC a High Level Design for each of the
               test transmitters. As these transmitters will be test
               transmitters, the BBC acknowledges that the designs may not be
               complete. Subject to Clause 2.2.3, each High Level Design must
               comply with the Transmission Requirements.

     2.2.3     It is acknowledged by the BBC and CTI that the High Level Design
               is based on information, data and documentation produced and/or
               approved by the Joint Frequency Planning Board. Accordingly, if,
               notwithstanding CTI's compliance with the High Level Design, CTI
               does not comply with the Transmission Requirements through no
               fault of CTI's, CTI shall not be in breach of this Agreement in
               consequence thereof and any material costs of overcoming a
               failure of the High Level Design to comply with the Transmission
               Requirements shall be for the account of the BBC.

     2.2.4     The test transmitters must be installed so that they comply with
               the radio frequency parameters set out in Schedule 1, Schedule 5,
               the technical parameters in Schedule 8 and the provisions of
               Schedule 12. Distribution Links and multiplex facilities will not
               be required, except as may be agreed between the BBC and CTI. The
               BBC and CTI will negotiate in good faith to agree what other
               requirements the test transmitters will be required to meet.

                                      13
<PAGE>
 
     2.2.5     CTI must provide the BBC with such access to the test
               transmitters as may be reasonably required as soon as they are
               available, and in any event by the Test Dates, for the purpose of
               inspecting the transmitters and conducting or participating in
               the conduct of test broadcasts. CTI must perform such test
               broadcasts and such other tests using the test transmitters as
               the BBC reasonably requires. The BBC will provide such material
               for test broadcasts by CTI as it considers reasonably
               appropriate. Further detail of the tests to be conducted will be
               reasonably agreed in good faith between the parties.

2.3  FIRST PHASE ROLL-OUT

     2.3.1     CTI must provide the BBC with such access to each of the Phase 1
               Stations and all such information as is reasonably required (and
               which CTI is not prevented by statute, regulation or obligation
               of confidentiality from supplying) in order for the BBC to
               satisfy itself that CTI has complied with its obligations under
               Clause 2.1.

     2.3.2     The Phase 1 Launch Date shall be 1 November 1998, being the same
               as the industry launch date for DTT in the UK (the "Phase 1
               Launch Date"). [*]

     2.3.3     [*]

     2.3.4     [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      14
<PAGE>
 
2.4  SUBSEQUENT ROLL-OUT

     2.4.1     [*]

     2.4.2     For the avoidance of doubt, the BBC will not be obliged to pay
               any additional amounts and in appropriate circumstances may
               receive a reduction in the Charges (to be agreed pursuant to
               Change Control) as a result of any changes to the Roll-out Plan
               (whether they result in a reduction in the number of Stations or
               change the timing of roll-out) to the extent that such changes
               are required or permitted by the ITC in relation to any DTT
               multiplex licensee. This clause will not require CTI to increase
               the number of Stations without a change in the Charges.

     2.4.3     If the BBC wishes during the Term to acquire DTT Transmission
               Services from the Subsequent Stations, it will acquire such
               services from CTI in accordance with this Clause 2.4.

     2.4.4     CTI must comply with the Roll-out Plan in relation to the
               Subsequent Stations.

     2.4.5     CTI must provide the BBC with such access to each of the
               Subsequent Stations and all such information as is reasonably
               required (and which CTI is not prevented by statute,

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      15
<PAGE>
 
regulation or third party confidentiality obligations from supplying) in order
for the BBC to satisfy itself that CTI has complied with its obligations under
Clause 2.4.4.

2.5  DELAY

     2.5.1     Without prejudice to CTI's obligations under this Agreement, if
               any event occurs which causes or is likely to cause delay in the
               installation of any transmitter (including test transmitters) or
               if CTI is unable or likely to be unable to meet the Phase 1
               Launch Date or the Phase 2 or Phase 3 Service Dates (as the case
               may be), it must notify the BBC of the delay, giving reasons for
               it and specifying the likely period of the delay.

     2.5.2     If the event notified by CTI under Clause 2.5.1 is:

        (i)    a Force Majeure Event;

        (ii)   a breach of this Agreement by the BBC;

        (iii)  delays caused by CTI carrying out work to modify analogue
               transmitters other than as set out in Schedule 4;

        (iv)   delays occasioned by performance by CTI of any Emergency Service
               in accordance with Clause 3.2 below;

        (v)    delays caused by disputes on the issue of an Acceptance
               Certificate resolved or determined in CTI's favour;

        (vi)   delay in obtaining or refusal to grant planning approval to the
               extent that the delay is outside CTI's control;

        (vii)  lack of agreement on national or international frequency co-
               ordination or frequency planning or changes in frequencies;

        then the Phase 1 Launch Date or the Phase 2 Service Date or Phase 3
        Service Date (as the case may be) for affected Stations and the date for
        completion of the other obligations of CTI under this Agreement will be
        amended to reflect the period of the delay resulting from that event.
        Further, the BBC shall pay any reasonable additional costs incurred by
        CTI and evidenced to the BBC to overcome or circumvent the matter giving
        rise to any delay under Clause 2.5.2(ii) above.

                                      16
<PAGE>
 
2.6  MODIFICATIONS TO ANALOGUE TRANSMITTERS

     2.6.1     Modifications may be required to the transmission characteristics
               of existing analogue transmitters located at Stations or at other
               transmission sites to permit the introduction of the BBC
               Multiplex and to ensure the transmission of analogue and digital
               services without interference from those Stations and other sites
               simultaneously with the digital transmission of the Data.

     2.6.2     The determination of what modifications are required will require
               co-ordination with other industry participants. Although the BBC
               will be primarily responsible for this process, CTI must take a
               pro-active role in this co-ordination, and will be required to
               represent the BBC's interests on relevant working groups.

     2.6.3     Details of the modifications to the existing analogue
               transmitters which shall be undertaken by CTI are set out in
               Schedule 4. Work carried out by CTI in this field in addition to
               that described in Schedule 4 may be an additional cost to be
               borne by the BBC and agreed between the parties in advance.

     2.6.4     Modifications shall be made to transmitters by the Test Date for
               the relevant Station.

     2.6.5     CTI shall not be responsible for modifying equipment at viewers'
               premises.

2.7  INSTALLATION AND TESTING

     2.7.1     CTI must, subject to this Agreement, and in particular to Clauses
               2.2.3 and 2.7.2, install and test each Station by the Build Date,
               and have Accepted each Phase 2 Station and Phase 3 Station by the
               Build Date and make each Station Operational by the Phase 1
               Launch Date or the Phase 2 Service Date or Phase 3 Service Date
               (as the case may be) for that Station. CTI must ensure that by
               the Phase 1 Launch Date or Phase 2 Service Date or Phase 3
               Service Date (as the case may be) for that Station:

        (i)    the Station is capable of providing the DTT Transmission Services
               in accordance with the Transmission Requirements;

        (ii)   all Distribution Links and other equipment or facilities
               (including multiplex facilities) required in order for CTI to
               supply the DTT Transmission Services from the Station are
               installed and operating such that the DTT Transmission Services
               can be provided from that Station in accordance with the
               Transmission Requirements; and

                                      17
<PAGE>
 
        (iii)  the transmitter and other equipment installed at the Station
               comply in all material respects with the High Level Design for
               the Station. Subject to Clause 2.2.3, such High Level Design will
               comply with the Transmission Requirements.

     2.7.2     CTI must give the BBC 14 days' notice of when a Station first
               becomes available for testing. Each Station must be available for
               testing by the Test Date for that Station unless otherwise agreed
               between the parties. For the avoidance of doubt, if a Station is
               available before that time CTI must notify the BBC in accordance
               with this paragraph.

     2.7.3     The Acceptance Tests in relation to each Station shall be as set
               out in Schedule 6, or as otherwise amended by agreement between
               the parties.

     2.7.4     The Acceptance Tests will be carried out at such times as are
               agreed between the parties, and shall be jointly executed by the
               BBC and CTI unless the BBC notifies CTI in writing that CTI may
               carry out any such Acceptance Tests itself, in which event the
               BBC shall be entitled to attend. CTI shall, in all cases, notify
               the BBC with copies of the results of Acceptance Tests, when any
               such Acceptance Tests have been completed.

     2.7.5     The BBC must notify CTI in writing within 24 hours of receipt of
               the results of Acceptance Tests if it considers that the
               Acceptance Tests have not been completed successfully in
               accordance with Schedule 6 Part 2. If the BBC confirms such
               successful completion or does not respond to CTI within the said
               24-hour period, then Acceptance for the purposes of this
               Agreement will have taken place on the date on which the
               Acceptance Tests were delivered to the BBC.

     2.7.6     For the avoidance of doubt, Acceptance of a Station in accordance
               with this Clause will not affect, remove or mitigate any other
               obligations of CTI under this Agreement including, without
               limitation, the obligation to provide the DTT Transmission
               Services in accordance with the Transmission Requirements and the
               obligation to pay Service Credits calculated in accordance with
               Schedule 8. No service credits shall be payable in respect of any
               Station until that Station's Acceptance in accordance with this
               Clause 2.

     2.7.7     If within 24 hours of the receipt of the Acceptance Tests the BBC
               notifies CTI in writing that it does not consider that the
               Acceptance Tests have been completed successfully and CTI and the
               BBC shall fail to settle the matter in dispute within a further 7
               days, then the question of whether the Acceptance Tests have been
               completed successfully

                                      18
<PAGE>
 
               will be referred to the Expert described in Clause 5.6.5 for the
               Expert's determination as set out in Clause 5.6.5.

     2.7.8     If, pursuant to Clause 2.7.7, it is agreed or determined that the
               Acceptance Tests have not been completed successfully, CTI shall
               be required to take such steps as are necessary to ensure
               successful completion of such Acceptance Tests at CTI's expense.
               In such circumstances CTI shall also reimburse the BBC in full
               for its costs and expenses reasonably incurred in investigating
               and disputing the unsuccessful Acceptance Tests. If, pursuant to
               Clause 2.7.7, it is agreed or determined that the Acceptance
               Tests have been completed successfully then no liquidated damages
               or other amounts shall be payable by CTI and the Station(s) in
               question shall be deemed to have been Accepted on the date on
               which CTI first delivered the Acceptance Tests to the BBC.

     2.7.9     Detection of a fault as a result of a helicopter survey conducted
               pursuant to the procedure set out in paragraph 12 of Schedule 6
               Part 2 shall not of itself affect the timing of completion of the
               Acceptance Tests. CTI agrees that if a fault is so detected it
               will rectify it within a reasonable period of time, such time to
               be agreed between the partes.

2.8  MILLENNIUM COMPLIANCE

     CTI must ensure that all software and systems installed or used in the
     Transmission Network, or otherwise used in relation to the provision of the
     Services, are Millennium Compliant. 

                                      19
<PAGE>
 
                       PART C - SERVICE OPERATION PHASE

3    SERVICES

3.1  DTT TRANSMISSION SERVICE

     3.1.1     From the Phase 1 Launch Date or the Phase 2 Service Date or Phase
               3 Service Date (as the case may be) in relation to each Station,
               CTI shall provide the digital terrestrial transmission of the
               Data from that Station using the BBC Multiplex in accordance with
               the Transmission Requirements. The Data will be delivered to CTI
               at the Interfaces in the form set out in Schedule 7, and CTI
               shall be responsible for conveying the Data from the Interfaces
               to the Stations for transmission using the Distribution Links.
               The services described in this Clause 3.1.1 shall comprise the
               "DTT Transmission Service". A detailed description of the DTT
               Transmission Service is set out in Schedule 5. Nothing in this
               Agreement shall constitute or imply any warranty, representation
               or obligation on the part of CTI as to the size or location of
               the areas actually capable of receiving Data transmitted by CTI
               in accordance with this Agreement or that any such Data is
               capable of reception in the whole or part of any such area.

     3.1.2     In addition, CTI will ensure that the DTT Transmission Service
               is:

               (i)   performed in accordance with the standard of care to be
                     reasonably expected of a skilled provider of digital
                     terrestrial television broadcast transmission services; and

               (ii)  provided on a continuous basis at all times when the Data
                     is scheduled by the BBC to be transmitted.

     3.1.3     CTI shall not be liable for failure to provide the DTT
               Transmission Service:

               (i)   in respect of any failure or degradation of the signal or
                     message comprising the Data which arises during
                     transmission of the Data to the Interfaces and prior to
                     receipt at the Interface;

               (ii)  (except as provided in (i) above) where it is temporarily
                     unable to provide all or part of the DTT Transmission
                     Service due to a Force Majeure Event;

               (iii) where any of the Transmission Network is requisitioned,
                     taken over or used pursuant to Clause 8 of the DNH
                     Agreement, any Emergency Powers, including for the making
                     of Emergency Announcements or the performance of Emergency

                                      20
<PAGE>
 
               Services or action taken by any authority pursuant to any
               direction under Section 94 of the Telecoms Act or by any
               authority pursuant to Condition 6 of CTI's Telecoms Act licence;

        (iv)   where any part of the Transmission Network is subject to a notice
               issued by the Secretary of State or the Radiocommunications
               Agency which requires the cessation of, or adversely affects the
               provision of, the DTT Transmission Service:

               (a)   in the interests of long-term spectrum planning; or

               (b)   in the event of a national or local state of emergency
                     being declared.

     3.1.4     CTI hereby undertakes not to change, add or remove any Data or in
               any other way affect the BBC's editorial control of the Data
               whether before or after its transmission through the Transmission
               Network, other than:

               (i)   as is necessary to process and multiplex the signals for
                     the purposes of transmission by the transmitters comprised
                     in the Transmission Network in accordance with the terms of
                     this Agreement; or

               (ii)  where automatic protection systems are in place; or

               (iii) for purposes of monitoring the Data as it is transmitted,
                     provided that any Data which is decoded for purposes of
                     monitoring is not subsequently recoded for transmission; or

               (iv)  as directed by the BBC in writing.

               Any changes made to the transmission of the Data in the event of
               a Force Majeure Event or Transmission Fault shall be the
               responsibility of the BBC unless the BBC gives instructions to
               CTI to make specified changes to the Data to circumvent the Force
               Majeure Event or the Transmission Fault and it is reasonably
               practicable to make such changes within the requisite timescale.

     3.1.5     This Agreement does not cover the insertion of EPG or CA
               information into the Data. However, CTI will be required to
               transmit EPG or CA data, which may be inserted by one or more
               third parties. CTI must co-operate with, and provide reasonable
               assistance where requested, to any such third parties. It shall
               ensure that its equipment has the flexibility to support the
               transmission of EPG and CA. Any introduction of EPG or CA

                                      21
<PAGE>
 
               into the DTT Transmission Service will be dealt with under the
               Change Control Procedure.

     3.1.6     CTI must use its reasonable endeavours to ensure that no pirated
               signal or other unauthorised data is injected to any signal
               broadcast using the BBC Multiplex at any stage after the
               Interface and at or before transmission by CTI and must use its
               reasonable endeavours, to ensure that no Station picks up off air
               signals not licensed for broadcasting in the UK and re-transmits
               such signals or other unauthorised data using the BBC Multiplex.
               If CTI becomes aware of the injection of any pirated signal or
               the retransmission of such off air signals it must promptly
               inform each of the BBC and the Radiocommunications Agency and co-
               operate with any request of the BBC or the Radiocommunications
               Agency concerning that pirated signal or other unauthorised data
               or off air signal. Any steps taken by CTI to resolve any such
               problems which do not result from any breach of this Clause by
               CTI shall not be an Accountable Incident for the purposes of this
               Agreement.

3.2  EMERGENCY SERVICES

     3.2.1     In the event that the BBC notifies CTI that the Data includes any
               Emergency Announcements, CTI will transmit such Emergency
               Announcements from all Stations notified to it by the BBC (to the
               extent that the Station forms part of the Transmission Network at
               the time), using, where required, the Transmission Network
               (notwithstanding any Planned or Routine Maintenance relating to
               such Stations), and will halt, to the extent that it would
               otherwise prevent the transmission of such Emergency
               Announcements, any emergency fault repair. In the event that the
               BBC notifies CTI that it has been requested by the Secretary of
               State to refrain from broadcasting or transmitting any matter or
               class of matter, the BBC will use reasonable endeavours to
               prevent such matter from being sent to the Interfaces.

     3.2.2     The BBC will act as required, requested or directed by the
               Secretary of State, any Minister of Her Majesty's Government, the
               Home Office or the Channel Islands' authorities in providing any
               Emergency Announcement, requiring the cessation of any
               transmission or taking possession of any of the Stations or any
               CTI Equipment. The BBC agrees to use its reasonable endeavours to
               provide as much notice as possible of any requirements for an
               Emergency Announcement or any of the Emergency Services. Subject
               to the terms of any direction given to CTI by Her Majesty's
               Government, the

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<PAGE>
 
               BBC and CTI will work together when required by the BBC to plan
               the procedures for transmitting Emergency Announcements. In the
               event of any dispute between CTI and the BBC, acting on behalf of
               the Secretary of State, any Minister, the Home Office or the
               Channel Islands' authorities, as to the procedures for
               transmitting Emergency Announcements, the reasonable requirements
               of the BBC shall prevail.

     3.2.3     In the event that the Secretary of State, or any Minister of the
               Crown, or official of the Secretary of State authorised to act on
               his or her behalf, has concluded that an emergency has arisen as
               contemplated by Clause 8.3 of the DNH Agreement then CTI agrees
               to permit the Secretary of State to exercise his or her powers to
               take control of the transmission of the Data or to do any of the
               other acts contemplated by Clause 8.3 of the DNH Agreement. The
               Secretary of State or his or her nominee may enter any CTI Sites
               (including pursuant to an order or direction made by Her
               Majesty's Government requiring this) in exercise of Emergency
               Powers and use all CTI Equipment located at such premises or
               sites and may use the BBC Multiplex and any spectrum licensed to
               CTI under the WTA. The BBC may act on behalf of the Secretary of
               State in this regard.

     3.2.4     Any provision of any Emergency Services or an Emergency
               Announcement, either at the request of the BBC or pursuant to any
               Emergency Powers, shall not constitute a breach of any other
               requirements of this Agreement or give rise to an obligation on
               CTI to make any payment or give any Service Credits to the BBC
               and to the extent that the provision of any such services delays
               a Launch Date, no damages in this connection shall be payable by
               CTI.

3.3  INDUSTRY INVOLVEMENT

     3.3.1     The parties understand that launch of DTT in the United Kingdom
               will require considerable industry co-ordination and co-
               operation. Each of them agrees to use all reasonable endeavours
               to participate in relevant industry working groups and to be pro-
               active in seeking to achieve industry agreement on matters that
               are yet to be determined.

     3.3.2     Without limiting the generality of Clause 3.3.1, CTI agrees that
               throughout the Term it will:

                                      23
<PAGE>
 
        (i)    liaise with other multiplex and transmitter network operators and
               receiver and set top box manufacturers with a view to ensuring
               that the Data can be satisfactorily received and displayed in
               accordance with the Transmission Requirements;

        (ii)   procure that the CTI Representative attends all seminars,
               industry meetings or other meetings as the BBC may reasonably
               request relating to the subject matter of this Agreement
               including, without limitation, meetings relating to digital
               terrestrial video broadcasting, CA, SI, EPG and domestic,
               regional and international frequency allocation; and

        (iii)  assist the BBC where requested to make oral or written
               representations or submissions to, or conducting negotiations
               with, regulators, industry or government bodies or working groups
               relating to the subject matter of this Agreement including,
               without limitation, representations, submissions or negotiations
               relating to digital terrestrial video broadcasting, CA, SI, EPG
               and domestic, regional and international frequency allocation.

3.4  SPECTRUM MANAGEMENT

     3.4.1     Throughout the Term, CTI will co-operate with and assist the BBC
               where requested in relation to spectrum management and frequency
               allocation but the BBC remains primarily responsible for such
               matters.

     3.4.2     CTI will at the request of the BBC and/or the Radiocommunications
               Agency investigate at its own cost any instances of interference
               to digital or analogue broadcast transmission or reception which
               may be related to the Stations or the performance of the DTT
               Transmission Services anywhere in the United Kingdom, the Channel
               Islands or the Isle of Man. In the event that such interference
               is found to be as a direct result of an act or omission by the
               BBC, the BBC will be responsible for CTI's costs of investigating
               that interference. CTI's obligations under this Clause 3.4.2
               shall not extend to investigating interference at viewers'
               premises.

3.5  DISTRIBUTION LINKS

     3.5.1     CTI will use a fibre distribution network provided by British
               Telecommunications PLC ("BT").

     3.5.2     The current distribution network is set out in Schedule 12 (the
               "NETWORK").  By the completion of Phase 3 in accordance with the
               Roll-out Plan and the Phase 3 Launch

                                      24
<PAGE>
 
               Date no fewer than 76 Stations will be connected by primary fibre
               link to the Network and no fewer than 40 Stations will be
               connected with a dual fibre link to this Network. No more than 5
               Stations will have dual radio feed connections to the Network.

     3.5.3     [*]

4    THE BBC'S OBLIGATIONS

4.1  OPERATIONAL OBLIGATIONS

     4.1.1     The BBC shall supply the Data to CTI in accordance with the
               Interface Specification for transmission by CTI from the
               Interface. No material changes may be made to the Interface
               Specification without the agreement of CTI and the BBC.

     4.1.2     In the event of interruption or degradation to the signal
               carrying the Data occurring prior to receipt by CTI of the Data
               at the Interface the onus shall be upon the BBC at its own cost
               to establish and remedy at its own cost the cause. CTI shall not
               be held to be in breach of any of its obligations under this
               Agreement as a result of interruption or deterioration in the
               quality of transmission of the Data in such circumstances, unless
               that interruption or degradation is as a direct result of the
               breach by CTI of any of its obligations under this Agreement .


4.2  DATA

     4.2.1     The BBC will supply the Data to the Interfaces in such form as is
               necessary to permit CTI to comply with the relevant provisions of
               the 1996 Act, the terms upon which the BBC Multiplex is allocated
               to the BBC, the WTA or the Telecoms Act and any other licence or
               consent which governs or relates to the running of the
               Transmission Network, provided that any requirements necessary to
               enable CTI to so comply are notified by CTI to the BBC from time
               to time.

     4.2.2     Without limitation to the generality of Clause 4.2.1, the BBC
               will not knowingly permit the Data to contain any material:

        (i)    which is defamatory, offensive or abusive or of an obscene or
               menacing character; or

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      25
<PAGE>
 
        (ii)   which constitutes a violation or infringement of the rights of
               any person (including but not limited to all intellectual
               property rights such as moral rights, rights of copyright or
               confidentiality) or infringement of any law.

     4.2.3     The BBC will indemnify CTI against all Losses arising out of or
               in any way connected with the matters referred to in Clause
               4.2.2.

     4.2.4     The BBC reserves the right, under this Agreement, to vary at any
               time the number of channels comprised in the Data and the nature
               of the Data that it broadcasts using DTT, provided that the total
               capacity required to broadcast the Data is not greater than the
               total available on the BBC Multiplex (24.13 Mbit/S).

4.3  BBC AFFILIATES

     Subject to the BBC being responsible for compliance with any relevant legal
     or regulatory requirements, the BBC may permit its Affiliates to use the
     Services. The BBC will be responsible for any use by its Affiliates and for
     procuring that its Affiliates comply with the terms of this Agreement.

4.4  FREQUENCY CLEARANCES

     As between the BBC and CTI, the BBC shall be responsible for ensuring that
     the BBC has been, and continues to be, allocated all the necessary
     frequencies for the digital terrestrial television broadcasting of Data in
     the UK. CTI will not be responsible for any failure to obtain or delay in
     obtaining such allocations.

                                      26
<PAGE>
 
        PART D - PROJECT MANAGEMENT, SERVICE MANAGEMENT AND CONTRACT   
                                  MANAGEMENT

5    CONTRACT MANAGEMENT, REVIEW OF SERVICES AND DISPUTES

     The parties shall comply with the provisions relating to operational
     management of this Agreement set out in Schedule 8 hereto.

5.1  SERVICE LEVEL AGREEMENT

     5.1.1     Within 3 months from the date of execution of this Agreement CTI
               must submit to the BBC a draft service level agreement or
               agreements (the "SLA") setting out detailed provisions relating
               to the following matters:

        (i)    performance requirements of the Services;

        (ii)   operational management of the Services;

        (iii)  the manner and form of problem notification;

        (iv)   the mechanism for review of the Services;

        (v)    the management and escalation of problems arising from this
               Agreement; and

        (vi)   other matters relating to the day-to-day implementation and
               operation of this Agreement.

     5.1.2     Within 30 days of receipt by the BBC of the draft SLA, the
               parties will discuss in good faith the terms of the SLA with a
               view to reaching agreement on its terms. CTI will take into
               account any reasonable comments of the BBC and modify the SLA
               accordingly.

     5.1.3     If the terms of the SLA are not agreed within 6 months from the
               date of execution of this Agreement, then the agreement of its
               terms will be escalated in accordance with Clause 5.6.

     5.1.4     The SLA is intended to operate as a functional document which is
               used in the day-to-day management and operation of the Services.
               It will need to be continually reviewed, in accordance with the
               terms of this Clause 5, to reflect the developing nature of the
               Services and to ensure the continual improvement of the Services.

                                      27
<PAGE>
 
     5.1.5     Each party agrees to comply with the terms of the SLA provided
               that, if from time to time there is any inconsistency between the
               terms of this Agreement and the terms of the SLA, the terms of
               this Agreement will prevail to the extent of the inconsistency.
               The agreement of terms in the SLA which are inconsistent with or
               supplementary to the terms of this Agreement will not be treated
               as a waiver or variation of any terms of this Agreement.

5.2  GENERAL PRINCIPLES AND DEVELOPMENT OF THE SERVICES

     5.2.1     It is intended by the parties that they will operate this
               Agreement in close communication with the aim of achieving the
               closest possible co-operation in relation to the Services. It is
               recognised by the parties that to achieve this aim both parties
               will need to consult with each other on a frequent basis and
               regularly on a daily basis.

     5.2.2     CTI will constantly strive to improve the quality, reliability
               and value for money of the Services in accordance with the
               principles set out in paragraph 2 of Schedule 3 hereto.

     5.2.3     CTI will approach the provision of the Services to the BBC in an
               innovative and creative fashion.

     5.2.4     On or before 30 September in each Year (or on such other date as
               is agreed), CTI will provide to the BBC an annual written report
               to be prepared at its own cost which:

        (i)    describes the changes and improvements made during the last Year
               to the infrastructure and facilities used to provide the Services
               and those planned for the next Year and subsequent Years;

        (ii)   contains a summary of industry trends and innovations, sufficient
               to give the BBC an understanding of options that may exist for
               future improvement or development of the Services and technology
               developments that could improve the quality, reliability and
               value for money of the Services;

        (iii)  includes an executive summary; and

        (iv)   is otherwise in such format and contains such material as the
               parties agree.

     5.2.5     CTI acknowledges that the BBC wishes to be able to take advantage
               of potential improvements in technology which will improve the
               quality of the Services and to ensure that it is placed to meet
               industry developments. CTI will inform the BBC of any

                                      28
<PAGE>
 
               changes, developments or industry trends that may assist the BBC
               in achieving this aim and will inform the BBC Representative of
               any means of which it is aware from time to time to improve the
               reception of the Data, the coverage area receiving the Data, or
               the quality, reliability or value for money of the Services.

     5.2.6     The parties shall work together in good faith in carrying out
               their respective obligations under this Agreement.

5.3  PROJECT AND CONTRACT MANAGEMENT AND OPERATIONAL MANAGEMENT

     5.3.1     In respect of the day-to-day management of this Agreement and the
               performance of each part of the Services:

        (i)    CTI will deal with the BBC Operational Point of Contact; and

        (ii)   the BBC will deal with the Technical Operations Centre.

     5.3.2     CTI must appoint a person who will be the BBC's primary point of
               contact at CTI in relation to the roll-out of the Transmission
               Network (the "PROJECT MANAGER"). CTI must also appoint a person
               who will be the BBC's primary point of contact at CTI in relation
               to the provision of the Services (the "SERVICES MANAGER"). The
               initial Project Manager will be Russel Inman and the initial
               Services Manager will be Peter Lee.

     5.3.3     The Project Manager and the Services Manager may be the same
               person or they may be two different people.

     5.3.4     [*]

     5.3.5     CTI must give the BBC at least 1 month's notice of the removal of
               the Project Manager or the Service Manager, unless it is unable
               to do so and the removal results from the resignation, dismissal
               with due cause, illness or death of the Project Manager or
               Services Manager or any other similar event outside the control
               of CTI ("UNAVOIDABLE EVENT"). If an Unavoidable Event occurs, CTI
               must advise the BBC as soon as reasonably practicable after it
               becomes aware that the Unavoidable Event will result or is likely
               to result in the removal of the Project Manager or the Services
               Manager.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      29
<PAGE>
 
     5.3.6     CTI must provide the BBC with details of the experience of any
               proposed replacement for the Project Manager or the Services
               Manager and must give the BBC the opportunity to meet with the
               proposed replacement. The replacement must be approved by the
               BBC, such approval not to be unreasonably withheld. Except in
               cases where an Unavoidable Event has occurred, the replacement
               must be approved by the BBC prior to the removal of the Services
               Manager or the Project Manager.

     5.3.7     Except in cases where an Unavoidable Event has occurred, when a
               replacement Services Manager or Project Manager is appointed,
               there must be at least a one-month handover period where the
               replacement works together with the outgoing Services Manager or
               Project Manager, as the case may be.

     5.3.8     The BBC Representative will be the BBC's primary point of contact
               for the Project Manager and the Services Manager.

     5.3.9     The BBC Representative and the Project Manager will meet once
               every month, or more frequently at the request of either party,
               until both parties agree that such meetings are no longer
               required. These meetings will relate to the roll-out of the
               Transmission Network. Each month, the Project Manager will be
               required to provide the following:

        (i)    an overall programme plan indicating the main implementation
               issues, including acceptance and end-to-end testing and
               identifying the critical path for roll-out of the Transmission
               Network and provision of the DTT Transmission Service;

        (ii)   GANTT charts showing clearly the timescale and relationship
               between each phase of the project, including major milestones,
               and clearly indicating any critical areas; and

        (iii)  progress reports showing developments and progress against the
               plan. An updated version of the flow diagram or GANTT chart,
               revised to show progress and re-calculated to show any changes to
               the forecast ready for service date shall be provided with every
               progress report.

     5.3.10    The BBC Representative and the Services Manager will meet once
               every month, or more frequently at the request of either party,
               beginning at least three months prior to the Phase 1 Launch Date
               or at such other time as is agreed.

                                      30
<PAGE>
 
5.4  SERVICE MANAGEMENT BOARD

     CTI and the BBC will establish a Service Management Board to deal with all
     major matters concerning the amendment, or the reviewing of the operation,
     of this Agreement. It will consist of two or more representatives of each
     party, including the Services Manager, the Project Manager and the BBC
     Representative. The Board will meet quarterly, or at such other time as is
     agreed between the parties. Its remit will be as follows:

     5.4.1   to make recommendations to the parties regarding the need for, and
             implementation of, changes to the Services or the SLA;

     5.4.2   to attempt to resolve any disputes that may arise between the
             parties which cannot be satisfactorily resolved between the
             Services Manager and the BBC Representative or the Project Manager
             and the BBC Representative, and which are referred to it in
             accordance with Clause 5.6, and to make recommendations to the
             parties regarding any such dispute;

     5.4.3   to monitor technological developments in telecommunications and
             broadcasting which may affect the provision of the Services and to
             make recommendations to the parties regarding the desirability of
             improving the Services in light of such changes and to consider and
             plan for the implementation of new services;

     5.4.4   to make recommendations on changes to this Agreement required by
             reason of changes to the Charter and DNH Agreement; and
     
     5.4.5   any other matters on which the parties agree from time to time.

5.5  ANNUAL REVIEW

     CTI and the BBC will hold an annual review meeting which must be attended
     by the Chief Executive Officer of CTI (or a replacement reasonably
     acceptable to the BBC) and the BBC's Director of Policy and Planning (or a
     replacement reasonably acceptable to CTI).

5.6  DISPUTES

     5.6.1   Any complaints, disputes or problems (each an "ISSUE") relating to
             this Agreement will be escalated as set out in this Clause 5.6.

     5.6.2   Any Issue will be referred in the first instance to the BBC
             Representative and either the Project Manager or the Services
             Manager, as appropriate.  The BBC and CTI will procure that their
             respective representatives discuss in good faith any Issue with a
             view

                                      31
<PAGE>
 
             to resolving it. If an Issue is not resolved to the satisfaction of
             either party within 30 days of both parties having first been aware
             of it, then either party may refer it to the Service Management
             Board.

     5.6.3   If an Issue is referred to the Service Management Board, then each
             party must procure that their Representatives on that Board discuss
             the Issue in good faith at the next meeting of the Service
             Management Board with a view to resolving it. Either party may
             convene a meeting of the Service Management Board to be held within
             14 days of an Issue being referred to it. If the Issue is not
             resolved to the satisfaction of both parties within 7 days of the
             meeting of the Service Management Board, then either party may
             require that the Issue is dealt with under Clause 5.6.4.

     5.6.4   Where an Issue is to be dealt with under this Clause 5.6.4, the
             parties will ensure that, for the BBC, the Director of Policy and
             Planning, and for CTI, the Chief Operating Officer, will meet
             together with a view to resolving the Issue. The parties will allow
             30 days from the date of escalation of the matter for such
             consultation or discussions to take place before referring the
             Issue to adjudication or initiating any arbitration or other legal
             proceedings.

     5.6.5   If an Issue is not resolved pursuant to Clause 5.6.4 and it relates
             solely to matters of an engineering or technical nature, either
             party may refer it for adjudication to the President for the time
             being of the Institution of Electrical Engineers, or his nominee.
             The President or his nominee shall act as an expert, not an
             arbitrator. The Expert shall in no circumstances be an employee,
             agent or sub-contractor of NTL, CTI or the BBC and shall in all
             other ways be independent of all such persons. The party referring
             any Issue for adjudication must deliver to the expert and the other
             party a notice setting out the matters in dispute and any relevant
             supporting evidence. The other party shall be entitled to reply to
             the notice and such evidence, delivering such reply to the expert
             and the party referring the Issue. Otherwise, the expert shall be
             entitled to decide on the procedure he or she wishes to adopt. Any
             determination of the expert must be in writing and shall be final
             and binding on both parties, failing any manifest error on the face
             of the decision. Unless the expert determines otherwise, both
             parties will bear their own costs of the determination and half the
             costs of the expert.

     5.6.6   If an Issue is not resolved pursuant to Clause 5.6.4 and it does
             not relate solely to matters of an engineering or technical nature,
             either party may refer it to mediation in

                                      32
<PAGE>
 
             accordance with the Centre for Dispute Resolution procedures then
             in force. If after 30 days either party believes that mediation has
             not resolved the Issue, then either party may proceed to
             litigation. Unless agreed otherwise, each party will bear its own
             costs of the mediation and half the costs of any third party
             involved.

     5.6.7   Except where clearly prevented by the nature of the Issue, the
             parties must continue performing their respective obligations under
             this Agreement while any Issue is escalated in accordance with this
             Clause 5.

6  CHANGE CONTROL

6.1   CHANGES BY CTI

     6.1.1   Subject to Clause 6.1.2, CTI shall not make any changes to the High
             Level Design which have or may have a material effect on the
             performance of CTI's obligations under this Agreement without the
             BBC's prior written consent, not to be unreasonably withheld or
             delayed. CTI may make any other changes to the High Level Design
             provided it notifies the BBC of the proposed changes and the reason
             for such proposed changes in advance in writing. CTI may make other
             changes to the Transmission Network provided that:

      (i)    any such changes do not detract from, reduce or impair the
             performance or operation of the Services or the Transmission
             Network (which includes the flexibility of the Transmission
             Network);

      (ii)   CTI is still able to comply with the Transmission Requirements and
             the Target Performance Measures; and

      (iii)  it notifies the BBC of such changes in advance in writing and,
             where such proposed changes are notified to the BBC before
             completion of Phase 3 and subject to Clause 6.1.2 below, CTI
             obtains the BBC's prior written consent, such consent not to be
             unreasonably withheld or delayed.

     6.1.2   The BBC's consent under Clause 6.1.1 shall not be required where:
      
      (i)    closure of a Station is necessitated by a Force Majeure Event; or

      (ii)   closure is required, either on a temporary or a permanent basis, by
             reason of road building or other civil works carried out by a
             government or public sector body or
                                      
                                      33
<PAGE>
 
                 any other person acting under a concession granted by a
                 government or public sector body; or any other person acting
                 under a concession granted by a government or public sector
                 body; or

          (iii)  if the change is required by law, any national or supranational
                 regulatory authority, the Radio Regulations, or any statutory
                 obligations.

          In such circumstances, the parties agree to make all necessary
          consequential amendments to this Agreement in accordance with the
          Change Control Procedure.

     6.1.3       In making any changes in accordance with this Clause 6.1, CTI
                 will have regard to the BBC's programme scheduling requirements
                 and give the BBC's Representative as much written notice as
                 reasonably practicable, with sufficient details of any proposed
                 changes.
6.2  [*]

6.3   OTHER CHANGES

      6.3.1   Each of the parties acknowledges that the nature of the Services
              being provided under this Agreement means that they are likely to
              change as digital terrestrial television broadcasting develops in
              the United Kingdom and in Europe.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      34
<PAGE>
 
     6.3.2  Either party may from time to time request or suggest a change to
            the Services provided under this Agreement. Any such request or
            suggestion will be dealt with in accordance with the Change Control
            Procedure.

     6.3.3  All modifications or amendments to this Agreement must be in writing
            and signed by both parties and must specify which Clauses and
            Schedules are intended to be amended. All modifications or
            amendments to this Agreement must be agreed in accordance with this
            Clause 6.

7    PERFORMANCE MONITORING AND REPORTING
7.1  MONITORING

     7.1.1  Detailed provisions relating to monitoring and reporting of
            performance will be contained in the SLA. To the extent that there
            is any inconsistency between the terms of the SLA and the terms of
            this Clause 7, the terms of this Clause will prevail unless the
            parties agree otherwise in writing.

     7.1.2  CTI must install and operate monitoring, control and reporting
            equipment to allow the dynamic checking of:

      (i)   the integrity of the received and broadcast MPEG transport stream;

      (ii)  compliance with the ERP and equivalent loss of noise margin
            requirements; and

      (iii) the transmission of the Data against the Transmission Requirements
            and Target Performance Measures.

     7.1.3  The monitoring performed by CTI must comply with the requirements
            set out in Schedule 8 and such other requirements as are agreed
            between the parties from time to time.

     7.1.4  CTI must monitor the quality of the signal received at the
            Interfaces. CTI must immediately notify the BBC Operational Point of
            Contact where any signal interruption or degradation is identified
            and provide all reasonable assistance to the BBC in establishing and
            remedying its cause.

     7.1.5  [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      35
<PAGE>

            [*]

     7.1.6  If any process of monitoring or verification which is required by
            the BBC requires an interruption of the DTT Transmission Service and
            CTI advises the BBC prior to the performance of the monitoring or
            verification that such an interruption will be required and gives it
            the option as to whether or not to continue, CTI will not be
            required to pay Service Credits if the BBC elects to continue and
            the monitoring or verification results in an Accountable Incident.
            If any process of monitoring or verification does not require
            interruption or the BBC is not advised prior to it being performed
            that it requires an interruption, then Service Credits will be
            payable in respect of any Accountable Incident that results from the
            monitoring or verification.

7.2  COMPLIANCE WITH THE TRANSMISSION REQUIREMENTS AND PERFORMANCE STANDARDS

     7.2.1  If the BBC reasonably believes that CTI has failed to comply with
            the Transmission Requirements or Target Performance Measures or that
            other impairments to the transmission of the Data have occurred in
            respect of any of the Stations, it may give to CTI written notice to
            this effect, and CTI shall carry out checks within seven days of the
            date of such notice to ascertain whether such failure has taken
            place and provide the results of such checking to the BBC and take
            any measures needed to comply with the Transmission Requirements and
            Performance Standards (provided that, in the event of any dispute
            between the parties, that dispute shall be referred to the BBC
            Representative and the CTI Representative and thereafter dealt with
            according to the contract management procedure set out in Clause 5).
            Where it is substantiated (either by agreement or by expert
            determination) that such failure has taken place, then the BBC shall
            be entitled to recover Service Credits to the extent of a failure to
            meet the Transmission Requirements in accordance with Clause 11.3.

     7.2.2  Performance measurement to ensure compliance with the Transmission
            Requirements shall take place [*]. During such tests, CTI shall
            deploy staff at a sufficient number of Stations and will carry out
            sufficient tests to ensure that the Transmission Network as a whole
            performs in accordance with the Transmission

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      36
<PAGE>
 
      Requirements.  In order to perform these tests, the BBC may apply an
      agreed set of test signals to the Transmission Network, in place of normal
      programme material. Each of the BBC and CTI shall bear its own costs in
      respect of such tests. If the network tests described above reveal that
      the Performance Standards are not being achieved, then:

      (i)   CTI must immediately rectify any defects in the Transmission Network
            so as to ensure that the Performance Standards are achieved;

      (ii)  CTI must make the Transmission Network available for re-tests to
            take place. In undertaking such re-tests, CTI shall endeavour to
            minimise disruption to the Services. CTI shall be responsible for
            all costs of such re-tests, including any reasonable costs incurred
            by the BBC; and

      (iii) CTI will be liable to pay Service Credits in respect of any failure
            to meet the Performance Standards which is revealed as a result of
            the network tests until such time as the Performance Standards are
            met.

7.3  PERFORMANCE REPORTING

     7.3.1  CTI will produce a monthly performance review report relating to its
            compliance with the Transmission Requirements and Performance
            Standards. The report must be in a form to be agreed between the
            parties, but must include, as a minimum, the following:

      (i)   a list of all Transmission Faults that have occurred during the
            period covered by the report (including Transmission Faults which
            are not Accountable Incidents);

      (ii)  a separate list of all Accountable Incidents that have occurred
            during the period covered by the report;

      (iii) information showing details of actual performance which has differed
            significantly from the Target Performance Measures during the period
            covered by the report; and

      (iv)  such other information as is agreed between the parties from time to
            time.

     7.3.2  The report required under Clause 7.3.1 shall be sent to the BBC
            Representative within seven days of the end of each month.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

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7.4  PERFORMANCE DATABASE

     7.4.1  All source material relevant to monitoring, as specified in Schedule
            8, shall be recorded by CTI in an electronic database more fully
            described in Schedule 12 (the "PERFORMANCE DATABASE") which will be
            archived on a monthly basis and the data kept for 3 years from the
            end of the then current Year.

     7.4.2  CTI must provide the BBC with on-line access to the Performance
            Database. The BBC may use and copy the Performance Database and any
            information or data contained in the Performance Database or
            otherwise supplied pursuant to this Agreement relating to CTI's
            compliance with this Agreement solely for the purposes of this
            Agreement, assessing the performance of digital terrestrial
            broadcasting generally and in performance of its obligations to the
            Department of Culture, Media and Sport in relation to this Agreement
            and the performance of digital terrestrial broadcasting only.

     7.4.3  If CTI becomes aware at any time that the information contained in
            the Performance Database is or may be inaccurate, it must promptly
            notify the BBC and must reprocess the data so that it is accurate
            and provide the BBC with the revised information. If the BBC
            considers that the Performance Database is or may be providing
            inaccurate information it may advise CTI and CTI must promptly
            investigate the potential inaccuracy.

     7.4.4  The information provided by the Performance Database will be used
            for the purpose of measuring CTI's compliance with its obligations
            under this Agreement. It will be assumed to be accurate unless:

      (i)   it is reasonably apparent that it is incorrect or it is likely that
            it has not been calculated correctly; or

      (ii)  either party demonstrates that it is not correct or that it is
            likely that it has not been calculated correctly.

     7.4.5  CTI must provide the BBC with one copy in a format specified by the
            BBC of such application software as may be required in order to
            enable the BBC to access the Performance Database (the "SOFTWARE").
            CTI hereby licenses the BBC and, subject to Clause 7.4.6 below,
            wholly-owned subsidiaries of the BBC on a non-exclusive basis for
            the Term to use the Software at any location from which the BBC
            conducts business from time to time for the purposes of monitoring
            the supply of the Services under this

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    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

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            Agreement, assessing the performance of digital terrestrial
            broadcasting generally and in performance of its obligations to the
            Department of Culture, Media and Sport for the Term and a reasonable
            period thereafter. The BBC may make such backup copies of the
            Software as may be reasonably required provided that it applies its
            standard security procedures to the storage of that Software. All
            copies of the Software shall be returned to CTI by the BBC and its
            Affiliates on the termination or expiry of this licence.

     7.4.6  Any other party may be licensed to use the Software pursuant to
            Clause 7.4.5 upon:

      (i)   the BBC requesting the same of CTI;

      (ii)  CTI giving its specific consent (not to be unreasonably withheld or
            delayed); and

      (iii) the BBC showing that it has procured sufficient confidentiality
            obligations in relation to such software and the Performance
            Database to meet CTI's reasonable concerns.

   7.4.7    CTI warrants that:

      (i)   the Software will, when modified for BBC use pursuant to Clause
            7.4.5 above and when provided to the BBC, be of satisfactory quality
            and fit for the purpose for which it is supplied;

      (ii)  the Software will, when modified for BBC use pursuant to Clause
            7.4.5 above, and when provided to the BBC, be free from known
            viruses;
      
      (iii) the information provided from the Performance Database will be free
            from material errors; and

      (iv)  use by the BBC or its Affiliates of the Performance Database and the
            Software in accordance with the terms of this Clause 7.4 will not
            infringe the intellectual property rights of any party.

8    ACCESS

8.1  BBC ACCESS TO STATIONS

     8.1.1  The BBC or the BBC's nominated contractor(s) shall be permitted
            access to each of the Stations at least once per annum per Station
            by prior notice from the BBC Representative and by arrangement with
            CTI for the purpose of conducting routine

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

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            checks of the Transmission Network in order to ascertain whether it
            is meeting the Transmission Requirements.

     8.1.2  Where the BBC, or the BBC's nominated contractor(s) on behalf of the
            BBC, exercises its rights to access to the Stations, CTI may require
            that the BBC or the BBC's nominated contractor is accompanied by one
            appropriate member of CTI staff, at CTI's cost.

     8.1.3  The BBC shall comply with CTI's or NTL's reasonable regulations as
            notified to it from time to time when entering into and performing
            work on CTI's Sites and shall procure that each of its nominated
            contractors shall do the same. The BBC hereby indemnifies CTI for
            any loss or damage which it may suffer as a result of any acts or
            omissions of it or its nominated contractors in this connection.

8.2  BBC ACCESS TO RECORDS

     8.2.1  The BBC may by prior notice and arrangement with CTI require access
            to or copies of any specifications or diagrams of any of the
            Stations which are in the possession or control of CTI.

     8.2.2  The BBC has the right to audit any records on which the billing
            information provided under Clause 11.2 is based subject to the BBC's
            agreement to procure that all such records are kept confidential and
            used only for purposes connected with the verification of such
            billing information or disputing invoices. Such audit may be
            conducted by the BBC, or on the BBC's behalf by an independent
            auditor, not more than twice in each Year of this Agreement and at
            the BBC's cost. In the event that such audit reveals any discrepancy
            in any information provided relating to the Charges or in the
            Charges the BBC and CTI agree to rectify such discrepancy as soon as
            practicable. If CTI disagrees on the existence of a discrepancy then
            the matter shall be referred to the Service Management Board. In the
            event that any audit reveals overpayment by the BBC of more than 1
            per cent of the Charges or other amounts payable in any Year of this
            Agreement, CTI shall be responsible for all costs of the BBC's
            audit.

8.3  CTI ACCESS TO MASTS, STATIONS AND BBC SITES

     8.3.1  CTI will be required, where necessary, to negotiate with other
            transmitter mast providers to ensure that the BBC Multiplex and
            other digital terrestrial television multiplexes are radiated from
            the same mast at each Station.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

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   8.3.2  Where transmitters are required to be installed and operated at sites
          which are not CTI Sites, CTI is responsible for obtaining such rights
          of access to that site and the facilities located at that site for
          itself and for the BBC as are necessary in order for CTI to perform
          its obligations under this Agreement.

   8.3.3  CTI may locate such equipment at BBC Sites for purposes of providing
          the Services as is agreed with the BBC in writing, subject to CTI
          entering into a Site Sharing Agreement in relation to each such BBC
          Site at no greater than a nominal charge.

   8.3.4  For the avoidance of doubt, CTI will be a licensee only in respect of
          any BBC Site for which a Site Sharing Agreement is entered into and
          nothing in this Agreement shall imply any relationship of landlord and
          tenant or operate (save as may be specifically required) to give CTI
          any greater interest in the BBC Sites than that of a hirer of
          services. If there is any inconsistency between this Agreement and any
          Site Sharing Agreement the terms of this Agreement shall prevail.

9  THIRD PARTY SERVICES

   Nothing in this Agreement shall prevent CTI from entering into any
   arrangements with any third parties to provide broadcasting, transmission
   and/or any other telecommunications services from the Stations.  CTI agrees
   that such new arrangements shall not detrimentally affect the contracted
   provision of the Services to the BBC and CTI agrees not to use the BBC
   Multiplex other than for performance of the DTT Transmission Services except
   as otherwise agreed by the BBC (which agreement may be withheld in the
   absolute discretion of the BBC).

10 MAINTENANCE AND FAULTS

10.1  FAULT REPORTING AND REPAIR

   10.1.1  CTI shall provide a fault reporting information system operating in
           accordance with Schedule 8 and use that system to notify the BBC if
           it has failed to provide a Service and otherwise to test compliance
           with the Transmission Requirements and the Target Performance
           Measures.

   10.1.2  CTI will repair or otherwise attend to all Transmission Faults in
           accordance with Schedule 8 and Clause 10.2.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

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10.2    ROUTINE MAINTENANCE AND PLANNED INTERRUPTIONS

   10.2.1  ROUTINE MAINTENANCE AND INTERRUPTION

      (i)  CTI shall only interrupt the DTT Transmission Service or depart from
           the Transmission Requirements or Performance Standards at any one or
           more of the Stations for the purposes of access to works, safety and
           Routine Maintenance if it has agreed such interruption or reduction
           with the BBC in advance, in which case each interruption or reduction
           shall be a Planned Interruption. Where such access, safety and
           Routine Maintenance and/or repairs constitute and cause Accountable
           Incidents, the BBC shall be entitled to recover Service Credits
           calculated in accordance with Schedule 8.

      (ii) The BBC's prior agreement is not needed where CTI is obliged to carry
           out work because of any legal or regulatory requirement or if either
           the Radiocommunications Agency or the BBC has asked it to investigate
           or rectify any Harmful Interference.  If any legal or regulatory
           requirement is not immediate, CTI shall agree any interruption or
           departure with the BBC and the BBC agrees to consider such requests
           in good faith with a view to ensuring that CTI is not in breach of
           any such legal or regulatory requirement.  In all such circumstances,
           such interruptions or departures shall not be an Accountable
           Incident.

   10.2.2  PLANNED INTERRUPTIONS
   
      (i)  CTI may reduce or affect the Transmission Requirements or Performance
           Standards in order to carry out inspections, alterations,
           installation works, renewal of or repairs to any equipment at any
           Station forming part of the Transmission Network, including any
           reduced power operation at any Station and any notified power
           outages, provided CTI shall not cause or otherwise permit such
           interruptions without first giving reasonable advance notice to the
           BBC, and shall obtain agreement from the BBC as to the dates and
           times that such interruptions shall take place, such agreement not to
           be unreasonably withheld or delayed. Such interruptions shall be
           "Planned Interruptions". CTI shall use all reasonable endeavours to
           minimise such Planned Interruptions. Where the reduction or effect to
           the Transmission Requirements or Performance Standards constitute and
           cause

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

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           Accountable Incidents, the BBC shall be entitled to recover Service
           Credits calculated in accordance with Schedule 8.

      (ii) The BBC's prior agreement to a Planned Interruption is not needed
           where CTI is obliged to carry out work because of any legal or
           regulatory requirement.  If any legal or regulatory requirement is
           not immediate, CTI shall agree any reduction with the BBC and the BBC
           agrees to consider such requests in good faith with a view to
           ensuring that CTI is not in breach of any such legal or regulatory
           requirement.  If any Planned Interruption is a result of any legal or
           regulatory requirement, the interruption shall not constitute an
           Accountable Incident.

10.3    EMERGENCY FAULT REPAIR

   10.3.1  In the event of any interruption to the provision of the Services as
           a result of a Force Majeure Event, or an imminent fault reasonably
           apparent to CTI, CTI may interrupt the transmission of the Data for
           the purposes of dealing with the emergency. CTI will give the BBC
           Representative immediate notice of the event and whenever possible
           shall give notice to the BBC Representative of the duration of the
           interruption.

   10.3.2  CTI shall use all reasonable endeavors to minimise the duration and
           effect on the provision of the Services of any unscheduled
           interruption or fault.

   10.3.3  In the case of an emergency, when transmission of the Data cannot be
           restored at full power, reduced power will be employed.

   10.3.4  An Interruption of Services for an emergency will constitute an
           Accountable Incident unless it is a consequence of a Force Majeure
           Event.

10.4    GRADED BROADCASTS

   10.4.1  The BBC will notify CTI annually of the Graded Broadcasts that it
           expects to occur during the following year. If an urgent Graded
           Broadcast occurs which was not included in the annual notification,
           the BBC will give CTI as much notice of the Graded Broadcast as it is
           reasonably able to give.

   10.4.2  Subject to Clause 10.4.1, CTI must not conduct any planned or Routine
           Maintenance during a Graded Broadcast or during a reasonable period
           either side of a Graded Broadcast, the duration of that period to be
           agreed on a case by case basis by the parties.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

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10.5    SERVICE PRIORITIES

   10.5.1  When all or any of the Services cannot be restored at full power,
           reduced power operation of all or any of the Services will be
           employed, if no other arrangements are available to maintain the
           agreed Services. If it is not possible to restore Services to all or
           any of the Stations, the Operational Priority Stations will be
           restored first, and in accordance with an order to be agreed with the
           BBC. If CTI is also providing analogue or digital transmission
           services to third parties, the parties will hold discussions in good
           faith with a view to agreeing the order of priority for restoration
           of those services with the principle being that the BBC's services
           should be given at least as high a priority as the services of any
           other party.

   10.5.2  During a state of national emergency, a different order of priority
           may be introduced and CTI will comply with the instructions of the
           BBC Representative or such other person as is authorised to give such
           instructions provided these instructions are not in breach of any
           other instructions given by representatives of Her Majesty's
           Government.

  10.6  DISASTER RECOVERY

   10.6.1  CTI shall discuss and comply, where any BBC disaster recovery plan
           covers the Services or any part of the Services, with the reasonable
           requirements of the BBC disaster recovery plan or any other emergency
           procedures which may be developed from time to time and notified to
           CTI by the BBC.

   10.6.2  CTI must implement and comply with the requirements relating to
           Disaster Recovery as set out in Schedule 11.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

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<PAGE>
 
                                PART E - PRICING

11 CHARGES, PAYMENT AND BILLING

11.1  CHARGES AND PAYMENT FOR THE SERVICES

   The Charges payable under this Agreement by the BBC shall be calculated as
   set out in Schedule 2.  The Charges for each Year will be paid in 12 monthly
   installments.  In addition to the Charges, the BBC will pay all fees payable
   pursuant to the WTA Licences held by CTI for the purposes of carrying out its
   obligations under this Agreement, subject to CTI providing the BBC in advance
   with copies of such WTA Licences and evidence from the Radiocommunications
   Agency of the level of, and obligation to pay, such fees.

11.2  INVOICES
   
   11.2.1  CTI will invoice the BBC monthly in arrears, with invoices to be
           issued at the end of each month. All invoices will be addressed to
           the BBC Representative.

   11.2.2  Each invoice rendered by CTI must be accompanied by such billing
           information and be in such format as the BBC may reasonably require.

   11.2.3  Except as set out in Schedule 2, all correct Charges on an invoice
           submitted by CTI under this Agreement will be payable by the BBC at
           the end of the month following the month in which a correctly
           prepared invoice is received by the BBC. The BBC will pay by cheque,
           or by such other method as may be agreed from time to time between
           the parties without any set-off, deductions or withholdings other
           than as set out in this Agreement.

   11.2.4  In the event that any Charges are disputed, the BBC shall be entitled
           to withhold any disputed amounts, provided the BBC shall have given
           reasonable notice to CTI of the dispute relating to the Charges
           together with a reasonable description of the basis on which the BBC
           is disputing the Charges. In the event that any Charges are withheld
           by reason of a dispute, CTI and the BBC will both use their best
           endeavors to resolve any such disputed amount prior to the time of
           delivery of CTI's next invoice.

11.3  FAILURE TO MEET SERVICE OBLIGATIONS - SERVICE CREDITS

   11.3.1  The Charges payable hereunder will be subject to Service Credits,
           calculated in accordance with Schedule 8. Any Service Credits
           incurred will be set off against the Charges payable under the first
           invoice rendered by CTI following the month in which

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

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           the obligation to give Service Credits is determined in accordance
           with Schedule 8. Service Credits are intended to act as an incentive
           to CTI to provide quality services to the BBC and is not intended to
           result in a lower price being paid for a poorer quality service.

   11.3.2  Service Credits will not be available to the BBC to the extent that
           the failure of CTI to meet all or any part of its obligations under
           this Agreement results directly from the BBC's act, fault or omission
           or from any Force Majeure Event or from any failure of the BBC to
           comply with the WT Act and shall not be payable in respect of a
           Station until that Station has been accepted and is in service.

   11.3.3  CTI's total aggregate liability in respect of all obligations to pay
           Service Credits in any one Year, will be [*].

   11.3.4  To the extent that any obligation of CTI to pay Service Credits is
           due to a new technology problem which does not arise through any
           fault of CTI and is beyond CTI's reasonable control, the BBC will
           waive its right to the payment of Service Credits for the period
           beginning on the date on which the BBC and CTI have agreed in good
           faith a process to resolve the problem and ending on the date that
           CTI has achieved a workable solution to such a problem, PROVIDED
           always that CTI has at all times used all reasonable efforts to
           achieve such solution as soon as is reasonably possible.

   11.3.5  If, after provision of the DTT Transmission Service has commenced by
           CTI, there is a total failure to transmit the Data across the
           Transmission Network in circumstances where the failure to transmit
           is an Accountable Incident, rather than a partial failure to transmit
           any of the Data, for anything other than an immaterial period of time
           having regard to the nature of the Data, then CTI shall not [*]. The
           BBC shall not be entitled to obtain such services elsewhere if CTI is
           able at any reasonable time to perform such services and undertakes
           to do so, subject to any rights of termination under Clause 12, and
           subject to a reasonable period following notice of CTI's intention to
           recommence performance of the Services. If CTI pays any monies under
           this Clause, no Service Credits shall be

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

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           payable in respect of the period of time for which there is a failure
           to perform which is compensated under this Clause.

   11.3.6  The right to claim Service Credits under this Clause 11.3 is without
           prejudice to any other right that the BBC may have if CTI fails to
           comply with the terms of this Agreement.

   11.4    [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

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          [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

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<PAGE>
 
                         PART F - TERM AND TERMINATION

12   TERM AND TERMINATION

12.1      COMMENCEMENT AND RENEWAL

     12.1.1    This Agreement will come into force on the Effective Date and,
               subject to this Clause 12, shall continue in force for the Term.
               It will continue after the Term until terminated by either party
               on six months' notice expiring on or after the end of the Term.

12.2      TERMINATION ON CESSATION OF DTT

     12.2.1    The BBC may terminate this Agreement by giving CTI at least one
               year's written notice at any time during the three-month period
               following the fifth anniversary of the Phase 1 Launch Date, in
               the event that the Board of Governors of the BBC (or such
               equivalent body as may replace it) believes, at its sole
               discretion, that DTT does not have sufficient public take-up to
               justify continuing to provide the Services. In the event of
               termination of this Agreement by the BBC pursuant to this Clause
               12.2.1 the BBC shall not obtain digital television transmission
               services in the UK from any service provider other than CTI for a
               period of five years from the date of termination. The parties
               acknowledge that the right to terminate set out in this Clause
               12.2.1 has been granted because of the BBC's position as a public
               service broadcaster at the date of this Agreement, but that it is
               in no way conditional upon the BBC remaining so.

     12.2.2    If the BBC terminates this Agreement under Clause 12.2.1, then it
               must pay to CTI a termination payment by cash, cheque or bank
               transfer (subject to the BBC's right to set off any monies which
               the BBC and CTI agree or have previously agreed are due to the
               BBC from CTI or any outstanding Service Credits) calculated in
               accordance with Part 2 of Schedule 2 within 30 days after the
               Agreement terminates. This Agreement will continue in full force
               and effect for the period of the notice.

     12.2.3    Termination of this Agreement under Clause 12.2.1 shall give the
               BBC no right to purchase Dedicated Equipment under the procedure
               set out in Clause 13.2 below.

12.3      TERMINATION FOR INSOLVENCY
     Either party has the right to terminate this Agreement with immediate
     effect by notice if:

     12.3.1    a liquidator, administrative receiver, administrator or receiver
               is appointed (other than for the purpose of an amalgamation or
               reconstruction the terms of which have been

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               previously approved by the party having the right to terminate
               (such approval not to be unreasonably withheld or delayed in the
               case of a solvent amalgamation or reconstruction)) in respect of
               the whole or a material part of the assets and/or undertaking of
               the other party; or

     12.3.2    the other party enters into an arrangement or composition with
               its creditors, or if it becomes unable to pay its debts within
               the meaning of Section 123 of the Insolvency Act 1986.

12.4      SUSPENSION/TERMINATION OF INDIVIDUAL SERVICES

     12.4.1    CTI may suspend provision of the Services in whole or in part
               until further notice on notifying the BBC either orally
               (confirming such notification in writing), or in writing with
               immediate effect if: 


          (i)  CTI is entitled to terminate this Agreement; or

          (ii) CTI is obliged to comply with an order, instruction or request by
               any Government minister, the Home Office, the Channel Islands or
               Isle of Man authorities, an emergency services organisation or
               other competent administrative authority.

     12.4.2    If CTI exercises its right of suspension in respect of an event
               referred to in Clause 12.4.1(i), this will not exclude CTI's
               right to terminate this Agreement later in respect of that or any
               other event, nor will it prevent CTI from claiming damages from
               the BBC resulting from such event if the BBC is in breach of this
               Agreement.

     12.4.3    Notwithstanding Clause 12.4.1(ii), it is acknowledged that, in
               the event of an emergency, the respective obligations of the BBC
               and CTI will be governed by special arrangements under the
               relevant Emergency Powers and CTI agrees that it will not suspend
               service to the BBC other than on, or in order to comply with, the
               instructions by the relevant authorities in the event of an
               emergency.

12.5      FORCE MAJEURE

     12.5.1    In the event of the occurrence of a Force Majeure Event affecting
               either CTI or the BBC, the affected party shall give notice in
               writing thereof to the other party as soon as possible and shall
               likewise give notice on the cessation of the Force Majeure Event.
               The parties agree to discuss a course of action and to comply
               with any agreed course of action pursuant to Clause 12.5.2.
               Subject thereto, if the Force Majeure Event continues

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           for a period of more than 60 days following a failure to either agree
           a course of action under Clause 12.5.2 or to comply with such a
           course of action, then the non-defaulting party shall have the right
           to terminate where the Force Majeure Event affects all or
           substantially the whole of the Stations comprised in all or part of
           this Agreement, all or that part of this Agreement by not less than
           30 days' prior notice.

   12.5.2  Where a Force Majeure Event occurs, other than one affecting delivery
           of the Data to CTI for transmission which causes suspension of the
           Services, CTI will use its reasonable endeavors to continue to carry
           out the Services while any Force Majeure Event subsists. Where this
           is not possible, the BBC and CTI shall discuss and agree the most
           appropriate course of action to be taken for a resumption of the
           Services and/or the provision of a temporary service and the
           timescale within which such action is to be taken. If, having agreed
           a timescale for the resumption of any Service, CTI shall fail to
           comply with that timescale, not having agreed any extension of time
           where the failure is not itself caused by another Force Majeure
           Event, then the BBC shall be entitled to serve notice on CTI
           requiring that:

      (i)  in the case of a Force Majeure Event affecting the DTT Transmission
           Services, unless the DTT Transmission Services are resumed within a
           period of seven working days for an Operational Non-Priority Station
           and three working days for an Operational Priority Station from the
           date of delivery of the notice, then the BBC shall be entitled to
           receive Service Credits for that Station from the end of the seven-
           day or three-day period referred to above to the date on which the
           Services are resumed or a temporary service provided;

      (ii) in the case of a Force Majeure Event affecting the rollout of any
           Station, unless that Station is Accepted by the agreed revised Launch
           Date for that Station, CTI will be liable to pay liquidated damages
           in respect of that Station calculated in accordance with Clause 16.6.

   12.5.3  To the extent that any Force Majeure Event relates to the provision
           of either the Emergency Services or compliance by CTI with a
           direction under Section 94 of the Telecoms Act, the provisions of
           this Agreement relating to Emergency Services shall prevail and
           Clause 12.5 shall not take effect if it would only have taken effect
           by reason of events giving rise to the need for CTI to perform the
           Emergency Services or in accordance with the relevant direction.

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   12.5.4  Subject to Clause 12.5.2, neither party shall be liable to the other
           for any failure to perform its obligations (excluding payment
           obligations) under this Agreement where that failure is caused by a
           Force Majeure Event.

12.6  TERMINATION FOR BREACH

   12.6.1  If a party is in material breach of this Agreement (the "BREACHING
           PARTY"), the other party may give it a written notice requiring the
           breach to be remedied within 45 days.

   12.6.2  If the breach is material or could amount to a material breach if not
           remedied and, in either case, is remediable, and the Breaching Party
           fails to remedy the breach within the time specified in the notice
           requesting the breach to be remedied, then the non breaching party
           may terminate this Agreement immediately or on such longer period of
           notice as is specified in the notice of termination.

12.7  TERMINATION ON CHANGE OF CONTROL

   12.7.1  The BBC will be entitled to terminate this Agreement immediately by
           notice or on such period of notice as is specified in the notice of
           termination if there is a Change of Control of a Relevant Company
           other than on:

      (i)  a transfer of Shares between an existing shareholder in a Relevant
           Company and an Associate of such shareholder; or

      (ii) the creation of a mortgage, charge, encumbrance or security interest
           over or in respect of any Shares of a Relevant Company.

   12.7.2  CTI shall notify the BBC as soon as possible after it or any Relevant
           Company becomes aware of any Change of Control of a Relevant Company,
           or of any potential Change of Control or other circumstances which
           would or might give rise to a termination right under this Clause
           12.7.

   12.7.3  The BBC agrees that it will only exercise its rights to terminate
           pursuant to a Change of Control which arises in the circumstances set
           out in paragraph (i)(a) or (iii) of the definition of "Change of
           Control" set out in clause 12.7.4 if it reasonably considers that the
           event giving rise to such right is contrary to the BBC's corporate
           interests and/or those of Her Majesty's Government. The BBC agrees
           that a notice of termination (regardless of the period of notice set
           out in such notice), and whatever the circumstances giving rise to
           that right, will be given by the BBC within three months of

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           receipt of notice of the relevant event and may not be given
           thereafter. The BBC agrees to consider in good faith any requests for
           the sale of the Relevant Company's Shares or any other arrangement
           which might otherwise give rise to a termination right having regard
           to the reasonable interests of the BBC and each Relevant Company and
           those of Her Majesty's Government.

   12.7.4  For the purposes of this Clause 12.7: 

        "ACTING IN CONCERT" has the meaning given to it in The City Code on Take
        overs and Mergers;

        "ASSOCIATE" means, in relation to a person, (a) a subsidiary or holding
        company (as those terms are defined by Section 736 of the Companies Act
        1985) of that person or a subsidiary of that person's holding company (a
        "GROUP COMPANY"); (b) any limited partnership, the general partner of
        which is a Group Company; (c) any limited partner in any limited
        partnership, the general partner of which is a Group Company; (d) any
        fund managed or advised by a Group Company; (e) any employee of such
        person or any Group Company; or (f) who is a partnership, that
        partnership's constituent partners.

        "CONTROL" has the meaning given to it in Schedule 2, Part I paragraph
        (3)(b) of the Broadcasting Act 1990, as amended by the 1996 Act; and
        "Controlled" has a corresponding meaning;

        "CHANGE OF CONTROL" means in relation to a Relevant Company:

        (i)   before a Listing, where a Third Party acquires, obtains in any
              manner or in any circumstances comes to hold:

              (a)  Control of a Relevant Company;

              (b)  a Relevant Interest in a Relevant Company's Share capital; or

              (c)  such Interest in the Relevant Company's Share capital as
                   would, when taken with that already held by such Third Party
                   or by any Associate of, or person Controlled by or Acting in
                   Concert with, such Third Party, amount to a Relevant
                   Interest;

        (ii)  on or after a Listing, where a Third Party acquires, obtains in
              any manner or in any circumstances comes to hold:

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              (a) a Relevant interest in a Relevant Company's Share capital; or

              (b) such Interest in the Relevant Company's Share capital as
                  would, when taken with that already held by such Third Party
                  or by any Associate of, or person Controlled by or Acting in
                  Concert with, such Third Party, amount to a Relevant Interest;

        (iii) on or after a Listing, a Third Party, by itself or together with
              any persons Acting in Concert with it, obtaining in any manner or
              in any circumstances coming to hold an Interest in 25 per cent or
              more of the Shares of a Relevant Company and Control of the
              Relevant Company,

        PROVIDED THAT any scheme of arrangement for the purpose of
        reconstruction or reorganisation of the assets of a Relevant Company
        shall not, without further alteration in Control, constitute a Change of
        Control;

     "INTEREST" means, in relation to the Shares of a Relevant Company, any
     legal or beneficial interest in them, or any right or power (whether
     conditional or unconditional and whether legally enforceable or otherwise)
     to exercise control (directly or indirectly) over the disposal of those
     Shares or over the manner of exercise of any right to vote in a general
     meeting attached to such Shares;

     "LISTING" means the first listing of any of the Shares of any Relevant
     Company on any stock exchange or public dealings facility and "listed"
     shall be construed accordingly;

     "RELEVANT COMPANY" means CTI or any holding company (as that term is
     defined by Section 736 of the Companies Act 1985) of CTI;

     "RELEVANT INTEREST" means, in relation to any Shares of a Relevant Company
     an Interest in 30 per cent or more of the Relevant Company's Shares;

     "RELEVANT PERSON" means, in relation to a Relevant Company, any person or
     any one of two or more persons Acting in Concert who have Control of the
     Relevant Company;

     "SHARES" means, in relation to a Relevant Company, the shares in the
     relevant share capital (as that expression is defined in Section 198(2) of
     the Companies Act 1985) of that Relevant Company and shall include any
     shares which have been alloted (whether conditionally or unconditionally);
     and

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     "THIRD PARTY" means any person other than a Relevant Person or an Associate
     of a Relevant Person.

13   CONSEQUENCES OF EXPIRATION OR TERMINATION

13.1     ACCRUED RIGHTS

     Expiration or termination for whatever reason of this Agreement will not
     affect any rights of the parties which have accrued prior to the expiration
     or termination including, without limitation, any right to claim damages
     for breach of this Agreement.

13.2     RIGHT TO PURCHASE DEDICATED EQUIPMENT

     The provisions of this Clause 13.2 shall apply mainly in the event of
     termination of this Agreement by the BBC for breach by CTI pursuant to
     Clause 12.6 hereof.

     13.2.1  For purposes of this Clause 13-2:

         (i)     "DEDICATED EQUIPMENT" means the CTI Equipment and Third Party
                 Equipment.

         (ii)    "CTI EQUIPMENT" means any equipment owned by CTI and used by
                 CTI solely for purposes of providing the Services to the BBC.

         (iii)   "THIRD PARTY EQUIPMENT" means any equipment used (but not
                 owned) by CTI solely for the purposes of providing the Services
                 to the BBC.

         (iv)    "FAIR MARKET VALUE" means the market value for the Dedicated
                 Equipment. If the parties are unable to agree as to Fair Market
                 Value within what either party considers is a reasonable
                 timeframe, either party may refer the issue to an expert
                 accountant appointed by the Chairman of the Chartered Institute
                 of Accountants for adjudication and, subject to any manifest
                 error on the face of the determination, the parties will comply
                 with the terms of such determination and treat it as final. The
                 parties will bear their own costs of the adjudication and one
                 half of the costs of the adjudicator.

         (v)     "NET BOOK VALUE" means the value recorded in CTI's financial
                 accounts for the Dedicated Equipment in accordance with UK
                 GAAP.

     13.2.2      At least 90 days prior to the expiration or termination of this
                 Agreement or, where this Agreement is terminated on a shorter
                 period of notice, within 30 days of receipt of a

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                 notice of termination of this Agreement, CTI must, if requested
                 to do so by the BBC, provide the BBC with a list which:

          (i)    identifies the nature and location of the Dedicated Equipment;

          (ii)   gives the Net Book Value of the Dedicated Equipment at the date
                 on which the list is given;

          (iii)  identifies what rights CTI has in relation to the Dedicated
                 Equipment; and

          (iv)   identifies circumstances where transfer of such rights as CTI
                 has in the Third Party Dedicated Equipment to the BBC would
                 require the consent of a third party.

     13.2.3      Within 90 days of receipt of a list under Clause 13.2.2, the
                 BBC must advise CTI whether or not it wishes to acquire some or
                 all of the Dedicated Equipment. If the BBC does not respond
                 within 90 days of receipt of such list, then it will be deemed
                 to have elected not to purchase any of the Dedicated Equipment.
                 If the BBC does wish to acquire some or all of the Dedicated
                 Equipment, the following provisions will apply:

          (i)    Where all of CTI's rights in respect of the Dedicated Equipment
                 may be assigned or transferred to the BBC without the consent
                 of any other person, CTI must assign or transfer such rights to
                 the BBC if requested to do so by the BBC;

          (ii)   Where any of CTI's rights in respect of the Third Party
                 Equipment cannot be assigned or transferred to the BBC without
                 the consent of another person, CTI must if requested to do so
                 by the BBC use its reasonable endeavors to obtain, at such cost
                 as the parties agree to be reasonable in the circumstances, all
                 such consents and if such consents are obtained, CTI must then
                 assign or transfer such rights to the BBC.

          (iii)  The price payable by the BBC to CTI for the Dedicated Equipment
                 shall be the Fair Market Value. The BBC shall initially pay CTI
                 the Net Book Value in respect of the CTI Equipment and its fair
                 estimate of the Fair Market Value of the Third Party Equipment
                 (the "PROVISIONAL PAYMENT"). On making the Provisional Payment
                 to CTI the BBC shall be entitled to use the Dedicated Equipment
                 as if title had passed to it. Upon Fair Market Value being
                 determined by agreement or adjudication, as the case may be,
                 compensating payment shall be made within 30 days of this

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<PAGE>
 
               determination as necessary between CTI and the BBC to reflect the
               difference between the Provisional Payment and determined Fair
               Market Value.

        (iv)   Title to any Dedicated Equipment the ownership of which is
               transferred or assigned under this Clause 13.2 will transfer on
               payment of the compensating amount payable under Clause
               13.2.3(iii).

        (v)    CTI must deliver to the BBC such technical or user documentation
               relating to any Dedicated Equipment where the rights in that
               Dedicated Equipment are transferred or assigned to the BBC under
               this Clause 13.2.

        (vi)   The Dedicated Equipment will be sold "as is where is" without the
               benefit of any warranties or conditions whatsoever whether
               express or implied, other than the benefit of any warranties or
               conditions which are held by CTI and provided by a third party
               and which remain in force as at the date of the list, the benefit
               of which CTI will use reasonable endeavors to assign to the BBC.

        (vii)  CTI will, at the BBC's expense, detach and deliver the Dedicated
               Equipment as soon as reasonably practicable after title has
               passed.

13.3    HANDOVER AND EXIT MANAGEMENT

     13.3.1    If requested to do so by the BBC, CTI will continue to provide
               the Services to the BBC for a period of up to 6 months after
               expiration or termination of this Agreement on the terms of this
               Agreement, to allow the BBC to hand over responsibility of the
               Services to the BBC or a Successor Operator. During that 6 month
               period, the Charges payable by the BBC will be the Charges paid
               for the previous 6 months adjusted by reference to the RPI for
               the previous financial year.

     13.3.2    During the period prior to and for six months following
               expiration or termination of this Agreement CTI must at no cost
               to the BBC:

        (i)    co-operate fully with the BBC or a Successor Operator and use
               reasonable endeavors to ensure a seamless transition in passing
               responsibility for the Services to the BBC or a Successor
               Operator;

        (ii)   respond to reasonable questions and requests for assistance from
               the BBC or a Successor Operator in relation to the Services; and

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        (iii)  provide reasonable assistance to the BBC or a Successor Operator
               to enable them to obtain access to Stations and masts.

13.4    DETAILS OF EMPLOYEES

    Six months before the termination or assignment of this Agreement, or if
    this Agreement is terminated without notice for any reason as soon as
    reasonably practicable, but in either case if requested to do so by the BBC,
    CTI will provide, and will procure that any Relevant Employers will provide,
    to the BBC, or at the BBC's request to the Successor Operator, the following
    particulars of the Employees employed as at that date to the extent
    permitted by law:

    13.4.1  name, sex and the date on which continuity of employment began for
            each Employee for statutory purposes;

    13.4.2  the terms and conditions of employment of each such Employee;

    13.4.3  all payments, benefits or changes to terms and conditions of
            employment promised to any such Employee; 

    together with particulars of:

    13.4.4  dismissals of any other Employees or terminations of employment
            effected within 12 months of the Transfer Date;

    13.4.5  all agreements or arrangements entered into in relation to any such
            Employee between CTI or any other Relevant Employer and any trade
            union or association of trade unions or organisation or body of
            employees including elected representatives; and

    13.4.6  all strikes or other material industrial action taken by any such
            Employee within 12 months of the Transfer Date.

13.5    TRANSFER REGULATIONS

    13.5.1  On termination of this Agreement the Transfer Regulations may
            transfer the Relevant Employees to the BBC or the Successor
            Operator. If the Transfer Regulations have effect the following
            provisions shall apply:

        (i) the contract of employment of each of the Relevant Employees (save
            insofar as such contract relates to any occupational pension scheme)
            shall be transferred to the BBC or, as the case may be, the
            Successor Operator with effect from the Transfer Date which shall be
            the "time of transfer" under the Transfer Regulations;

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<PAGE>
 
        (ii)  CTI shall perform and discharge all its obligations in respect of
              all the Relevant Employees for its own account up to and including
              the Transfer Date including, without limitation, discharging all
              wages and salaries of the Relevant Employees, all employer's
              contributions to any relevant occupational pension scheme and all
              other costs and expenses related to their employment (including,
              without limitation, any taxation, accrued holiday pay, accrued
              bonus, commission or other sums payable in respect of service
              prior to the close of business on the Transfer Date) and shall
              indemnify the BBC or the Successor Operator, as the case may be,
              and keep the BBC or the Successor Operator indemnified against
              each and every action, proceeding, liability (including, without
              limitation, any taxation liability directly related to the
              Relevant Employees), cost, claim, expense (including, without
              limitation, reasonable legal fees), or demand arising from CTI's
              failure so to perform and discharge. The BBC shall, or, as the
              case may be, shall procure that the Successor Operator shall
              perform and discharge all such obligations from the Transfer Date;

        (iii) CTI shall indemnity (on an after-tax basis) the BBC or the
              Successor Operator, as the case may be, and keep the BBC or the
              Successor Operator so indemnified against each and every action,
              proceeding, cost, claim, liability (including, without limitation,
              any taxation liability directly related to the Relevant
              Employees), expense (including, without limitation, reasonable
              legal fees) or demand which relates to or arises out of any act or
              omission by CTI or any other event or occurrence prior to the
              Transfer Date and which the BBC or the Successor Operator, as the
              case may be, may incur in relation to any contract of employment
              or collective agreement concerning one or more of the Relevant
              Employees pursuant to the provisions of the Transfer Regulations
              or otherwise including, without limitation, any such matter
              relating to or arising out of:

              (a)  CTI's rights, powers, duties and/or liabilities (including,
                   without limitation, any taxation) under or by virtue of any
                   such contract of employment or collective agreement, which
                   rights, powers, duties and/or liabilities (as the case may
                   be) are or will be transferred to the BBC or the Successor
                   Operator in accordance with the Transfer Regulations; or

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<PAGE>
 
              (b)  anything done or omitted before the Transfer Date by or in
                   relation to CTI in respect of any such contract of employment
                   or collective agreement or any Relevant Employee, which is
                   deemed by the Transfer Regulations to have been done or
                   omitted by or in relation to the BBC or the Successor
                   Operator;

        (iv)  if any contract of employment or collective agreement which is not
              in accordance with Clause 13.4 above disclosed in writing to the
              BBC, or at its request to the Successor Operator, by CTI prior to
              the Transfer Date shall have effect as if originally made between
              the BBC or the Successor Operator and any employee ("UNDISCLOSED
              EMPLOYEE") or a trade union as a result of the provisions of the
              Transfer Regulations (without prejudice to any other right or
              remedy which may be available to the BBC or the Successor
              Operator):

        (a)   the BBC or the Successor Operator may, within 3 months of the
              Transfer Date upon becoming aware of the application of the
              Transfer Regulations to any such contract of employment or
              collective agreement, terminate such contract or agreement
              forthwith, and CTI shall indemnify the BBC or the Successor
              Operator (on an after-tax basis) in respect of any Undisclosed
              Employee so dismissed on the same terms mutatis mutandis as CTI
              has indemnified the BBC or the Successor Operator in respect of a
              Relevant Employee pursuant to the terms of Clause 13.5.1 (ii) and
              13.5.1 (iii); and

        (b)   CTI shall indemnify the BBC or the Successor Operator (on an 
              after-tax basis) against each and every action, proceeding, cost,
              claim, liability (including, without limitation, reasonable legal
              fees) or demand relating to or arising out of such termination and
              reimburse the BBC or the Successor Operator for all costs and
              expenses (including, without limitation, any taxation) incurred in
              employing such employee in respect of his employment following the
              Transfer Date;

        (v)   CTI shall indemnify (on an after tax-basis) the BBC or the
              Successor Operator and keep the BBC or the Successor Operator so
              indemnified against each and every action, proceeding, cost,
              claim, liability (including, without limitation, any taxation),
              expense (including, without limitation, reasonable legal fees) or
              demand which relates to or arises out of any dismissal (including,
              without limitation, constructive dismissal) by CTI of any employee
              (not being a Relevant Employee) which the BBC

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<PAGE>
 
               or the Successor Operator may incur pursuant to the provisions of
               the Transfer Regulations;

          (vi) If CTI assigns this Agreement to the CTI Assignee, or sub-
               contracts its obligations under this Agreement in respect of all
               or part of the Services to any firm, person or company (the "CTI
               SUB-CONTRACTOR"), CTI shall procure that the CTI Assignee or, as
               the case may be, the CTI Sub-Contractor will indemnify the BBC
               and the Successor Operator in the same terms, mutatis mutandis,
               as CTI has indemnified the BBC and the Successor Operator in this
               Clause 13.5.1.

     13.5.2    In Clause 13.5.1 the undertakings and indemnities given by CTI to
               the Successor Operator shall be given to the BBC for itself and
               as trustee for any BBC Assignee or the Successor Operator.

13.6      REDUNDANCY COSTS

     13.6.1    In this clause "REDUNDANCY COSTS" means notice pay, statutory
               redundancy pay, contractual redundancy pay and any Losses
               incurred by the BBC or a Successor Operator in connection with
               any claims arising out of or in connection with the dismissal of
               any Relevant Employee pursuant to Clause 13.6.2.

     13.6.2    The CTI will reimburse to the BBC or, as the case may be, a
               Successor Operator the Redundancy Costs incurred by the BBC or
               such Successor Operator in connection with the dismissal by
               reason of redundancy, reconstruction or reorganisation of any
               Relevant Employee within twelve months of the expiry or earlier
               termination of this Agreement and will make such reimbursement
               within 28 days of being notified of such Redundancy Costs. The
               undertakings given in this Clause 13.6.2 to the Successor
               Operator shall be given to the BBC for itself and as trustee for
               the Successor Operator.

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                 PART G - LIABILITY, WARRANTIES AND INSURANCE

14   WARRANTIES AND UNDERTAKINGS

14.1      CTI hereby warrants and undertakes that it has applied for, and the
          Radiocommunications Agency has agreed to grant, conditional only on
          execution of this Agreement, or will grant by the time required by
          law, and will hold during the Term, all necessary licences and
          consents under the Telecoms Act and the WTA and, subject to Clause
          4.4, all consents and clearances of whatever nature as are required to
          enable it to perform its obligations under this Agreement (other than
          frequency allocation and clearances which it is the BBC's obligation
          to obtain) and shall comply with the terms of all such licences,
          clearances and consents and shall not do anything or omit to do
          anything which would cause such licences, clearances or consents to be
          revoked or not renewed.

14.2      The BBC shall obtain at its own expense and hold during the Term all
          necessary licences and consents under the Charter and DNH Agreement,
          the Broadcasting Act, the 1996 Act, the WTA and the Telecoms Act and
          all consents, clearances and other rights of whatsoever nature
          including, without limitation, any necessary licence and consent which
          the BBC may require in relation to the BBC Multiplex which in each
          case are required to permit the BBC to perform its obligations under
          this Agreement and otherwise and shall do all things necessary to
          comply with the terms of such licences, clearances and consents and
          shall not do anything or omit to do anything which would cause such
          licences, clearances and consents to be revoked or not renewed.

14.3      CTI shall do all things reasonably necessary to renew any leases or
          licences for the sites on which the Stations are located, so that they
          subsist for the duration of this Agreement or any agreed renewal of
          the same.

15   INSURANCE

15.1      Both parties must maintain insurance against any loss, damages, claims
          or actions arising from:

     15.1.1    personal injury or death;

     15.1.2    public liability; and/or

     15.1.3    any other liability for which either is required by law to
               insure,

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               arising out of the performance of this Agreement.

15.2      CTI must maintain insurance cover adequate to cover the risks which it
          is likely to incur in relation to the subject matter of this
          Agreement, with a minimum of:

     15.2.1    primary public and product liability insurance in a form
               reasonably acceptable to the BBC providing for payment of a sum
               up to (Pounds)50 million for any one occurrence (or in the annual
               aggregate for product liability) and, in the case of third party
               property damage arising out of the use of private vehicles,
               unlimited cover and, in the case of third party property damage,
               arising out of the use of commercial vehicles, (Pounds)5 million
               in respect of one occurrence;

     15.2.2    employer's liability insurance sufficient to meet its statutory
               requirements and sufficient to cover any liabilities to past or
               present employees;

     15.2.3    all risks or loss or damage to property and business interruption
               insurance in a form reasonably acceptable to the BBC in respect
               of each of the Stations, the CTI Sites and all equipment used to
               provide the Services covering the full reinstatement value of all
               such assets and the reasonable cost of any replacement
               transmission services from the Stations or any other stations
               used to supply any part of the DTT Transmission Services; and

     15.2.4    professional indemnity insurance of at least (Pounds)5 million
               per year, commensurate with the nature of the risks undertaken in
               that year.

15.3      Where requested by the BBC, CTI agrees to provide the BBC with a copy
          of the relevant policy or policies or evidence of such insurance and
          its material terms referred to in this Clause 15 which shall be
          treated as Confidential Information belonging to CTI. CTI will also
          notify the BBC of any substantive change to the insurance programme
          maintained by it and referred to in this Clause 15 for the risks
          covered.

15.4      Where CTI engages a sub-contractor, it shall ensure that its insurance
          includes cover for its liabilities in respect of the acts and
          omissions of its sub-contractors or that its sub-contractors have
          their own insurance with appropriate cover in the light of the work to
          be undertaken by the sub-contractors.

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16   LIABILITY AND WARRANTIES

16.1      For purposes of this Clause 16, "CONTRACTS" means this Agreement, any
          Site Sharing Agreement entered into pursuant to this Agreement and any
          other agreement between the parties relating to the subject matter of
          this Agreement.

16.2      PERSONAL INJURY AND DAMAGE TO PROPERTY

     16.2.1     Each of the BBC and CTI shall indemnify the other on an after-
                tax basis against all claims or actions brought against the
                other by any third party relating to:

          (i)   personal injury; or

          (ii)  loss of, or damage to, property; or

          (iii) Harmful Interference caused to analogue or digital broadcasts,
                excepting any such claims made by viewers;

          caused as a result of any breach of this Agreement or any wilful or
          negligent act or wilful or negligent omission by the party from whom
          indemnification is sought. Without limiting the generality of this
          Clause 16.2.1, CTI will indemnify the BBC on an after-tax basis
          against any claims made against the BBC by any party as a result of
          damage caused by CTI to the property of that party in installing,
          maintaining or operating transmitters for provision of the DTT
          Transmission Services.

     16.2.2     Each of the BBC and CTI will indemnify the other on an after-tax
                basis against any loss incurred by the relevant party resulting
                from damage to that party's property or injury to its employees
                or the employees of its agents or sub-contractors arising out of
                any breach of any of its obligations, warranties or undertakings
                contained in any of the Contracts or any other agreements
                between the parties relating to the provision of the Services or
                any other negligent or wilful act or omission of the party from
                whom an indemnity is sought.

     16.2.3     The party from whom indemnification is sought shall have the
                right to conduct any proceedings brought by a third party
                against the other party or to settle any such proceedings
                subject to reimbursing the other party any costs of such
                proceedings and any damages, costs and expenses payable by the
                indemnified party arising out of those proceedings. Both parties
                will notify the other as soon as possible of the existence of a

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               claim which is reasonably likely to give rise to a claim for
               indemnification under this Clause 16.2.

     16.2.4    Neither party excludes or restricts liability for death or
               personal injury resulting from its own negligence or from
               liability arising under the Health and Safety at Work Act 1974 or
               any regulations made pursuant to that Act.

16.3      THIRD PARTY ACTS

     Neither CTI nor the BBC shall be held responsible for the consequences of
     any act or omission or misconduct of any third party, unless:

     16.3.1    such third parties are in the employment of or providing sub-
               contracted services to either CTI or the BBC at the time the
               lncident takes place; or

     16.3.2    the party claimed against has recovered damages in respect of
               such act, omission or misconduct directly from the relevant third
               party or otherwise where it has recovered insurance (and in each
               such case to the extent of such recovery or insurance claim)
               provided that where such party is entitled to claim damages
               and/or recover under such insurance policy it shall use all
               reasonable endeavours to do so as soon as reasonably practicable.

16.4      BBC LIABILITY

     16.4.1    The BBC shall not be liable, whether in contract, tort,
               negligence, breach of statutory duty or otherwise, to CTI for
               loss of profits other than any element of profit comprised in the
               Charges or for any indirect, special, incidental or consequential
               loss whatsoever arising out of its performance of or failure to
               perform any of the Contracts or otherwise.

     16.4.2    The BBC's liability for all matters under the Contracts, other
               than for payment of the Charges under this Agreement or for
               payment of any of the termination sums provided for in Clause
               12.2 or for any sums payable in respect of the Dedicated
               Equipment or in respect of the repudiatory breach of any of the
               Contracts or in respect of the content indemnity contained in
               Clause 4.2.3, shall be limited to [*] in any Year or, if greater,
               the amount recovered by the BBC in respect of and to the extent
               attributable to such loss pursuant to any insurance policy
               maintained by the BBC.

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

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16.5      CTI LIABILITY

     16.5.1    CTI's total aggregate liability in respect of all matters under
               or arising out of the Contracts in any one Year, including in
               relation to the payment of liquidated damages and/or Service
               Credits, will be limited to [*].

     16.5.2    CTI shall not be liable, whether in contract, tort, negligence,
               breach of statutory duty or otherwise, to the BBC for loss of
               profits or for any indirect, special, incidental or consequential
               loss whatsoever whether incurred by the BBC or a third party
               arising out of its performance of or failure to perform any of
               its obligations under the Contracts or otherwise .

     16.5.3    For the avoidance of doubt, CTI is liable to pay to the BBC any
               liquidated damages and/or Service Credits payable in accordance
               with this Agreement.

     16.5.4    This Agreement and the Site Sharing Agreement sets out the full
               extent of each party's obligations and liabilities relating to
               the Services whether in contract, tort, negligence, breach of
               statutory duty or otherwise. In particular, there are no
               conditions, warranties or other terms, express or implied, as to
               satisfactory quality, fitness for purpose or of any other kind
               whatsoever which are binding on CTI except as specifically set
               out in this Agreement. Any other condition, warranty or other
               term relating to the provision of the Services or the sale of the
               Dedicated Equipment which might otherwise have been implied into
               this Agreement by statute, common law or otherwise is hereby
               excluded.

16.6      DELAY

     16.6.1    If a Phase 1 Station is not Accepted by the Phase 1 Launch Date
               for that Station, then CTI must pay to the BBC liquidated damages
               to be calculated in accordance with Paragraph 5 of Schedule 2,
               subject to Clauses 2.5.2 and 16.6.4.

     16.6.2    CTI acknowledges that the liquidated damages payable under Clause
               16.6.1 are a reasonable pre-estimate of the damages that the BBC
               may sustain if there is any failure to comply with the terms of
               this Agreement.

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      66
<PAGE>
 
     16.6.3    The BBC's right to claim liquidated damages under Clause 16.6
               shall be without prejudice to any other right which the BBC may
               have.

     16.6.4    CTI's total aggregate liability in respect of all claims by the
               BBC for payment of liquidated damages under this Agreement shall
               be limited to the sum of [*].

     16.6.5    To the extent that any delay in the Acceptance of any Station is
               due to a new-technology problem which does not arise through any
               fault of CTI and is beyond CTI's reasonable control, the BBC will
               waive its right to the payment of liquidated damages for the
               period beginning on the date on which the BBC and CTI have agreed
               in good faith a process to resolve the problem and ending on the
               date that CTI has achieved a workable solution to such a problem,
               provided always that CTI has at all times used all reasonable
               efforts to achieve such solution as soon as is reasonably
               possible.

16.7      WARRANTIES

     16.7.1      CTI warrants and represents that:

          (i)    it has full power and authority to execute, deliver and perform
                 its obligations under this Agreement;

          (ii)   the Services will be of satisfactory quality and fit for the
                 purpose for which they are supplied and without limiting the
                 generality of the foregoing, will comply with Schedule 5;

          (iii)  all work performed under this Agreement will be performed in a
                 proper and workmanlike manner and with due skill and care;

          (iv)   it has and will have throughout the term of this Agreement the
                 necessary skills, expertise and resources to perform its
                 obligations under this Agreement;

          (v)    all personnel employed by CTI in the performance of its
                 obligations under this Agreement will be appropriately trained
                 and experienced;

          (vi)   it is not currently a party to and will not enter into any
                 agreements or arrangements with third parties the terms of
                 which prevent it entering into this Agreement or would impede
                 the substantial performance of its obligations under this
                 Agreement; and

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      67
<PAGE>
 
          (vii)  it has disclosed no Confidential Information as described in
                 Clause 19.1 to any third party in breach of any obligations of
                 confidentiality.

     16.7.2      The BBC warrants and represents that:

          (i)    it has full power and authority to execute, deliver and perform
                 its obligations under this Agreement; and

          (ii)   it has disclosed no Confidential Information as described in
                 Clause 19.1 to any third party in breach of any obligations of
                 confidentiality.

     16.7.3      There are no conditions or warranties, express or implied,
                 binding on CTI or the BBC except those set out in this
                 Agreement. Any condition or warranty which might have been
                 implied into this Agreement by statute, common law or otherwise
                 is hereby excluded.

                                      68
<PAGE>
 
                               PART H - GENERAL
17   ASSIGNMENT

17.1      This Agreement is personal to the pates hereto and they shall not
          assign, transfer, charge or deal in any other manner with this
          Agreement other than as expressly set out below except that CTI shall
          be entitled to assign its rights to payments under this Agreement by
          way of security to any person providing finance to it or its holding
          company(ies).

17.2      Each of CTI and the BBC shall be entitled to transfer this Agreement
          to any of its wholly-owned subsidiaries provided that:

     17.2.1    each party procures that the transferee is bound by a direct
               covenant with the other party to observe all the terms of this
               Agreement and the covenants and obligations by the transferor
               contained in this Agreement; and

     17.2.2    if any transferee ceases to be a wholly-owned subsidiary of
               either the BBC or CTI, as the case may be, this Agreement will be
               transferred back to CTI or the BBC, or to one of their wholly-
               owned subsidiaries.

18   SUB-CONTRACTING

     CTI may sub-contract any of its obligations under this Agreement. CTI will
     not be relieved of any of its liabilities or obligations under this
     Agreement by entering into sub-contracts and CTI will be liable to the BBC
     for the acts, defaults and neglects of any sub-contractor or any employee
     or agent of the sub-contractor as fully as if they were the acts, defaults
     or neglects of CTI or the employees or agents of CTI.

19   INFORMATION AND CONFIDENTIALITY

19.1      Subject to the terms of any other agreement between the parties, each
          party agrees and undertakes that during the term of this Agreement,
          and thereafter, it will keep confidential and will not use for its own
          purposes or, without the prior written consent of the other, disclose
          to any third party the terms of this Agreement or any information of a
          confidential nature which is supplied to it under this Agreement or of
          which it becomes aware in the performance of this Agreement unless:

                                      69
<PAGE>
 
     19.1.1    such information is required to be disclosed to CTI's bankers,
               CTI's holding company and any shareholders of its holding company
               (subject in each case to such companies or individuals agreeing
               that the information shall be confidential in terms substantially
               similar to this Clause 19.1); or

     19.1.2    such information is public knowledge, or subsequently becomes
               public knowledge, other than by breach of this Agreement; or

     19.1.3    such information subsequently comes lawfully into the possession
               of the party in question from a third party; or

     19.1.4    the disclosure of such information is required by any court of
               competent jurisdiction or any regulatory authority, including any
               recognized stock exchange or any taxation authority.

19.2      To the extent that it is necessary to disclose confidential
          information pursuant to the provisions of this Clause 19 or otherwise
          as necessary to implement the provisions of this Agreement, either
          party may disclose any confidential information concerning this
          Agreement to such of its employees or, in the case of the BBC, to such
          of the BBC's nominated contractor(s) as may be reasonably necessary on
          a "need-to-know basis", provided that before any such disclosure such
          party shall make such persons aware of its obligations of
          confidentiality under this Agreement and shall at all times procure
          compliance by such persons therewith.

19.3      The obligations of confidentiality hereunder shall not apply to
          prevent the supply of confidential information to the Department of
          Culture, Media and Sport, the Home Office, the Cabinet Office, the
          Foreign and Commonwealth Office, the Comptroller and Auditor General,
          the Office of Fair Trading, the Radiocommunications Agency, the
          Department for Trade and Industry, the Independent Television
          Commission, the Office of Telecommunications or any other regulatory
          body.

20   INTELLECTUAL PROPERTY RIGHTS

20.1      If in the course of the provision of the Services any material is
          created by CTI which is protected by copyright or other intellectual
          property rights, all legal and beneficial interests in those
          intellectual property rights will, as between the BBC and CTI, be
          owned by CTI. The BBC will only have such rights as are set out in
          this Clause 20 in relation to such materials.

                                      70
<PAGE>
 
20.2      CTI warrants and undertakes to the BBC that the use by the BBC of the
          Services and the Transmission Network in accordance with the terms of
          this Agreement will not infringe the intellectual property rights of
          any party.

20.3      CTI will indemnify the BBC on an after-tax basis against any loss,
          damage, or expenses (including legal fees on an indemnity basis) which
          the BBC may suffer or incur as a result of any claim that the
          Services, the Transmission Network or any component of the
          Transmission Network infringes the intellectual property rights of any
          third party.

20.4      Each party must notify the other as soon as reasonably practicable:

     20.4.1    after becoming aware of any infringement or suspected
               infringement by the Services, the Transmission Network or any
               component of the Transmission Network of the intellectual
               property rights of any third Party; and

     20.4.2    of any claim being made of the type described in Clause 20.3.

20.5      The BBC must not make any admission relating to a claim under Clause
          20.3, and must give CTI all reasonable assistance (including providing
          all relevant information) in respect of such a claim at CTI's cost.
          The BBC will take all such action as CTI may reasonably request to
          avoid, dispute, resist, appeal, compromise or contest any such claim
          at CTI's cost.

21   EMPLOYEES

21.1      TERMS OF EMPLOYMENT OF EXISTING EMPLOYEES

     CTI shall not, and shall procure that any other Relevant Employer shall
     not, without the prior consent of the BBC (which shall not be unreasonably
     withheld or delayed), vary, or purport or promise to vary, the terms or
     conditions (as amended from time to time) of employment of any Employee
     (including a promise to make any additional payment or provide any
     additional benefit) where such variation or addition:

     21.1.1    takes effect at any time after either party has served a notice
               terminating this Agreement unless it is in the ordinary course of
               business and, when aggregated with any other variation or
               addition which takes effect during such period, represents an
               increase in the remuneration of the Employee of no more than the
               percentage increase

                                      71
<PAGE>
 
               in the level of the Average Earnings Index between the month for
               which such index was last published at the time the variation or
               addition is made or proposed and the month failing 12 months
               before such month; or

     21.1.2    first takes effect in whole or in part after this Agreement has
               terminated; or

     21.1.3    results in any such employment not being terminable by the
               Relevant Employer within six months after this Agreement has
               terminated; or

     21.1.4    relates to a payment or the provision of a material benefit
               triggered by termination of employment after this Agreement has
               terminated; or

     21.1.5    relates to the provision of a benefit (but excluding base salary)
               which takes effect at any time after either party has served a
               notice terminating this Agreement or which any such Employee will
               or may have a contractual right to first receive after this
               Agreement has terminated; or

     21.1.6    prevents, restricts or hinders any such Employee after this
               Agreement has terminated from working for the BBC or the
               Successor Operator or from performing the duties such Employee
               performed for CTI.

21.2      CHANGES IN NUMBERS AND TOTAL COST OF EMPLOYEES

     Subject to and excluding any increase in the remuneration of Employees
     permitted under Clause 21.1, CTI shall not, and shall procure that any
     other Relevant Employer shall not, without the prior consent of the BBC
     (which shall not be unreasonably withheld or delayed), increase or decrease
     at any time after either party has served a notice terminating this
     Agreement the number of Employees either such that the total number of
     Employees or the total cost per annum to CTI and each other Relevant
     Employer of employing all Employees is increased or such that the total
     number of Employees is decreased, in each case, by more than 5 per cent
     during any period of 12 months.

22   NOTICES

22.1      Any notice to be served by either party shall be in writing and shall
          be sent to the following addresses:

                                      72
<PAGE>
 
     CTI       Chief Executive Officer
               Castle Transmission International Ltd
               Warwick Technology Park
               Gallows Hill
               Heathcote Lane
               Warwick CV34 6TN
               Fax No: 01926 416006

     BBC       Director of Policy and Planning
               British Broadcasting Corporation
               Broadcasting House
               London W1A 1AA
               Fax No: 0171 436 0393 Copy to: the BBC Representative

22.2      Any notice, invoice or other document which may be given by either
          party under this Agreement will be deemed to have been duly given if
          left at or sent by post (whether by letter or, where the parties agree
          in writing, in any other form) or facsimile transmission to the
          address set out above or to any other address notified to each other
          in writing in accordance with this Clause as an address to which
          notices, invoices and other documents may be sent. Any such
          communication will be deemed to have been made to the other party:

     22.2.1    if sent by hand, when delivered;

     22.2.2    if sent by post, 72 hours after the envelope containing such
               notice was posted; or

     22.2.3    if sent by facsimile, when the transmission of the facsimile is
               confirmed delivered complete, if delivered on a business day, or,
               if not, at 9.30 a.m. (British Standard Time) on the next business
               day.

     For the purposes of this Clause, "BUSINESS DAY" means 9 a.m. to 5 p.m.
     Monday to Friday every week of the year except for English public holidays.
     It is further agreed that notices sent by facsimile will also be confirmed
     by sending a signed copy by post, the copy to be posted within 24 hours of
     sending the facsimile.

                                      73
<PAGE>
 
23   NON-SOLICITATION

     Neither the BBC nor CTI shall offer employment or engage any employee of
     the other involved in the provision of the Services whilst engaged, or
     within 12 months of his ceasing to be engaged, in carrying out any
     obligations under this Agreement without the prior written consent of the
     other. This prohibition shall not prevent either party advertising for
     staff in the national, local or industry press.

24   RESTRICTIVE TRADE PRACTICES

     Notwithstanding any other provision of this Agreement, no provision of this
     Agreement which is of such a nature as to make this Agreement, or any
     agreement or arrangement of which this Agreement forms part, liable to
     registration under the Restrictive Trade Practices Act 1976 shall take
     effect until the day after that on which particulars thereof have been duly
     furnished to the Director General of Fair Trading.

25   WHOLE AGREEMENT

     This Agreement supersedes any previous written or oral agreement between
     the parties in relation to the matters dealt with in this Agreement and,
     together with its Schedules, contains the whole agreement between the
     parties relating to the subject matter of this Agreement at the date hereof
     to the exclusion of any terms implied by law which may be excluded by
     contract. Each of the parties acknowledges that it has not been induced to
     enter into this Agreement by a representation, warranty or undertaking not
     expressly incorporated into it. So far as permitted by law and except in
     the case of fraud, the parties agree and acknowledge that their only rights
     and remedies in relation to any representation, warranty or undertaking
     made or given in connection with this Agreement shall be for breach of the
     terms of this Agreement, to the exclusion of all other rights and remedies
     (including those in tort or arising under statute).

26   VALUE ADDED TAX

26.1      All sums due to either party under this Agreement are exclusive of VAT
          thereon, if any, which shall be charged in addition thereto in
          accordance with the relevant law in force at the time of making the
          relevant taxable supply and shall be payable by the paying party only
          against receipt from the other of a valid VAT invoice in respect
          thereof. 

                                      74
<PAGE>
 
26.2      Where under this Agreement one party has agreed to reimburse or
          indemnify the other in respect of any payment made or cost incurred by
          the other, then the first party shall also reimburse any VAT paid by
          the other which forms part of its payment or costs incurred to the
          extent that such VAT is not available for credit for the other (or for
          the representative member of the other's VAT group) under Sections 25
          and 26 of the Value Added Tax Act 1994 (or any replacement or
          equivalent provision).

27   PARENT COMPANY GUARANTEE

     CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD will enter into a guarantee in
     the form set out in Schedule 9.

28   JURISDICTION

     This Agreement will be governed by and construed and interpreted in
     accordance with English law, and the parties hereby submit to the non-
     exclusive jurisdiction of the English courts.

     IN WITNESS whereof this document has teen executed the day and year first
     before written.

          SIGNED for the BRITISH            }  
          BROADCASTING CORPORATION by:



     In the presence of:



          SIGNED for CASTLE TRANSMISSION    }     
          INTERNATIONAL LTD by:


     In the presence of:

                                      75
<PAGE>
 
                                  SCHEDULE 1

                                   STATIONS

1.   THE STATIONS
1.1. The Stations listed in this schedule constitute the "Stations" for
     purposes of this Agreement.

2.   TIMETABLE

2.1. Phase I Stations (including those at which test transmitters agree to be
     installed), Phase 2 and Phase 3 Stations are identified in Table I below,
     as is the Build Date and Phase I Launch Date or Phase 2 and Phase 3 Service
     Date (as the case may be) for each Station and the Test Date for test
     transmitters.

3.   CHANNELS AND ERP
3.1. The BBC has been allocated multiplex 1 and the table shows the
     corresponding channel and ERP for multiplex 1 for each Station.

     NOTES AND ABBREVIATIONS IN TABLE 1

     NOTE 1:  ABBREVIATION
     *XYZ * =  "Must have at Launch".

     NOTE 2:  ITC PHASE
     T = Test Transmitter

     NOTE 3:  BUILD & CONTRACTUAL SERVICE
     Build and Contractual Service dates are defined in the main Contract.
 
      .    LDI    Phase I Launch Date

      .    LD1 + [2] etc  Launch Date plus [2] months

     NOTE 4 : OPERATIONAL AND RESPONSE TARGET
     See Schedule 8, for definition of Operational Priority and Response Target
     stations.

     NOTE 5: BBC, ITV, CH4 AND SDN REGIONS
 
<TABLE>
       <S>      <C>                 <C>    <C>                <C>    <C> 
       ----------------------------------------------------------------------------------- 
       Ang      Anglia              Meri   Meridian           SE     SouthEast      
       Bord     Border              Mid    Midlands           Sth    South               
       C/LWT    Carlton/LWT         N      North              SW     South West           
       Central  Central             NE     North East         TTT    Tyne Tees Television
       ChTv     Channel Television  NI     Northern Ireland   U      Ulster                
       E        East                Nth    North              UTV    Ulster Television   
       EMid     East Midlands       NW     North West         W      West                  
       Gram     Grampian            R1     Region 1           WA     West Anglia          
       Gran     Granada             R2     Region 2           WC     West Country         
       HTVB     HTV Bristol         R3     Region 3           Wls    Wales               
       HTVC     HTV Cardiff         S      Scotland           York   Yorkshire          
       L        London              Scd    Scotland           -          -
       M        Midlands            Scot   Scottish           -          - 
       ----------------------------------------------------------------------------------- 
</TABLE> 

     NOTE 6:  ITC DESIGNATION
      .   M = Main Station
      .   R = Relay

                                       1
<PAGE>
 
     NOTE 7: BBC TRANSPORT STREAM SOURCE

     BOLD = BBC Studio Centre

<TABLE> 
        <S>     <C>           <C>   <C>           <C>    <C>  
        ------------------------------------------------------------------- 
          BE    BELFAST       GW    GLASGOW       NT     NEWCASTLE              
          BM    BIRMINGHAM    LS    LEEDS         PY     PLYMOUTH         
          BS    BRISTOL       MR    MANCHESTER    SO     SOUTHAMPTON      
          CB    CAMBRIDGE     NC    NORWICH       TC     TELEVISION CENTRE
          CF    CARDIFF       NO    NOTTINGHAM    -      - 
        ------------------------------------------------------------------- 
</TABLE> 

     NOTE 8: HIGH LEVEL DESIGN CATEGORIES

<TABLE>
<CAPTION>
<S>               <C>                       <C> 
- ----------------------------------------------------------------------------- 
 First Letter     SI Insertion              S = SI Insertion Station
- ----------------------------------------------------------------------------- 
 Second           Transmitter Power         H = High (greater than 66OW)
 Letter                                     L = Low (less than 66OW)
 
- -----------------------------------------------------------------------------
 Third Letter     Combiner Type             S = Single Ended
                                            D = Duplicated
- ----------------------------------------------------------------------------- 
 Fourth Letter    Antenna type              A = Existing Analogue antenna++
                                            N =-New Digital antenna
- -----------------------------------------------------------------------------
</TABLE>

++   The analogue antenna may be an existing C5 antenna at certain sites,
     currently Craigkelly and Darvel.

                                       2
<PAGE>
 
                                    TABLE 1

                                       3
<PAGE>
 
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------------  
        DTT TRANSMISSION                                                                       ROLL-OUT            PRIORITY  
- --------------------------------------------------------------------------------------------------------------------------------  
                                                             Coverage                                                          
                                               UHF             (000'            ITC                                              
STATION                 Abbreviation         Channel       proportional)       Phase                              Operational   
- -------------------------------------------------------------------------------------------------------------------------------- 
KEYS: SEE NOTE               [1]                                                [2]         [*]           [*]         [4]       
<S>                     <C>                  <C>           <C>                 <C>          <C>           <C>     <C>    
- -------------------------------------------------------------------------------------------------------------------------------- 
ABERDARE                     ABR                28              56               3          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
ANGUS                        AGU                68             434               2          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
BEACON HILL                  BNL                52             228               2          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
BELMONT                     *BMN*               30           2,019               1          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
BILSDALE                     BIL                34           1,483               1          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
BLACK HILL                  *BKH*               41           1,526               1          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
BLAENPLWYF                   BY                 28              49               2          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
BLUEBELL HILL                BBL                59           1,334               2          [*]           [*]          X        
- -------------------------------------------------------------------------------------------------------------------------------- 
BRESSAY                      BRQ                21              12               3          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
BRIERLEY HILL                BOF                68              95               3          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
BRISTOL IC                   BSL                49             160               2          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
BRISTOL KW                   BSK                22              98               3          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
BROMSGROVE                   BGE                34             104               3          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
BROUGHER MTN.                BRM                30              56               3          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
CALDBECK                    *CDK*               25             323               1          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
CARADON HILL                *CNH*               34             309               1          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
CARMEL                       CRL                55             181               2          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
CHATTON                      CHN                40             242               3          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
CHESTERFIELD                 CD                 34             255               3          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
CRAIGKELLY                   CGK                33             578               1          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
CRYSTAL PALACE              *CP*                25           8,501               1          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
DARVEL                       DVL                22             512               2          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
DIVIS                       *DIV*               29           1,122               1          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
DOVER                        DOV                68             547               2          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
DURRIS                      *DUS*               30             368               1          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
EITSHAL                      ETL                34              19               3          [*]           [*]                   
- -------------------------------------------------------------------------------------------------------------------------------- 
EMLEY MOOR                  *MLM*               52           2,099              1T          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 
FENHAM                       FNH                30             304               2          [*]           [*]          x        
- -------------------------------------------------------------------------------------------------------------------------------- 

<CAPTION> 
- -------------------------------------------------------------------------------------------------------------------------------- 
  DTT TRANSMISSION  PRIORITY                            REGION                      SITE                       DESIGN
- -------------------------------------------------------------------------------------------------------------------------------- 
                  CONTRACTUAL                                                                                                   
                   RESPONSE                                                               ITC          BBC     GENERIC     ERP  
STATION              TIME          BBC     CHANNEL 4     ITV       SDN       LANDLORD  DESIGNATION    STUDIO   SOURCE      (KW) 
- -------------------------------------------------------------------------------------------------------------------------------- 
KEYS: SEE NOTE        [4]           [5]       [5]        [5]        [5]                     [6]         [7]      [8]
<S>               <C>              <C>     <C>          <C>        <C>       <C>       <C>            <C>      <C>        <C>   
- -------------------------------------------------------------------------------------------------------------------------------- 
ABERDARE                            Wls        E        HTV C        R1         CT1          R           CF      _LSA      0.050
- -------------------------------------------------------------------------------------------------------------------------------- 
ANGUS                               Scd        S        Gramf        R3         NTL          R           GW      _LDA      2.000
- -------------------------------------------------------------------------------------------------------------------------------- 
BEACON HILL                         SW         E        WC           R2         NTL          R           PY      _LDN      1.000
- -------------------------------------------------------------------------------------------------------------------------------- 
BELMONT                x            Nth        N        YTV3         R2         NTL          M           LS      SLDA      5.000
- -------------------------------------------------------------------------------------------------------------------------------- 
BILSDALE               x            NE         N        TTT2         R2         CTI          M           NT      SLDN      2.400
- -------------------------------------------------------------------------------------------------------------------------------- 
BLACK HILL             x            Scd        S        Scot1        R3         NTL          M           GW      SHDN     10.000
- -------------------------------------------------------------------------------------------------------------------------------- 
BLAENPLWYF                          Wls        N        HTV C        R1         CTI          R           CF      _LDN      2.000
- -------------------------------------------------------------------------------------------------------------------------------- 
BLUEBELL HILL          X            SE         E        Meri3        R2         CTI          M           TC      SLDN      3.000
- -------------------------------------------------------------------------------------------------------------------------------- 
BRESSAY                             Scd        S        Gram1        R3         CTI          R           GW      _LDA      1.000
- -------------------------------------------------------------------------------------------------------------------------------- 
BRIERLEY HILL                       Mid        M        Cen1         R2         CTI          R           BM      _LSA      0.050
- -------------------------------------------------------------------------------------------------------------------------------- 
BRISTOL IC                          W          E        HTV B        R2         CTI          R           BS      _LSA      0.020
- -------------------------------------------------------------------------------------------------------------------------------- 
BRISTOL KW                          W          E        HTV B        R2         CTI          R           BS      _LDN      0.010
- -------------------------------------------------------------------------------------------------------------------------------- 
BROMSGROVE                          Mid        M        Cen1         R2         CTI          R           BM      LSA       0.025
- -------------------------------------------------------------------------------------------------------------------------------- 
BROUGHER MTN.                       NI         U        UTV1         R2         CTI          R           BE      _LDA      0.500
- -------------------------------------------------------------------------------------------------------------------------------- 
CALDBECK                            NE         S        Bord1        R2         NTL          M           NT      SHDN      5.000
- -------------------------------------------------------------------------------------------------------------------------------- 
CARADON HILL                        SW         E        WC           R2         NTL          M           PY      SHDN      4.000
- -------------------------------------------------------------------------------------------------------------------------------- 
CARMEL                              Wls        E        HTV C        R1         CTI          R           CF      _LDA      2.500
- -------------------------------------------------------------------------------------------------------------------------------- 
CHATTON                             NE         N        TTT1         R2         NTL          R           NT      _LDA      3.000
- -------------------------------------------------------------------------------------------------------------------------------- 
CHESTERFIELD                        Nth        N        YTV2         R2         NTL          R           LS      _LSA      0.020
- -------------------------------------------------------------------------------------------------------------------------------- 
CRAIGKELLY                          Scd        S        Scot1        R3         NTL          M           GW      _LDN      1.000
- -------------------------------------------------------------------------------------------------------------------------------- 
CRYSTAL PALACE         x            SE         L        C/LWT        R2         CTI          M           TC      SHDN     10.000
- -------------------------------------------------------------------------------------------------------------------------------- 
DARVEL                              Scd        S        Scot1        R3         NTL          R           GW      _LDA      2.000
- -------------------------------------------------------------------------------------------------------------------------------- 
DIVIS                  x            NI         U        UTV1         R2         CTI          M           BE      SLDN      2.300
- -------------------------------------------------------------------------------------------------------------------------------- 
DOVER                               SE         E        Meri3        R2         NTL          M           TC      _LDN      1.000
- -------------------------------------------------------------------------------------------------------------------------------- 
DURRIS                              Scd        S        Gram1        R3         NTL          M           GW      SHDA     10.000
- -------------------------------------------------------------------------------------------------------------------------------- 
EITSHAL                             Scd        S        Gram1        R3         CTI          R           GW      _LDA      0.800
- -------------------------------------------------------------------------------------------------------------------------------- 
EMLEY MOOR             x            Nth        N        YTV1         R2         NTL          M           LS      SLDA      5.000
- -------------------------------------------------------------------------------------------------------------------------------- 
FENHAM                              NE         N        TTT1         R2         CTI          R           NT      _LSA      0.020
- -------------------------------------------------------------------------------------------------------------------------------- 
</TABLE> 

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       4
<PAGE>
 
<TABLE> 
<CAPTION> 
- ------------------------------------------------------------------------------------------------------------------------------------
                  OTT Transmission                                            Roll-Out           Priority
- -----------------------------------------------------------------------------------------------------------------------------------
                             Abbreviation    UHF      Coverage      ITC                          Operational  Contractual    BBC
STATION                                    Channel      (000'       Phase                                      Responce     
                                                    proportional)                                              Time         
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                          <C>           <C>      <C>             <C>     <C>          <C>     <C>          <C>            <C> 
FENTON                       FNT           34       203              3      [*]          [*]                                 Mid 
- -----------------------------------------------------------------------------------------------------------------------------------
FREMONT POINT                FRP           38       tbd              1      [*]          [*]                                 SW  
- -----------------------------------------------------------------------------------------------------------------------------------
GUILDFORD                    GI            49       242              2      [*]          [*]       x                         SE  
- -----------------------------------------------------------------------------------------------------------------------------------
HANNINGTON                   HAN           50       628              1      [*]          [*]       x                         Sth 
- -----------------------------------------------------------------------------------------------------------------------------------
HASTINGS                     HS            31       196              3      [*]          [*]                                 Sth 
- -----------------------------------------------------------------------------------------------------------------------------------
HEATHFIELD                   HJV           34       354              2      [*]          [*]       x                         Sth 
- -----------------------------------------------------------------------------------------------------------------------------------
HEMEL HEMPSTEAD              HH            48       161              2      [*]          [*]                                 SE  
- -----------------------------------------------------------------------------------------------------------------------------------
HUNTSHAW CROSS               HC            54       117              3      [*]          [*]                                 SW  
- -----------------------------------------------------------------------------------------------------------------------------------
IDLE                         IDL           45       163              2      [*]          [*]                                 Nth 
- -----------------------------------------------------------------------------------------------------------------------------------
KEELYLANG HILL               KEE           48        15              3      [*]          [*]                                 Scd 
- -----------------------------------------------------------------------------------------------------------------------------------
KEIGHLEY                     KJ            53       131              3      [*]          [*]                                 Nth 
- -----------------------------------------------------------------------------------------------------------------------------------
KILVEY HILL                  KVH           25       245              2      [*]          [*]       x                         Wls 
- -----------------------------------------------------------------------------------------------------------------------------------
KNOCK MORE                   KMR           34        54              3      [*]          [*]                                 Scd 
- -----------------------------------------------------------------------------------------------------------------------------------
LANCASTER                    LCR           28       225              2      [*]          [*]       x                         NW  
- -----------------------------------------------------------------------------------------------------------------------------------
LARK STOKE                   LKK           21       122              3      [*]          [*]                                 Mid 
- -----------------------------------------------------------------------------------------------------------------------------------
LLMAVADY                     LTS           67       146              2      [*]          [*]                                 NI  
- -----------------------------------------------------------------------------------------------------------------------------------
LIANDDONA                    LLA           67       187              2      [*]          [*]                                 Wls 
- -----------------------------------------------------------------------------------------------------------------------------------
MALVERN                      MVR           67       241              3      [*]          [*]       x                         Mid 
- -----------------------------------------------------------------------------------------------------------------------------------
MENDIP                       *MEN*         59     1,360              1      [*]          [*]       x          x              W   
- -----------------------------------------------------------------------------------------------------------------------------------
MIDHURST                     MH            56      1014              2      [*]          [*]       x          x              Sth 
- -----------------------------------------------------------------------------------------------------------------------------------
MOEL-Y-PARC                  MYP           54       531              1      [*]          [*]       x          x              Wls 
- -----------------------------------------------------------------------------------------------------------------------------------
NOTTINGHAM                   NOU           39       311              2      [*]          [*]       x                         EMid
- -----------------------------------------------------------------------------------------------------------------------------------
OLIVERS MOUNT                OMT           49        70              3      [*]          [*]                                 Nth 
- -----------------------------------------------------------------------------------------------------------------------------------
OXFORD                       OF            34       907              1      [*]          [*]       x          x              SE  
- -----------------------------------------------------------------------------------------------------------------------------------
PENDLE FOREST                PLF           21       196              3      [*]          [*]                                 NW  
- ------------------------------------------------------------------------------------------------------------------------------------

PLYMPTON                     PTN           52       149              3      [*]          [*]                                 SW  
- ------------------------------------------------------------------------------------------------------------------------------------

PONTOP PIKE                  *PP*          48     1,309              1      [*]          [*]       x          x              NE  
- ------------------------------------------------------------------------------------------------------------------------------------

PONTYPOOL                    PPL           52        78              3      [*]          [*]                                 Wls 
- ------------------------------------------------------------------------------------------------------------------------------------



<CAPTION> 
- --------------------------------------------------------------------------------------------------------------------
                              Religion                                Site                     Design
- --------------------------------------------------------------------------------------------------------------------
                                        ITV       SDN         Landlord      ITC       BBC    Generic    ERP
STATION                   Channel 4                                     Designation  Studio  Source     (kw)
- ---------------------------------------------------------------------------------------------------------------------
<S>                       <C>           <C>       <C>         <C>       <C>         <C>      <C>      <C> 
FENTON                    M             Cen2       R2         CTI       R            BM      _LSA      0.050
- --------------------------------------------------------------------------------------------------------------------- 
FREMONT POINT             E             ChTv1      R2         NTL       M            PY      SLDA      0.200          
- --------------------------------------------------------------------------------------------------------------------- 
GUILDFORD                 L             C/LWT      R2         CTI       R            TC      _LDN      0.100          
- --------------------------------------------------------------------------------------------------------------------- 
HANNINGTON                E             Meri2      R2         CTI       M            SO      SLDN     10.000          
- --------------------------------------------------------------------------------------------------------------------- 
HASTINGS                  E             Meri4      R2         CTI       R            SO      _LSA      0.100          
- --------------------------------------------------------------------------------------------------------------------- 
HEATHFIELD                E             Meri4      R2         CTI       M            SO      SLDN      1.600          
- --------------------------------------------------------------------------------------------------------------------- 
HEMEL HEMPSTEAD           L             C/LWT      R2         CTI       R            TC      _LDN      0.100          
- --------------------------------------------------------------------------------------------------------------------- 
HUNTSHAW CROSS            E             WC4        R2         NTL       R            PY      _LDA      2.000          
- --------------------------------------------------------------------------------------------------------------------- 
IDLE                      N             York1      R2         NTL       R            LS      _LSA      0.003          
- --------------------------------------------------------------------------------------------------------------------- 
KEELYLANG HILL            S             Gram2      R3         CTI       R            GW      _LDN      1.000          
- --------------------------------------------------------------------------------------------------------------------- 
KEIGHLEY                  N             York1      R2         NTL       R            LS      _LSA      0.050          
- --------------------------------------------------------------------------------------------------------------------- 
KILVEY HILL               E             HTV        R1         CTI       R            CF      _LDN      0.300          
- --------------------------------------------------------------------------------------------------------------------- 
KNOCK MORE                S             Gram2      R3         NTL       R            GW      _LDA      1.000          
- --------------------------------------------------------------------------------------------------------------------- 
LANCASTER                 N             Gran1      R2         NTL       R            MR      _LSA      0.100          
- --------------------------------------------------------------------------------------------------------------------- 
LARK STOKE                M             Cen2       R2         CTI       R            BM      _LSA      0.025          
- --------------------------------------------------------------------------------------------------------------------- 
LLMAVADY                  U             UTV1       R2         CTI       R            BE      _LDA      0.800          
- --------------------------------------------------------------------------------------------------------------------- 
LIANDDONA                 N             HTV        R1         CTI       R            CF      _LDA      1.000          
- --------------------------------------------------------------------------------------------------------------------- 
MALVERN                   M             Cen2       R2         CTI       R            BM      _LSA      0.100          
- --------------------------------------------------------------------------------------------------------------------- 
MENDIP                    E             HTV        R2         CTI       M            BS      SLDN      3.000          
- --------------------------------------------------------------------------------------------------------------------- 
MIDHURST                  E             Meri3      R2         CTI       M            SO      _LDN     10.000          
- --------------------------------------------------------------------------------------------------------------------- 
MOEL-Y-PARC               N             HTV        R1         NTL       M            CF      _LDN      0.500          
- --------------------------------------------------------------------------------------------------------------------- 
NOTTINGHAM                M             Cen4       R2         NTL       R            NO       LSA      0.020          
- --------------------------------------------------------------------------------------------------------------------- 
OLIVERS MOUNT             N             York1      R2         CTI       R            LS      _LSA      0.050          
- --------------------------------------------------------------------------------------------------------------------- 
OXFORD                    M             Cen3       R2         CTI       M            TC      SHDA     10.000          
- --------------------------------------------------------------------------------------------------------------------- 
PENDLE FOREST             N             Gran1      R2         NTL       R            MR      _LSA      0.050          
- --------------------------------------------------------------------------------------------------------------------- 
PLYMPTON                  E             W C3       R2         NTL       R            PY      _LSA      0.100          
- --------------------------------------------------------------------------------------------------------------------- 
PONTOP PIKE               N             TTT1       R2         CTI       M            NT      SHDA     10.000          
- --------------------------------------------------------------------------------------------------------------------- 
PONTYPOOL                 E             HTV        R1         CTI       R            CF      _LDN      0.010          
- --------------------------------------------------------------------------------------------------------------------- 
</TABLE> 

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       5
<PAGE>
 
<TABLE>
<CAPTION>
                DTT TRANSMISSION                                                                         ROLL-OUT
- -----------------------------------------------------------------------------------------------------------------------------
                                                UHF             Coverage                ITC
       STATION           Abbreviation         Channel      (000' proportional)         Phase
- -----------------------------------------------------------------------------------------------------------------------------
<S>                      <C>                  <C>          <C>                         <C>               <C>       <C>
PRESELY                      PRS                47                 97                    2               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
REDRUTH                       RR                39                 240                   3               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
REIGATE                      REI                31                 219                   3               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
RIDGE HILL                   RHA                34                 527                   2               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
ROSEMARKIE                    RK                47                 112                   2               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
ROSNEATH                     ROS                67                 126                   3               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
ROWRIDGE                    *ROW*               67                1,731                  1               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
RUMSTER FOREST               RMF                28                 60                    2               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
SADDLEWORTH                  SWH                47                 366                   2               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
SALISBURY                     SA                55                 47                    3               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
SANDY HEATH                 *SDT*               29                1,745                  1               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
SELKIRK                      SXJ                53                 69                    2               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
SHEFFIELD                     SF                39                 340                   2               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
STOCKLAND HILL               SDL                22                 572                   1               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
STORETON                     SEN                30                 206                   3               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
SUDBURY                      SVY                49                 645                   2               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
SUTTON COLDFIELD             *SC*               41                2,923                  1               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
TACOLNESTON                  TAC                63                 868                   1               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
THE WREKIN(E)                WRK                39                                       3               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
THE WREKIN(W)                WRK                21                 882                   3               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
TOROSAY                      TOY                23                 13                    3               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
TUNBRIDGE WELLS               TW                55                 75                    3               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
WALTHAM                     *WBF*               49                2,098                  1               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
WENVOE                       *WV*               39                 907                  1 T              [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
WHITEHAWK HILL                WL                66                 386                   2               [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
WINTER HILL                 *WRH*               56                5,058                 1 T              [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
WINTER HILL                 *WRH*               67                                      1 T              [*]       [*]
- -----------------------------------------------------------------------------------------------------------------------------
<CAPTION>
               DTT TRANSMISSION                          PRIORITY                                REGION
- -----------------------------------------------------------------------------------------------------------------------------
                                                             Contractual
       STATION           Abbreviation       Operational     Response Time           BBC          Channel 4       ITV    SDN
- -----------------------------------------------------------------------------------------------------------------------------
<S>                      <C>                <C>             <C>                    <C>           <C>            <C>     <C> 
PRESELY                       PRS                                                   Wls            E            HTV C1   R1
- -----------------------------------------------------------------------------------------------------------------------------
REDRUTH                       RR                 x                                  SW             E             W C5    R2
- -----------------------------------------------------------------------------------------------------------------------------
REIGATE                       REI                                                   SE             L            C/LWT    R2
- -----------------------------------------------------------------------------------------------------------------------------   
RIDGE HILL                    RHA                x                                  Mid            M             Cen1    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
ROSEMARKIE                    RK                                                    Scd            S            Gram2    R3     
- -----------------------------------------------------------------------------------------------------------------------------   
ROSNEATH                      ROS                                                   Scd            S            Scot1    R3     
- -----------------------------------------------------------------------------------------------------------------------------   
ROWRIDGE                     *ROW*               x                x                 Sth            E            Meri1    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
RUMSTER FOREST                RMF                                                   Scd            S            Gram2    R3     
- -----------------------------------------------------------------------------------------------------------------------------   
SADDLEWORTH                   SWH                x                                  NW             N            Gran1    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
SALISBURY                     SA                                                    Sth            E            Meri1    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
SANDY HEATH                  *SDT*               x                x                 WA             E             Ang2    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
SELKIRK                       SXJ                                                   Scd            S            Bord2    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
SHEFFIELD                     SF                 x                                  Nth            N            York2    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
STOCKLAND HILL                SDL                x                x                 SW             E             WC1     R2     
- -----------------------------------------------------------------------------------------------------------------------------   
STORETON                      SEN                                                   NW             N            Gran1    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
SUDBURY                       SVY                x                x                  E             E             Ang1    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
SUTTON COLDFIELD             *SC*                x                x                 Mid            M             Cen2    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
TACOLNESTON                   TAC                x                x                  E             E             Ang3    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
THE WREKIN(E)                 WRK                x                x                 Mid            M             Cen2    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
THE WREKIN(W)                 WRK                x                x                 Mid            M             Cen2    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
TOROSAY                       TOY                                                   Scd            S            Scot1    R3     
- -----------------------------------------------------------------------------------------------------------------------------   
TUNBRIDGE WELLS               TW                                                    SE             E            Meri4    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
WALTHAM                      *WBF*               x                x                Emid            M             Cen4    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
WENVOE                       *WV*                x                x                 Wls            E            HTVC1    R1     
- -----------------------------------------------------------------------------------------------------------------------------   
WHITEHAWK HILL                WL                 x                                  Sth            E            Meri3    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
WINTER HILL                  *WRH*               x                x                 NW             N            Gran1    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
WINTER HILL                  *WRH*               x                x                 NW             N            Gran1    R2     
- -----------------------------------------------------------------------------------------------------------------------------   
<CAPTION>
                  DTT TRANSMISSION                             SITE                               DESIGN
- ----------------------------------------------------------------------------------------------------------------------- 
                                                                    ITC              BBC                       ERP
       STATION            Abbreviation             Landlord     Designation     Studio Source      Generic     (kw)
- ----------------------------------------------------------------------------------------------------------------------- 
<S>                       <C>                      <C>          <C>             <C>                <C>        <C>  
PRESELY                      PRS                      NTL            R               CF              LDA       0.500           
- -----------------------------------------------------------------------------------------------------------------------        
REDRUTH                      RR                       CTI            R               PY              LDA       1.600           
- -----------------------------------------------------------------------------------------------------------------------        
REIGATE                      REI                      CTI            R               TC              LDN       0.100           
- -----------------------------------------------------------------------------------------------------------------------        
RIDGE HILL                   RHA                      NTL            M               BM             SHDN       5.000           
- -----------------------------------------------------------------------------------------------------------------------        
ROSEMARKIE                   RK                       CTI            R               GW              HDA      10.000           
- -----------------------------------------------------------------------------------------------------------------------        
ROSNEATH                     ROS                      NTL            R               GW              LSA       0.100           
- -----------------------------------------------------------------------------------------------------------------------        
ROWRIDGE                     *ROW*                    CTI            M               SO             SLDN      10.000           
- -----------------------------------------------------------------------------------------------------------------------        
RUMSTER FOREST               RMF                      NTL            R               GW              LDA       1.000           
- -----------------------------------------------------------------------------------------------------------------------        
SADDLEWORTH                  SWH                      NTL            R               MR              LSA       0.020           
- -----------------------------------------------------------------------------------------------------------------------        
SALISBURY                    SA                       CTI            R               SO              LSA       0.500           
- -----------------------------------------------------------------------------------------------------------------------        
SANDY HEATH                  *SDT*                    NTL            M               CB             SHDN      10.000           
- -----------------------------------------------------------------------------------------------------------------------        
SELKIRK                      SXJ                      NTL            M               GW             SLDA       3.000           
- -----------------------------------------------------------------------------------------------------------------------        
SHEFFIELD                    SF                       CTI            R               LS             SLDN       0.050           
- -----------------------------------------------------------------------------------------------------------------------        
STOCKLAND HILL               SDL                      NTL            M               PY              HDN       2.500           
- -----------------------------------------------------------------------------------------------------------------------        
STORETON                     SEN                      CTI            R               MR              LDN       0.028           
- -----------------------------------------------------------------------------------------------------------------------        
SUDBURY                      SVY                      CTI            M               NC              LDN       7.000           
- -----------------------------------------------------------------------------------------------------------------------        
SUTTON COLDFIELD             *SC*                     CTI            M               BM             SLDN       4.000           
- -----------------------------------------------------------------------------------------------------------------------        
TACOLNESTON                  TAC                      CTI            M               NC             SLDN      10.000           
- -----------------------------------------------------------------------------------------------------------------------        
THE WREKIN(E)                WRK                      CTI            R               BM              LDN       1.000           
- -----------------------------------------------------------------------------------------------------------------------        
THE WREKIN(W)                WRK                      CTI            R               BM              LDN       1.000           
- -----------------------------------------------------------------------------------------------------------------------        
TOROSAY                      TOY                      CTI            R               GW              LDA       0.125           
- -----------------------------------------------------------------------------------------------------------------------        
TUNBRIDGE WELLS              TW                       CTI            R               TC              LDA       0.100           
- -----------------------------------------------------------------------------------------------------------------------        
WALTHAM                      *WBF*                    CTI            M               NO             SHDN       5.000           
- -----------------------------------------------------------------------------------------------------------------------        
WENVOE                       *WV*                     CTI            M               CF             SHDN      10.000           
- -----------------------------------------------------------------------------------------------------------------------        
WHITEHAWK HILL               WL                       CTI            R               SO              LSA       0.100           
- -----------------------------------------------------------------------------------------------------------------------        
WINTER HILL                  *WRH*                    NTL            M               MR             SHDN       5.000           
- -----------------------------------------------------------------------------------------------------------------------        
WINTER HILL                  *WRH*                    NTL            M               MR             SLDN       0.100           
- -----------------------------------------------------------------------------------------------------------------------        
</TABLE>

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       6
<PAGE>
 
                                  SCHEDULE 2

                                    CHARGES

1.   INTRODUCTION

1.1  This Schedule details the charges payable under this Agreement and the
     mechanism for establishing all future charges that may become payable as
     agreed between both parties. It also sets out the charges for liquidated
     damages and service termination.

1.2  No change shall be made to any charges under this Agreement without prior
     written agreement between the parties, as appropriate.

2.   PRINCIPLES

2.1  Charges shall become due from the BBC from the First Payment Date specified
     in Clause 2.3.4, after which a monthly payment will be made in arrears to
     CTI, which will be one twelfth of the annual charge agreed.

2.2  The annual charge may be varied on each anniversary of the First Payment
     Date for the purpose of inflationary adjustment.  Adjustments will be
     calculated by applying the Retail Price Index (RPI) [*].

2.3  Changes to the Agreement that involve a change to the annual charge other
     than by application of RPI, shall be calculated and executed in accordance
     with the Change Control Procedure (Schedule 3).

2.4  Service Credits that may accrue to the BBC will be deducted from subsequent
     payments due to CTI, as appropriate, and established in accordance with the
     procedures prescribed in Schedule 8.

2.5  Liquidated damages that may become payable to the BBC will be deducted from
     the monthly payments due to CTI.

3.   CHARGES

3.1  The BBC shall pay CTI monthly in arrears one twelfth of the agreed annual
     charge, following receipt each month of a valid invoice.

3.2  The agreed annual charge for Phase 1 (excluding VAT) shall be:[*]
 
3.3  If the BBC commits to Phase 2 before the date set out in Clause 2.4.1, the
     agreed annual charge for Phase 2 (excluding VAT) shall be:[*]

3.4  If the BBC commits to Phase 3 before the date set out in Clause 2.4.1, the
     agreed annual charge for Phase 3 (excluding VAT) shall be:[*]

     For the avoidance of doubt, the first payment date for Phase 3 shall be the
     first day of the month following the date that the BBC commits to Phase 3.

3.5  In addition to the annual charge, the BBC shall pay the actual cost of the
     WT Act Licence fee for the transmission of the BBC multiplex from the
     Stations. This fee will be paid to CTI by the BBC on receipt of a valid
     invoice from CTI, supported by a copy of the invoice from the
     Radiocommunications Agency.

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       1
<PAGE>
 
4.    CHANGES TO CHARGES

4.1   GENERAL

4.1.1     Changes to the annual charge shall be made in accordance with the
          following procedures.

4.2   CHANGE DUE TO INFLATION

4.2.1     On the First Payment Date, and each anniversary of the Payment Date
          thereafter, the annual Charge shall be uplifted by the Retail Price
          Index [*]. The uplift will be agreed two months prior to the date on
          which the increase is due to take effect, and RPI will be taken from
          the most recently published index issued by the Central Statistical
          Office. Where such index is no longer published, any other index
          replacing RPI shall be used, subject to the agreement of both parties.

4.3   CHANGE UNDER CHANGE CONTROL

4.3.1     Where a change executed in accordance with the provisions of Schedule
          3 results in a change (up or down) to the annual charges, the
          following shall apply in calculating subsequent adjustments due to
          RPI:

      a)  where change brings an increase to the annual charge and the increase
          takes effect after 3 months from the last RPI adjustment, the increase
          will not be taken into account when calculating the next RPI
          adjustment;

      b)  where change brings a decrease to the annual charge and the decrease
          takes effect after 6 months from the last RPI adjustment, the decrease
          will not be taken into account when calculating the next RPI
          adjustment.

4.3.2     Both parties will agree in good faith the point when it is appropriate
          to adjust the annual service charge
 
4.4   RIGHT TO AUDIT

4.4.1     The BBC shall retain the right to audit all information provided by
          CTI under the "open book" approach, as defined in Schedule 3.

5.    LIQUIDATED DAMAGES

5.1   PRINCIPLES

5.1.1     Liquidated damages shall be
5.1.2     Liquidated Damages will be payable as set out in Schedule 1. In the
          case of Phase I this will relate to delays from the Phase 1 in the
          event of delays from the Launch Date and for Phases 2 and 3 from the
          Phase 2 Service Date and Phase 3 Service agreed industry roll-out Date
          (as appropriate) shown in Schedule 1. Liquidated Damages will be
          deducted from the Charges in the payment following their occurrence.
           
5.1.3     The following Liquidated Damage charges will apply:

               Station                                           CHARGE PER DAY
               Black Hill                                               [*]   
               Crystal Palace                                           [*]   
               Divis                                                    [*]   
               Wenvoe                                                   [*]   
               Phase 1 Stations identified as "must have for launch"    [*]   
               Other Phase 1 Stations                                   [*]   
               All Phase 2 and Phase 3 Stations                         [*]   

      subject to a maximum aggregate charge of [*] per day.
 
5.2   METHOD OF CALCULATING DAMAGES FOR PHASE 1
5.2.1     For those Phase 1 Stations which the parties have agreed and indicated
          in Schedule 1, Table 1 that the BBC "must have at launch", any delay
          in the issuance of an Acceptance Certificate in accordance with Clause
          2.7.5 by the BBC before the Phase 1 Launch Date will be deemed to
          prevent the launch of all Phase 1 Stations and CM shall pay to the BBC
          liquidated damages for those Stations as set out above.
           
[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       2
<PAGE>
 
5.2.2     For those Phase 1 Stations which the parties have not agreed nor
          indicated in Schedule 1 Table 1 that the BBC "Must have at launch",
          any delay in the issuance of an Acceptance Certificate by the BBC
          before the Phase 1 Launch Date will be deemed to prevent the launch of
          that Station only, and CTI shall pay to the BBC Liquidated Damages at
          the rates set out against each Station as set out above for each day
          that the Launch Date for that Station is delayed.

5.3    METHOD OF CALCULATING DAMAGES FOR PHASES 2 AND 3

5.3.1     For those Stations included in Schedule 1 Table 1 for Phases 2 and 3,
          any delay in the issuance of an Acceptance Certificate in accordance
          with Clause 2.7.5 by the BBC, shall initiate the payment of Liquidated
          Damages by CTI for that Station, as set out above.
           
6.     TERMINATION

6.1    If the BBC chooses to terminate this Agreement at the agreed review point
       given in clause 12.2.1, the BBC will be liable to pay CTI on termination
       a charge which will be:

Where the BBC has committed to Phase 1 only:                [*]

Where the BBC has committed to Phases 1 and 2:              [*]

Where the BBC has committed to Phases 1, 2 and 3:           [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       3
<PAGE>
 
                                  SCHEDULE 3

                            PART I: CHANGE CONTROL

1.   INTRODUCTION

1.1  This Schedule defines the Change Control Procedure by which the parties
     will deal with all proposed changes to this Agreement. CTI and the BBC will
     discuss any proposed change, and the consequences, in good faith and within
     agreed timescales. Either party may raise with the other a requirement for
     a change to the Agreement, but only changes agreed with CTI and authorised
     in writing by the BBC may be executed.

2.   PRINCIPLES

2.1  Changes which are reasonably needed for CTI to comply with its fundamental
     obligations under this Agreement shall be undertaken by CTI within an
     agreed timescale and at its cost, unless CTI can adequately demonstrate,
     and the BBC agrees (such agreement not to be unreasonably withheld) that it
     would be unreasonable for CTI to bear the full cost of the necessary
     change.

2.2  The primary approach to change is two-fold:

     i)   major change involving additional services will be managed within the
          Chance Control Procedure and the Charges varied accordingly

     ii)  technological changes with the purpose of maintaining, enhancing or
          improving either the quality and efficiency or overall value for money
          of the Services will be managed under the Change Control Procedure.
          The onus will be on CTI to demonstrate innovative ways of financing
          such changes within the agreed Charges and to manage the consequences
          and risk of implementing such changes.

2.3  In principle, the primary areas of this Agreement and the Services that
     will be subject to change control are as follows:

     i)   requirements for additional Stations

     ii)  technology refresh designed to improve the quality, efficiency and
          value for money of the Services

     iii) technology refresh which provides additional functionality not yet
          available, such as particular technical monitoring capabilities

     iv)  enhancements or additions to the Services that represent additional
          features or service functionality

2.4  Changes that involve a variation (up or down) to the Charges will be
     established either:

     i)   by reference to fixed charges already agreed, if any, between both
          parties, such as a fixed charge for additional Stations or
          transmitters

     ii)  by use of an "open book" policy, where CTI will provide a reasonably
          detailed breakdown (in any format requested by the BBC) of the cost of
          any proposed change, which demonstrates that such costs have been
          minimised and that the change represents best value for money.

2.5  Any report requested from CTI by the BBC under paragraph 4.2 below which
     details the impact and costs of any change shall include, as a minimum, the
     following:

     i)   effects on performance

     ii)  any consequential effects of the change

     iii) potential for disruptions

     iv)  any appropriate contingency plans

                                       1
<PAGE>
 
3.   CHANGES PROPOSED BY CTI

3.1  If CTI proposes any changes to this Agreement, then CTI must submit to the
     BBC a document describing the suggested changes, and detailing:

     i)   any impact the change would have on the timing for provision of any
          Services under this Agreement.

     ii)  any impact the change would have on the Charges payable under this
          Agreement.

     iii) a description of the benefits that the change would make to the
          provision of the Services.

     iv)  any other changes that would be required to any aspect of this
          Agreement if the change were implemented.

     v)   any other matter or thing of which CTI is aware that would be relevant
          to deciding whether or not to implement the change.

3.2  Within 10 Business Days of receipt by the BBC of the document referred to
     in paragraph 3.1, the parties must commence discussions in good faith on
     the proposed change with a view to agreeing whether to amend this
     Agreement.

4    CHANGES PROPOSED BY THE BBC

4.1  The BBC may at any time propose changes to this Agreement.  The BBC may
     require CTI to make any changes arising from a change to the BBC's Charter
     or DNH Agreement.

4.2  Within 20 Business Days of receipt of a notice from the BBC or other period
     as agreed between the parties proposing or requiring a change, CTI must
     submit to the BBC a document detailing the matters set out in paragraphs
     3.1(i) to 3.1(v).

4.3  Within 10 Business Days of receipt by the BBC of the document referred to
     in paragraph 4.2, the parties must discuss in good faith the proposed or
     required change with a view to agreeing whether to amend this Agreement.

                  PART II: MANAGEMENT OF FORESEEABLE CHANGES
<TABLE>
<CAPTION> 
- -------------------------------------------------------------------------------------
                Change   
Change Area      Ref.        Specific Change         Details of Exposure         [*]
- -------------------------------------------------------------------------------------
<S>             <C>        <C>                     <C>                           <C>   
DISTRIBUTION     1A        SI insertion            [*]                           [*]
SYSTEM                     required other than
                           as defined in
                           Schedule 1I
- -------------------------------------------------------------------------------------
                 1B        Modifications to        Delays and/or technology      [*]
                           distribution network    problems. Management
                           provided by BT          and performance of BT will
                                                   be exclusively CTI's
                                                   responsibility.
- -------------------------------------------------------------------------------------
                 1C        Change of BBC           Ramifications of regional     [*]
                           Editorial Regional      boundary changes on
                           Boundaries              proposed distribution
                                                   network and SI collation.
                                                   CTI to make reasonable
                                                   endeavours in network
                                                   planning to minimise
                                                   additional costs.  This is
                                                   subject to BBC submitting
                                                   details of possible regional
                                                   changes PRIOR to network
                                                   design being finalised by 
                                                   CTI.
- -------------------------------------------------------------------------------------
TRANSMISSION     2A        Frequency Co-           Changes to network            [*]
SYSTEM                     ordination and          and/or transmission
                           Planning                systems made
- -------------------------------------------------------------------------------------
</TABLE> 

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       2
<PAGE>
 
<TABLE>
<CAPTION>  
- -------------------------------------------------------------------------------------
                Change   
Change Area      Ref.    Specific Change          Details of Exposure            [*]
- -------------------------------------------------------------------------------------
<S>             <C>     <C>                    <C>                               <C>   
                                               necessary by the process
                                               of agreeing the frequency
                                               plan other than where a
                                               change of site is required.
- -------------------------------------------------------------------------------------
                                               Changes to network                [*]
                                               and/or transmission
                                               systems made necessary
                                               by the process of agreeing
                                               the frequency plan where
                                               a change of site is
                                               required.
- -------------------------------------------------------------------------------------
                2B      Cross-Carriage of      Risk of co-ordination with        [*]
                        SI                     other multiplex
                                               transmission service
                                               providers.
- -------------------------------------------------------------------------------------
                2C      Fundamental            Changes to SI                     [*]
                        Changes to SI          implementation from the
                        Collation Strategy     system specified in CTI's
                        including Non-         Proposal but in
                        distributed            accordance with the D-
                        collation              Mux Group agreement.
                        and/or Non-DVB
                        compliant SI
                                               --------------------------------------
                                               Changes required by the
                                               BBC other than in
                                               accordance with the D-
                                               Mux Group agreement.
- -------------------------------------------------------------------------------------
                2D      Changes to             Risk of additional changes        [*]
                        Analogue Network       to the analogue network
                                               over and above those
                                               required in Schedule 4:
                                               Analogue Changes.  CTI
                                               will absorb any minor
                                               costs where significant
                                               capital outlay is not
                                               required.
- -------------------------------------------------------------------------------------
                2E      Frequency Offset       Risk of changes                   [*]
                                               associated with adoption
                                               or removal of frequency
                                               offsets.
- -------------------------------------------------------------------------------------
                2F      Re-radiation of        Radiation of unwanted             [*]
                        Digital                signals caused by re-
                        transmissions by       radiation of adjacent
                        Analogue Relays        channel digital
                                               transmissions by analogue
                                               transposers.
 
                                               CTI will modify up to 20
                                               transposers where an
                                               interference problem is
                                               identified for [*] per
                                               transposer per annum.
                                               Beyond this number of
                                               transposers, the Change
                                               Control Procedure will
                                               determine the price.
- -------------------------------------------------------------------------------------
                2G      DTG D-Book             Post-contract changes to          [*]
                        Changes                the D-Book which the BBC
                                               requires CTI to implement.
- ---------------------------------------------------------------------------------
</TABLE>

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       3
<PAGE>
 
                                  SCHEDULE 4

                        CHANGES TO THE ANALOGUE NETWORK

1.   TYPES OF CHANGE

1.1  The existing analogue television transmission network will need to be
     modified to permit the introduction of DTT. For any analogue station, these
     changes may include, but are not limited to:

     i)    modification of the VSB response to permit adjacent channel DTT
           operation

     ii)   modification of the maximum ERP

     iii)  modification of the antenna parameters

     iv)   addition of a precision offset

     v)    frequency changes

     vi)   introduction of additional analogue transmissions

1.2  Other changes to the network may include:

     i)    construction and operation of new analogue transmitter sites

     ii)   modifications to ancillary services equipment

1.3  The required changes to the analogue network shall be derived from the
     information contained in Schedule 12 Appendix 4, and References 15, 16, 29
     and 32 in Schedule 13. The changes proposed by CTI are summarised in Tables
     1 and 2 below for information purposes only.

           Table 1: Analogue modifications at non-DTT stations as a result of 
                  Multiplex 1 (for information purposes only)

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------
                                              Trpsr        New   RBL   New
Analogue                       DTT            Chan   ERP  Relay  Ant   Tx 
Station           Landlord  Interferer  P.O.  Chnge  Inc   Stn   Mods  Ant 
- --------------------------------------------------------------------------
<S>               <C>       <C>         <C>   <C>    <C>  <C>    <C>   <C>
Arfon             NTL       PRS                             x
Ardnadam          CTI       BKH                       x                 x
Bargoed           CTI       WV           x                        
Barrow Town       CTI       LCR                                   x
Bath              CTI       BSK                x
Bronnant SH       CTI*      BY                              x
Carhampton        CTI       WV           x     x                        x
Cefn-Mawr         NTL       SC           x                  x
Chagford          CTI       CRL                                   x
Croeserw          NTL       HC           x
Cwmbran           NTL*      SDL                             x
Easter Compton    NTL       WV           x     x
Gilfach           CTI       WV           x
Glyncorrwg        NTL       HC                                    x
Greenhill         CTI       WV           x
- --------------------------------------------------------------------------
High Keil         CTI       DIV                                   x
Ilfracombe        NTL       HC           x
Kewstoke          NTL       WV           x     x      x
Long Mountain     CTI       SC           x
Lydden            NTL       DOV                x
Pitlochry         CTI       SXJ                                   x
Ramsbottom        NTL       WRH                       x
Redcliff Bay      NTL       WV           x     x      x
Roadwater         CTI       WV           x
Woodcombe         CTI       WV           x     x      x                 x
- --------------------------------------------------------------------------
</TABLE>

   * Subject to confirmation

                                       1
<PAGE>
 
     Table 2: Analogue modifications at DTT stations as a result of Multiplex 1

                        (for information purposes only)

<TABLE>
<CAPTION>
     -------------------------------------------------------
                                 Modify  
                         Modify  Group   Precision  Replace
     Analogue Station     VSB    Delay    Offset     Drive  
     -------------------------------------------------------
     <S>                 <C>     <C>     <C>        <C>
     Aberdare                      x                    
     Beacon Hill            x      x                    
     Bilsdale               x      x                    
     Black Hill                    x                    
     Blaenplwyf                    x                    
     Bressay                x      x                    
     Bristol I.C.           x      x                    
     Carmel                                  x          
     Chatton                       x                    
     Chesterfield                  x                    
     Crystal Palace         x      x                    
     Darvel                 x      x                    
     Eitshal                       x                    
     Emley Moor                    x                    
     Fenham                 x      x                    
     Fenton                 x      x                    
     Guildford              x      x                    
     Hastings               x      x                    
     Hemel Hempstead               x                    
     Huntshaw Cross         x      x                    
     Keighley               x      x                    
     Kilvey Hill            x      x                    
     Knock More                    x                    
     Lancaster                     x                    
     Malvern                x      x                    
     Mendip                        x         x             
     Midhurst                      x                       
     Oxford                                  x             
     Pendle Forest          x      x                       
     Pontop Pike                             x             
     Pontypool                               x             
     Presely                       x         x             
     Ridge Hill             x      x                       
     Rumster Forest                x                       
     Sandy Heath                             x             
     Selkirk                       x                       
     Stockland Hill         x      x                       
     Sutton Coldfield              x         x             
     Tacolneston                   x                       
     Torosay                       x                       
     Waltham                                 x              
     Winter Hill                   x                     
     -------------------------------------------------------
</TABLE>

2    REQUIREMENT

2.1  CTI shall design and carry out, or procure, the changes to:
 
     a)   that part of the existing analogue network used for BBC services
          necessitated by the introduction of the BBC's digital multiplex

     b)   that part of the existing analogue network used for third party
          services necessitated by the introduction of the BBC's digital
          multiplex

     c)   that part of the existing analogue network used for BBC services
          necessitated by the introduction of third party digital multiplexes

                                       2
<PAGE>
 
2.2  The changes shall be made in accordance with the methodology outlined in 3
     below, unless otherwise agreed between the parties.

2.3  For the avoidance of doubt the changes outlined in (a) and (b) above shall
     be carried out with the BBC's consent and charged in accordance with this
     Agreement. The changes outlined in (c) above shall be carried out under the
     Analogue Contract at the relevant third party multiplex operator's cost.
     Any charge made shall include a one-off payment for the ongoing operation
     and maintenance of any new equipment supplied under the requirements of 2.1
     above.

2.4  Without prejudice to Clause 2.6.3, CTI shall comply with whatever changes
     are required by the Radiocommunications Agency and the Department of
     Culture, Media & Sport when national approval is granted.

2.5  In addition, CTI shall work with and comply with the timetable of the
     organisation charged by the multiplex operators for ensuring that
     interference to domestic reception of analogue TV is rectified. The
     approach adopted will fall within the ITC regulation described in Reference
     14.

3    [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       3
<PAGE>
 
     [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       4
<PAGE>
 
                                  SCHEDULE 7

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       5
<PAGE>

                                  SCHEDULE 8
 
     [*]

     [*] indicates where text has been omitted pursuant to a request for
         confidential treatment. The omitted text has been filed with the
         Securities and Exchange Commission separately.

                                       6
<PAGE>
 
     [*]

     [*] indicates where text has been omitted pursuant to a request for
         confidential treatment. The omitted text has been filed with the
         Securities and Exchange Commission separately.

                                       7
<PAGE>
 
                                  SCHEDULE 5
                           TRANSMISSION REQUIREMENTS

1    GENERAL

1.1  The DTT Transmission Service shall comply with all applicable laws,
     regulations, industry standards and codes of practice. CTI shall be liable
     for the cost implications of complying with any changes arising from
     amendments to existing, or new, laws, regulations etc.

2    BBC INTERNAL DTT ARCHITECTURE

2.1  Introduction

2.1.1     The BBC will distribute programmes to a number of its studio centres
          around the UK, and will install and operate equipment at those centres
          to assemble the national-regional and English-regional DTT
          multiplexes. The centres involved are set out in Schedule 7. The BBC
          reserves the right to vary the number and location of such studio
          centres from time to time, and CTI shall provide sufficient
          flexibility in its network design to accommodate such changes with
          minimal dislocation and associated additional costs.

2.2  National Regions

2.2.1     Coding and multiplexing equipment will be installed by the BBC in the
          national-regional studio centres at Glasgow, Belfast, and Cardiff.
          Such equipment will also be installed by the BBC at the English
          regional studio centre in TV Centre, London. The programme services
          with the addition of SI describing the BBC multiplex services will be
          re-multiplexed into DTT format. CTI shall send the resulting signal
          from the national-regional studio centres to the relevant Stations
          where it shall be re-multiplexed by CTI to insert the SI of the other
          multiplex operators which is to be cross-carried within the BBC
          multiplex, and modulated using the DVB-Terrestrial Specification
          (Reference 6).

2.3  English Regions

2.3.1     The BBC will also install coding and multiplexing equipment at 11
          English-regional studio centres (including London) to allow local opt-
          outs to be generated. This will allow the BBC to meet the requirements
          of the Broadcasting Act to simulcast analogue services on DTT. The
          programme services including the SI of the BBC English-regional
          multiplexes will then be multiplexed into DTT format. The English-
          regional studio centres will act in a similar way to the national-
          regional studio centres.

2.3.2     CTI shall send the resulting signal from the English-regional studio
          centres to the relevant Stations where it shall be re-multiplexed by
          CTI to insert the SI of the other multiplex operators which is to be
          cross-carried within the BBC multiplex, and modulated as set out in
          Reference 6.

2.3.3     The stations for both the national and English-regional variants of
          the BBC multiplex are shown in Schedule 1

3    OVERVIEW OF DTT TRANSMISSION SERVICE

3.1  The DTT Transmission Service shall be provided using a network of
     terrestrial stations installed, maintained and operated by CTI. The BBC
     will not contribute directly to the capital cost of this network or the
     cost of maintaining the network.

3.2  The DTT Transmission Service is made up of the following elements:

     . The design, configuration, supply, installation, maintenance and
       operation of all digital transmission equipment and associated equipment
       at Stations (see Section 4, below).

     . The design, supply, installation, maintenance and operation of the links
       to enable distribution of the BBC multiplexed signal from the BBC's
       national-regional and English-regional studio centres to Stations (see
       Section 5, below).

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       1
<PAGE>
 
     .  The supply, installation, maintenance and operation of MPEG-2
        multiplexing equipment, to enable configuration of the BBC multiplex at
        key Stations (see Section 6, below).

     .  Modification, as appropriate, to the transmission characteristics of the
        existing analogue transmitters to permit the introduction of the digital
        television multiplex and the simultaneous transmission of analogue
        services. Changes to the analogue transmission network shall be
        undertaken in conjunction with the operator of the analogue services, as
        set out in Schedule 4.

     .  Liaison and co-ordination with other multiplex and transmitter network
        operators, and receiver manufacturers, to ensure that the BBC's signals
        can be satisfactorily received and displayed. In particular, this will
        require working with other multiplex operators to ensure that SI, EPG
        and CA data that the BBC may wish to broadcast are correctly inserted
        into the multiplex. CTI shall ensure that the equipment employed has the
        flexibility to support such SI, EPG and CA requirements (which may be
        added at a later date). To facilitate this, the BBC will endeavor to
        reach agreement with other multiplex operators and licensing authorities
        about the format and technical requirements of SI, EPG and CA.

3.3  CTI shall assume end-to-end responsibility for the provision of the service
     from BBC national-regional and English-regional studio centre interface to
     transmission from Stations, and shall ensure that the design,
     implementation and operation of each service component is consistent with
     the overall design. Although CTI's responsibilities do not extend to the
     receipt of signals at receivers, CTI shall assist the BBC in resolving
     viewers problems on a reasonable endeavours basis.

3.4  The arrangements for rectification of any interference caused by the BBC
     DTT multiplex to analogue domestic reception comprises two parts; changes
     at Stations (covered in Schedule 4), and changes at domestic receiving
     locations. The latter will form part of a separate contract and is not
     covered in this Agreement. However, CTI shall provide Station changes in 
     co-ordination with the agreed industry timetable for changes to domestic
     receivers set out in that separate contract.

4.   TRANSMISSION

4.1  CTI shall design, supply, install and operate facilities to radiate the
     BBC's multiplex in accordance with:

     .  the CTI Technical Specification for each Station as listed in Schedule
        12.

     .  the subset of transmission characteristics defined in Reference 6 as 2k
        system, 1/32 guard interval, 64 QAM model, with FEC-2/3 and Reed Solomon
        defined by RS (204, 188, t=8).

     .  ITC UK DTT Frequency Plan (Reference 1)

     .  DTG Interoperability requirements (Reference 7)

4.2  CTI shall use all reasonable endeavours to minimise the impact of changes
     in the transmission characteristics as a result of international co-
     ordination.

4.3  CTI shall take responsibility for obtaining such access to sites and/or
     masts owned by other parties as it requires in order to provide the
     Services.

4.4  The main feed at each Station shall contain the correct BBC Regional
     Programming. In relation to national regional programming, reserve feeds
     for the Stations must also contain the correct national-regional variant of
     the BBC multiplex. In relation to English-regional programming, at
     Operational Priority Stations (as shown in Schedule 1) the reserve feed
     must carry the correct English regional variant. At non-priority Stations
     CTI may use an incorrect English-regional variant for reserve purposes only
     where this gives a substantial and identificable technical or economic
     benefit to the BBC. Such use of an incorrect English-regional variant as a
     reserve feed will require prior agreement with the BBC.

5.   DISTRIBUTION LINKS FROM THE BBC'S STUDIO CENTRES

5.1  CTI shall design, supply, install and operate or procure distribution links
     from the agreed BBC-CTI interface at the BBC's studio centres to the Phase
     1 Stations covered in Schedule 1 and, if relevant, the subsequent Stations.
     Access to BBC studio centres for this purpose will be pursuant to the site
     sharing agreement shown in Schedule 10.

5.2  The key points of the overall architecture for BBC's DTT service are:


[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       2
<PAGE>
 
     .  Each DTT national-regional multiplex will be available at a network
        termination point at the appropriate studio centre in the national
        region. That is, BBC Scotland at Broadcasting House, Glasgow, BBC
        Northern Ireland at Broadcasting House, Belfast and BBC Wales at
        Broadcasting House, Cardiff.

     .  The English-regional multiplexes for the English regions will be
        available at the relevant BBC studio centre.

5.3  At Operational Priority Stations a single point of failure between the main
     and reserve feeds should be avoided as far as is reasonably practicable.
     For reasons of Rights protection, CTI shall ensure that any terrestrial or
     satellite circuits used only for the primary distribution of services
     cannot be used to feed domestic installations outside the UK or to feed
     national-regional variants outside the relevant national-region. However,
     if a closed, low-power or proprietary system is used, the services may not
     need to be scrambled; any use of such an approach by CTI will require the
     prior agreement of the BBC.

6    MULTIPLEXING REQUIREMENTS

6.1  General

6.1.1     Subject to Sections 6.1 and 6.2 below, CTI shall design, procure,
          supply, install and operate suitable equipment to multiplex additional
          data into the MPEG data stream for radiation at each Station for 
          cross-carriage of DVB SI.

6.1.2     No other recoding or remultiplexing of the DTT MPEG transport stream
          provided by the BBC shall be performed by CTI, without the prior
          written approval of the BBC.

6.2  Service Information (SI)

6.2.1     The SI referring to the BBC multiplex and inserted in the BBC
          multiplex shall remain correct in the event of a reserve feed for the
          BBC multiplex being selected. It is desirable that the SI referring to
          the BBC multiplex and offered to other multiplex operators also
          remains correct in the event of a reserve feed for the BBC multiplex
          being selected. Similarly, it is desirable that the SI referring to
          other multiplexes and inserted in the BBC multiplex accurately
          reflects the actual status of the services radiated on the other
          multiplexes. CTI shall comply with the SI insertion points identified
          in Schedule 1.

6.2.2     Should central collation of SI be chosen by the D-Mux group, and
          agreed by the BBC, remultiplexing equipment will be retained at the
          Station where SI is required to be inserted. The specification for
          this remultiplexing equipment, and the format in which the SI (or data
          from which SI is derived) is provided, will be dependent on the
          central collator system that is chosen.

6.3  Electronic Programme Guide (EPG) and Conditional Access (CA) data

6.3.1     The BBC will endeavour to reach agreement with any of the other
          multiplex operators which intend to carry an EPG and CA as part of
          their terrestrial multiplex. Although the insertion, carriage and
          cross carriage of EPG and CA data is outside the scope of this
          agreement, CTI shall assist in this process by providing the ability
          for appropriate data insertion and extraction to be carried out by the
          BBC or its agents, including a reasonable right of access to CTI
          buildings and/or items of infrastructure. In addition, CTI shall
          provide a design sufficiently flexible to accommodate the above
          requirements with minimal disruption and associated additional costs.

7    INDUSTRY LIAISON

7.1  CTI shall participate in relevant industry organisations and act on the
     BBC's behalf to ensure a co-ordinated approach to the introduction of DTT,
     and that the maximum compatibility is achieved between the signals radiated
     on each multiplex.

7.2  In particular CTI shall liaise with other multiplex service providers,
     operators and receiver manufacturers to assist the BBC in ensuring that the
     SI, EPG and CA information can be cross-carried and that the BBC's DTT
     services remain accessible by all DVB-T compliant receivers.

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       3
<PAGE>
 
                                  SCHEDULE 6

[*]  

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.
     

                                       1
<PAGE>

[*]
 
[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       2
<PAGE>
 
[*]

      [*]  indicates where text has been omitted pursuant to a request for
           confidential treatment. The omitted text has been filed with the
           Securities and Exchange Commission separately.

                                       3
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.


                                       4
<PAGE>
 
[*]

[*]   indicates where text has been omitted pursuant to a request for
      confidential treatment. The omitted text has been filed with the
      Securities and Exchange Commission separately.

                                       5
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       6
<PAGE>
 
[*]

[*]   indicates where text has been omitted pursuant to a request for 
      confidential treatment. The omitted text has been filed with the
      Securities and Exchange Commission separately.

                                       7
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       8
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       9
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      10
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      11
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      12
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission seperately

                                      13
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      14
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      15
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      16
<PAGE>
 
                                  SCHEDULE 7

                            INTERFACE SPECIFICATION

1    SIGNAL FORMATS

1.1  The signals at the network termination point at the Studio Centres in the
     BBC will comprise multi-programme MPEG transport streams coded and
     formatted in accordance with the ETSI/DVB and ISO/IEC standards as they
     stand at the date of this Agreement, these being:
 
     .    Reference 17
 
     .    Reference 18
 
     .    Reference 19
 
     .    Reference 21
 
1.2  In addition to coded and compressed video, audio and data, the transport
     streams will include DVB SI, coded and formatted in accordance with the
     relevant ETSI/DVB and ISO/IEC standards which apply from time to time,
     which as at the date of this Agreement are:
      
     .    Reference 7
 
     .    Reference 9
 
     .    Reference 10
 
     .    Reference 11
 
     .    Reference 13
 
     .    Reference 22

1.3  Any DVB subtitling included in Data will be coded and formatted in
     accordance with Reference 25.

1.4  Any DVB Teletext included in Data will be coded and formatted in accordance
     with Reference 30.

1.5  Any data services included in Data will be coded and formatted in
     accordance with the relevant ETSI/DVB and ISO/IEC standards which apply
     from time to time, which as at the date of this Agreement are under
     development in the DVB Technical Module.

1.6  Although the Data will initially be supplied by the BBC unscrarnbled, at
     some time in the future the video/audio/data conveyed within these Data may
     be scrambled in accordance with Reference 23.

2    TRANSPORT STREAM BIT-RATE

2.1  The transport stream bit-rate provided by the BBC at each regional studio
     centre shall be less than or equal to 24.000 Mbits/s of which an agreed
     minimum of number kbits/s will be in the form of null packets.

2.2  No constraints shall be made by CTI on the BBC regarding the particular
     temporal distribution of these null packets.

3    BBC FEED ARCHITECTURE

3.1  At each regional studio centre the BBC intends to use duplicated MPEG-2
     multiplexers in a 1+1 redundant configuration.

3.2  The appropriate multiplexer output will be selected under automatic control
     using downstream 2:1 coaxial switches.

                                       1
<PAGE>
 
3.3  Duplicate feeds of the selected output transport stream will therefore be
     provided in DVB-ASI byte mode form from these managed switches. The DVB-ASI
     transport stream physical interface is defined in Reference 24.

3.4  The contractual boundary at each studio centre will be the outputs of these
     managed switches.

3.5  The BBC will provide CTI with accommodation and power in accordance with
     the site sharing agreement in Schedule 10.

3.6  The sources of regional multiplexes are as follows:

               --------------------------------------------- 
               REGION              STUDIO CENTRE        
               ---------------------------------------------  
               East (E)            Norwich                    
               ---------------------------------------------  
               East Midlands       Nottingham                 
               ---------------------------------------------  
               Midlands            Birmingham                 
               ---------------------------------------------  
               North (N)           Leeds                      
               ---------------------------------------------  
               North East (NE)     Newcastle                  
               ---------------------------------------------  
               North West (NW)     Manchester                 
               ---------------------------------------------  
               South (S)           Southampton                
               ---------------------------------------------  
               South East (SE)     Television Centre, London  
               ---------------------------------------------  
               South West (SW)     Plymouth                   
               ---------------------------------------------  
               West (W)            Bristol                    
               ---------------------------------------------  
               West Anglia         Cambridge                  
               ---------------------------------------------  
               Northern Ireland    Belfast                    
               ---------------------------------------------  
               Scotland            Glasgow                    
               ---------------------------------------------  
               Wales               Cardiff                    
               ---------------------------------------------   

                                       2
<PAGE>
 
                                  SCHEDULE 8

                             OPERATIONAL SERVICES

1    SERVICE LEVEL AGREEMENT

1.1  It is intended that the day-to-day administration of this Agreement be the
     subject of a formal service level agreement (SLA) between CTI and the BBC.
     The SLA will be jointly developed by the BBC and CTI during the first six
     months of this Agreement, and the BBC and CTI agree to progress this in a
     timely fashion and in good faith.

1.2  The operational service requirements described in the subsequent paragraphs
     will form the basis of the SLA, and shall apply until the SLA has been
     completed and agreed.

2    MONITORING SERVICES

2.1  General
2.1.1     CTI shall operate the DTT Transmission Service in such a way as to
          comply with the technical parameters set out in Table I for each
          Station, 24 hours a day.

2.1.2     CTI shall maintain and enhance its existing network of TV dealer
          contacts who are used to collate information on the quality of BBC TV
          reception, and report annually on its status.

2.2  Process

2.2.1     Continuous

2.2.1.1   CTI are responsible for the quality of the DTT signal from the
          Interface to the point of radiation from the transmit antenna at each
          Station. CTI shall continuously monitor the signal at points
          throughout the distribution system in order to confirm that the signal
          meets the parameters set out in Table 1 relevant to the monitoring
          point. If the signal fails to meet those parameters, CTI shall ensure
          that the monitoring equipment normally alerts the TOC via the primary
          communications link within 120 seconds of the failure commencing.
          Should the primary communications link fail, CTI shall ensure that the
          monitoring equipment alerts the TOC via a back-up communications link
          within 300 seconds of the failure commencing.

2.2.1.2   The parameters monitored continuously shall include:

     i)   the integrity and decodability of the MPEG transport stream received
          at the Interface

     ii)  the integrity and decodability of the broadcast MPEG transport stream

     iii) transmitter power (and therefore, indirectly, effective radiated
          power)

     iv)  equivalent loss of noise margin (see Note 1 below)

     v)   SI integrity

2.2.1.3   The monitoring provided by CTI shall be sufficient to identify that a
          failure has occurred, and the part of the Transmission Network at
          fault. Transport Stream monitoring shall be in accordance with
          Reference 33.

2.2.1.4   CTI and the BBC recognise that the monitoring regime will change over
          the life of this Agreement as measurement requirements change, and new
          techniques and equipment become available. CTI shall ensure that all
          monitoring is carried out in line with best industry practice, subject
          to a joint annual review by the BBC and CTI of the list of parameters
          to be monitored, the effectiveness of the monitoring and the
          mechanisms by which the monitoring takes place.

2.2.1.5   CTI and the BBC agree that the asterisked numbers in the algorithm set
          out in Appendix 1 will be reviewed in accordance with the impact of
          transient errored seconds on the viewer. Such review may require use
          of different parameters.

                                       1
<PAGE>
 
2.2.1.6   CTI shall procure test equipment to permit measurement of all
          parameters on a non-intrusive basis as soon as reasonably practicable,
          the type and quantity and timing of the acquisition of such test
          equipment to be reviewed and agreed at the joint annual review.

2.2.1.7   CTI are not responsible for validating the editorial content of the
          MPEG transport stream received at the Interface.

2.2.1.8   Faults not detected by the CTI monitoring system, but reported by BBC
          staff, CTI staff or third parties and notified to CTI will be
          investigated by CTI. Confirmed faults will be treated as Incidents for
          the purposes of this Agreement. Incidents detected in such a way will
          be deemed to have started at the time reported, unless evidence of an
          earlier start time can be established by the BBC or CTI. CTI shall
          keep full records of, and report at least annually on, the number of
          Incidents detected in this way. If the BBC considers that the number
          of faults which go undetected by the CTI monitoring system is
          significant, CTI shall take all reasonable steps to remedy the
          deficiency at its own cost.

     Note 1

     While this Agreement requires the measurement of the equivalent loss of
     noise margin or an agreed replacement parameter on a continuous basis, the
     BBC recognise that the state of technology pertaining at the time of
     commencement of the Agreement does not permit this. Subject to the periodic
     review of measuring equipment referred to in paragraph 2.2.1.6, the BBC
     will agree to a temporary relaxation whereby the equivalent loss of noise
     margin will be evaluated during the periodic tests described in paragraph
     2.2.2.1or at other times by mutual agreement, following the procedure
     described in Note 6 to Schedule 6, Part 2.

2.2.2     Periodic
2.2.2.1   CTI shall measure the parameters and confirm the correct operation of
          every DTT transmitter system at least once per year. The tests shall
          also cover the correct performance, operation and selection of reserve
          equipment where installed. The results of these tests and measurements
          shall be made available to the BBC on request. CTI shall maintain
          sufficient books and records to ensure this information can be
          obtained and shall retain records of such information for the duration
          of this Agreement, or in the case of a dispute, for such a greater
          length of time as is necessary to resolve it. Any interruptions to
          service required to make these measurements will be Accountable
          Incidents unless otherwise agreed.

2.2.2.2   Parameters checked shall include, but not be limited to:

     i)   the group-delay variation across the DTT signal bandwidth (see Note 2
          below)

     ii)  the out-of-band emission of the DTT signal

     iii) the out-of-band emission of analogue signals which are co-channel with
          the DTT signal, arising as a result of analogue signals which are
          adjacent channel to the DTT signal

     iv)  centre frequency

     v)   general compliance with the WT Act licence conditions in accordance
          with best industry practice

     Note 2

     Until such time as this measurement can be made non-intrusively, the group
     delay will be inferred by measuring the amplitude response across the DTT
     signal bandwidth. If the amplitude response indicates that there may be a
     group delay problem, then the BBC will require the intrusive group-delay
     measurement to be made. The interruption required to make this measurement
     will be accountable, unless the group delay variation subsequently proves
     to be in specification.

2.2.3     Ad Hoc
2.2.3.1   In addition to the periodic measurements described above, the BBC will
          make random checks of all material aspects of transmitter performance.
          In the first instance, the measurements will be made off-site. If the
          measurements indicate that it is likely that a transmitter is failing
          to meet the performance or other criteria, the BBC may require CTI to
          demonstrate the performance of that transmitter to the satisfaction of
          the BBC within five working days of the BBC giving notice to CTI. The
          tests included in this process

                                       2
<PAGE>
 
          will be at the discretion of the BBC, and may be more extensive than
          those required by paragraph 2.2.2.2 above. CTI will co-operate with
          this process by providing access to the relevant Station and suitable
          test equipment free-of-charge. The BBC reserves the right to also make
          the measurements using its own test equipment. Any interruptions to
          service required to make Ad-hoc measurements under this clause will be
          Accountable Incidents unless CTI are subsequently exonerated.

2.2.4     Auditing
2.2.4.1   The BBC may require CTI to disclose, free-of-charge to the BBC, other
          Station-specific information pertinent to this Agreement for
          correlation with Incident reports and for general auditing purposes.
          Such information may include, but not be limited to WT Act licence
          details, telemetry data, and auditable information which can confirm
          the correct operation of a Station over an extended period. CTI shall
          maintain sufficient books and records to ensure this information can
          be obtained and shall retain records of such information for the
          duration of this Agreement, or in the case of a dispute, for such a
          greater length of time as is necessary to resolve it. The BBC accept
          that raw (unprocessed) status data will only be automatically retained
          for a period of 30 days due to its volume.

2.3  Standards
2.3.1     Performance Classification
2.3.1.1   Performance limits are defined as follows:

     Operating Limits  The Performance Standards expected from a Station under
                       normal operating conditions.

     Failure Limits    The Performance Standards at which a significant number
                       of viewers with satisfactory receiving installations who
                       normally receive a service from a Station would not
                       receive a useable signal.

2.3.2     Measurements

2.3.2.1   Measurements undertaken by CTI shall be carried out with the test
          equipment listed in Table 1, and using techniques agreed with the BBC.
          All such test equipment must have a current certificate of
          calibration, and documentary evidence of this fact must be recorded
          with measurement results. Any changes to the methods of measurement or
          type of test equipment employed by CTI must be agreed with the BBC in
          advance.

2.3.3     [*]  
               
[*]       indicates where text has been omitted pursuant to a request for
          confidential treatment. The omitted text has been filed with the
          Securities and Exchange Commission separately.
          .....................................................................

                                       3
<PAGE>
 
[*]  

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       4
<PAGE>
 
3.[*]

[*]    indicates where text has been omitted pursuant to a request for 
       confidential treatment. The omitted text has been filed with the
       Securities and Exchange Commission separately.

                                       5
<PAGE>
 
[*]

3.1.5     Logging Requirements

3.1.5.1.  CTI shall record the following information for every Station as part
          of the continuous monitoring process outlined in paragraph 2.2.1.:


          i)   the date, time and duration in whole seconds of Accountable 
               Incidents

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
                                       6

<PAGE>
 
          ii)  the date, time and duration in whole seconds of Non-accountable
               Incidents

3.1.6     Reportable Incidents
3.1.6.1   All Incidents are Reportable.

3.2  Operational
3.2.1     General
3.2.1.1   CTI will notify the BBC as soon as reasonably possible upon becoming
          aware of a Reportable Incident. Where practicable, CTI will also
          inform the BBC of the likely duration of the Reportable Incident, and
          the steps being taken to rectify it.

3.2.1.2   The detailed Incident reporting procedure will comprise part of the
          SLA, but it will be based on the following summary requirements.

3.2.2     Relationships
3.2.2.1   Routine operational business will be conducted on a day-to-day basis
          between the BBC and CTI nominated operational points-of-contact,
          copying information to the relevant contractual representatives as
          necessary. If a dispute arises, it should be escalated to the
          nominated contractual representatives of the parties.
 
3.2.3     Incident Reports
3.2.3.1   General
3.2.3.1.1 Incident reports will only be initiated for Incidents lasting 60
          seconds or more.
3.2.3.1.2 The Incident reporting procedure will vary depending on the severity
          of the Incident, and the type of Station affected. An indication of
          the BBC's initial reporting requirements is given in Table 2 below.
          Both the BBC and CTI recognise that these requirements may need to be
          modified in the light of operational experience, and so the reporting
          mechanism will be subject to a joint annual review.

     Table 2

<TABLE>
<CAPTION>
                                       OPERATIONAL PRIORITY STATIONS             OTHER STATIONS  
                                   ----------------------------------------------------------------------
REPORT TYPE                              1        2        3                 1         2        3
- ---------------------------------------------------------------------------------------------------------
<S>                                <C>            <C>      <C>               <C>       <C>      <C>                               
INCIDENT TYPE
- ---------------------------------------------------------------------------------------------------------
Failure to transmit the multiplex       X                                               X
- ---------------------------------------------------------------------------------------------------------
Transmission of Wrong Programme         X                                               X
- ---------------------------------------------------------------------------------------------------------
Failure to transmit a decodable         X                                               X
 multiplex
- ---------------------------------------------------------------------------------------------------------
RF parameters below failure limit       X                                               X
- ---------------------------------------------------------------------------------------------------------
Unavailable ES above failure limit      X                                               X
- ---------------------------------------------------------------------------------------------------------
Radiated COFDM BER above failure        X                                               X
 limit
- ---------------------------------------------------------------------------------------------------------
Transport stream invalid                X                                               X
- ---------------------------------------------------------------------------------------------------------
Failure to transmit the SI                        X                                     X
- ---------------------------------------------------------------------------------------------------------
Failure to transmit other component               X                                     X
 part(s)
- ---------------------------------------------------------------------------------------------------------
RF parameters below operating limit               X                                     X
- ---------------------------------------------------------------------------------------------------------
COFDM BER above operating limit                   X                                     X
- ---------------------------------------------------------------------------------------------------------
</TABLE>

3.2.3.2    Report Type 1

3.2.3.2.1  A telephone report summarising the nature of the Incident shall be
           made by the CTI Operational Point-of-Contact to the BBC Operational
           Point-of-Contact within 5 minutes of the Incident being reported
           manually or electronically to the TOC, and again within 5 minutes of
           the end of the Incident. A written report shall be issued by the CTI
           operational point-of-contact to the BBC Operational Point-of-Contact
           and the BBC Representative within 10 minutes of end of the Incident.

3.2.3.3    Report Type 2
3.2.3.3.1  A written report shall be issued by the CTI operational point-of-
           contact to the BBC Operational Point-of-Contact and the BBC
           Representative within 10 minutes of the Incident being reported
           manually or electronically to the TOC, and within 10 minutes of the
           end of the Incident.

                                       7
<PAGE>
 
3.2.3.4    Report Type 3
3.2.3.4.1  The Incident details shall be included in the monthly contractual
           report.

3.2.4      Planned Interruptions
3.2.4.1    CTI shall issue a calendar of Planned Interruptions proposed for the
           succeeding 12 months on a monthly basis to the BBC Operational Point-
           of-Contact, and copied to the BBC Representative.

3.2.4.2    Actual requests for BBC agreement to Planned Interruptions shall be
           made by CTI as far in advance as possible, and in any case not less
           than 14 days in advance of the commencement date requested for the
           work.

3.2.4.3    Exceptionally, CM may need to request BBC agreement to a Planned
           Interruption with less than 14 days' notice. The BBC will use
           reasonable endeavours to consider such requests, but does not
           guarantee to do so. Significant levels of short-notice Planned
           Interruptions will invoke the escalation procedures.

3.2.4.4    Text-based confirmation of agreed Planned Interruptions shall be
           issued by the CTI operational point-of-contact to the BBC Operational
           Point-of-Contact, and copied to the BBC Representative both at the
           time of the planning and at the time the work is scheduled to take
           place.

3.3  Contractual
3.3.1      General
3.3.1.1    The detailed Contract reporting procedure will comprise part of the
           SLA, but it will be based on the following summary requirements:

3.3.2      Relationships
3.3.2.1    Routine contractual business will be conducted between the BBC and
           CTI nominated contractual representatives.

3.3.3      Performance Reporting
3.3.3.1    A Contractual report shall be sent by CTI to the BBC Representative
           on or before the 10th of each calendar month. The exact format of the
           report will be defined during the first six months of this Agreement,
           but will cover the following points as a minimum:

3.3.3.2    For the previous month

     i)    Unweighted Accountable performance by transmission.

     ii)   Unweighted. Non-accountable performance by transmission.

     iii)  Weighted Accountable performance by transmission.

     iv)   Weighted Non-accountable performance by transmission.

     v)    Response time performance against target for Stations in

     vi)   Table 3.

     vii)  Response time performance against target for other Stations.

     viii) Commentary expanding on significant variances from the target.

3.3.3.3    For the previous six months

     i)    Average unweighted Accountable performance by transmission.

     ii)   Average unweighted Non-accountable performance by transmission.

     iii)  Average weighted Accountable performance by transmission.

     iv)   Average weighted Non-accountable performance by transmission.

     v)    Service Credits incurred in the month of the report.

                                       8
<PAGE>
 
3.3.4      Meetings
3.3.4.1    The BBC and CTI Contract Representatives shall meet monthly, or less
           frequently by mutual agreement, to undertake a contract performance
           review.

3.4  Information Access
3.4.1      CTI will provide an on-line data service. CTI are also to maintain an
           up-to-date database containing all Reportable Incident details. Such
           details will be maintained for at least the term of this Agreement.
           The BBC shall be given on-line access to this database by CTI from
           two separate locations to enable it to check the accuracy of fault
           reporting, and for ad-hoc performance enquiries.

3.4.2      The database shall contain as a minimum for each Station:

     i)    technical details

     ii)   transmitter maintenance team identity

     iii)  all Incident reports as issued to the BBC

     iv)   Incident dates and durations

     v)    Incident details

     vi)   Incident response time

     vii)  current availability figure on a monthly basis

     viii) historical availability figures on a monthly basis

     ix)   service message archive

3.4.3      The BBC requires CTI to provide a customised database Graphical User
           Inter-face (GUI) which will permit the production of ad-hoc enquiry
           reports by the BBC in real time. It is intended that the design of
           this GUI will be finalised by agreement between the parties during
           the first six months of this Agreement, and the BBC and CTI agree to
           progress this in a timely fashion and in good faith.

4    PUBLIC ACCOUNTABILITY SERVICES
4.1  VIEWER COMPLAINTS
4.1.1     If CTI receives complaints from members of the public about problems
          with receiving the BBC multiplex or otherwise relating to the BBC's
          programmes, it shall not make comment but refer all such members of
          the public to the appropriate BBC Customer Services department. CTI
          shall only discuss problems with its network of dealer contacts
          referred to in 2.1.2 above.

5    PERFORMANCE MEASURES [*] 
[*]       indicates where text has been omitted pursuant to a request for
          confidential treatment. The omitted text has been filed with the
          Securities and Exchange Commission separately.
          ....................................................................

                                       9
<PAGE>
 
[*]  

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      10
<PAGE>
 
[*]  

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      11
<PAGE>
 
[*]  

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      12
<PAGE>
 
[*]  

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      13
<PAGE>
 
[*]  

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      14
<PAGE>

     [*] 
     
     [*]  indicates where text has been omitted pursuant to a request for
          confidential treatment. The omitted text has been filed with the
          Securities and Exchange Commission separately.

                                      15
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      16
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      17
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      18
<PAGE>
 
                                  SCHEDULE 9

                       FORM OF PARENT COMPANY GUARANTEE

THIS GUARANTEE is made the 10th day of February 1998 BETWEEN:

(1)  CASTLE TRANSMISSION SERVICES (HOLDINGS) LTD whose registered office is at
     Warwick Technology Park, Gallows Hill, Heathcote Lane, Warwick CV34 6TN
     (the "GUARANTOR"); and

(2)  THE BRITISH BROADCASTING CORPORATION, a corporation incorporated under
     Royal Charter, whose principal office is at Broadcasting House, Portland
     Place, London W1A 1AA (the "BBC").

WHEREAS

(A)  By an agreement of even date between the BBC and CTI, CTI has agreed to
     provide certain transmission and related services to the BBC (the
     "TRANSMISSION AGREEMENT").

(B)  CTI is a wholly owned subsidiary company of the Guarantor as defined in the
     Companies Act 1985.

(C)  The Guarantor has agreed to guarantee (upon and subject to the terms set
     out in this Guarantee) the due performance and observance by CTI of all its
     obligations under the Transmission Agreement.

     IN CONSIDERATION of the BBC having agreed to enter into the Transmission
     Agreement, it is hereby agreed as follows:

1    DEFINITIONS

     In this Guarantee terms and expressions defined in the Transmission
     Agreement shall, save where the context otherwise requires, have the same
     meanings herein.

2    GUARANTEE OF PERFORMANCE
2.1  The Guarantor hereby unconditionally and irrevocably guarantees to the BBC
     the due and punctual performance and observance by CTI of all the
     obligations of CTI under and pursuant to the Transmission Agreement and
     agrees to indemnify the BBC on an after-tax basis against all losses,
     liabilities, costs, charges, expenses, actions, proceedings, claims and
     demands which the BBC may suffer through or arising from any breach by CTI
     of its obligations under and pursuant to the Transmission Agreement.
     Without prejudice to the provisions of clause 3 of this Guarantee, the
     amount which the BBC shall be entitled to recover from the Guarantor
     hereunder in respect of or arising from any breach or default by CTI in the
     performance of its obligations or liabilities under or pursuant to the
     Transmission Agreement shall not exceed the amount for which CTI itself is
     or would be liable in respect of such breach or default, save that the
     foregoing limitation does not apply in respect of costs and expenses
     incurred by the BBC in enforcing the Guarantor's obligations under this
     Guarantee.

2.2  If and whenever CTI defaults for any reason whatsoever in the performance
     of any obligation or liability undertaken or expressed to be undertaken by
     it under or pursuant to the Transmission Agreement, the Guarantor shall
     upon demand perform (or procure performance of) and satisfy (or procure the
     satisfaction of) the obligation or liability in regard to which such
     default has been made in the manner prescribed in the Transmission
     Agreement and so that the same benefits shall be conferred on the BBC as it
     would have received if such obligation or liability had been duly performed
     and satisfied by CTI.
     
[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.
        
                                       1
<PAGE>
 
3      PRIMARY OBLIGATION

3.1    The Guarantor is deemed to be a principal debtor in respect of its
       obligations under this Guarantee and not merely a surety and accordingly
       shall not be discharged nor shall its liability be affected by any act,
       omission or means whereby it would not have been discharged or its
       liability would not have been affected if it had been a principal debtor.

3.2    The BBC shall not be obliged, before enforcing this Guarantee, to have:

3.2.1     taken any action or proceedings against CTI; or
          
3.2.2     obtained any judgment against CTI; or   
                                                  
3.2.3     proven in any winding-up of CTI or agreed with CTI (or any
          administrator, liquidator, receiver or similar person) the amount of
          any liability of CTI to the BBC; or
          
3.2.4     enforced any other security held by it in respect of the obligation of
          CTI under the Transmission Agreement; or 

3.2.5     exercised, levied or enforced any distress, diligence or other process
          of execution against CTI.

3.3    This Guarantee shall be in addition to, and not in substitution for, any
       rights or remedies that the BBC may have against CTI arising under or in
       respect of the Transmission Agreement or otherwise and may be enforced
       without first having recourse to any such rights.

3.4    The liability of the Guarantor under this Guarantee shall not be
       diminished by any matter (including without limitation any amendment to
       or variation of the Transmission Agreement, or any assignment of this
       Guarantee or any administration or winding-up order) that might restrict
       the ability of the BBC to bring any action or proceedings against CTI

4      CONTINUING GUARANTEE

4.1    This Guarantee shall be a continuing guarantee and shall continue in
       force and effect irrespective of the enforceability of any other
       provision of the Transmission Agreement.

4.2    Neither the winding-up, liquidation, dissolution, bankruptcy or any other
       disability, limitation, incapacity, event or circumstance in relation to
       the Guarantor or CTI nor any change in their respective certificates of
       incorporation, memorandum and articles of association, status, function,
       control or ownership shall terminate the liability under this Guarantee.

4.3    This Guarantee shall terminate when all obligations to be performed or
       discharged by CTI under the Transmission Agreement have been irrevocably
       performed or discharged.

4.4    This Guarantee is in addition to and without prejudice to and not in
       substitution for or derogation of any other rights or security held by
       the BBC or any person for whose benefit this Guarantee is given in
       respect of the performance and observance of the obligations of CTI under
       the Transmission Agreement and shall extend to any costs, charges and
       expenses reasonably incurred by the BBC in enforcing or seeking to
       enforce this Guarantee.

5      REPRESENTATIONS AND WARRANTIES

       The Guarantor hereby represents and warrants to the BBC that:
5.1    it has audited assets of more than (Pounds)100 million;

5.2    it has the power to enter into, perform and comply with all of its
       obligations under this Guarantee;

[*]    indicates where text has been omitted pursuant to a request for
       confidential treatment. The omitted text has been filed with the
       Securities and Exchange Commission separately.

                                       2

<PAGE>
 
5.3   the execution and performance of this Guarantee does not breach its
      constitutional documents or any agreement by which it is bound;

5.4   this Guarantee has been duly authorised by it and all necessary consents
      and authorisations required by it in relation to this Guarantee have been
      obtained and are in force; and

5.5   all other actions, conditions and things required to be taken, fulfilled
      and done in order to enable it lawfully to enter into and exercise its
      rights and perform and comply with its obligations under this Guarantee,
      have been taken, fulfilled and done.

6     ASSIGNMENT AND SUCCESSORS

6.1   The BBC shall be entitled to assign the benefit of this Guarantee to any
      firm, person or company to whom or to which the BBC shall make an
      assignment of its interest under the Transmission Agreement.

6.2   The Guarantor shall not assign or otherwise transfer, dispose of or part
      with any of its rights or obligations under this Guarantee to any person
      or deal in any other manner with this Guarantee without the prior written
      consent of the BBC, such consent not to be unreasonably withheld. Any
      purported assignment in violation of this sub-clause 6.2 shall be
      ineffective.

7     JURISDICTION

7.1   Other than as set out above this Guarantee will be governed by and
      construed and interpreted in accordance with English law, and the parties
      will be subject to the non-exclusive jurisdiction of the English courts.

8     NOTICES

8.1   Any notice to be served by either party shall be in writing and shall be
      sent to the following addresses:

      GUARANTOR   The Company Secretary
         Castle Transmission Services (Holdings) Ltd
         Warwick Technology Park
         Gallows Hill
         Heathcote Lane
         Warwick CV34 6TN

      BBC         Director, Policy and Planning
         British Broadcasting Corporation
         Broadcasting House
         London W1A 1AA
         Fax No. 0171 436 0393

8.2   Any notice, invoice or other document which may be given by either party
      under this Guarantee will be deemed to have been duly given if left at or
      sent by post (whether by letter or, where the parties agree in writing, in
      any other form) or facsimile transmission to the address set out above or
      to any other address notified to each other in writing in accordance with
      this clause as an address to which notices, invoices and other documents
      may be sent. Any such communication will be deemed to have been made to
      the other party:

8.2.1     if sent by hand, when delivered;

8.2.2     if sent by post, 72 hours after the envelope containing such notice
          was posted; or

[*]   indicates where text has been omitted pursuant to a request for
      confidential treatment. The omitted text has been filed with the
      Securities and Exchange Commission separately.

                                       3
<PAGE>
 
8.2.3  if sent by facsimile, when the transmission of the facsimile is confirmed
       delivered complete (if delivered on a business day) or if not at 9.30
       a.m. (British Standard Time) on the next business day.

For the purposes of this Clause business day means 9 a.m. to 5 p.m. Monday to
Friday every week of the year except for English public and bank holidays. It is
further agreed that notices sent by facsimile will also be confirmed by sending
a signed copy by post, the copy to be posted within 24 hours of sending of the
facsimile.

IN WITNESS whereof this document has been executed as a Deed the day and year
first before written.


The COMMON SEAL of CASTLE
TRANSMISSION SERVICES
(HOLDINGS) LTD was hereunto affixed
in the presence of:

Director

Secretary

The COMMON SEAL of THE BRITISH
BROADCASTING CORPORATION was
hereunto affixed in the presence of:

Director

Secretary

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       4
<PAGE>
 
                                  Schedule 10


                        form of site Sharing Agreement

[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       1
<PAGE>
 
                            DATED 10 February 1998



                     THE BRITISH BROADCASTING CORPORATION


                                      and


                     CASTLE TRANSMISSION INTERNATIONAL LTD



                                   AGREEMENT
                     FOR THE USE OF BUILDING/ROOF-TOP SITE
                              SHARING FACILITIES



                              LINKLATERS & PAINES

                                One Silk Street
                                London EC2Y 8HQ

                              Tel: 0171-456 2000

                                 Ref: RMBD/GHC


[*]  indicates where text has been omitted pursuant to a request for 
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       1

<PAGE>
 
THIS AGREEMENT is made on 10 February 1998 BETWEEN:

(1)  THE BRITISH BROADCASTING CORPORATION whose principal address is at
     Broadcasting House, Portland Place, London W1 A 1 AA ("the BBC"); and

(2)  CASTLE TRANSMISSION INTERNATIONAL LTD (registered number 3196207), a
     company incorporated under the laws of England and Wales whose principal
     place of business is at Warwick Technology Park, Gallows Hill, Heathcote
     Lane, Warwick CV34 6TN ("TX CO");

IT IS AGREED AS FOLLOWS:

1    The licensed use of the BBC's Building(s) (as described in the Building
     Schedule(s) annexed hereto) will be provided by the BBC and taken by Tx Co
     in accordance with and subject to the particulars and provisions set out in
     the following attachments:

     (a)  The Building Licence Site Sharing General Conditions (Issue 1) or such
          amended conditions as may from time to time be substituted by the BBC
          with the prior consent in writing of Tx Co (the "GENERAL CONDITIONS")

     (b)  the "BUILDING SCHEDULES" (which term will include all Supplemental
          Building Schedules and Termination Notices (if any) appended from time
          to time in accordance with the provisions of the General Conditions

     (collectively referred to as the "AGREEMENT")

2    The Agreement is entered into and forms part of a digital terrestrial
     television services agreement made between Tx Co and the BBC of even date
     (the "DTT SERVICES AGREEMENT")

3    To the extent that there is an inconsistency between the terms of the
     Agreement and the DTT Services Agreement the terms of the DTT Services
     Agreement shall prevail.


     Signed by the BBC /s/ Patricia Hodgson   Signed for Tx Co /s/ Alan Rees
                       --------------------                    -----------------
     Name  Patricia Hodgson                   Name  Alan Rees
          ---------------------------------        ----------------------------
     Title Director of Policy and Planning    Title Chief Operating Officer
           --------------------------------         ----------------------------
                                       
[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       1
<PAGE>
 
     THE BUILDING LICENCE SITE SHARING GENERAL CONDITIONS ("THE GENERAL
     CONDITIONS") (ISSUE 1)

1    DEFINITIONS & INTERPRETATIONS

     In these conditions except where the Agreement otherwise requires the
     following expressions will have the meanings set out opposite them:

     "THE BBC" means the British Broadcasting Corporation (acting through the
     BBC Representative).

     The "BBC REPRESENTATIVE" means a person or person(s) nominated to Tx Co
     from time to time by the BBC to be its contractual point of contact. The
     initial BBC Representative will be Mark Evans.

     "BUILDING(S)" means the land and/or building(s) and related structures
     named in Clause 2 of the Building Schedule(s) (collectively "BUILDING(S)")
     the use of which may (as the case may be) be deleted from the Agreement by
     the removal of a Building Schedule pursuant to a Termination Notice or
     added to the Agreement by the addition or substitution of one or more
     Building Schedule(s) both in accordance with the provisions of General
     Condition 16.

     "BUILDING SCHEDULE(S)"/"SUPPLEMENTAL BUILDING SCHEDULE(S)" means those
     Schedules appended to the Agreement describing Tx Co's Equipment for which
     it is agreed Facilities at one or more of the Building(s) are to be
     provided.

     "CHARGES" means the charges and the additional charges (if any) for the
     Facilities for Tx Co's Equipment in respect of the Building(s) set out in
     Clause 5 of the Building Schedule(s).

     "COMMENCEMENT DATE" means the date set out in Clause 3 of the Building
     Schedule(s) in respect of each Building which is a date agreed between the
     BBC Representative and Tx Co, being a date not less than 30 days after Tx
     Co has given to the BBC Representative notice of Tx Co's intention to
     install equipment relating to DTT Services in a particular Building.

     "DTT SERVICES" means the services to be provided by Tx Co described or
     referred to in the DTT Services Agreement.

     "DUE DATE" means (in relation to any of the Charges and any other payments
     due under the Agreement) the commencement of the relevant charging period
     as described in the Building Schedule(s) (or where this is not applicable,
     30 days after the issue of an invoice in respect of the same).

     "EQUIPMENT HOUSING" means that part of the Building(s) used primarily to
     house Tx Co's Equipment and as the same is described in Clause 10 of the
     Building Schedule.

     "FACILITIES" means the rights granted to Tx Co under the Agreement
     including such shared use by Tx Co with the BBC or any third party
     permitted by the BBC to use part or parts of the Building(s), and any other
     antenna support structures belonging to or otherwise under the control of
     the BBC at the relevant Building specified for this purpose) and any non-
     exclusive Equipment Housing such rights are more particularly described in
     General Condition 2.

     "FORCE MAJEURE" means any event or circumstances beyond the reasonable
     control of the defaulting party which shall include but not be limited to
     Act of God, war, civil disturbance, statutory prohibition, Government
     intervention, order or act of Government or local/public authority, acts of
     terrorism, fire, lightning, flood, adverse weather conditions which cause
     physical damage to property used to supply DTT Services, explosion,
     accident, theft or vandalism, national strike action or industrial action
     taken by a union provided that neither party
<PAGE>
 
     can rely on strikes, industrial action, theft or acts of vandalism where it
     could reasonably have expected to have prevented them or the industrial
     action or strike is by its own employees only.

     "TX CO" means Castle Transmission International Ltd (acting the Tx Co
     Representative).

     "TX CO'S EQUIPMENT" means Tx Co's Equipment described in Clause 11 of the
     Building Schedule(s) and otherwise installed at the Building(s) (which may
     include antennas and equipment bays fixed on any of the locations described
     in Clause 11 of the relevant Building Schedule(s) together with any
     necessary associated equipment (e.g. transmitters/receivers, equipment
     racking and cabling) located in the Equipment Housing or as elsewhere
     permitted in the Building). A list of any new associated equipment shall be
     provided by Tx Co to the BBC for approval as to its size, type and
     positioning at least 14 days prior to the Commencement Date (which approval
     will not be unreasonably withheld or delayed).

     "TX CO REPRESENTATIVE" means the person(s) named in Clause 1 of the
     Building Schedule(s) as the contact point or such alternative person whose
     name shall be notified to the BBC from time to time by Tx Co and who should
     be contacted initially by the BBC if there are any queries concerning the
     Agreement.

     "TX CO STATUTORY LICENCES" means any statutory licences required by TX Co
     in accordance with the terms of the Agreement.

     "PERMITTED USE" means Tx Co's use of the Building to provide DTT Services
     for the BBC via Tx Co's Equipment and/or such other uses as may be
     permitted from time to time by the BBC and as such Permitted Use is more
     particularly described in Clause 6 of the relevant Building Schedule.

     "PERMITTED CONTRACTOR(S)" means any one or more of the following:

          (i)   an employee of Tx Co;

          (ii)  an employee of a public telecommunications operator as defined
                by the Telecommunications Act 1984 (or its statutory equivalent
                for the country in question) being a person authorised to run a
                public telecommunications system;

          (iii) any third party contractor employed by Tx Co for this purpose,
                provided the BBC has been given prior notification of the name
                of such third party contractor prior to their arrival at the
                Building to carry out any permitted works;

     all of whom shall be permitted access by the BBC to the Building(s) subject
     to these General Conditions.

     "SPECIAL CONDITIONS" means any conditions set out in Clause 12 of the
     relevant Building Schedule and which shall be supplementary to these
     General Conditions save and to the extent that there is any conflict
     between any Special Conditions and the General Conditions then and for the
     relevant Building the Special Conditions shall prevail.

     "TERM" means the term described in Clause 4 of the Building Schedule(s)
     during which time the Facilities are available at the Building for the
     relevant Tx Co's Equipment and which shall commence from and including the
     Commencement Date and end on the termination of the DTT Services Agreement
     or pursuant to the variation/termination provisions contained in the
     General Conditions subject to any Special Conditions and any reference in
     the General Conditions to the Term shall be treated as a reference to the
     Term described in the Building Schedule(s) in which it appears.

     "TERMINATION NOTICE" means a written notice in the prescribed form served
     by either party on the other in relation to any one or more Building(s)
     pursuant to General Condition 16 to expire at any

                                       3
<PAGE>
 
     time during the Term for the relevant Building(s) without reference to the
     Commencement Date or the Agreement Date.

     "VAT" means valued added tax or any substitute form of taxation on the
     supply of goods and services.

2    THE FACILITIES

2.1  PERMITTED USE

     2.1.1  Subject to any Special Conditions the BBC shall during the
            subsistence of the Term:-

     (a)    permit TX Co, its employees and Permitted Contractor(s) to install,
            retain during the Term, inspect, maintain, repair, renew and remove
            as necessary (and at Tx Co's expense) Tx Co's Equipment located in
            the Equipment Housing and in, under or over such other part or parts
            of the Building(s) as the BBC shall from time to time approve (such
            approval not to be unreasonably withheld or delayed) for the
            Permitted Use described in Clause 6 of the relevant Building
            Schedule;

     (b)    permit Tx Co to share use of such part or parts of the Building(s)
            and such of the BBC's equipment therein (including any standby
            generator equipment referred to in Clause 12 of the Building
            Schedule(s)), in common with others including the BBC, as the BBC
            may from time to time approve (such approval not to be unreasonably
            withheld or delayed);

            such permission being granted by the BBC to Tx Co to facilitate the
            provision by Tx Co of DTT Services via Tx Co's Equipment or to
            facilitate any other purpose that may from time to time be approved
            by the BBC;

     2.1.2  Subject to availability of space, where the existing Equipment
            Housing, provided by the BBC, is insufficient for the provision of
            DTT Services via Tx Co's Equipment the BBC shall permit additional
            Equipment Housing to be erected and/or attached to the Building(s)
            subject to the BBC's prior approval of the specifications and
            positioning of the same and otherwise subject to the provisions of
            the General Conditions (including General Condition 2.2.1).

2.2  EQUIPMENT HOUSING

     2.2.1  The Equipment Housing shall be:-

            (i)   existing Equipment Housing located on the Building and made
                  available to Tx Co by the BBC; or

            (ii)  new Equipment Housing agreed with Tx Co and to be provided by
                  the BBC and erected by the BBC, at the BBC's cost where the
                  new Equipment Housing is required in order to provide services
                  to the BBC, or otherwise at Tx Co's cost; or

            (iii) new Equipment Housing agreed with the BBC to be provided and
                  erected under the BBC's supervision by TX Co or any Permitted
                  Contractor(s), at the BBC's cost where the new Equipment
                  Housing is required in order to provide services to the BBC,
                  or otherwise at Tx Co's cost; and

                  in either (ii) or (iii) above any such Equipment Housing shall
                  be constructed and installed in accordance with plans
                  reasonably approved by the BBC and the costs incurred (whether
                  payable by Tx Co or the BBC as aforesaid) shall include any
                  costs properly incurred by the BBC in seeking any necessary
                  planning consents (including any architects', surveyors' and
                  other professional fees in relation to applying for such
                  planning consents) in addition to the BBC's reasonable
                  supervision costs. 

                                       4
<PAGE>
 
     2.2.2  Unless Clause 5(b)(iii) of the Building Schedule(s) provides
            otherwise, TX Co shall not be responsible for the payment of any
            business rates assessed on any Building on which TX Co's Equipment
            is located. Nevertheless, and in the BBC's entire discretion, if in
            direct consequence of the installation of Tx Co's Equipment on the
            Building additional business rates are payable by the BBC in respect
            of the Building(s) or any part thereof and Tx Co's Equipment is
            being used other than to provide DTT Services to the BBC then and in
            such circumstances the BBC shall be entitled to obtain reimbursement
            from Tx Co for the amount of such increase from time to time during
            the Term.

     2.23   Save only as provided herein and in General Condition 2.2.5 below
            nothing in the Agreement shall confer on Tx Co any right to
            exclusive occupation of any Equipment Housing, (including any new
            Equipment Housing constructed on the Building(s) at Tx Co's cost),
            unless there is a specific provision in the Building Schedule(s) to
            the contrary, and Tx Co shall not object to the BBC permitting
            others (including the BBC) to share occupation of any such Equipment
            Housing on such terms as the BBC shall decide, provided such
            occupation does not cause any resulting damage to Tx Co's Equipment
            or adversely affect the performance of Tx Co's Equipment.

     2.2.4  Save only as provided in General Condition 2.2.5 (or unless there is
            a specific provision to the contrary in the relevant Building
            schedule) any Equipment Housing, whether provided by the BBC, or Tx
            Co, and irrespective of the costs paid by Tx Co, shall be deemed to
            form part of the Building upon which it is situated control of which
            shall vest in the BBC upon completion of its construction and
            installation.

     2.2.5  Notwithstanding the provisions of General Condition 2.2.4 where the
            structure used to accommodate Tx: Co's Equipment consists of one or
            more moveable equipment cubicles provided by Tx Co solely for Tx
            Co's exclusive use, such Equipment Housing shall be treated as
            belonging to Tx Co, and shall be deemed to form part of Tx Co's
            Equipment for the purpose of interpreting the General Conditions and
            shall remain in the ownership of Tx Co.

     2.2.6  Tx Co will be responsible for the security of any Tx Co's Equipment
            Housing used solely by Tx Go (including any moveable equipment
            cubicles of the kind described in General Condition 2.2.5) and shall
            provide the BBC with a key to the same to be retained by the BBC in
            a suitable secure position for use in cases of emergency and to
            enable the BBC to check that TX Co is complying with its obligations
            under these General Conditions.

2.3  ACCESS GENERALLY

     2.3.1  Subject to any additional provisions set out in Clause 7 of the
            Building Schedule(s) and otherwise subject to any Special Conditions
            the BBC grants to Tx Co the rights:-

            (i)   for Tx Co, its employees and Permitted Contractor(s) to use
                  any private access roads leading to the Building(s) which are
                  under the control of the BBC (either with or without motor
                  vehicles as the BBC shall decide) at all times and as often as
                  Tx Co shall reasonably require in order to gain access to the
                  Building(s); and

            (ii)  with effect from the Commencement Date of sufficient and
                  reasonable access to and egress from the Building(s) along
                  such routes in the Building(s) as the BBC shall from time to
                  time direct and as are reasonably necessary for Tx Co, its
                  employees and Permitted Contractor(s) in order to enjoy the
                  Facilities granted and comply with its obligations under these
                  General Conditions and to view and inspect any of Tx Co's
                  Equipment, provided Tx Co will be held responsible by the BBC
                  for the conduct of its employees and Permitted Contractor(s)
                  during any such visits to the Building(s) and Tx Co shall
                  procure that such persons comply with the relevant terms of
                  these General Conditions for this purpose;

                                       5
<PAGE>
 
            (iii) for any representatives of the Radiocommunications Agency, and
                  the Director General of Telecommunications (or their statutory
                  successors) to enter the Building(s) insofar as necessary to
                  comply with any rights of inspection reserved or implied under
                  any Tx Co Statutory Licenses.

     2.3.2  Notwithstanding the provisions of General Condition 2.3.1, Tx Co
            acknowledges that the BBC may refuse entry to any Building(s) to a
            person who does not produce a suitable identification pass or other
            means of identification as a Tx Co employee or a Permitted
            Contractor(s) or representative of any of the bodies referred to in
            General Condition 2.3.1 (iii) above to the BBC's Representative or
            his nominee at the Building(s) and further that the BBC may refuse
            admittance to and require the removal from the Building(s) of any
            person whose behavior the BBC's Representative reasonably considers
            undesirable and/or likely to disrupt the safe operation of the
            Building(s). Tx Co shall further be required to accept
            responsibility for the behaviour of any such employees or Permitted
            Contractor(s) attending the Building(s) on Tx Co's business and
            shall procure that they behave in a responsible manner and comply
            with any reasonable requests of the BBC's Representative or his
            nominee.

     2.3.3  The BBC may from time to time modify the means of access to the
            Building(s) or to Tx Co's Equipment on the Building(s) made
            necessary by any works in progress, or for reasons of safety, or
            generally in the interests of orderly management, provided that any
            such restrictions will not otherwise prevent the exercise of Tx Co's
            right to use Tx Co's Equipment pursuant to the Agreement (which
            modifications may include the imposition of reasonable instructions
            regarding admittance to the Building(s) and the number, supervision
            and times of visits which may from time to time be made by the BBC
            and notified to Tx Co).

3    24 HOUR ACCESS

     Where Tx Co requires to visit a Building which is not generally open to 24
     hour access the BBC will use all reasonable endeavours to make local
     arrangements for Tx Co which will enable 24 hour access to be available in
     times of emergency, provided in such circumstances any reasonable
     additional staff attendance costs incurred by the BBC are met by Tx Co.

4    THE CHARGES

4.1  For the duration of the relevant Term (and unless otherwise provided in the
     Special Conditions commencing on the Commencement Date set out in the
     relevant Building Schedule) Tx Co will pay to the BBC the Charges payable
     in respect of each of the Building(s) on the Due Date, Including any review
     of the Charges pursuant to the provisions of General Condition 4.2, or
     until varied in accordance with the provisions of General Condition 16,
     free of all deductions.

4.2  Unless otherwise provided in the Special Conditions, the BBC will be
     entitled to review at any time the Charges payable under this Agreement,
     but in the case of review other than:-

            (i)   in consequence of a change of Tx Co's Equipment or any other
                  change to the Facilities required by Tx Co; or

            (ii)  pursuant to General Condition 5.1;

     then such reviews will not occur more often than at annual intervals (or
     any greater intervals described in the relevant Building Schedule(s)), and
     then only on the BBC giving Tx Co not less than three months' notice in
     writing. Such variation in the Charges shall take effect from the date of
     expiry of the said notice, and shall be to an amount which the BBC will in
     its discretion determine as representing the current open market value for
     the Facilities for Tx Co's Equipment.

                                       6
<PAGE>
 
4.3  For an Agreement incorporating more than one Building Schedule if Tx Co
     wishes to have common Charges payment date(s) and/or common Charges review
     dates for all the Buildings at which Facilities are provided under the
     Agreement the date(s) stated in Clause 5(c) of the Building Schedule will
     apply, instead of those stated under Clause 5(a) of each Building Schedule,
     with effect from the date of issue of the Building Schedule in which Clause
     5(c) has been completed and shall continue until this provision is deleted
     from any subsequent Building Schedule signed by Tx Co, Issued pursuant to
     the General Conditions and appended to the Agreement.

5    ELECTRICITY

5.1  Subject to any Special Conditions, unless a separate supply is arranged,
     the BBC will use all reasonable endeavours to supply electricity to Tx Co's
     Equipment subject to Tx Co reimbursing the BBC's electricity supply charges
     in accordance with the provisions of Clause 5(b)(i) of the Building
     Schedule(s), including any periodic review of the same which the BBC may
     require at any time during the Term if Tx Co's consumption, or the local
     electricity/electricity supplier's tariff changes and/or where the BBC has
     agreed to make emergency back-up generated supplies available. The BBC
     shall not be required to discount its electricity supply costs to TX Co at
     the Building(s) to a price below the standard unit tariff price of the
     local supply company unless any discounted price obtained is solely
     attributable to Tx Co's usage.

5.2  Tx Co agrees that the BBC will not be held responsible by Tx Co for any
     failure or interruption to any electricity supply or be held liable for any
     costs or damages arising in consequence of any failure to provide the same
     caused other than in consequence of any negligent act or omission of the
     BBC.

6    ALTERATIONS/ADDITIONS TO TX CO'S EQUIPMENT

6.1  Prior to carrying out any works or alteration or addition to Tx Co's
     Equipment during the Term (including any ancillary DTT Services works
     pursuant to General Condition 9.13) Tx Co will first notify the BBC
     Representative of any such proposals, The BBC may in its discretion require
     that any such works carried out on the Building outside the boundary of any
     exclusively occupied Equipment Housing are supervised by a BBC employee
     (the reasonable costs of which must be met by Tx Co as an additional
     charge).

6.2  If any works proposed by Tx Co involve any alterations to any BBC property
     (including any part of the Building(s) or any BBC equipment), the BBC may
     consent to such works in its discretion, and may also impose conditions
     including inter alia the performance of such works by a BBC employee or
     otherwise under the supervision of the BBC and where such works are not
     required in order to provide any enhanced DTT Services for the BBC as a
     customer of Tx Co, the BBC may also impose a requirement for reinstatement
     of any BBC property or equipment to its former condition at the
     determination of the Agreement (or the determination of that part of the
     Agreement relating to the Building(s) in question where applicable) at Tx
     Co's cost.

6.3  Where any works involves any material change to the Facilities and/or to Tx
     Co's Equipment as described in the Building Schedule(s), the BBC will be
     entitled to require Tx Co to agree to vary the Building Schedule(s) in
     relation to the Building(s) in question and where appropriate amend the
     Charges in consequence.

6.4  Any works proposed by Tx Co requiring planning consent shall be subject to
     General Condition 7.

7    PLANNING

     Tx Co will not make any applications for planning permission in relation to
     the Building(s) or Tx Co's Equipment or any Equipment Housing without the
     prior approval of the BBC (such approval

                                       7
<PAGE>
 
     not to be unreasonably withheld or delayed) provided that the BBC may
     (unless otherwise agreed with Tx Co) require, as a condition of giving its
     approval, that any such application for planning consent is made by the BBC
     acting as agent for Tx Co and in such circumstances, (again unless
     otherwise agreed with Tx Co) the BBC shall be entitled to recover from Tx
     Co any reasonable costs which it incurs in acting as Tx Co's agent for this
     purpose.

8    MAINTENANCE OF TX CO'S EQUIPMENT

8.1  Tx Co will ensure that Tx Co's Equipment is maintained in generally safe
     repair and condition during the Term to the BBC's reasonable satisfaction.

8.2  Tx Co will use all reasonable endeavors not at any time electrically or
     physically to impair, disrupt, interfere with or interrupt any of the BBC's
     or any existing third party users' emissions and forthwith will use all
     reasonable endeavours to ensure the repair of any faults in Tx Co's
     Equipment which cause or may cause any such interference and will indemnify
     the BBC against any costs properly incurred by the BBC or any third party
     in remedying any such faults.

8.3  Tx Co will be responsible for keeping:-

          (i)   any Tx Co's Equipment comprising moveable equipment cubicles in
                good repair and condition; and

          (ii)  the interior of any exclusively occupied Equipment Housing which
                accommodates Tx Co's Equipment in a clean and tidy condition and
                free from its own rubbish in accordance with any reasonable
                requirements from time to time imposed by the BBC for the
                benefit of the health and safety of the users of the Building(s)
                (including Tx Co) and the efficient operation of the
                Building(s); and

          (iii) any doors or access openings comprised in any Equipment Housing
                (or Tx Co's Equipment comprising moveable equipment cubicles)
                free of obstruction.

9    OTHER OBLIGATIONS OF TX CO

     TX CO WILL:

9.1  Not start using the Facilities unless or until:-

          (i)   Tx Co has obtained any requisite Tx Co Statutory Licences in
                relation to the Facilities; and

          (ii)  the BBC has confirmed that any planning or other consents which
                it has agreed to obtain on behalf of Tx Co have been obtained
                (other than for Facilities already in place at the date of the
                Agreement for which prior agreement shall be deemed to have
                already been obtained); and

          (iii) the BBC has Issued a Building Schedule(s) in respect of the
                Facilities to be granted at the Building(s) in question and the
                Building Schedule(s) has been signed by Tx Co, dated and annexed
                to the Agreement; and

          (iv)  the agreed Commencement Date occurs.

9.2  Not start any installation of Tx Co's Equipment unless the person to be
     employed by Tx Co to carry out any such installation is a Permitted
     Contractor(s).

9.3  Where applicable and at its own expense retain throughout the Term Tx Co
     Statutory Licences other than as provided in the DTT Services Agreement of
     even date to be paid by the BBC, (including any Tx Co Statutory Licences
     necessary in respect of any additional Building(s)

                                       8
<PAGE>
 
     comprised in any Supplemental Building Schedule(s) added to the Agreement
     in accordance with the provisions of General Condition 16.7).

9.4  Tx Co agrees to attach permanent identification to all Tx Co's Equipment in
     common areas in a manner that has been agreed with the BBC Representative.

9.5  In addition to the Charges pay any other sums payable under the Agreement
     (including any due pursuant to General Conditions 2.2, 3, 6.1, 6.3, 7,
     9.11, 9.13(iii) and 16.9) on the Due Date.

9.6  Accept that no liability shall attach to the BBC or any BBC employees in
     respect of the performance, safety or suitability for its purpose of any Tx
     Co's Equipment unless the installation of the same was carried out or
     otherwise supervised by or on behalf of the BBC as part of any maintenance
     services and except insofar as the BBC is in breach of its maintenance
     obligations in respect of any Tx Co's Equipment contained in any
     maintenance services agreement.

9.7  Not erect or cause to be erected any buildings or structure or other
     erection on the Building(s) save as provided in the Building Schedule(s).

9.8  Not tamper with or carry out any unpermitted works or otherwise cause any
     damage to the Building(s) or any other equipment belonging to the BBC or
     any third party located on the Building(s).

9.9  In exercising the rights granted under the Agreement, not do or permit
     anything to cause interference, nuisance, annoyance, inconvenience, loss or
     damage to the BBC.

9.10 Not (save as permitted in General Condition 2.3.1 above) permit or allow
     any other persons to visit the Building(s) or handle Tx Co's Equipment
     without the prior written consent of the BBC.

9.11 Ensure that while at the Building(s) its employees, and Permitted
     Contractor(s) behave in a responsible manner and comply with all the BBC's
     reasonable security and/or safety requirements and in the event of any
     damage being caused to the Building(s) or to any property or equipment
     thereon belonging to the BBC or to any third party in consequence of the
     exercise of the Agreement by Tx Co, its employees or its Permitted
     Contractor(s) (and not as the result of any negligent act or omission of
     the BBC or its employees or contractors) to forthwith reinstate the same to
     the BBC's reasonable satisfaction (or where the BBC reasonable requires
     reimburse the BBC with the full costs and expenses properly incurred by it
     in carrying out such reinstatement on Tx Co's behalf).

9.12 Where any of Tx Co's Equipment is to be placed on, above or below ground
     outside the Building(s) boundaries and where the BBC is not otherwise able
     to grant any rights of installation over such ground obtain, at its sole
     expense, the agreement of any other party or parties having an interest in
     such ground prior to installation and shall indemnify the BBC fully in this
     respect.

9.13 Negotiate any ancillary DTT Services, including telephone connections which
     it requires for its use on the Building, subject to obtaining the BBC's
     prior consent (which will not be unreasonably withheld or delayed) to the
     location of any equipment relating to the same on or under the Building and
     outside the Equipment Housing, provided that Tx Co shall where such works
     are not required in order to provide any enhanced DTT Services for the BBC
     as a customer of Tx Co be responsible:-

          (i)     for arranging the removal of any such equipment at the end of
                  sooner termination of the Term at Tx Co's expense; and

          (ii)    for the costs of reinstating any damage caused to the Building
                  by such removal; and

          (iii)   for reimbursing the BBC's reasonable supervision costs.

                                       9
<PAGE>
 
9.14 Not erect or permit or suffer or allow to be erected any sign, notice or
     advertisement on the Building(s) save only such sign(s) or notice(s) as the
     BBC shall in its reasonable discretion permit and otherwise in accordance
     with these General Conditions.

9.15 In no circumstances permit or suffer or allow any of its employees or
     Permitted Contractor(s) or any other third party to reside at the
     Building(s).

9.16 Not light or permit or suffer to be lit any fire on the Building or on any
     access thereto nor block or obstruct nor permit or suffer to be blocked or
     obstructed any fire exits or access for fire fighting equipment.

10   SWITCHING OFF TX CO'S EQUIPMENT

     BY THE BBC

10.1 Without prejudice to the provisions of General Condition 8.3, Tx Co
     acknowledges that the BBC will be entitled to switch off Tx Co's
     Equipment:-

           (i)   in a life or property threatening emergency; or

           (ii)  where Tx Co's Equipment is causing interference to any of the
                 telecommunications services of other users of the Building
                 (including the BBC) and where the BBC has taken reasonable
                 measures to contact and inform Tx Co that such interference
                 exists and where practicable to do so the BBC has allowed Tx Co
                 a reasonable period to remedy any such interference caused by
                 Tx Co's Equipment, or has otherwise requested Tx Co to switch
                 off Tx Co's Equipment as required under General Condition 10.5,
                 but Tx Co has not done so and the interference still exists; or

           (iii) if required to do so by a Government authority provided that
                 the BBC shall use its reasonable endeavours to inform Tx Co of
                 such requirement before Tx Co's Equipment is switched off; or

           (iv)  with the agreement and at the request of Tx Co; or

           (v)   where Tx Co has terminated its requirement for the Facilities
                 pursuant to General Condition 16.4 but has failed to remove Tx
                 Co's Equipment; or

           (vi)  where Tx Co is in material breach of any of the terms of the
                 Agreement and has not remedied such breach within a reasonable
                 time of receiving notice from the BBC requiring it to do so.

10.2 Tx Co will provide a switch on Tx Co's Equipment to enable it to be
     switched off by the BBC in accordance with General Condition 10.1.

10.3 The BBC shall in the event of Tx Co's Equipment being switched off pursuant
     to General Condition 10.1, notify Tx Co of this fact as soon as reasonably
     practicable.

     BY TX CO

10.4 Tx Co will be required to temporarily reduce power or switch off Tx Co's
     Equipment by arrangement with the BBC Representative on being given
     reasonable prior notice (or forthwith in the case of an emergency) where
     the BBC considers the radiation level of Tx Co's Equipment is unsafe for
     access to the relevant Building for essential works by the BBC, its
     employees and contractors. In such circumstances Tx Co will be asked to
     keep Tx Co's Equipment on reduced power or switched off until all such
     persons and their equipment have completed the necessary

                                      10
<PAGE>
 
     works and vacated the relevant part of the Building. The BBC will make
     every reasonable effort to ensure such requests only occur at times when
     there will be minimum disruption to DTT Services.

10.5 Without prejudice to the provisions of General Condition 8.3, in the event
     of any interference being caused to any of BBC's emissions (or to those of
     any other lawful third party users at the Building(s)) by Tx Co's
     Equipment, Tx Co shall forthwith either eliminate the interference or where
     there is interference which cannot be remedied in such time as the BBC
     shall reasonably require, Tx Co shall switch off Tx Co's Equipment until
     such time as the interference has been eliminated, the cost of all such
     measures to be borne by Tx Co.

11   NO ENLARGEMENT OF RIGHTS

     Tx Co acknowledges that the Agreement permits Tx Co to use the Facilities
     in accordance with the Building Schedule(s) and that no provisions in the
     Agreement are intended to create nor shall be treated or construed as
     creating the relationship of landlord and tenant but merely that of the
     provider and hirer (respectively) of services and Tx Co makes no claim in
     this respect and further accepts that the BBC shall not be restrained by
     anything contained in the Agreement from using the Building(s) and any
     equipment (other than Tx Co's Equipment) for the purposes of the BBC's
     business undertaking or permitting others to use the Building(s) and any
     equipment (other than Tx Co's Equipment) including inter alia any non-
     exclusive Equipment Housing and access ways (including building risers) as
     the BBC may in its discretion decide.

12   INTEREST

     If payment of the Charges or any other fees payable under the Agreement are
     not made on the relevant Due Date, then without prejudice to any other
     rights of the BBC, Tx Co agrees the BBC may charge interest (calculated on
     a daily basis) on the outstanding amount from the Due Date until payment,
     at the rate of 2% per annum above the base rate of Lloyds Bank plc
     applicable during the time of non-payment, or where such rate cannot be
     ascertained, at 2% per annum above the average of the base rates of the
     London clearing banks in force from time to time during the period of the
     delay (without prejudice to any other right or remedy of the BBC under the
     Agreement).

13   VAT

13.1 All the Charges and other fees described in the Building Schedule or
     otherwise payable under the General Conditions are exclusive of VAT which
     shall be charged in addition thereto in accordance with the relevant law in
     force at the time of making the relevant taxable supply and shall be
     payable by the paying party only against receipt from the other of a valid
     VAT invoice in respect thereof.

13.2 Where under the Agreement one party has agreed to reimburse or indemnify
     the other in respect of any payment made or cost incurred by the other then
     the first party shall also reimburse any VAT paid by the other which forms
     part of its payment or costs incurred to the extent that such VAT is not
     available for credit for the other (or for the representative member of the
     other's VAT group) under Section 25 and 26 of the Value Added Tax Act 1994
     (or any replacement or equivalent provision).

14   NO ASSIGNMENT OR SUB-CONTRACTING

14.1 This Agreement is personal to the parties hereto and they shall not assign,
     transfer, sub-licence, share use or deal in any manner with the Agreement
     or the rights herein contained other than as expressly herein provided.

                                      11
<PAGE>
 
14.2 Each of Tx Co and the BBC shall be entitled to transfer the Agreement to
     any of its wholly owned subsidiaries provided that:-

     (a)  each party procures that the transferee is bound by a direct covenant
          with the other party to observe inter alia all the terms of this
          Agreement; and

     (b)  if any transferee ceases to be a wholly owned subsidiary of either the
          BBC or Tx Co, as the case may be, the Agreement will be transferred
          back to Tx Co or the BBC, or one of their wholly owned subsidiaries.

15   INDEMNITY (LIABILITY AND INSURANCE)

     This Agreement forms part of the DTT Services Agreement. Accordingly, the
     liabilities of the parties are as set out below.

15.1 Each party shall be responsible for the insurance of its property at the
     Building(s).

15.2 Both parties must maintain insurance against any loss, damages, claims or
     actions arising from:

     (a)   personal injury or death;

     (b)   public liability; and/or

     (c)   any other liability for which either is required by law to insure,

     arising out of the performance of this Agreement.

15.3 Tx Co must maintain insurance cover adequate to cover the risks which it is
     likely to incur in relation to the subject matter of this Agreement, with a
     minimum of:

     (a)   primary public and product liability insurance in a form reasonably
           acceptable to the BBC providing for payment of a sum up to (Pounds)50
           million for any one occurrence (or in the annual aggregate for
           product liability) and, in the case of third party property damage
           arising out of the use of private vehicles, unlimited cover and, in
           the case of third party property damage arising out of the use of
           commercial vehicles, (Pounds)5 million in respect of one occurrence;

     (b)   employer's liability insurance sufficient to meet its statutory
           requirements and sufficient to cover any liabilities to past or
           present employees;

     (c)   all risks or loss or damage to property and business interruption
           insurance in a form reasonably acceptable to the BBC in respect of
           the Building(s) and all equipment used to provide the DTT Services
           covering the full re-instatement value of all such assets and the
           reasonable cost of any replacement transmission services from the
           Building(s) or any other stations used to supply any part of the DTT
           Services; and

     (d)   professional indemnity insurance of at least (Pounds)5 million per
           year, commensurate with the nature of the risks undertaken in that
           year.

15.4 Where requested by the BBC, Tx Co agrees to provide the BBC with a copy of
     the relevant policy or policies or evidence of such insurance and its
     material terms referred to in this General Condition 15 which shall be
     treated as confidential information belonging to Tx Co. Tx Co will also
     notify the BBC of any substantive change to the insurance programme
     maintained by it and referred to in this General Condition 15 for the risks
     covered.

15.5 Where Tx Co engages Permitted Contractor(s), it shall ensure that its
     insurance includes cover for its liabilities In respect of the acts and
     omissions of the Permitted Contractor(s) or that the

                                      12
<PAGE>
 
        Permitted Contractor(s) have their own insurance with appropriate cover
        in the light of the work to be undertaken by the Permitted
        Contractor(s).

15.6    For purposes of this General Condition 15, "CONTRACTS" means this
        Agreement, the DTT Services Agreement and any other agreement between
        the parties relating to the subject matter of the Contracts.

15.7    Each of the BBC and Tx Co shall indemnify the other on an after-tax
        basis against all claims or actions brought against the other by any
        third party relating to:

        (a)  personal injury; or

        (b)  loss of, or damage to, property; or

        (c)  Harmful Interference (as defined in the DTT Services Agreement)
             caused to analogue or digital broadcasts, excepting any such claims
             made by viewers;

        caused as a result of any breach of this Agreement or any wilful or
        negligent act or wilful or negligent omission by the party from whom
        indemnification is sought. Without limiting the generality of this
        General Condition 15.7, Tx Co will indemnify the BBC on an after-tax
        basis against any claims made against the BBC by any party as a result
        of damage caused by Tx Co to the property of that party in installing,
        maintaining or operating transmitters for provision of the DTT Services.

15.8    Each of the BBC and Tx Co will indemnify the other on an after-tax basis
        against any loss incurred by the relevant party resulting from damage to
        that party's property or injury to its employees or the employees of its
        agents or sub-contractors arising out of any breach of any of its
        obligations, warranties or undertakings contained in any of the
        Contracts or any other agreements between the parties relating to the
        provision of the DTT Services or any other negligent or wilful act or
        omission of the party from whom an indemnity is sought.

15.9    The party from whom indemnification is sought shall have the right to
        conduct any proceedings brought by a third party against the other party
        or to settle any such proceedings subject to reimbursing the other party
        any costs of such proceedings and any damages, costs and expenses
        payable by the indemnified party arising out of those proceedings. Both
        parties will notify the other as soon as possible of the existence of a
        claim which is reasonably likely to give rise to a claim for
        indemnification under this General Condition 15.

15.10   Neither party excludes or restricts liability for death or personal
        injury resulting from its own negligence or from liability arising under
        the Health and Safety at Work Act 1974 or any regulations made pursuant
        to that Act.

15.11   Neither Tx Co nor the BBC shall be held responsible for the consequences
        of any act or omission or misconduct of any third party, unless:

        (a)  such third parties are in the employment of or providing sub-
             contracted services to either Tx Co or the BBC at the time the
             incident takes place; or

        (b)  the party claimed against has recovered damages in respect of such
             act, omission or misconduct directly from the relevant third party
             or otherwise where it has recovered insurance (and in each such
             case to the extent of such recovery or insurance claim) provided
             that where such party is entitled to claim damages and/or recover
             under such insurance policy it shall use all reasonable endeavors
             to do so as soon as reasonably practicable.

15.12   The BBC, shall not be liable, whether in contract, tort, negligence,
        breach of statutory duty or otherwise to Tx Co for loss of profits other
        than any element of profit comprised in the Charges 

                                      13
<PAGE>
 
       (as defined in the DTT Services Agreement) or for any indirect, special,
       incidental or consequential loss whatsoever arising out of its
       performance of or failure to perform any of the Contracts or otherwise.

15.13  The BBC's liability for all matters under the Contracts, other than for
       payment of the Charges (as defined in the DTT Services Agreement) or for
       payment of any of the termination sums provided for in Clause 12.2 of the
       DTT Services Agreement or for any sums payable in respect of Tx Co's
       Equipment or in respect of the repudiatory breach of any of the Contracts
       or in respect of the content indemnity contained in Clause 4.2.3 of the
       DTT Services Agreement, shall be limited to one million pounds
       ((Pounds)1,000,000) in any year or, if greater, the amount recovered by
       the BBC in respect of and to the extent attributable to such loss
       pursuant to any insurance policy maintained by the BBC.

15.14  Tx Co's total aggregate liability in respect of all matters under or
       arising out of the Contracts in any one year, including in relation to
       the payment of liquidated damages and/or Service Credits (as defined in
       the DTT Services Agreement), will be limited to the higher of the total
       Charges (as defined in the DTT Services Agreement) payable by the BBC to
       Tx Co in that year or the amount received by Tx Co in respect of and to
       the extent attributable to any such loss pursuant to any insurance policy
       maintained by Tx Co, whether such claim arises in contract, tort,
       negligence, breach of statutory duty or otherwise.

15.15  Tx Co shall not be liable, whether in contract, tort, negligence, breach
       of statutory duty or otherwise, to the BBC for loss of profits or for any
       indirect, special, incidental or consequential loss whatsoever whether
       incurred by the BBC or a third party arising out of its performance of or
       failure to perform any of its obligations under the Contracts or
       otherwise.

15.16  For the avoidance of doubt, Tx Co is liable to pay to the BBC any
       liquidated damages and/or Service Credits (as defined in the DTT Services
       Agreement) payable in accordance with the Contracts.

15.17  The Contracts set out the full extent of each party's obligations and
       liabilities relating to the DTT Services whether in contract, tort,
       negligence, breach of statutory duty or otherwise. In particular, there
       are no conditions, warranties or other terms, express or implied, as to
       satisfactory quality, fitness for purpose or of any other kind whatsoever
       which are binding on Tx Co except as specifically set out in the
       Contracts. Any other condition, warranty or other term relating to the
       provision of the DTT Services or the sale of Tx Co's Equipment which
       might otherwise have been implied into the Contracts by statute, common
       law or otherwise is hereby excluded.

16     VARIATION AND/OR TERMINATION

       BY EITHER PARTY:-

16.1   The BBC or Tx Co may determine the Agreement and/or any individual
       Building Schedule by delivery to the other party of a final written
       notice where:

          (i)    there has been a material breach of the Agreement in respect of
                 one or more of the Station(s) by the other party which has not
                 been rectified within 30 days of an initial written notice
                 being received by the defaulting party requiring that party to
                 do so; or

          (ii)   one party has become insolvent, bankrupt, or is in receivership
                 or administration.

16.2   The BBC or Tx Co may terminate the Facilities atone or more of the
       Building(s) by the termination of the provisions of the Agreement insofar
       as they relate to one or more of the Building(s) referred to in the
       relevant Building Schedule(s) or by the termination of the provisions of
       the Agreement in its entirety where either:

                                      14
<PAGE>
 
          (i)    there is an interruption of these Facilities due to an event of
                 Force Majeure which has continued for a period in excess of 3
                 months (and for the avoidance of doubt in such circumstances
                 the BBC shall not be liable for any loss to Tx Co or others
                 claiming through Tx Co as a result of such interruption); or

          (ii)   both Tx Co and the BBC consent to such early termination,

       BY TX CO:-

16.3   Tx Co may terminate the Agreement on serving a valid Termination Notice
       giving not less than six months' prior notice, to expire at any time
       (without reference to the Commencement Date, or the Agreement Date, or
       the Term).

16.4   Where the Agreement incorporates more than one Building Schedule Tx Co
       may modify the Agreement by terminating its requirement for the
       Facilities at one or more of the Building(s) and cancelling the relevant
       Building Schedule(s) from the Agreement on serving on the BBC a valid
       Termination Notice which gives not less than six months' notice to expire
       at any time of its intention to cease using the Facilities at the
       relevant Building(s).

16.5   Tx Co may vary the Agreement at any time during the subsistence of the
       Agreement in accordance with the provisions of General Conditions 16.4
       and 16.7, whereupon the Agreement shall continue in full operation and
       effect as amended/extended.

BY THE BBC:-

16.6   Subject to any Special Conditions the BBC may terminate the Agreement, or
       (where the Agreement incorporates more than one Building Schedule
       terminate or modify the Facilities at one or more of the Building(s):-

           (i)   on serving on Tx Co a valid Termination Notice giving not less
                 than six months' prior written notice where the BBC's ability
                 to continue the Agreement or the provision of the Facilities in
                 respect of the relevant Building is prevented by an event
                 beyond the reasonable control of the BBC (which shall include
                 circumstances where the BBC is unable to renew its rights to
                 occupy any land or buildings comprised in the relevant
                 Building(s) and/or where renewal is only available on
                 unreasonable terms); or

           (ii)  on serving on Tx Co a valid Termination Notice giving not less
                 than twelve months' prior notice where the BBC requires all or
                 any part of the Facilities for the purposes of its undertaking;

           (iii) forthwith, (and without prejudice to any right of action or
                 remedy of the BBC in respect of antecedent breach by Tx Co of
                 any of the obligations imposed on Tx Co under the Agreement),
                 where:

                 (a)  any planning or other consent or licence for Tx Co's
                      Equipment is revoked; or

                 (b)  if Tx Co permits any distress to be levied on Tx Co's
                      Equipment; or

                 (c)  in the case of any payment to be made to the BBC by Tx Co
                      under the Agreement, such payment remains in arrears and
                      unpaid following the Due Date and where the BBC has given
                      written notice to Tx Co that Tx Co's Equipment will be
                      switched off and the Facilities terminated unless the BBC
                      receives the outstanding payment together with interest
                      within 30 days of the date of such written notice and that
                      period of 30 days has expired without payment having been
                      made; 

                                      15
<PAGE>
 
                    then, and in each such case, the BBC may switch off Tx Co's
                    Equipment and determine the facilities at the relevant
                    Building(s) without incurring any liability to Tx Co for the
                    results of such act and Tx Co will indemnify the BBC against
                    any loss or claim it may incur as a result of such action or
                    liability.

       GENERALLY:-

16.7   Any variation to the Agreement (including any additional Tx Co's
       Equipment, variation in the Charges, or the addition or removal of any
       one or more of the Building(s)), shall be recorded by the issue of:

          (i)  In the case of the addition of a Building; by a Supplemental
               Building Schedule signed and dated by the parties and annexed to
               the Agreement;

         (ii)  in the case of the variation of any of the terms in an existing
               Building Schedule; by a replacement Building Schedule signed and
               dated by the parties and annexed to the Agreement together with
               an endorsement an the existing Building Schedule cancelling it
               with effect from the date of the replacement Building Schedule;

         (iii) in the case of the removal of a Building; by service of a valid
               Termination Notice in accordance with the provisions of General
               Conditions 16.4 or 16.6 together with an endorsement on the
               existing Building Schedule cancelling it with effect from the
               date of the expiry of the Termination Notice.

16.8   Following termination of the Agreement by either party or following the
       cancellation of a Building Schedule pursuant to any of the provisions of
       General Condition 16, the Charges in respect of the relevant Building(s)
       shall cease to be payable with effect from the effective termination
       date, but without prejudice to the rights of either party to pursue any
       action or remedy in respect of any antecedent breach by the other of any
       of its obligations under the Agreement (subject to the provisions of
       General Condition 15); and without prejudice to the rights of the BBC to
       recover any Charges or other sums payable under the Agreement properly
       due and outstanding prior to the date of such termination.

16.9   Unless relieved from its obligation by any Special Conditions, Tx Co
       shall within 30 days following the expiration of any valid Termination
       Notice procure the removal by a Permitted Contractor(s) of all Tx Co's
       Equipment from the relevant Building(s) to which such notice relates, and
       make good any damage caused by such removal to the BBC's reasonable
       satisfaction or in default of making good as aforesaid shall pay to the
       BBC on demand the costs properly incurred by the BBC in so removing
       and/or reinstating.

17     FURTHER OBLIGATIONS OF THE BBC

       THE BBC WILL:

17.1   subject to obtaining all necessary planning and other consents, provide
       the Facilities;

17.2   maintain in reasonable repair and condition the exterior and structure of
       any Equipment Housing (for the avoidance of doubt this will not include
       any Tx Co's Equipment comprising moveable equipment cubicles) during the
       Term;

17.3   use all reasonable endeavours, to prevent any equipment located at the
       Building(s) and under the BBC's control from causing any interference to
       Tx Co's Equipment;

17.4   provide invoices in respect of the costs and expenses of any supervision
       or other works performed by the BBC pursuant to the provisions of General
       Conditions 2.2.1, 3, 6.1, 6.3, 7, 9.11, 9.13(iii) and 16.9 (where
       applicable) such costs and expenses to be calculated at a reasonable

                                      16
<PAGE>
 
     daily rate for any day or part of a day's attendance at the relevant
     Building(s); such daily rates to be made available to Tx Co by the BBC on
     request;

     provided (and for the avoidance of doubt) the BBC will not be in breach of
     any of its obligations in this General Condition 17 or elsewhere in the
     Agreement where it is prevented from so doing in consequence of an event of
     Force Majeure.

18   NOTICES

18.1 Notices (including Termination Notices) invoices or other documents
     required or permitted to be given under the Agreement shall be in writing
     and shall be sent to the following addressed:-

     for Tx Co:

     Chief Executive Officer
     Castle Transmission International Ltd
     Warwick Technology Park
     Gallows Hill
     Heathcote Lane
     Warwick
     CV34 6TN

     Fax No: 01926 416006

     for the BBC:

     Director of Policy and Planning
     The British Broadcasting Corporation
     Broadcasting House
     Portland Place
     London W1A 1AA
     Fax No. 0171 436 0393

18.2 Any notice, invoice or other document which may be given by either party
     under the Agreement will be deemed to have been duly given if left or sent
     by post (whether by letter or, where the parties agree in writing, in any
     other form) or facsimile transmission to the address set out above or to
     any other address notified to each other in writing in accordance with this
     General Condition as an address to which notices, invoices and other
     documents may be sent. Any such communication will be deemed to have been
     made to the other party:-

     (a) if sent by hand, when delivered;

     (b) if sent by post; 72 hours after the envelope containing such notice was
         posted; or

     (c) if sent by facsimile, when the transmission of the facsimile is
         confirmed delivered complete (if delivered on a business day) or if not
         at 9:30 a.m. (British Standard Time) on the next business day.

     For the purposes of this General Condition, "business day" means 9:30 a.m.
     to 5:00 p.m. Monday to Friday every week of the year except for English
     public holidays. It is further agreed that notices sent by facsimile will
     also be confirmed by sending a signed copy by post, the copy to be posted
     within 24 hours of sending the facsimile.

                                      17
<PAGE>
 
19   DISPUTES

19.1 Any complaints, disputes or problems (each an "ISSUE") relating to this
     Agreement will be escalated as set out in this Clause 19.

19.2 Any Issue will be referred in the first instance to the BBC Representative
     and either the Project Manager or the Service Manager as appropriate. The
     BBC and Tx Co will procure that their respective representatives discuss in
     good faith any Issue with a view to resolving it. If an Issue is not
     resolved to the satisfaction of either party within 30 days of both parties
     having first become aware of it, then either party may refer it to the
     Service Management Board.

19.3 If an Issue is referred to the Service Management Board, then each party
     must procure that their representatives on the Board discuss the Issue in
     good faith at the next meeting of the Service Management Board with a view
     to resolving it. Either party may convene a meeting of the Service
     Management Board to be held within 14 days of an Issue being referred to
     it. If the Issue is not resolved to the satisfaction of both parties within
     7 days of the meeting of the Service Management Board, then either party
     may require that the Issue is dealt with under Clause 19.4.

19.4 Where an Issue is to be dealt with under this Clause 19.4, the parties will
     ensure that, for the BBC, the Director of Policy and Planning, and for CTI,
     the Chief Operating Officer, will meet together with a view to resolving
     the Issue, The parties will allow 30 days from the date of escalation of
     the matter for such consultation or discussions to take place before
     referring the Issue to adjudication or initiating any arbitration or other
     legal proceedings.

19.5 If an Issue is not resolved pursuant to Clause 19.4 and it relates solely
     to matters of an engineering or technical nature, either party may refer it
     for adjudication to the President for the time being of the Institution of
     Electrical Engineers, or his nominee. The President or his nominee shall
     act as an expert, not an arbitrator. The party referring any Issue for
     adjudication must deliver to the expert and the other party a notice
     setting out the matters in dispute and any relevant supporting evidence.
     The other party shall be entitled to reply to the notice and such evidence,
     delivering such reply to the expert and the party referring the Issue.
     Otherwise, the expert shall be entitled to decide on the procedure he or
     she wishes to adopt. Any determination of the expert must be in writing and
     shall be final and binding on both parties, failing any manifest error on
     the face of the decision. Unless the expert determines otherwise, both
     parties will bear their own costs of the determination and half the costs
     of the expert.

19.6 If an Issue is not resolved pursuant to Clause 19.4 and it does not relate
     solely to matters of an engineering or technical nature, either party may
     refer it to mediation in accordance with the Centre for Dispute Resolution
     procedures then in force. If after 30 days either party believes that
     mediation has not resolved the Issue, then either party may proceed to
     litigation. Unless agreed otherwise, each party will bear its own costs of
     the mediation and half the costs of any third party involved.

19.7 Except where clearly prevented by the nature of the Issue, the parties must
     continue performing their respective obligations under this Agreement while
     any Issue is escalated in accordance with this Clause 19.

20   NON-WAIVER

20.1 The failure of either the BBC or Tx Co to enforce the terms of the
     Agreement will not constitute a waiver and shall not affect the right to
     enforce any terms later.

20.2 The provisions of the Agreement are severable and if for any reason any
     provision should be or become void, unenforceable or invalid, the rest of
     the Agreement will remain in full force and

                                      18
<PAGE>
 
     effect and the parties will seek to agree additional or amended provisions
     to replace the void, unenforceable and invalid provision.

21   CONFIDENTIALITY

21.1 The BBC and Tx Co undertake that while the Agreement is in force they and
     their employees and contractors (including any Permitted Contractor(s))
     shall keep confidential and not disclose to any third party the contents of
     the Agreement or any information which they have received from each other
     or which they have made available verbally or in writing in relation to
     their respective businesses or operations without the written consent of
     the other of the aforegoing, such confidentiality shall include any
     technical, operational or financial information relating to the
     broadcasting business of the BBC or pertaining to any contractual
     relationship between the BBC and Tx Co and/or any third party.

21.2 The obligations set out in General Condition 21.1 shall not apply to
     information which is or has become public knowledge (unless as a
     consequence of a breach of General Condition 21.1) and shall also not apply
     to information either party is required to disclose by order of a court or
     order of a competent authority nor to information disclosed in order to
     maintain any listing on the stock exchange or disclosed pursuant to
     obligations in Tx Co Statutory Licenses.

22   GOVERNING LAW

22.1 The Agreement in so far as it relates to Building(s) in Scotland shall be
     governed and construed in accordance with the law of Scotland and the
     jurisdiction of the Scottish courts shall apply.

22.2 The Agreement in so far as it relates to Building(s) in England and Wales
     (and the Agreement as a whole where it includes one or more Building(s) in
     England and Wales) shall be governed and construed in accordance with
     English law and the jurisdiction of the English courts shall apply.

22.3 The Agreement in so far as it relates to Building(s) in Northern Ireland
     shall be governed and construed in accordance with the law of Northern
     Ireland and the jurisdiction of the Northern Irish courts shall apply.

                                      19
<PAGE>
 
                               BUILDING SCHEDULE

<TABLE>
- -------------------------------------------------------------------------------------------------------------------------
<S>                                                          <C>
1 "TX CO"                                                    Contact and address for Notices:
                                                             Tx Co Representative (referred to as the Tx
Castle Transmission International Limited                    Co Representative in the DTT Services
 whose registered office is at Warwick                       Agreement) see General Condition 18
 Technology Park, Gallows Hill, Heathcote
 Lane, Warwick CV34 6TN
- -------------------------------------------------------------------------------------------------------------------------
2 "BUILDING"                                                 3 "COMMENCEMENT DATE"
 
  
                                                             ------------------------------------------------------------
                                                             4 "TERM"  see Special Condition 11.7
                                                                       below (minimum period is the
                                                                       term of the DTT Services
                                                                       Agreement)
- -------------------------------------------------------------------------------------------------------------------------
5 "CHARGES"                                                      (i)  amount:   (Pounds)l + VAT per annum
                                                                      from:     The Commencement
                                                                                Date
   (a) Licence Fee Charges                                       (ii)     payable: in
                                                                          accordance with the
                                                                          provisions of the DTT
                                                                          Services Agreement
                                                                 (iii)    reviewable: see
                                                                          Special Condition
                                                                          11.5 below
- -------------------------------------------------------------------------------------------------------------------------
   (b) additional Charges (if any) e.g.                          (i)  electricity:    a reasonable sum according to use
                                                                 (ii)                 capital cost: none
                                                                 (iii)                other: none
- -------------------------------------------------------------------------------------------------------------------------
   (c) (i)  common payment date(s) for the Charges:              in accordance with the provisions of Clause 11.1 and 
                                                                 11.2 of the DTT Services Agreement
 
       (ii) common Charges review dates:                         N/A
- -------------------------------------------------------------------------------------------------------------------------
6 "PERMITTED USE":                                               Services under the D17 Services Agreement
                                                                 (including location of equipment provided by
                                                                 BT as the distribution network service
                                                                 provider)
- -------------------------------------------------------------------------------------------------------------------------
7 "ACCESS"                                                       None
 
Special Access provisions (if any)
- -------------------------------------------------------------------------------------------------------------------------
8 "THE BBC REPRESENTATIVE"                                       the BBC Representative named in the DTT
                                                                 Services Agreement
 
  
- -------------------------------------------------------------------------------------------------------------------------
9 "EQUIPMENT HOUSING" (IF ANY) PROVIDED BY THE BBC:
- -------------------------------------------------------------------------------------------------------------------------
10 "TX CO'S EQUIPMENT"
- -------------------------------------------------------------------------------------------------------------------------
</TABLE> 
 
                                      20
<PAGE>
 
- --------------------------------------------------------------------------------
11    "SPECIAL CONDITIONS" (IF ANY)
 
11.1  Subject to the provisions of Special Condition 11.2, the BBC may relocate
      any Tx Co's Equipment at any time to a different location on the Building
      (or to a replacement Building) by serving on Tx Co a Termination Notice
      giving not less than three months' prior notice. The modified Facilities
      will be recorded by the issue of a replacement Building Schedule pursuant
      to General Condition 16.7(ii).

11.2  Relocation of Tx Co's Equipment by the BBC pursuant to Special Condition
      11.1 will be in the BBC's discretion and subject to:-
      
      (a)  prior consultation with Tx Co in accordance with the terms of the DTT
           Services Agreement;

      (b)  no resulting increase in the Charges in consequence;
 
      (c)  no resulting diminution of the Facilities available to Tx Co in
           consequence;

      (d)  any necessary relocation works being performed by the BBC, or its
           contractor and at the BBC's expense.

11.3  Either party may terminate the Agreement, (or where the Agreement
      incorporates more than one Building Schedule terminate the Facilities at a
      Building) where the facilities are no longer required for the purposes of
      the DTT Services, by serving on the other a Termination Notice giving not
      less than three months' prior notice.

11.4  For the purposes of General Condition 16.6(ii) the period of notice
      therein shall be reduced from 12 to 3 months.
      
11.5  For the purposes of General Condition 4.2 reviews shall NOT take place
      during the Term.

11.6  The Permitted Use of Tx Co's Equipment described in Clause 6 shall be
      limited to use for the performances of the DTT Services Agreement and not
      the provision of any other third party service without the express prior
      written consent of the BBC (which without the express prior written
      consent of the BBC (which consent may, in the BBC's absolute discretion,
      be granted subject to the negotiation of any necessary modifications to
      the Agreement (including modifications to the financial terms).
      
11.7  The Agreement will continue in force in relation to the Permitted Use and
      in respect of Tx Co's Equipment described in Clause 6 above, subject to
      General Condition 16, and any of these Special Conditions, until either
      party gives to the other not less than 12 months' prior written notice of
      termination. The Agreement will co-terminate with the DTT Services
      Agreement.
- --------------------------------------------------------------------------------
Signed for the BBC:                    Signed for Tx Co:
- --------------------------------------------------------------------------------
Date of Issue:                         the Agreement Date
- --------------------------------------------------------------------------------
Date of termination:                   by Termination Notice/or where superseded
                                       by a Supplemental Building Schedule
- -------------------------------------------------------------------------------

                                      21
<PAGE>
 
(Note where there is more than one Building or separate Charges or length of
Term required for different places of Tx Co's equipment on the same Building,
then separate Building Schedule sheets should be completed for each Building.)

                                      22
<PAGE>
 
                               TERMINATION NOTICE

THIS TERMINATION NOTICE IS VALIDLY GIVEN WHERE IT IS SERVED PURSUANT TO THE
TERMS OF THE AGREEMENT AND SUBJECT TO THE PROVISIONS CONCERNING TERMINATION
CONTAINED IN THE GENERAL CONDITIONS. SERVICE OF THIS NOTICE DOES NOT AFFECT THE
CONTINUATION OF THE AGREEMENT INSOFAR AS IT RELATES TO ANY OTHER BUILDING(S) NOT
THE SUBJECT OF THIS NOTICE.

- ----------------------------------------------------------------------------
1  Tx Co                                          NAME:
 
                                                  ADDRESS:
 
- ----------------------------------------------------------------------------
2  The Agreement                                  DATE:
- ----------------------------------------------------------------------------
   Notice is served pursuant to the               (i)  GENERAL CONDITION(S):
   General Condition(s) named in this
   Notice and the period of Notice is in          (ii) PERIOD OF NOTICE:
   accordance with those General
   Conditions
- ----------------------------------------------------------------------------
4  This notice relates to either:-
 
   (i)  the Building(s) named in this             (i)  BUILDING NAME;
        Notice;
  
        or                                        

                                                  (ii) THE AGREEMENT (DELETE IF
   (ii) the Agreement (in its entirety)                NOT APPLICABLE)
- ----------------------------------------------------------------------------

- ---------------------------------------------------------------------------
SERVED BY: ___________________________________________________(AUTHORIZED
SIGNATORY
- ---------------------------------------------------------------------------
PRINT NAME OF
SIGNATORY:___________________________________________________________
- ---------------------------------------------------------------------------
DATE OF DESPATCH:
 ________________________________________________________________
- ---------------------------------------------------------------------------

                                      23
<PAGE>
 
                                  SCHEDULE 11


            SECURITY, FIRE PREVENTION AND DISASTER RECOVERY SERVICES


1     PREVENTATIVE MEASURES

1.1   SECURITY

1.1.1 CTI shall provide protection to all equipment and facilities used in the
      provision of the DTT transmission service, including deterrent and
      detection systems to prevent unauthorized entry to Stations and IT systems
      used in delivery of the DTT transmission service. A basic level of
      security protection (to be agreed by the BBC) is to be provided at all
      Stations. Additional measures (for example extra security fencing,
      cameras, external alarms and secure cell (limited access within building)
      facilities) are also to be provided at certain stations. These stations
      and the details of these additional measures are to be agreed between the
      BBC and CTI.

1.2   FIRE PREVENTION

1.2.1 The BBC's DTT building at each Station will be equipped with a fire
      detection alarm system. Each cell within the building which will either
      contain one Multiplex Service or Landlord's Equipment will be given its
      own 'Detection Zone' and this will be signalled back to TOC via an
      Automatic Fault Reporter. Each cell within the building will be built to a
      standard that will give a one hour fire withstand between it and the
      neighbouring cells. Appropriate portable fire extinguishers will be
      located throughout the installation.

2     DISASTER RECOVERY PLAN

2.1   Within six months of contract signature CTI will develop at its cost a
      Disaster Recovery Plan for the DTT Transmission Services to be reviewed
      and agreed with the BBC. This will include development of a "Disasters and
      Emergencies Procedures Manual" together with an appropriate disaster
      recovery test plan. A formal disaster recovery test will be carried out
      and the Disasters and Emergencies Procedures Manual will be updated by CTI
      on an annual basis. The timetable of the disaster recovery tests is to be
      agreed between the BBC and CTI.

2.2   The Disaster Recovery Plan will cover security, fire, mast collapse,
      system management (TOC) failure and the provision of replacement broadcast
      and distribution equipment.

2.3   CTI will ensure that all services covered in this Schedule II will be
      provided for all Stations including those operated by NTL.

3     DISASTER RECOVERY FACILITIES

3.1   DTT EMERGENCY EQUIPMENT

3.1.1 CIT shall provide two new containerised DTT transmission systems, one
      commensurate with the high power transmitters, one commensurate with low
      or medium power transmitters, for each Multiplex that CTI operate.

3.1.2 In the event of fire destroying a mains supply and the transmitter site's
      backup generator simultaneously, a containerised generator will be made
      available by CTI within 24 hours except at Eitshal, Bressay, Keelylang
      Hill and Torosay, where reasonable endeavours will apply.

3.2   LOSS OF COMPLETE TRANSMITTING STATION (EXCLUDING ANTENNA SYSTEM)

3.2.1 CTI shall ensure that an emergency container transmitter will be delivered
      to any Station on the mainland of the UK and Northern Ireland within 24
      hours. CTI shall ensure that full service will be resumed within 48 hours
      of delivery.

                                       1
<PAGE>
 
3.3    MAJOR DAMAGE TO MAST AND/OR ANTENNA SYSTEM

3.3.1  CTI shall ensure that the following items, or similar functional
       equivalents, are held as emergency cover in the event of major damage to
       masts and/or antenna systems:

       .  210m Reserve Mast

       .  80m Reserve Tower

       .  16 Lambda Main UHF Antenna

       .  4 Lambda UHF Antenna

       .  5 inch Feeder

       .  3 inch Feeder

       .  UHF Combiner

       .  Handbooks

3.3.2  A separate digital reserve antenna system will also be provided by CM
       consisting of.

       .  2 Broadband 8 Lambda 4 panel UHF Antennas

       .  2 inch feeder

       .  a modular combiner

3.3.3  The BBC recognise that service recovery times will depend upon the
       severity of damage, and that the erection time for the 210m mast is
       between four and five weeks.

3.4    TECHNICAL OPERATIONS CENTRE (TOC)

3.4.1  CTI shall provide a back-up technical operations centre, remotely located
       from the TOC. Both centres shall have fully duplicated computer systems.
       Data communications from Stations to these computer systems shall have
       reserve (ISDN) facilities which are selected automatically in the case of
       failure of the primary communications link.

3.4.2  In the event that the TOC needs to be abandoned, staff shall transfer to
       the back-up centre and the operation be resumed within one hour with no
       loss of monitoring data.

4      DISASTER RECOVERY PROCEDURES

4.1    GENERAL

4.1.1  In the event of a serious incident CTI shall follow the procedures laid
       down in the Disaster Recovery Plan to be developed and agreed in
       accordance with Section 1 of this Schedule 11. Key requirements of this
       plan are summarised below.

4.2    NOTIFICATION

4.2.1  In the event that a potentially catastrophic incident is detected, which
       will impair or interrupt service from one or more Stations for an
       extended period, CTI shall immediately notify the following BBC contacts
       in the sequence described:
 
       .  Presentation Engineering Co-ordinator        (24 hours a day)
       .  BBC Representative                           (24 hours a day)
       .  Engineering Information Department        (Office Hours only)

4.2.2  CTI and the BBC Representative will jointly assess the implications of
       the incident and will follow the agreed Disaster Recovery Plan.

4.3    SERVICE PRIORITY

4.3.1  In the event of failure of more than one service at a Station, the order
       of priority for service restoration will be in accordance with the
       Disaster Recovery Plan.

                                       2
<PAGE>
 
4.3.2  A summary of the proposed restoration sequence to be contained in the
       Disaster Recovery Plan, subject to agreement with the D-Mux group is set
       out in the table below:

       ------------------------------------------------------------------------
       SERVICE             DATE                      RESTORATION SEQUENCE
       AFFECTED
       ------------------------------------------------------------------------
       DTT Only          Any time            Multiplexes in descending order of
                                             population served
       ------------------------------------------------------------------------
       Analogue and    Early years      Analogue in accordance with Analogue 
       DTT                              Contract DTT multiplexes in descending
                                        order of population served

                       Later years*     DTT multiplexes in descending order of
                                        population served

                                        Analogue in accordance with Analogue 
                                        Contract
       ------------------------------------------------------------------------
       * The changeover date will be selected by the BBC, and will be influenced
         by DTT take-up. 

                                       3
<PAGE>
 
                                  SCHEDULE 12

                            TECHNICAL ARCHITECTURE

[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       1
<PAGE>

[*] 

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       2
<PAGE>

[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       3
<PAGE>

[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       4
<PAGE>

[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       5
<PAGE>

[*] 

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       6

<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       7
<PAGE>

[*]

12.8      ON-LINE STATUS INFORMATION TO BBC

[*]

12.8.2    The proposed system is shown below:-

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       8
<PAGE>
 
[Diagram illustrating the system by which CTI will provide the BBC with online
status information]


2.8.3     A dedicated database will be provided to hold a subset of the alarms
          and current status of all the DTT Stations. This database will be kept
          to within one minute of the status that is known at the TOC system.

12.8.4    A Windows application will be supplied to access the database and
          provide a graphical overview of the entire network, as well as showing
          more detail on individual Stations when required. It will be possible
          to do ad-hoc reports on this database.

12.8.5    CTI will provide suitable systems to protect the networks of both CTI
          and the BBC. This will include firewalls on the telecommunications
          links and virus checking on the BBC Network Status system computer.

12.8.6    The BBC will use reasonable endeavours to ensure that the systems
          located on its premises are physically secure, and to protect them
          against local attack or unauthorised use.

12.8.7    The data circuit, PC (for use at the BBC centre), database and Windows
          application will form part of the Transmission Service and will be the
          responsibility of CTI. The monitoring of this circuit and PC will be
          incorporated into CTI's existing Network Management system.

12.8.8    Further details of the functionality of the on-line system are
          provided in Schedule 8.

                                       9
<PAGE>

[*]
 
[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      10

<PAGE>

                                      [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      11
<PAGE>
 
                                      [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      12
<PAGE>
 
                                      [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      13
<PAGE>

                                      [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      14
<PAGE>

[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.
 
                                      15

<PAGE>
 
                                  SCHEDULE 13

                                  References

                          [Table listing references]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       1

<PAGE>

                                                                   EXHIBIT 10.34



                            DATED 18 December 1997


                        ______________________________



                     (1) BRITISH DIGITAL BROADCASTING PLC


                                      and


                   (2) CASTLE TRANSMISSION INTERNATIONAL LTD


                        ______________________________

                                   AGREEMENT

                             FOR THE PROVISION OF

                  DIGITAL TERRESTRIAL TELEVISION DISTRIBUTION

                           AND TRANSMISSION SERVICES

                        ______________________________





                                CLIFFORD CHANCE

<PAGE>



                               TABLE OF CONTENTS

<TABLE> 
<S> <C>
1.  DEFINITIONS AND INTERPRETATION........................................
2.  THE SERVICES..........................................................
3.  OWNERSHIP OF THE NETWORK AND SCOPE OF THIS AGREEMENT..................
4.  ROLL-OUT OF THE STATIONS AND DISTRIBUTION NETWORK.....................
5.  TESTING...............................................................
6.  CONSEQUENCES OF FAILURE TO ACHIEVE READY FOR SERVICE DATES............
7.  MODIFICATIONS TO EXISTING ANALOGUE TRANSMISSION SYSTEMS...............
8.  SECURITY AND SITES....................................................
9.  INDUSTRY LIAISON AND SPECTRUM MANAGEMENT..............................
10. LICENSES..............................................................
11. BDB SIGNALS...........................................................
12. EQUIPMENT LOCATED AT BDB PREMISES.....................................
13. CONTRACT MANAGEMENT, REVIEW OF SERVICES AND DISPUTES..................
14. PERFORMANCE MONITORING AND REPORTING..................................
15. MAINTENANCE...........................................................
16. CHANGE CONTROL........................................................
17. CHARGES, SAVINGS, PAYMENT AND BILLING.................................
18. TERM, TERMINATION AND SUSPENSION......................................
19. WARRANTIES............................................................
20. FORCE MAJEURE.........................................................
21. LIABILITY AND INSURANCE...............................................
22. ASSIGNMENT AND SUB-CONTRACTING........................................
</TABLE> 

                                       2
<PAGE>

<TABLE> 
<S> <C> 
23. INFORMATION AND CONFIDENTIALITY...................................
24. NOTICES...........................................................
25. [*]...............................................................
26. RESTRICTIVE TRADE PRACTICES.......................................
27. GENERAL...........................................................
28. VALUE ADDED TAX...................................................
29. JURISDICTION......................................................
30. COUNTERPARTS......................................................

SCHEDULE 1..................................................................
CHANGE CONTROL PROCEDURE....................................................
SCHEDULE 2..................................................................
THE CHARGES.................................................................
SCHEDULE 3 CONFIGURATION OF THE NETWORK.....................................
SCHEDULE 4..................................................................
SERVICES PROVIDED BY CTI....................................................
SCHEDULE 5..................................................................
TRANSMISSION TESTING........................................................
SCHEDULE 6..................................................................
THE BDB INTERFACE AND HANDOVER REQUIREMENTS.................................
SCHEDULE 7..................................................................
CALCULATION OF DELAY REBATES AND SERVICE CREDITS............................
SCHEDULE 8..................................................................
STATIONS....................................................................
SCHEDULE 9..................................................................
THE IMPACT SCHEDULE (BDB DTT ANALOGUE CONSEQUENTIALS).......................
________________________________________________________________________________
</TABLE> 

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       3

<PAGE>


SCHEDULE 9 - TABLE 1..........................................................
SCHEDULE 10...................................................................
[*]...........................................................................
SCHEDULE 11 - EMERGENCY EQUIPMENT/DISASTER RECOVERY PROCEDURES................
SCHEDULE 12...................................................................
ADDITIONAL STATIONS...........................................................
ANNEX 1.......................................................................
THE SATELLITE DISTRIBUTION NETWORK............................................
ANNEX 1 - PART 1..............................................................
SUBSTITUTE SCHEDULE 2.........................................................
ANNEX 1 - PART II.............................................................
SUBSTITUTE SCHEDULE 3 - PART I................................................
ANNEX 1 - PART III............................................................
SUBSTITUTE SCHEDULE 6 - PART I................................................
ANNEX 1 - PART IV.............................................................
SUBSTITUTE SCHEDULE 11........................................................
ANNEX 2.......................................................................

________________________________________________________________________________

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                       4

<PAGE>
 
THIS AGREEMENT is made on 18 December 1997 between:

(1)  BRITISH DIGITAL BROADCASTING PLC (No. 3302715) (a company incorporated
     under the laws of England and Wales) whose registered office is at 25
     Knightsbridge, London, SW1X 7RZ ("BDB"); and

(2)  CASTLE TRANSMISSION INTERNATIONAL LTD (No. 3196207) (a company incorporated
     under the laws of England and Wales) whose registered office is at Warwick
     Technology Park, Gallows Hills, Heathcote Lane, Warwick CV34 6TN ("CTI").

WHEREAS:

(A)  BDB intends to provide multiplex services over the frequencies allocated to
     BDB by the ITC in relation to digital terrestrial television services,
     ancillary services and additional services; and

(B)  This Agreement sets out the terms and conditions on which CTI has agreed to
     provide, amongst other things, distribution and transmission services to
     BDB in relation to the BDB Multiplexes and to procure, construct, operate,
     maintain and provide the necessary network for the provision of those
     services.

IT IS HEREBY AGREED as follows:

1.   DEFINITIONS AND INTERPRETATION

1.1  In this Agreement:
 
     "ACCOUNTABLE AVAILABILITY" has the meaning set out in Schedule 7;

     "ACCEPTANCE TEST SPECIFICATIONS" means the tests to be performed by CTI (as
     described in Clause 5) in order to determine whether the Network and any
     particular Station are ready for Operational Service as set out in Part I
     of Schedule 5;

     "ACTUAL SITE SERVICE DATE" means, in respect of each Station, the date on
     which the Station is brought into Operational Service;

     "ADDITIONAL STATIONS" means any Stations not listed in Schedule 8 which the
     parties agree to incorporate into this Agreement in respect of which CTI
     shall provide Services:

     "ADVANCE PAYMENT" shall have the meaning ascribed to it in the Pre-Contract
     Funding Agreement;

     "ADVANCE WORKS" shall have the meaning ascribed to it in the Pre-Contract
     Funding Agreement;

                                       5
<PAGE>
 
     "AGREED IMPACT SCHEDULE" means the document summarizing the modifications
     to be performed by CTI to existing analogue transmission systems
     (including, but not limited to, certain of those changes identified in the
     ITC Code of Practice on Changes to Existing Transmission and Reception
     Arrangements) in Schedule 9;

     "AGREED PROPORTION" means [*];

     "AMENDED SITE SERVICE DATE" means, in respect of each Station, the amended
     date on which the Station is to be brought into Operational Service where
     the Initial Site Service Date has been amended pursuant to the terms of
     this Agreement;

     "AVAILABILITY" means the period of time during which the DTT Transmission
     Services and Distribution Services are to be available in respect of a
     particular BDB Multiplex from a particular transmitter in accordance with
     the terms and to the standards required under this Agreement (including,
     without limitation, the Technical Specification);

     "1990 ACT" means the Broadcasting Act 1990 (as amended by the 1996 Act);

     "1996 ACT" means the Broadcasting Act 1996;

     "BDB INTERFACE" means an interface point from the output of the equipment
     providing transport streams for each of the BDB Multiplexes at BDB's
     multiplex centre to the Distribution Network as more particularly described
     in Schedule 6;

     "BDB MULTIPLEXES" means the multiplex services known as Multiplexes B, C
     and D for digital terrestrial television, provision of which by BDB is
     licensed by the ITC under the Multiplex Licences;

     "BDB REPRESENTATIVE" means the person notified from time to time by BDB to
     CTI for the purposes of Clauses 14 and 15, and Schedule 2;

     "BDB SIGNALS" means the digital transport stream originated by BDB from the
     BDB Interface as described in Schedule 6 carrying, amongst other things,
     the digital programme services, ancillary services and digital additional
     services broadcast as part of the services licensed under the Multiplex
     Licences from time to time (for the purpose of this definition, the terms
     digital programme service, ancillary service and digital additional service
     shall have the meanings ascribed to them in Part I of the 1996 Act);

     "BUSINESS DAY" means a day on which banks are generally open for business
     in the City of London, Saturdays and Sundays excluded;

     "CHANGE CONTROL PROCEDURE" means the procedure set out in Schedule 1;

     "CHARGES" means charges payable by BDB for the Services calculated in
     accordance with Schedule 2;

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                       6
<PAGE>
 
     "COMMENCEMENT DATE" shall, in respect of each of the Multiplexes, have the
     meaning ascribed to it in the relevant Multiplex Licence;

     "CONTINGENCY AMOUNT" means the contingency amount included in the Charges
     as set out in Part IV of Schedule 2;

     "CONTRACTED AVAILABILITY" means in relation to each BDB Multiplex the end
     to end Accountable Availability, from the BDB Interface to the output of
     each Station, which CTI is contracted to provide in relation to the
     Services pursuant to Clause 2 and Schedule 7;

     "DELAY REBATE" means the rebate on the Charges to be given by CTI to BDB in
     respect of any failure by CTI to meet the relevant Ready for Service Date
     in respect of any Station, being described in and calculated in accordance
     with Schedule 7;

     "DESIGN AND OPTIMISATION CONSULTING SERVICES" means technical advice and
     consultation, prior to the Start of Service Date for the Phase I Stations,
     provided in order to optimise the coverage and capability of the
     Transmission Network, including SI Interface design and the enhancement of
     antenna patterns;

     "DISASTER RECOVERY SYSTEMS" means the disaster recovery systems and
     procedures to be established by CTI pursuant to Clause 14 as more
     particularly described in Part II of Schedule 11;

     "DISTRIBUTION NETWORK" means the network to be used by CTI to distribute
     the BDB Signals from the BDB Interface to the Stations, details of which
     are set out in Part I of Schedule 3;

     "DISTRIBUTION SERVICES" means the distribution by CTI of the BDB Signals
     from the BDB Interface to the Stations via the Distribution Network
     pursuant to this Agreement;

     "DTT TRANSMISSION SERVICES" means the transmission services to be provided
     by CTI to BDB in accordance with the Technical Specification at each
     Station pursuant to this Agreement;

     "EMERGENCY POWERS" means a power exercisable by a Minister of the Crown
     pursuant to any legislation enacted or made to deal with a public
     emergency, including the Emergency Powers Act 1920 and any regulation made
     under it;

     "EMERGENCY RESERVE EQUIPMENT" means the equipment more particularly
     described in Part I of Schedule 11;

     "EQUIPMENT" means the equipment used by CTI in the provision of the
     Services;

     "ERP" means the effective radiated power to be transmitted for a BDB
     Multiplex at each Station as set out in Schedule 8;

                                       7
<PAGE>
 
     "EXCLUSIVE EQUIPMENT" means the transmitters, transmitter input equipment
     and TVROs at Stations used solely for the provision of the Services;

     "FAULT REPORT" means a report relating to any Transmission Fault given by
     CTI to BDB pursuant to Clause 14.3;

     "FIBRE DISTRIBUTION NETWORK" means the fibre distribution network details
     of which are set out in Schedule 3;

     "FORCE MAJEURE EVENT" means any events or circumstances beyond the control
     of either party (which shall include but not be limited to Act of God, war,
     civil disturbance, statutory prohibition, Government intervention, order or
     act of Government or local/public authority, act or omission of any
     relevant licensing or other regulatory authority not caused by the party,
     act or threat of terrorism, fire, lightning, flood, other extreme weather
     conditions which cause physical damage to property used to supply the
     Services or prevent access to or safe working on any such property,
     explosion, theft or vandalism (subject in either case to compliance by CTI
     with Clause 8), lawful national strike action or lawful industrial action
     taken by members of a union (other than industrial action taken by the
     party's own employees or employees of its sub-contractors)) but excluding
     the consequences of any act or omission of any of the party's sub-
     contractors unless that act or omission is itself the result of a Force
     Majeure Event;

     "GROUP" means in relation to any company, that company and any company
     which is a holding company or subsidiary of that company and any subsidiary
     of any such holding company; and for the purposes of this Agreement
     "subsidiary" and "holding company" have the meanings ascribed thereto by
     Sections 736 and 736A Companies Act 1985;

     "HANDOVER REQUIREMENTS" means the requirements in relation to the BDB
     Signals set out in Schedule 6;

     "INITIAL SITE SERVICE DATE" means, in respect of each Station, the initial
     date on which CTI agrees to bring the Station into Operational Service as
     set out in Clause 4.2 or in respect of Additional Stations, such date as
     maybe agreed between the parties;

     "ITC" means the Independent Television Commission established by the 1990
     Act and any successor body to the functions of the ITC in relation to the
     BDB Multiplexes;

     "MULTIPLEX CENTRE" means the location of the BDB Interface;

     "MULTIPLEX LICENCES" means the licences to provide multiplex services
     granted to BDB by the ITC under Part I of the 1996 Act for the provision of
     multiplex services as defined in Section 1(1) of the 1996 Act and any
     licences replacing the same.  The current draft of the Multiplex Licence
     (minus condition 10 and Part I of the annex to

                                       8
<PAGE>
 
     the draft Multiple Licence and all documents and correspondence referred to
     in that annex) as at the date of this Agreement is set out in Annex 2;

     "NETWORK" means the network of facilities and equipment used to provide the
     Services to BDB (including, without limitation, the Distribution Network
     and the Transmission Network) which is owned or procured by CTI and the
     configuration of which is more particularly described in Schedule 3;

     "NETWORK STATUS SYSTEM" means the system to be installed by CTI pursuant to
     Clause 14.1 as more particularly described in Part III A of Schedule 3;

     "NON-ACCOUNTABLE CONDITION" shall have the meaning ascribed to it in
     Schedule 7;

     "NTL" means National Transcommunications Limited (company number 2487597) a
     company registered in England and Wales, or any successor to the ownership
     of the digital terrestrial television transmission network operated by NTL;

     "OPERATIONAL SERVICE" means, in respect of the Network and, without
     limitation, each Station the ability of CTI to provide the Services and of
     the Network (including, but not limited to, each Station) to perform in
     accordance with this Agreement (including, but not limited to, the
     Technical Specification);

     "PHASE I, PHASE II AND PHASE III STATIONS" means the stations specified as
     such in Part IV of the annex to the Multiplex Licences;

     "PRE-CONTRACT FUNDING AGREEMENT" means the pre-contract funding agreement
     between the parties of even date herewith;

     "RADIOCOMMUNICATIONS AGENCY" means the executive agency forming part of the
     Department of Trade and Industry responsible for issuing and administering
     licences under the WTA and any successor body responsible for those
     functions;

     "RADIO-REGULATIONS" means the Radio Regulations of the International
     Telecommunications Union or any replacement for such regulations and
     includes all related regional agreements;

     "READY FOR SERVICE DATE" means, in respect of each Station, the date on
     which CTI agrees to bring the Station into Operational Service being either
     the Initial Site Service Date or the Amended Site Service Date determined
     in accordance with the provisions of Clause 4;

     "RECEPTION SURVEY" means the survey of the coverage achieved from each
     Station to be conducted by CTI pursuant to Clause 14. 10 as more
     particularly set out in Part IV of Schedule 4;

     "RESPONSE TIMES" shall have the meaning set out in Clause 14.4 and Schedule
     8;

                                       9
<PAGE>
 
     "RPI" means the general index of retail prices (all items) as published in
     the monthly Digest of Statistics by the UK Central Statistical Office, as
     amended from time to time, or, if that index is no longer published, any
     equivalent replacement of the same agreed by the parties or, where they
     fail to agree, selected by an independent expert appointed by the President
     of the Institute of Chartered Accountants in England and Wales;

     "SATELLITE DISTRIBUTION NETWORK" means the satellite distribution network
     details of which are set out in Annex 1;

     "SERVICES" means the Distribution Services, the DTT Transmission Services,
     the SI Collation Services, the Design and Optimisation Consulting Services
     and such other services as are to be provided by CTI to BDB pursuant to
     this Agreement;

     "SERVICE CREDITS" means credits against Charges in respect of CTI failing
     to meet the Contracted Availability calculated in accordance with Schedule
     7;

     "SERVICE MANAGEMENT BOARD" means the committee to be established by the
     parties pursuant to Clause 13.2;

     "SHARED EQUIPMENT" means Equipment forming part of the Network which is not
     exclusively dedicated to the provision of the Services to BDB;

     "SI" means service information as defined in the European Telecommunication
     Standard pr ETS 300 468;

     "SI COLLATION SERVICES" means collation of SI from all other multiplexes
     used for digital terrestrial television transmission, to the extent there
     is any, into each of the BDB Multiplexes as more fully described in Part
     I.A. of Schedule 3;

     "SITE" means the site at which any Station is located;

     "SITE OWNER" means in respect of any Site any party with a freehold or
     leasehold interest in or a licence to occupy that Site;

     "START OF SERVICE DATE" means the date identified in the Multiplex Licences
     for each Station as the date upon which broadcasts of the Licensed Service
     must commence from that Station;

     "STATIONS" means the transmitting stations at the sites listed in Schedule
     8, as amended from time to time pursuant to this Agreement, and any
     Additional Stations;

     "TA LICENCES" means any licences required by CTI under the Telecoms Act to
     provide the Services;

     "TARGET SITE SERVICE DATE" means the target date for bringing each Station
     into Operational Service as set out in Schedule 8, Table 1;

                                       10
<PAGE>
 
     "TECHNICAL SPECIFICATION" means the provisions of this Agreement relating
     to the technical performance of the Network and the Services, as set out in
     Schedule 5;

     "TELECOMS ACT" means, in relation to the UK, the Telecommunications Act
     1984. or such equivalent statutes as are from time to time in force in the
     Channel Islands or the Isle of Man as the case may be;

     "TEMPLATES" means in relation to each Station, the transmitter horizontal
     radiation pattern templates for that Station (as the same are defined in
     the station design proposals (known as the Digital Television Planning
     Group Notes) issued or to be issued by the ITC);

     "TERM" means the period commencing on the date hereof and ending on the
     date which is 12 years from the Commencement Date of the list of the
     Multiplex Licences:

     "TEST TRANSMISSIONS" means the test transmissions to be made from each
     Station pursuant to Clause 5.6, as more particularly detailed in Part IV of
     Schedule 4;

     "THIRD PARTY SITE" means any Site in respect of which a third party
     (including, without limitation, NTL) is the Site Owner;

     "TOC" means CTI's technical operations centre currently located at Warwick;

     "TRANSMISSION FAULTS" means any break, interruption, discontinuance,
     degradation or other impairment of the transmission of the BDB Signals
     resulting in performance outside the Transmission Fault Thresholds
     specified in the Technical Specification,

     "TRANSMISSION FAULT THRESHOLDS" means the transmission fault thresholds set
     out in Part II of Schedule 5:

     "TRANSMISSION HOURS" means 24 hours a day or such other times, in respect
     of each of the BDB Multiplexes, during which BDB wishes to transmit BDB
     Signals from that BDB Multiplex;

     "TRANSMISSION NETWORK" means the network to be used by CTI to provide the
     DTT Transmission Services, details of which are set out in Part II of
     Schedule 3:

     "TRANSMISSION TESTING" means the carrying out of tests to determine whether
     the Network or any particular Station satisfy the Acceptance Test
     Specifications pursuant to Clause 5.1 as more particularly described in
     Schedule 5;

     "VAT" means value added tax as currently charged under the Value Added Tax
     Act 1994 and any successor or replacement thereof and any similar tax
     chargeable under the laws of the United Kingdom;

     "WTA" means the Wireless Telegraphy Acts 1948-1967, or such equivalent
     statutes as are from time to time in force in any of the United Kingdom,
     the Channel Islands or the Isle of Man;

                                       11
<PAGE>
 
     "WTA LICENCES" means any licences required by CTI to perform the Services
     pursuant to the WTA;

     "YEAR" means the period from the date of execution of this Agreement to the
     31 December 1997 (which constitutes the first Year), and each subsequent
     complete period of twelve months from 1 January to 31 December save for the
     last Year which shall start from 1 January to the last day of the Term
     inclusive;

1.2  "The expressions "BDB" AND "CTI" include their respective permitted
     subcontractors, assigns, employees and agents.

1.3  Any references to any Act of Parliament will be deemed to include any
     replacement or re-enactment for the time being in force and to include any
     by-laws, statutory instruments, licences, rules, regulations, orders,
     notices, directions, consents or permissions made under such Act and any
     condition attaching thereto and any reference to any governmental or
     regulatory body shall include a reference to its successors.

1.4  The headings in this Agreement are for ease of reference only and will not
     be taken into account in the construction or interpretation of any
     provision to which they refer.

1.5  Any reference to a clause, schedule or annex, unless the context otherwise
     requires, is a reference to a clause of or schedule or annex to this
     Agreement.

2.   THE SERVICES

2.1  This Agreement is conditional on the satisfaction of the condition
     precedent that all three Multiplex Licences shall have been granted to BDB
     In substantially the form set out in Annex 2. This Agreement shall come
     into full force and effect on the date on which the condition in this
     Clause 2.1 shall have been satisfied.  In the event that the condition
     precedent set out in this Clause 2.1 shall not have been satisfied by 31
     March 1998 or such later date as the parties may agree, then this Agreement
     shall be void and of no affect.

2.2  CTI shall provide or procure the provision of the Distribution Services
     using the Distribution Network on and subject to the terms of this
     Agreement.

2.3  From such date as BDB may reasonably request (no later than the Start of
     Service Date of the first Station to be rolled out) to the extent
     practicable, and throughout the remainder of the Term, CTI shall provide
     the SI Collation Services on the terms of this Agreement.

2.4  CTI shall, in relation to each Station, provide the DTT Transmission
     Service to BDB from the Ready for Service Date and throughout the remainder
     of the Term using the Network on the terms of this Agreement.

                                       12
<PAGE>
 
2.5  CTI shall provide the Services in compliance with and will ensure that the
     Network (including, but not limited to, the Distribution Network, the
     Transmission Network and any Equipment or Stations comprised in the
     Network) complies with:

     2.5.1  the provisions of this Agreement;

     2.5.2  the Technical Specification;

     2.5.3  the ITC Technical Performance Code and Condition 6(4) of the
            Multiplex Licences all as they exist as at the date of this
            Agreement; and

     2.5.4  the WTA Licences, TA Licences, and any other law or legally binding
            regulation in the UK or elsewhere from time to time applicable to
            CTI, this Agreement or the subject matter thereof.

     In the event of any conflict between any of the above, CTI shall comply
     with BDB's reasonable instructions as to which shall take priority, save to
     the extent that doing so would be unlawful.

2.6  Without prejudice to Clause 7.3 in the event of any variation from time to
     time of the provisions of the ITC Technical Performance Code, or the
     technical distribution and transmission requirements of the Multiplex
     Licences, ("Variation"), CTI shall provide the Services (subject to its
     ability to obtain third party consents which CTI shall use its best
     endeavors to obtain) in compliance therewith provided that the effect on
     the Services of compliance with the Variation shall be considered by the
     parties through the Change Control Procedure and BDB shall be responsible
     (to the extent that there is any cost and that such cost is necessarily
     incurred) for the material cost of implementing such Variation and any
     material increase in CTI's costs of providing the Services as changed to
     comply with the Variation provided further that BDB shall not be charged
     more than its appropriate share of such costs.

2.7  If the ITC specifies a particular European Community digital standard to be
     met in accordance with Section 142(3) of the 1996 Act, CTI shall (subject
     to its ability to obtain third party consents which CTI shall use its beat
     endeavours to obtain) employ a transmission system in compliance with that
     European Community digital standard within the time periods required by the
     ITC provided that any changes to the Technical Specification and/or the
     Services in consequence shall be authorised by BDB in accordance with the
     Change Control Procedure and if the implementation of material changes
     causes CTI necessarily to incur a material increase in costs, said material
     increase in costs shall be met by BDB, provided further that BDB shall not
     be charged more than its appropriate share of such costs.

2.8  If, during the continuance of this Agreement there should come into force a
     change in law or legally binding regulation applicable to this Agreement or
     the subject matter hereof, which necessitates (in order for CTI to comply
     with Clause 2.5.4) a change in the Services and/or increases in CTI's costs
     of providing the Services the parties shall consider such change in the
     Services or increase in costs pursuant to the Change

                                       13
<PAGE>
 
      Control Procedure. BDB and CTI agree that BDB shall be responsible (to the
      extent there is any and it is necessarily incurred) for any increase in
      the material costs incurred by CTI of implementing or providing the
      Service in compliance with such change in law or legally binding
      regulation to the extent that such change in law or legally binding
      regulation is only applicable to the Services or is applicable to digital
      terrestrial television generally in which case BDB shall not be charged
      more than its appropriate share.

2.9   CIT shall, in relation to each BDB Multiplex provide the Services with a
      minimum end to end Accountable Availability from the BDB Interface to the
      output of each station of 99.9% except for those Stations identified in
      Schedule 7 Part III in respect of which the end to end Accountable
      Availability from the BDB Interface to the output of each Station will be
      a minimum of 99.8%. Such end to end Accountable Availability to be
      calculated as set out in Schedule 7.

2.10  CTI undertakes that it will use the skill and care of a diligent provider
      of distribution and transmission services in the provision of the
      Services, and discharge its obligations under this Agreement in accordance
      with best practice in the broadcasting industry.

2.11  CTI shall ensure that:

      2.11.1  no change of, reference to or use of a date later than 31 December
              1998 in the operation of the Network or the Network Status System
              will have an adverse effect on, or cause Services to cease to meet
              the Technical Specification; and

      2.11.2  without prejudice to the generality of Clause 2.11.1 above, the
              Network and the Network Status System will, in responding to two-
              digit date input and providing date output, resolve any ambiguity
              as to century in a manner which is consistent, clearly defined and
              apparent to the user.

2.12  CTI shall ensure that each Station satisfies the minimum level ERP (as
      specified in the Template) for each of Multiplexes B, C and D and will use
      all reasonable endeavors to maximise ERP at each Station within the
      maximum constraints specified in the Templates for each Station. CM shall
      demonstrate compliance with these obligations by the relevant transmission
      testing procedures described in Schedule 5 and Schedule 4 Part IV.

2.13  In the event that the population coverage predicted by the ITC for a
      Template is not reached ("COVERAGE LOWS") despite CTI's compliance with
      Clause 2.12, CTI will use all reasonable endeavours to overcome the
      Coverage Loss with practical solutions (to be considered through the
      Change Control Procedure) and will provide all reasonable assistance to
      BDB in any consequential discussions with the ITC. If such Coverage Loss
      is due to failure of CTI to comply with Clause 2.12, CTI will be
      responsible for any costs and expenditure incurred in correcting such
      failure and providing assistance

                                       14
<PAGE>
 
      to BDB. In all other circumstances where BDB wish to have such corrective
      works performed, the additional expenditure required will be met by BDB.

      Use of Fibre Distribution Network

2.14  The Charges are based on the use by CTI of the Fibre Distribution Network.
      British Telecommunications Plc ("BT") has offered to provide CTI with
      fibre distribution services which will enable CTI to provide the
      Distribution Services using the Fibre Distribution Network.

2.15  The price at which CTI has been offered fibre distribution services by BT
      and therefore the charges set out in Part 1 of Schedule 2 are based on a
      new tariff for a bespoke distribution network which can only be made
      available if taken up by the operators of a minimum number of digital
      terrestrial television multiplexes and CTI Is waiting confirmation from BT
      that it can make the fibre distribution services available to CTI on the
      basis of the tariff. However, CTI agrees to use all reasonable endeavors
      to procure the availability of the Fibre Distribution Network as
      contemplated in this Agreement.

2.16  If, during the first six months from the date hereof, the price at which
      CTI is supplied by BT with the Fibre Distribution Network is materially
      increased or the Fibre Distribution Network is no longer available either
      because the operators of the multiplex used to transmit the digital
      services of Channel 3 and Channel 4 or the BBC elect not to use the
      bespoke distribution network contemplated in Clause 2.15 or as a result of
      a regulatory intervention by, or other requirements of, the Director
      General of Telecommunications, the Change Control Procedure shall be
      invoked to discuss the implications of the intervention or other
      requirements and, if BDB elects to continue with the Fibre Distribution
      Network, BDB acknowledges that the Charges will be amended accordingly
      (provided that CTI shall use all reasonable endeavors to reduce the amount
      of any increase and shall follow all reasonable instructions of BDB
      relating to the use of an alternative distribution system) and that in the
      absence of such amendment CTI shall not be obliged to provide the Fibre
      Distribution Network.

2.17  If, during the first six months from the date hereof, BT is unable to make
      the fibre distribution services available to CTI as contemplated in Clause
      2.14 and 2.15 and CTI can therefore cannot commit to providing the Fibre
      Distribution Network. BDB shall have the option to require CTI to
      substitute the Satellite Distribution Network on the basis set out in
      Annex 1 (the provisions of which shall be substituted for the equivalent
      provisions of Schedules 2, 3, 6 and 11) and the Satellite Distribution
      Network shall become the Distribution Network for the purposes of this
      Agreement.

3.    OWNERSHIP OF THE NETWORK AND SCOPE OF THIS AGREEMENT

3.1   The Network shall be procured and/or constructed, operated and maintained
      by CTI to provide, inter alia, the Services to BDB.

                                       15
<PAGE>
 
3.2   Subject to the provisions of Clause 3.3 all equipment and services
      required by CTI to provide the Services (including but not limited to the
      Sites, buildings, plant, the Distribution Network and the Transmission
      Network) will be acquired, obtained or procured by CTI at its own cost.

3.3   [*].

3.4   The parties will ensure their financial advisers co-operate to seek an
      early resolution to the manner in which the arrangements contemplated in
      Clause 3.3 are best achieved.

3.5   Subject to Clauses 3.3 and 18.11, as between CTI and BDB, BDB shall have
      no ownership of any part of the Network.

3.6   This Agreement relates, inter alia, to the rollout of the 81 Stations
      specified in Schedule 8. If, without hereby creating any binding
      obligation, the parties agree to include any Additional Stations in the
      Network the terms on which such Additional Stations shall be provided,
      including the order and speed of the rollout of the Subsequent Stations
      shall be agreed in accordance with the Change Control Procedure save that
      the Charges attributable to such Additional Stations shall be calculated
      in accordance with the provisions of Schedule 12.

3.7   The Exclusive Equipment shall not be used by CTI to provide services to
      itself or to any third party without the prior written consent of BDB.

4.    ROLL-OUT OF THE STATIONS AND DISTRIBUTION NETWORK

4.1   CTI will construct and/or procure the construction of the Transmission
      Network in accordance with best industry practice in the broadcasting
      industry.

4.2   ITC shall bring each of the Stations into Operational Service on its Ready
      for Service Date. The Initial Site Service Dates, subject to the
      provisions of this Agreement, are as Follows:

      4.2.1  for the Phase I Stations, the Initial Site Service Date shall be
             the date 12 months from the grant of the Multiplex Licences
             provided that CTI shall use its reasonable endeavors to bring each
             of those Phase I Stations into

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      16
<PAGE>
 
             Operational Service on its Target Site Service Date or as soon as
             practicable thereafter;

      4.2.2  for each of the Phase II and Phase III Stations, the initial Site
             Service Date shall be the Target Site Service Date as extended by a
             period equal to the period of time between 30 September 1998 and
             the latest Initial Site Service Date for a Phase I Station agreed
             between the parties pursuant to Clause 4.2.1 or 4.3.1, as the case
             may be, provided that CTI shall use its reasonable endeavors to
             bring each of those Phase II and Phase III Stations on its Target
             Site Service Date.

4.3   Without prejudice to Clause 4.2:

      4.3.1  no later than 30 days after the grant of the Multiplex Licences,
             CTI and BDB will consider, in good faith, whether the Initial Site
             Service Dates for the Stations should be revised (taking into
             account, amongst other things, the obligation of CTI to use
             reasonable endeavors to bring each of the Stations into Operational
             Service on its Target Site Service Date; the requirements of BDB
             and of the digital terrestrial television industry generally,
             including the requirements of CTI and NTL to have sufficient time
             to roll-out the Stations in order to meet agreed Ready for Service
             Dates; and any Advance Works carried out); and

      4.3.2  not less than 90 days before each initial Site Service Date, CTI
             and BDB will again consider, in good faith, whether that Initial
             Site Service Date should be revised.

      If CTI and BDB agree to the revision of an Initial Site Service Date
      pursuant to this Clause 4.3 then BDB shall, having regard to its
      obligations under the Multiplex Licences, and where relevant, use its
      reasonable endeavors to seek the consent of the ITC (and any other
      regulatory authority having jurisdiction) to an Amended Site Service Date.
      If CTI and BDB agree and, where relevant, the ITC (and any other
      regulatory authority having jurisdiction) consent to the Amended Site
      Service Date, then such date shall be substituted as the Ready for Service
      Date.

4.4   If, pursuant to Clause 4.3, CTI and BDB decide not to revise an Initial
      Site Service Date, or fail to reach agreement relating to any proposed
      revision to an Initial Site Service Date, or the ITC (or any other
      regulatory body having jurisdiction) refuses to consent to any revision to
      a Start of Service Date proposed as a consequence then that Initial Site
      Service Date shall remain the Ready for Service Date unless, in the event
      of the ITC refusing to consent to a revision to the Start of Service Date,
      CTI and BDB nonetheless agree an Amended Site Service Date, in which case
      said Amended Site Service Date shall become the Ready for Service Date.

4.5   If at any time an event occurs or circumstances arise which may delay the
      bringing into Operational Service of any Station on the relevant Ready for
      Service Date, then

                                       17
<PAGE>
 
      CTI shall as soon as reasonably practicable (and in any event within 5
      Business Days of CTI becoming aware of the event or circumstances in
      question), notify BDB of that fact in writing. Such notification shall set
      out:

      4.5.1  the nature of the event or circumstances and whether they have
             arisen as a result of any of the causes set out in Clause 4.7;

      4.5.2  a description of the steps, if any, which CTI has identified are
             necessary to rectify the matter and bring the Station into
             Operational Service on the relevant Ready for Service Date or as
             soon as practicable thereafter; and

      4.5.3  the likely effect of the event or circumstances on the
             achievability of the relevant Ready for Service Date.

4.6   Following receipt by BDB of any notification pursuant to Clause 4.5, CTI
      and BDB shall discuss in good faith:

      4.6.1  actions which can be taken to rectify the matter; and

      4.6.2  any proposed change to the relevant Ready for Service Date.

4.7   Notwithstanding the foregoing, if any event or circumstance notified by
      CTI under Clause 4.5 is, or arises as a result of, one or more of the
      following:

      4.7.1  a Force Majeure Event;

      4.7.2  any material breach by BDB of any material obligations of BDB under
             this Agreement which prevents CTI from performing the relevant
             obligation under this Agreement; or

      4.7.3  compliance with any applicable law, the mandatory requirements of
             any national or supranational regulatory authority, the Radio
             Regulations or any other applicable statutory obligations
             (including, for the avoidance of doubt, frequency planning or
             international frequency clearance issues);

      then, such events shall be deemed, for the purposes of this Agreement, to
      be outside the control of CTI save to the extent that the event arose (in
      the case of an event under Clause 4.7.3 only) as a result of any breach of
      this Agreement by CTI. Accordingly, CTI shall have no liability to the
      extent delay arises from such events, whether under Clause 6.1 or
      otherwise, to pay any Delay Rebate, damages or other compensation to BDB
      as a result of the relevant Station not being ready for Operational
      Service by the Ready for Service Date as a result of such events and that
      Ready for Service Date shall be extended to the earliest practicable
      Amended Site Service Date on which BDB requires and CTI can, using its
      best endeavors, make the Station available for Operational Service in the
      light of the relevant event. The provisions of Clause 5 shall apply to
      determine whether the relevant Station is ready for Operational Service by
      the Amended Site Service Date.

                                       18
<PAGE>
 
4.8   The costs (subject to Clause 17.7) of circumventing or rectifying the
      consequences of the cause of delay set out in Clause 4.7 shall, save to
      the extent that the event arose (in the case of any event under Clause
      4.7.3 only) as a result of any breach of this Agreement by CTI be borne by
      BDB.

5.    TESTING

5.1   CTI shall, at its cost, test the Network and test each Station prior to
      its Ready for Service Date in accordance with Part I of Schedule 5 and all
      reasonable instructions of BDB. All Transmission Testing shall be
      conducted in accordance with any applicable law, licence or regulatory
      requirement (including, without limitation, the ITC Guidance Note on Test
      Transmissions).

5.2   Each Station shall be made available for testing prior to its Ready for
      Service Date as soon as reasonably required by BDB.

5.3   CTI shall provide BDB with reasonable advance notice of any Transmission
      Testing and BDB or its authorised representatives shall have the right to
      attend and monitor any Transmission Testing.

5.4   As soon as reasonably practicable before the Ready for Service Date for a
      Station. CTI will confirm to BDB that the Station is ready for Operational
      Service. Such confirmation shall be in writing and shall be accompanied by
      a full set of test results for each station showing that the Transmission
      Testing has been completed successfully. A Station shall be ready for
      Operational Service when it has satisfied the Transmission Testing.

5.5   BDB shall have the right to verify the results of the Transmission
      Testing. The costs of such verification shall be met by BDB save where
      such verification reveals that the Station in question has not satisfied
      the Transmission Testing in which case the costs of the verification and
      any subsequent Transmission Testing shall be met by CTI.

5.6   Between the Ready for Service Date and the Actual Site Service Date of
      each Station CTI shall perform such Test Transmissions from that Station
      as may reasonably be requested by BDB such Test Transmissions to be
      carried out at such times and for such periods as BDB may reasonably
      require. The costs of the Test Transmissions shall be met by CTI. BDB
      shall provide such BDB Signals or other material as are agreed with CTI
      for the purpose of enabling Test Transmissions, to be carried out.

6.    CONSEQUENCES OF FAILURE TO ACHIEVE READY FOR SERVICE, DATES

6.1   Subject to Clauses 4.2 and 6.2, if any Station is not ready for
      Operational Service by the relevant Ready for Service Date, then CTI shall
      be liable to pay a Delay Rebate in an amount in respect of the relevant
      Station calculated in accordance with Part II of Schedule 7, for the
      period from noon on the relevant Ready for Service Date to the Actual Site
      Service Date. The Delay Rebate shall be credited against the Charges

                                       19
<PAGE>
 
      payable in respect of the first month of the Year following the Year in
      which the Ready for Service Date originally fell.

6.2   The Distribution Network for each Station shall be available for
      Operational Service no later than the Ready for Service Date for that
      Station. With respect to each Phase I Station, if the Distribution
      Services are provided using the Fibre Distribution Network, CTI shall use
      all reasonable endeavors to ensure that the Distribution Network for that
      Phase I Station is ready for Operational Service on the date falling [*]
      days before the Start of Service Date for that Phase I Station. For the
      purposes of calculating Delay Rebate, due solely to failure to make the
      Fibre Distribution Network for a Phase I Station available the Ready for
      Service Date for that Phase I Station shall be deemed to be the date [*]
      days before the Start of Service Date for that Phase I Station and CTI
      shall not be liable in breach of contract for any failure to have the
      Fibre Distribution Network for that Phase I Station ready for Operational
      Service prior to that date.

6.3   If BDB elects to employ the Satellite Distribution System pursuant to
      Clause 2.17, CTI shall ensure that the satellite space segment necessary
      to provide the Distribution Services is available for use by CTI as from a
      date to be agreed between the parties and, in any event, no later than 60
      days prior to the first Start of Service Date.

7.    MODIFICATIONS TO EXISTING ANALOGUE TRANSMISSION SYSTEMS

7.1   CTI shall, at its own cost and in a proper manner carry out or procure
      that the work described in the Agreed Impact Schedule is carried out as
      requested in order to enable Operational Service to commence from each
      Station an the relevant Ready for Service Date and subject to Clause 7.3
      in compliance with the Multiplex Licences and shall promptly carry out any
      other work agreed by BDB and CTI to effect changes required to the
      analogue transmitter network as a consequence of transmission on the
      frequencies allocated to the BDB Multiplexes.

7.2   In the event that any analogue modification works are required to overcome
      interference caused by or as a direct consequence of the Network to
      analogue television broadcast services in addition to those works
      identified in the Agreed Impact Schedule, then CTI will provide details of
      the works to be carried out, the costs and estimated duration of such
      works and such other information as BDB may reasonably require and CTI
      will, where required by BDB, carry out such works and meet the reasonable
      costs and expenses (provided that BDB shall not be charged more than its
      appropriate share) of the carrying out of such works agreed by BDB (the
      "EXPENDITURE").[*]

7.3   Nothing in this Agreement shall impose any obligation on CTI to carry out
      domestic returning or antenna alignment or to establish a help desk or
      similar facility to deal

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      20
<PAGE>
 
       with queries or complaints from the general public in connection with the
       provision of the Services.

8.     SECURITY AND SITES

8.1    CTI will take and procure that its sub-contractors take all such security
       measures in relation to the Network (including, but not limited to at the
       Sites) as would normally be taken by an experienced distribution and
       transmission services provider including, but not limited to, security
       measures at the Stations to protect against forcible entry and damage by
       vandals and burglars using hand operated tools, including protection of
       doors and windows in Station buildings, protection of antenna feeders by
       scaled underground ducting, steel tube or trunking protection of feeds
       located above ground to a height above anti-climbing guards on the
       antenna support structures, and intruder alarms at all monitored
       unattended Stations. CTI shall regularly review the efficacy of such
       security measures and shall take additional security measures at Stations
       allocated high priority status by CTI as set out in Schedule 8, such
       additional security measures to include, without limitation, additional
       monitored security fencing and security cameras.

8.2    Where CTI is not the owner of a Site and the owner of that Site wishes to
       terminate CTI's right to use the Site, CTI will notify BDB of such
       intended termination as soon as reasonably practicable and shall consult
       with and where practicable pay due heed to any recommendations made by
       BDB. CTI shall, in any event make all necessary arrangements for the
       provision of a substitute station which shall become a Station for the
       purposes of this Agreement, subject to receiving the consent of ITC (and
       other relevant regulatory authorities) and BDB (such consent riot to be
       unreasonably withheld by BDB). CTI shall use all reasonable endeavors to
       ensure that this event does not give rise to a material deterioration of
       the level or quality of the Services.

9.     INDUSTRY LIAISON AND SPECTRUM MANAGEMENT

9.1    CTI will throughout the Term:

       9.1.1   work closely with BDB and all relevant third parties in providing
               its technical expertise and support (including, but not limited
               to, BDB's chosen systems integrator, the ITC, the
               Radiocommunications Agency. NTI., other relevant organisations,
               other multiplex distribution and transmitter network services
               operators, receiver, set top box and other equipment
               manufacturers) with a view to achieving the interoperability of
               services and equipment and the successful launch of digital
               terrestrial television in the UK;

       9.1.2   liaise with relevant organisations and groups such as the UK
               Digital Television Group;

       9.1.3   attend or be represented at relevant meetings (to the extent that
               CTI is permitted or invited to attend) relating to digital
               terrestrial television broadcasting; and

                                       21
<PAGE>
 
       9.1.4   assist BDB where reasonably requested in preparing written
               representations or submissions to regulators, industry or
               government bodies or working groups relating to the subject
               matter of this Agreement, including representations or
               submissions relating to digital terrestrial television
               broadcasting.

9.2    Throughout the Term, CTI will co-operate with and assist BDB where
       reasonably requested by it, in relation to questions of spectrum
       management or frequency clearances.

9.3    CTI will provide BDB with engineering advice on interference problems
       arising from the roll-out of the Transmission Network. CIT will at its
       own expense provide reasonable support to BDB equivalent to one CTI
       engineer (including vehicle if required) for two man years of effort.

9.4    CTI will at its own cost verify coverage of the Stations as set out in
       Schedule 4 Part IV until such time as the parties reasonably agree that
       measured coverage correlates with predictions.

9.5    Further support will be made available to BDB (if required) for an extra
       charge. This additional support will be charged on a rate card basis at
       the following 1997 rates (which rates are subject to annual percentage
       increase equal to the percentage increase in RPI over the previous twelve
       months):

       9.5.1   Engineer @: [*] per hour plus reasonable expenses;

       9.5.2   Survey Vehicles @: [*] each per day or [*] each per week; and

       9.5.3   Miscellaneous expenses (e.g. fuel, ferries, tolls) at cost.

10.    LICENCES

10.1   CTI shall, subject to Part VI of Schedule 2, at its own cost, obtain and
       maintain during the Term the TA Licences and the WTA Licences and all
       other consents and clearances of whatever nature required to enable it to
       lawfully perform its obligations under this Agreement (including, but not
       limited to, local planning authority approvals and relevant site sharing
       agreements in relation to any Third Party Sites) and CTI shall to the
       extent required to operate the Network and provide the Services comply
       with the terms of all such licences, clearances and consents and shall
       not do anything or omit to do anything which would cause such licences,
       clearances or consents to be suspended, avoided, adversely varied,
       revoked or not renewed.

10.2   BDB shall obtain and maintain at its own expense during the Term the BDB
       Multiplex Licences and all other consents and clearances required to
       enable it to perform its obligations under this Agreement and BDB shall,
       to the extent necessary to enable it to perform its obligations under
       this Agreement, comply with the terms of such licences and consents and
       shall not do anything or omit to do anything which would

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      22
<PAGE>
 
       cause such licences, clearances or consents to be suspended, avoided,
       adversely varied or revoked.

11.    BDB SIGNALS

11.1   BDB shall supply the BDB signals to CTI in accordance with the Handover
       Requirements at the BDB interface.

11.2   In the event of interruption or degradation to the BDB Signals occurring
       prior to receipt of the BDB Signals at the BDB Interface, the onus shall
       be upon BDB to establish and remedy the cause, at its own cost. CTI shall
       not be held to be in breach of any of its obligations under this
       Agreement resulting solely from interruption or deterioration in the
       quality of transmission of the BDB Signals in such circumstances provided
       that CTI shall continue to transmit the BDB Signals to the extent it is
       able to do so, unless instructed to the contrary by BDB.

11.3   BDB will supply the BDB Signals in such form as is necessary to permit
       CTI to comply with the relevant provisions of the 1996 Act, the terms of
       the BDB Multiplex Licences, the WTA and the Telecomms Act and any other
       licence which governs the running of the Network.

11.4   Without limitation to the generality of Clause 11.3, BDB undertakes that
       the BDB Signals will not contain any material:

       11.4.1  which is defamatory, offensive or abusive or of an obscene or
               menacing character; or

       11.4.2  which constitutes a violation or infringement of the rights of
               any person (including but not limited to all intellectual
               property rights such as moral rights, rights of copyright or
               confidentiality) or infringement of any law.

Provided that any breach of this Clause 11.4 shall not give CTI the right to
terminate this Agreement pursuant to Clause 18.

11.5   BDB warrants to CTI that it will perform its obligations under this
       Agreement in compliance with all applicable laws and legally binding
       regulations, directions, permissions, licences, waivers, consents,
       registrations. approvals and other authorities of competent authorities
       in the UK or elsewhere.

11.6   BDB will indemnify CTI against all losses, costs, claims, damages and
       expenses arising out of a breach of Clauses 11.4 or 11.5 (A "RELEVANT
       CLAIM").

11.7   If CTI becomes aware of a matter which might give rise to a Relevant
       Claim:

       11.7.1  CTI shall notify BDB immediately of the matter (stating in
               reasonable detail the nature of the matter and, if practicable,
               the amount claimed) and consult with BDB with respect to the
               matter; if the matter has become the subject of proceedings, CTI
               shall if the existence of the proceedings are known by it

                                       23
<PAGE>
 
               notify BDB within sufficient time to enable BDB to contest the
               proceedings before final judgment;

       11.7.2  subject to any bona fide binding obligations of confidentiality,
               CTI shall provide BDB and its advisers with reasonable access to
               CTI premises and personnel and use its reasonable endeavors to
               procure access to other relevant premises and personnel and to
               all relevant assets, documents and records that it possesses or
               controls for the purposes of investigating the matter and
               enabling BDB to take the action referred to in Clause 11.7.4;

       11.7.3  subject to any bona fide binding obligations of confidentiality,
               BDB may, at its cost, take copies of the relevant CTI documents
               or records, and photograph the premises or assets, specified in
               Clause 11.7.2. CTI shall use reasonable endeavors to procure any
               requisite consents to allow BDB to obtain copies of third party
               documents or records in its control or possession.

       11.7.4  CTI shall (subject to BDB indemnifying CIT against the cost or
               damages incurred thereby):

               (a)  take any action and institute any proceedings, and give any
                    information and assistance BDB may reasonably request to:

                    (i)  dispute, resist, appeal, compromise, defend, remedy or
                         mitigate the matter; or

                   (ii)  enforce against a person (other than BDB) CTI's rights
                         in relation to the matter; or

               (b)  in connection with proceedings related to the matter (other
                    than against BDB) use advisers chosen by BDB and, if BDB
                    requests, allow BDB the exclusive conduct of the
                    proceedings; and

               (c)  not waive any defence or settle any claim without BDB's
                    prior written approval (such approval not to be unreasonably
                    withheld or delayed).

11.8   Nothing in this Clause 11 in any way restricts or limits CTI's general
       obligation at law to mitigate a loss which it may incur as a result of a
       matter giving rise to a claim pursuant to Clause 11.6.

11.9   Nothing in this Clause 11 shall impose any obligation on CTI to monitor
       the BDB Signals to ensure that they do not contain any material
       transmission of which would result in a breach of Clause 11.4.

11.10  In the event that BDB is required to suspend broadcasting of the BDB
       Signals as a result of any breach of Clause 11.4 or otherwise as the
       result of any applicable law, or regulatory requirement (including but
       not limited to compliance with a direction of the ITC) for any reason,
       CTI shall, upon receipt of written notification from BDB or

                                       24
<PAGE>
 
       earlier if pursuant to a legal requirement, suspend provision of the
       Services for the requisite period notified by BDB (or such longer period
       as necessary pursuant to the legal requirement) provided that in doing so
       CTI shall not incur any liability to pay Service Credits to BDB and BDB
       shall continue to pay (subject to Clause 17.9) the Charges for the
       Services in accordance with the provisions of Schedule 2.

12.    EQUIPMENT LOCATED AT BDB PREMISES

12.1   BDB will permit CTI to locate:

       12.1.1  Network Status System equipment comprising a personal computer
               and interface (with suitable electronic firewall systems
               installed) linked by data circuit to the TOC as described in
               Schedule 3 Part IIIa: and

       12.1.2  equipment to be installed in the CTI Area as described in
               Schedule 6 Part I:

       in such reasonably suitable location at BDB's Multiplex Centre as BDB my
       determine, free of charge and to connect the same to a power source
       provided at the cost of BDB.

12.2   CTI will be responsible and will otherwise procure at its own cost that
       the data circuit is monitored and the database and the software
       application and the other Equipment referred to in Clause 12.1 above are
       maintained for the duration of this Agreement.

12.3   Ownership of the Equipment referred to in Clause 12.1 shall remain vested
       in CTI. BDB shall nevertheless be responsible for the said Equipment once
       it is installed on BDB premises and BDB shall be responsible for the
       reasonable cost of replacing any part of the said Equipment that is
       damaged lost or stolen while in BDB's custody other than as a result of
       any act or omission on the part of CTI or its agents or contractors.

12.4   BDB shall grant CTI and its authorised sub-contractors all reasonable
       access to the Equipment referred to in Clause 12.1 during normal business
       hours for the purpose of installing, inspecting, maintaining, renewing,
       upgrading and removing the said Equipment from the Multiplex Centre, as
       necessary. CTI shall itself and shall procure that its sub-contractors,
       comply with all applicable Health and Safety legislation and regulations
       and any code of practice or safety at work rules operated by BDB or the
       occupier of the Multiplex Centre in respect of the Multiplex Centre and
       all other reasonable instructions of BDB or such owner or occupier of the
       Multiplex Centre.

13.    CONTRACT MANAGEMENT, REVIEW OF SERVICES AND DISPUTES

       CONTRACT MANAGEMENT

13.1   BDB and CTI will meet, at regular intervals with such frequency as may be
       reasonably required by BDB, for the purposes of project planning,
       discussing and reviewing the provision of the Services and, In
       particular, the progress of the rollout

                                       25
<PAGE>
 
       plans. CTI shall provide project planning information to BDB with such
       frequency and in such form as BDB may reasonably request.

       Service Management Board

13.    CTI and BDB will establish a Service Management Board (the composition of
       which shall be agreed between CTI and BDB) to deal with all major matters
       concerning the amendment, or the reviewing of the operation, of this
       Agreement. The Service Management Board will consist of two or more
       representatives of each party. The Service Management Board will meet at
       least once a Year, or at such other times as is agreed between the
       parties or is required under the terms of this Agreement. The Service
       Management Board's remit will be as follows:

       13.2.1  not less frequently than every three years during the Term to
               perform a technical review of the Equipment comprised in the
               Network and equipment available in the market. Where
               opportunities are identified to operate the Services more cost
               efficiently, the parties will co-operate in good faith and where
               practicable CTI will, if required by BDB, take advantage of such
               opportunities, provided neither party is disadvantaged as a
               result;

       13.2.2  to attempt to resolve any disputes that may arise between the
               parties;

       13.2.3  to consider and plan for the implementation of new services and
               any Additional Stations; and

       13.2.4  any other matters which the parties may agree from time to time.

       Disputes

13.3   Any complaints, disputes or problems (each an "Issue") relating to this
       Agreement will be escalated as set out in this Clause 13.3:

       13.3.1  if an Issue is not resolved to the satisfaction of either party
               within 30 days of both parties having first been aware of it,
               then either party may refer the Issue to the Service Management
               Board;

       13.3.2  if an Issue is referred to the Service Management Board, then
               each party must procure that their representatives on the Service
               Management Board discuss the issue in good faith at the next
               meeting of the Service Management Board with a view to resolving
               it. Either party may convene a meeting of the Service Management
               Board to be held within 14 days of an Issue being referred to it.
               If the Issue is not resolved to the satisfaction of either party
               within 7 days of the meeting of the Service Management Board,
               then either party may refer the Issue to the Director of Options
               of BDB, in the ease of BDB ("THE BDB NOMINEE") and to the Chief
               Operating Officer of CTI in the case of CTI ("THE CTI NOMINEE");

                                       26
<PAGE>
 
       13.3.3  if the Issue is referred to the BDB Nominee and the CTI Nominee,
               then each party must procure that their representatives discuss
               the Issue in good faith as soon as reasonably practicable and in
               any event, within 14 days of the meeting of the Service
               Management Board referred to in Clause 13.3.1;

       13.3.4  if an Issue which relates solely to matters of an engineering or
               technical nature is not resolved pursuant to Clause 13.3.3,
               either party may refer it (with a request that the person
               appointed does not have a conflict of interest) for adjudication
               to the President for the time being of the Institution of
               Electrical Engineers, or his nominee. The President or his
               nominee shall act as an expert, not an arbitrator. The party
               referring any Issue for adjudication must deliver to the expert
               and the other party a notice setting out the matters in dispute
               and any relevant supporting evidence. The other party shall be
               entitled to reply to the notice and such evidence, delivering
               such reply to the expert and the party referring the Issue.
               Otherwise, the expert shall be entitled to decide on the
               procedure he or she wishes to adopt. Any determination of the
               expert must be in writing and shall be final and binding on both
               parties failing any manifest error on the face of the decision.
               Unless the expert determines otherwise, both parties will bear
               their own costs of the determination and half the costs of the
               expert;

       13.3.5  if an Issue which does not relate solely to matters of an
               engineering or technical nature is not resolved pursuant to
               Clause 13.3.3, either party may refer it to mediation in
               accordance with the Centre for Dispute Resolution procedures then
               in force. The other party shall not be obliged to attend such
               mediation. If after 30 days of the matter being referred to
               mediation or if either party believes that mediation has not
               resolved the Issue or it believes that it is not appropriate to
               resolve the issue by mediation or the other party has refused to
               attend mediation, then either party may proceed to litigation.
               Unless agreed otherwise, each party will bear their own costs of
               the mediation and half the costs of any third party involved;

       13.3.6  except where clearly prevented by the nature of the Issue, the
               parties shall continue performing their respective obligations
               under this Agreement while any Issue is escalated in accordance
               with this Clause 13.3. Without prejudice to the generality of the
               foregoing, BDB shall continue to pay the Charges.

14.    PERFORMANCE MONITORING AND REPORTING

       Network Status System

14.1   CTI shall supply, install and maintain a Network Status System, (a
       description of the functionality of which is set out in Part IIIA of
       Schedule 3 and Part II of Schedule 6), which shall provide substantially
       similar information regarding the status of the Network as Is available
       to CTI, at the location described in Clause 12.1 or such other location
       within the UK as BDB may reasonably direct. The Network Status System

                                       27
<PAGE>
 
       shall give an overview of the entire Network indicating the current
       status of the Distribution Network, the Transmission Network and all the
       Stations.

       Monitoring

14.2   CTI shall monitor, control and report on the transmission of the BDB
       Signals against the Technical Specification.

14.3   CTI shall immediately notify the BDB Representative of any Transmission
       Fault in relation to the Services and shall, as soon as reasonably
       practicable, issue a Fault Report in the form reasonably prescribed by
       BDB (to include, without limitation, a fault number, the time the
       Transmission Fault occurred, the nature of the Transmission Fault and the
       anticipated time it will take to remedy the Transmission Fault).

14.4   CTI shall respond to any Transmission Faults of which it becomes aware
       (whether through its monitoring of the Services, as a result of such
       Transmission Faults being reported to it by BDB or otherwise), as soon as
       reasonably practicable, within the Response Times.

14.5   CTI shall monitor the quality of the BDB Signals received at the BDB
       Interfaces. CTI shall, as soon as reasonably practicable, notify the BDB
       Representative where any signal interruption or degradation is identified
       at the BDB Interface and where requested by BDB will provide reasonable
       assistance to BDB, at BDB's cost, in establishing and remedying its
       cause.

14.6   Notices issued by CTI pursuant to Clauses 14.3 and 14.5 shall be
       delivered via telephone in the first instance, and confirmed by e-
       mail/fax to the BDB Representative at the Multiplex Centre or such other
       number and address as BDB may notify to CTI for the purpose.

       Performance Reporting

14.7   CTI shall produce a monthly performance review report relating to its
       compliance with the Technical Specification in the previous month. The
       report shall be provided in such format as BDB may reasonably require and
       shall, in particular, set out the following:

       14.7.1  a list of all Transmission Faults that have occurred during the
               period covered by the report (including those which are not to be
               taken into account in calculating Accountable Availability);

       14.7.2  a separate list of all Transmission Faults which are to be taken
               into account in calculating Accountable Availability which have
               occurred during the period covered by the report together with
               the actual response times and correction times; and

                                       28
<PAGE>
 
       14.7.3  such other information as may reasonably be requested by BDB from
               time to time.

14.8   The report required under Clause 14.7 shall be sent to the BDB
       Representative within seven days of the end of each month.

       Annual Reporting

14.9   On or before 1st February in each Year (or on such other date as may be
       agreed between the parties), CTI will provide to BDB an annual written
       report to be prepared at CTI's cost which:

       14.9.1  describes the provision of the Services (including performance
               changes and improvements of the Service) made during the last
               Year;

       14.9.2  contains information concerning technological developments in
               telecommunications and broadcasting which are relevant to the
               provision of the Services:

       14.9.3  includes an executive summary; and

       14.9.4  is otherwise in such format and contains such material as BDB may
               reasonably request.

       DTT Surveys

14.10  CTI will provide BDB with a Reception Survey in respect of Stations when
       they are ready for Operational Service in such format as is described in
       Schedule 4 Part IV. Nothing in this Agreement shall constitute any
       warranty, representation or obligation on the part of CTI as to the size
       of population actually capable of receiving the BDB Signals transmitted
       by CTI under this Agreement.

       Performance Database

14.11  Source material relevant to monitoring shall be recorded by CTI in an
       electronic database (THE "PERFORMANCE DATABASE") which will be archived
       monthly and the data kept for six years from the end of the Year to which
       the material relates, CTI shall provide BDB and its authorised
       representatives with reasonable access to the Performance Database.

15.    MAINTENANCE

15.1   Without prejudice to CTI's obligations to provide the Services on the
       terms of this Agreement:

       15.1.1  CTI shall ensure throughout the term of this Agreement that it
               has all necessary equipment, facilities, resources and services
               to be able to provide the Services as described in Schedule 4
               Part III;

                                       29
<PAGE>
 
       15.1.2  CTI shall be entitled to interrupt the Services or to depart from
               the Technical Specification in any life threatening or property
               threatening emergency for the purposes of safety or if it is
               necessary to do so for essential maintenance at any of the
               Stations provided that CTI shall use all reasonable endeavours to
               reduce the impact of such emergency or essential maintenance
               works or repairs on the provision of the Services (including,
               without limitation, by performing such essential maintenance
               works or repairs at times when the audience for the services
               transmitted from the relevant Stations are low);

       15.1.3  CTI may also interrupt the DTT Transmission Services or depart
               from the Technical Specification in order to carry out any
               planned installation works on the antenna support structures at
               any of the Stations;

       15.1.4  CTI shall provide to BDB a schedule of planned maintenance on
               antennas and structures on a rolling twelve month basis as set
               out in Schedule 4 Part III;

       and, save in cases of emergency, CTI will use all reasonable endeavours
       to agree times and duration of any interruption or impairment of the
       Services with the BDB Representative and use all reasonable endeavours to
       minimise the duration of any such interruption or impairment.

15.2   In cases where the Services are provided from a Third Party Site, BDB
       acknowledges that CTI may be required by the Site Owner to interrupt the
       DTT Transmission Service from the Third Party Site, on reasonable prior
       notice in the case of planned access or without notice in cases of
       emergency, so that safe access may be gained to any mast or the Equipment
       at the Third Party Site. CTI shall procure that the Site Owner does not
       interrupt, or require CTI to interrupt, the BDB Transmission Service in
       such circumstances save:

       15.2.1  in the event of any life or property threatening emergency;

       15.2.2  where any interference caused by the Equipment is creating
               significant degradation to the services of the users of the Third
               Party Site and the degradation still exists after the Site Owner
               has taken all reasonable measures to contact and inform CTI of
               such degradation and, where practicable to do so, the Site Owner
               has allowed CTI a reasonable period to remedy any such
               Interference;

       15.2.3  it is required to do so by the Department of Trade and Industry
               (or its statutory successor or equivalent); or

       15.2.4  with the agreement and at the request of CTI (which shall not be
               forthcoming without BDB's consent, such consent not to be
               unreasonably withheld or delayed) 

                                       30
<PAGE>
 
      and CTI shall further procure that, where practicable, such interruptions
      occur at times and for duration reasonably agreed with BDB and during
      periods when the audience receiving the BDB Signals is anticipated to be
      low.

15.3  In the case of a Transmission Fault which cannot be dealt with by remote
      control, CTI shall ensure that the time from the occurrence of the
      Transmission Fault until the time an Engineer attends at the site of the
      Transmission Fault or other impairment does not exceed the relevant
      Response Time.

15.4  CTI shall ensure that action is taken to rectify any Transmission Fault or
      other impairment as soon as practicable after the time of the occurrence
      of the Transmission Fault or other impairment.

15.5  CTI shall obtain, commission and provide at CTI's expense the Emergency
      Reserve Equipment and the Disaster Recovery Systems and such other
      equipment and services as would normally be held by a prudent distribution
      and transmission services operator to restore distribution and
      transmission services similar to the Services in the event of loss of the
      same.

15.6  CTI shall permit BDB or its authorised representative by reasonable prior
      arrangement to visit any of the Stations accompanied by a representative
      of CTI, for the purpose of inspecting that part of the Network located
      there. In such circumstances CTI shall be entitled to invoice BDB, as an
      additional charge, its reasonable attendance costs of a member of the
      local maintenance team calculated in accordance with CTI's standard
      ratecard. This charge shall not apply before the Start of Service Date of
      each Station. BDB shall itself and shall procure that its subcontractors,
      comply with all applicable Health and Safety legislation and regulations
      and any code of practice or safety at work rules operated by CTI (or NTL)
      at the applicable Station.

16.   CHANGE CONTROL

16.1  Except as expressly set out in this Agreement, any changes to this
      Agreement or any of the Services proposed by CTI shall be dealt with in
      accordance with Schedule 1, Part I.

16.2  Except as expressly set out in this Agreement, any changes to this
      Agreement or any of the Services proposed by BDB shall be dealt with in
      accordance with Schedule 1, Part II.

17.   CHARGES, SAVINGS, PAYMENT AND BILLING

      Charges and Payment for the Services

17.1  In consideration for the satisfactory performance by CTI of its
      obligations under this Agreement BDB shall pay the Charges (in Pounds
      Sterling) in accordance with the payment timetable and instalment
      provisions set out in Schedule 2.

                                       31
<PAGE>
 
17.2  Upon this Agreement coming into full force and effect, Advance Payments
      paid by BDB pursuant to the Pre-Contract Funding Agreement shall be set
      off against the equivalent monthly charges which would have been payable
      pursuant to this Agreement had this Agreement been in full force and
      effect from the date hereof.

17.3  In the event that the Commencement Date occurs between 1 October 1998 and
      31 December 1998 and in consequence CTI incurs any material additional
      operational expenditure over the Term, BDB shall bear the cost of such
      increase, the method of recovery to be determined under the Change Control
      Procedure. If this Agreement has not become unconditional in accordance
      with its terms prior to 1 January 1998, then:

      17.3.1  In the event that the Term will extend beyond 31 December 2010,
              for the period commencing 1 January 2011 until the expiry of the
              Term ("RELEVANT PERIOD"), CTI shall be entitled to recover Charges
              at a fair market price in respect of the Relevant Period to be
              agreed between the parties. In default of agreement between the
              parties as to fair market price, the provisions of Clauses 18.2
              and 18.3 shall apply mutatis mutandis as if references in those
              Clauses to the Extended Term were references to the Relevant
              Period; and

      17.3.2  the Charges shall be adjusted by an amount equal to any bona fide
              material overall variation (A "COSTS VARIATION") to CTI's third
              party costs or operational costs relating to the provision of the
              Services to be agreed by the parties. In default of agreement
              between the parties as to the amount of that Costs Variation, the
              provisions of Clauses 18.2 and 18.3 shall apply mutatis mutandis
              as if references in those Clauses to the Extended Period were
              references to the Relevant Period and references to fair market
              price were to the Costs Variation.

17.4  The Charges are based on the provision of the Services and the roll-out of
      the Stations as set out in this Agreement. If the roll-out of the Stations
      is revised, the Charges shall be adjusted by CTI by an amount agreed
      pursuant to the Change Control Procedure.

17.5  CTI will operate a transparent open book approach to the provision of the
      Services, including, but not limited to, by providing BDB with access to
      CTI's information regarding CTI's costs in acquiring the Equipment,
      constructing or procuring the Network and providing the Services.
      Information provided under this Clause will be provided to BDB pursuant to
      Clause 17.6 or at such other times as reasonably requested by BDB.

17.6  [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      32
<PAGE>
 
       Savings

17.7   Throughout the Term CTI will work with BDB, other multiplex licensees and
       equipment and service providers to seek to reduce CTI's costs in
       providing the Services. To the extent that any overall savings are
       achieved which have not (in respect of the Agreed Proportion thereof)
       been applied by CTI to defray increased or unforeseen costs in lieu of
       the Contingency Amount, CTI will reduce the Charges by an amount equal to
       the Agreed Proportion of such savings such reduction to be implemented in
       such a manner as to avoid financial disadvantage to CTI caused by any
       changes to the instalment payment of the Charges.

17.8   CTI shall use its reasonable endeavours to mitigate costs it may incur
       pursuant to Clauses 4.7 and 4.8 and, if CTI makes an overall saving in
       its costs as a result of a delay pursuant to Clause 4.7 such overall
       savings shall be passed in their entirety on to BDB by way of a reduction
       to the Charges the manner of implementation of which shall be agreed
       through the Change Control Procedure.

17.9   If CTI makes any overall saving in its costs as a result of the
       suspension of the provision of the Services pursuant to Clause 11.10, it
       shall pass on the benefit of such overall savings to BDB in its entirety
       by way of a reduction to the Charges, the manner of implementation of
       which shall be agreed through the Change Control Procedure.

       Invoices

17.10  CTI will invoice BDB monthly in arrears, with invoices to be issued at
       the end of each month. The first such invoice will be issued at the end
       of the first full month since this Agreement became unconditional in
       accordance with its terms. All invoices will be addressed to Director of
       Operations, at the address in Clause 24.

17.11  Each invoice rendered by CTI shall be accompanied by such billing
       information and be in such format as BDB may reasonably require and as
       may be required by law or regulatory requirements.

17.12  Except in the event of a disagreement as to the amount due, correctly
       prepared and submitted invoices shall be paid by BDB on the 13th day
       following the date of CTI's

                                       33
<PAGE>
 
       invoice (the "DUE DATE"). Invoices shall be payable by electronic funds
       transfer to Royal Bank of Scotland plc, Corporate Banking Office, P.O.
       Box 450, 5-10 Gt. Tower Street, London, EC3P 3HX (account no. 20071038,
       sort code 16-04-00) or in such other manner as CTI may reasonably direct
       and shall be paid in full, subject only to Clause 17.14, without any
       withholding, set-off or deduction whatsoever.

17.13  CTI may charge interest on outstanding amounts payable to CTI from the
       Due Date until payment in full is received by CTI at a rate equal to 2
       per cent. per annum above the base lending rate of the Royal Bank of
       Scotland plc as current from time to time whether before or after
       judgement. Interest accrues daily and will continue to accrue on any
       unpaid amounts notwithstanding termination of this Agreement for any
       cause.

17.14  Subject to Schedule 7, if any Service Credits or Delay Rebate are payable
       hereunder, such Service Credits and Delay Rebate shall be deducted from
       the Charges by an adjustment made by CTI to the first payment due in
       respect of the Year following the Year in which the Service Credits or
       Delay Rebate accrued. Any Service Credits or Delay Rebate payable in
       respect of the final Year shall be paid by CTI to BDB no later than 30
       days after the termination or expiry of this Agreement.

18.    TERM, TERMINATION AND SUSPENSION

       Commencement and the Term

18.1   This Agreement shall come into force as provided in Clause 2.1 and unless
       terminated earlier shall continue in force for the Term.

18.2   BDB shall have the option to extend the Term for a further period of not
       less than 6 years but not exceeding 12 years (the "EXTENDED TERM") by
       giving notice in writing to CTI not less than 12 months' prior to the
       expiry of the Term. Such Extended Term to be on the then current terms of
       this Agreement save that the Charges shall be revised to a level agreed
       by the parties to represent a fair market price for the Services to be
       provided during the Extended Term having regard amongst other things to
       the availability of the existing Network and Equipment and any expected
       replacement costs thereof.[*]

18.3   [*]

[*]    indicates where text has been omitted pursuant to a request for
       confidential treatment. The omitted text has been filed with the
       Securities and Exchange Commission separately.

                                       34
<PAGE>
 
       Termination

18.4   Subject to Clause 18.5, if either party is in material breach of this
       Agreement (the "BREACHING PARTY"), the other party may, by notice in
       writing, terminate this Agreement by giving three months' prior written
       notice.

18.5   In the case of a material breach of this Agreement which is remediable,
       the other party may serve a notice on the Breaching Party giving details
       of the breach and requiring it to remedy the breach within 30 days of
       receipt of the notice. If the Breaching Party fails to remedy the breach
       within the period specified in the notice then the other Party may
       terminate this Agreement by giving two months' prior written notice
       during which BDB, if the other party, may suspend taking the Services and
       payment of the Charges to CTI.

18.6   BDB may terminate this Agreement on 30 days written notice if any TA
       Licences are suspended or revoked thereby preventing the lawful
       performance by CTI of this Agreement.

18.7   In the event of a suspension or revocation of a right to use a frequency
       under a WTA Licence:

       18.7.1  CTI shall endeavour to reverse the effect of the suspension or
               revocation;

       18.7.2  if CTI cannot implement Clause 18.7.1, the parties shall attempt
               to agree on whether to exclude the affected Station from the
               Services and the consequent reduction in the Charges; and

       18.7.3  in the event that neither of the above are achieved within 30
               days or any longer period reasonably agreed by the parties, BDB
               may terminate this Agreement on 30 days written notice provided
               that the effect of the suspension or revocation is such as to
               cause the ITC to revoke or threaten to revoke the Multiplex
               Licences or otherwise has the effect that BDB is deprived of
               revenue equivalent to three month's worth of Relevant Revenue.
               For the purpose of this clause Relevant Revenue means 2% of BDB's
               revenue for the twelve months preceding the event.

18.8   Either party may terminate this Agreement with immediate effect by
       written notice if:

       18.8.1  a liquidator, administrative receiver, administrator or receiver
               is appointed (other than for the purpose of an amalgamation or
               reconstruction, the terms of which have been previously approved
               by the party having the right to terminate (such approval not to
               be unreasonably withheld or delayed in the

                                       35
<PAGE>
 
               case of a solvent amalgamation or reconstruction)) in respect of
               the whole or a material part of the assets and/or undertaking of
               the other party; or

       18.8.2  the other party enters into an arrangement or composition with
               its creditors, or if it becomes unable to pay its debts within
               the meaning of section 123 of the Insolvency Act 1986.

       Suspension

18.9   CTI may suspend provision of the Services in whole or in part until
       further notice on notifying BDB in writing with immediate effect from
       receipt by BDB of the notice on the occurrence of any of the following (a
       "SUSPENSION EVENT"):

       18.9.1  BDB is in material breach of this Agreement which, in the case of
               a breach capable of remedy, BDB has failed to remedy within 30
               days of receipt of notice from CTI to do so; or

       18.9.2  any licence required by law to be held by BDB is cancelled,
               revoked, not renewed, suspended or otherwise terminated by the
               relevant licensing body thereby preventing the lawful performance
               by CTI of this Agreement;

       18.9.3  The suspension of this Agreement is required in order to comply
               with a mandatory order, instruction or request of any government
               minister, The Home Office, The Channel Islands, Isle of Man
               Authorities, an emergency services organisation or any other
               competent administrative authority.

       Provided that BDB will nevertheless remain liable for its payment
       obligations under the Agreement (subject to CTI mitigating its losses)
       and CTI's right to suspend the provision of the Services pursuant to this
       Clause shall only apply in respect of any particular Station or BDB
       Multiplex to the extent that and for so long as the Suspension Event
       occurred in respect of that Station or BDB Multiplex. Subject to BDB
       continuing to meet its payment obligations as aforesaid CTI agrees that
       the right of suspension, where exercised, shall be CTI's sole remedy for
       any breach in respect of which the right to suspend has been exercised.
       If CTI makes any overall savings, in its costs as a result of suspension
       pursuant to this Clause 18.9 it shall pass the benefit of these savings
       to BDB by crediting such saving as a reduction in the Charges, the manner
       of implementation of which shall be agreed through the Change Control
       Procedure.

       Consequences of Termination

18.10  Expiration or termination for whatever reason of this Agreement will not
       affect any rights of the parties which have accrued prior to its
       expiration or termination including, without limitation, any right to
       claim damages for breach of this Agreement.

                                       36
<PAGE>
 
18.11  If pursuant to Clauses 18.4, 18.5, 18.7, 18.8 or 20.2 BDB becomes
       entitled to and does exercise its right to terminate this Agreement it
       may also exercise a right to purchase Exclusive Equipment in accordance
       with and subject to the provisions of Schedule 10.

19.    WARRANTIES

19.1   Each party warrants to the other that it has full power and authority to
       enter into and perform its obligations under this Agreement.

19.2   CTI warrants to BDB that the use of the Network and the Services by BDB
       in accordance with this Agreement will not place BDB in breach of any
       law, regulation, direction, permission, waiver, consent, registration,
       approval or other authorisation.

20.    FORCE MAJEURE

20.1   If a party (the "AFFECTED PARTY") is prevented, hindered or delayed from
       or in performing any of its obligations under this Agreement by a Force
       Majeure Event:

       20.1.1  the Affected Party's obligations under this Agreement are
               suspended from notification of the event in accordance with
               Clause 20.1.2 while the Force Majeure Event continues but only to
               the extent that it is so prevented, hindered or delayed:

       20.1.2  immediately after the start of the Force Majeure Event the
               Affected Party shall notify the other party in writing of the
               Force Majeure Event, the time and date on which the Force Majeure
               Event started and the effects of the Force Majeure Event on its
               ability to perform its obligations under this Agreement;

       20.1.3  the Affected Parry shall make all reasonable efforts to mitigate
               the effects of the Force Majeure Event on the performance of its
               obligations under this Agreement; and

       20.1.4  immediately after the end of the Force Majeure Event, the
               Affected Party shall notify the other party in writing that the
               Force Majeure Event has ended, the duration of the Force Majeure
               Event, and shall resume performance of its obligations under this
               Agreement.

20.2   As soon as reasonably practicable and in any event within 48 hours
       following notification by CTI of a Force Majeure Event CTI shall develop
       and provide to BDB an outline plan of action for overcoming the Force
       Majeure Event and a timetable for implementation thereof for
       consideration by BDB. If such plan is acceptable to BDB, CTI shall
       proceed to implement such plan provided that BDB may terminate this
       Agreement by giving not less than 10 days written notice if such plan is
       not successfully implemented so as to end the Force Majeure Event within
       the timescales agreed. If the parties fail to agree an outline plan or
       CTI fails to meet the said agreed

                                       37
<PAGE>
 
       timescales the parties shall, through the Change Control Procedure and
       subject to regulatory consents, attempt to agree to vary the Services and
       the Charges, and in default of such agreement within such timescales as
       BDB shall reasonably determine then BDB shall be entitled to terminate on
       30 days prior written notice.

21.    LIABILITY AND INSURANCE

21.1   Each party shall maintain appropriate insurance against any loss,
       damages, claims or actions arising out of the performance by it of its
       obligations under this Agreement from:

       21.1.1  personal injury or death;

       21.1.2  public liability; and/or

       21.1.3  any other liability for which either is required by law to
               insure.

21.2   Service Credits shall be payable by CTI in the manner calculated as set
       out in Schedule 7.

21.3   BDB's entitlement to Delay Rebate and Service Credits of all Stations in
       any twelve month period shall not exceed [*] in aggregate. For the
       avoidance of doubt, nothing in this Clause 21.3 shall prevent BDB from
       claiming damages in respect of any breach of this Agreement which might
       otherwise have given rise to an entitlement to a Delay Rebate or Service
       Credits.

21.4   CTI's total aggregate liability in respect of all claims made under or in
       connection with this Agreement (including Services Credits and Delay
       Rebates) arising out of any event or series of events in any Year will be
       limited to an aggregate amount equal to [*] as set out in Schedule 2
       Table 1, whether such liability arises in contract, tort, negligence,
       misrepresentation, breach of statutory duty or otherwise howsoever.

21.5   CTI shall not be liable to BDB for loss of profits or for any indirect,
       special, incidental or consequential loss whatsoever arising out of its
       performance of or failure to perform this Agreement, whether in contract,
       tort, negligence, misrepresentation, breach of statutory duty or
       otherwise howsoever.

21.6   Nothing in this Agreement shall exclude CTI's liability for death or
       personal injury caused by its negligence.

21.7   BDB shall not be liable to CTI for loss of profits or for any indirect,
       special, incidental or consequential loss whatsoever arising out of its
       performance of or failure to perform this Agreement, whether in contract,
       tort, negligence, misrepresentation, breach of statutory duty or
       otherwise howsoever provided that this Clause 21.7 is not intended to and
       shall not operate to deprive CTI of damages calculated on the basis of

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      38
<PAGE>
 
       the revenue it would have earned from BDB under this Agreement but for a
       breach by BDB of this Agreement.

21.8   Nothing in this Agreement shall exclude BDB's liability for death or
       personal injury caused by its negligence.

22.    ASSIGNMENT AND SUB-CONTRACTING

22.1   This Agreement is personal to the parties hereto and neither may assign,
       transfer, charge or deal in any other manner with this Agreement other
       than as expressly set out below except that CTI shall be entitled to
       assign its rights to payments under this Agreement by way of security to
       any person providing finance to it or to any member of its Group subject
       to receiving BDB's prior written consent (such consent not to be
       unreasonably withheld).

22.2   Each of CTI and BDB shall be entitled to assign this Agreement to any
       wholly-owned subsidiary provided that:

       22.2.1  the transferor procures that the transferee is bound by a direct
               covenant with the other party to observe all the terms of this
               Agreement and the obligations of the transferor contained in this
               Agreement if the transferee were a party to this Agreement; and

       22.2.2  if any transferee ceases to be a wholly-owned subsidiary of the
               transferor, this Agreement will be transferred back to the
               transferor, or to a wholly-owned subsidiary of the transferor.

22.3   BDB may on notice to CTI assign this Agreement to any person holding a
       valid licence to provide multiplex services over the BDB Multiplexes
       providing that the proposed assignee enters into an legally binding
       covenant with CTI to be bound by and perform the obligations of BDB under
       this Agreement from the date of the assignment as if the assignee were
       party to this Agreement in place of BDB.

22.4   CTI may, with BDB's prior written consent, sub-contract any of its
       obligations under this Agreement (such consent not to be unreasonably
       withheld) providing that CTI procures that the sub-contractor complies
       with CTI's obligations under this Agreement as if it were a party to this
       Agreement in place of CTI. Nothing in this Clause 22.4 will relieve CTI
       of any of its liabilities or obligations under this Agreement.

23.    INFORMATION AND CONFIDENTIALITY

23.1   Each party agrees and undertakes that during the Term, and thereafter, it
       will keep confidential and will not use for any purposes other than as
       contemplated in this Agreement or, without the prior written consent of
       the other, disclose to any third party the terms of this Agreement or any
       information of a confidential nature which is supplied to it under this
       Agreement or of which it becomes aware in the performance of this
       Agreement unless:

                                       39
<PAGE>
 
       23.1.1  such information is required to be disclosed to the respective
               financiers of CTI or BDB, to members of their respective Groups
               or their shareholders, subject in each case to such companies or
               individuals agreeing that the information shall be confidential
               in terms substantially similar to this Clause 23.1;

       23.1.2  such information is public knowledge, or subsequently becomes
               public knowledge, other than by breach of this Agreement;

       23.1.3  such information subsequently comes lawfully into the possession
               of the party in question from a third party; or

       23.1.4  the disclosure of such information is required pursuant to law,
               by any court of competent jurisdiction or any regulatory
               authority, including any recognised stock exchange or any
               taxation authority.

23.2   To the extent that it is necessary to disclose confidential information
       pursuant to the provisions of this Clause 23.2 or otherwise as is
       necessary to implement the provisions of this Agreement, either party may
       disclose any confidential information concerning this Agreement to its
       employees, agents, professional advisers or authorised sub-contractors on
       a "need-to-know basis"; provided that before any such disclosure such
       party shall make such persons aware of its obligations of confidentiality
       under this Agreement and shall at all times procure compliance by such
       persons with these obligations of confidentiality as if they were party
       to their Agreement.

23.3   CTI may not refer to this Agreement in any publicity or advertising
       material without first obtaining BDB's written consent.

24.    NOTICES

24.    Any notice to be served by either party shall be in writing and shall be
       sent to the following addresses:

       CTI:    Chief Executive Officer
               CTI
               Warwick Technology Park
               Gallows Hill
               Heathcote Lane
               Warwickshire CN34 6TN
               Fax No: 01926 416026

               Copy to: Nick Davies
               CTI
               Warwick Technology Park

                                       40
<PAGE>
 
               Gallows Hill
               Heathcote Lane
               Warwickshire CN34 6TN

     BDB:      Director of Operations
               British Digital Broadcasting
               c/o 25 Knightsbridge
               London SWIX 7RZ
               Fax No: 0171 663 6330

               Copy to: Company Secretary
               British Digital Broadcasting
               c/o 25 Knightsbridge
               London SWIX 7RZ
               Fax No: 0171 663 6330

24.2  Any notice, invoice or other document which may be given by either party
      under this Agreement will be deemed to have been duly given if left at or
      sent by post (whether by letter or, where the parties agree in writing, in
      any other form) or facsimile transmission to the address and fax numbers
      to any other address or fax number to each other in writing in accordance
      with this Clause as an address to which notices, invoices and other
      documents may be sent. Any such communication will be deemed to have been
      made to the other party:

      24.2.1  if sent by hand, when delivered;

      24.2.2  if sent by post, 48 hours after the envelope containing such
              notice was posted; or

      24.2.3  if sent by facsimile, when the transmission of the facsimile is
              confirmed delivered complete, if delivered on a Business Day, or,
              if not, at 9.30 a.m. (British Standard Time) on the next Business
              Day following transmission.

24.3  It is further agreed that notices sent by facsimile will also be confirmed
      by sending a signed copy by hand or by post, the copy to be posted or
      delivered within 24 hours of sending the facsimile.

25.   [*]

25.1  [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      41
<PAGE>
 
25.2  [*]

25.3  [*]

25.4  [*]

25.5  [*]

25.6  [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      42
<PAGE>
 
25.7  CTI shall operate this Agreement in good faith.

26.   RESTRICTIVE TRADE PRACTICES

26.1  If there are provisions of this Agreement (or of an agreement, or
      arrangement of which it forms part) by virtue of which particulars of this
      Agreement (or of an agreement of which it forms part) are, at the date of
      this Agreement required to be furnished to the Director General of Fair
      Trading under the Restrictive Trade Practices Acts 1976-1977:

      26.1.1  The parties shall ensure that those particulars are furnished as
              soon as possible and in any event within the time specified by
              those Acts; and

      26.1.2  Those provisions do not take effect until the day after those
              particulars have been furnished.

27.   GENERAL

27.1  The failure to exercise or delay in exercising a right or remedy provided
      by this Agreement or by law does not constitute a waiver of the right or
      remedy or a waiver of any other right or remedy. No single or partial
      exercise of a right or remedy provided by this Agreement or by law
      prevents further exercise of the right or remedy or the exercise of
      another right or remedy.

27.2  A variation or amendment of this Agreement is valid only if it is made in
      writing and signed by or on behalf of each party.

27.3  Except where this Agreement provides otherwise, the rights and remedies
      contained in this Agreement are cumulative and not exclusive of any rights
      or remedies provided by law.

27.4  A party has no authority or power to bind, to contract in the name of, or
      to create a liability for the other party in any way or for any purpose.

27.5  This agreement together with the Equipment Purchase Agreement between
      Granada Group PLC, Carlton Communications pie and Castle Transmission
      International Ltd of even date herewith supersedes any previous written or
      oral agreement between the parties in relation to the matters dealt with
      in this Agreement including the

                                       43
<PAGE>
 
      Memorandum of Understanding dated 4th August 1997 and, together with the
      Schedules and Annexures and any document incorporated by reference herein,
      contains the whole agreement between the parties relating to the subject
      matter of this Agreement.

27.6  The invalidity or unenforceability of any individual provision(s) of this
      Agreement shall not affect any other provision herein or render this
      Agreement invalid or unenforceable.

27.7  This Agreement is made between principals and shall not be deemed to
      create any partnership between the parties and neither party shall hold
      itself out as agent or partner of the other except as specifically
      contemplated under this Agreement.

27.8  In the event of any inconsistency between the general provisions of this
      Agreement and any of the provisions contained in any of the Schedules,
      attachments, annexures to it or to documents or agreements referred to in
      this Agreement, the provisions of this Agreement shall take precedence.

28.   VALUE ADDED TAX

28.1  All sums due to either party under this Agreement are exclusive of VAT
      thereon, if any, which shall be charged in addition thereto in accordance
      with the relevant law in force at the time of making the relevant taxable
      supply and shall be payable by the paying party only against receipt from
      the other of a valid VAT invoice in respect thereof.

28.2  Where under this Agreement one party has agreed to reimburse or indemnify
      the other in respect of any payment made or cost incurred by the other,
      then the first party shall also reimburse any VAT paid by the other which
      forms part of its payment or costs incurred to the extent that such VAT is
      not available for credit for the other (or for the representative member
      of the other's VAT group) under sections 25 and 26 of the Value Added Tax
      Act 1994 (or any replacement or equivalent provision).

29.   JURISDICTION

      This Agreement will be governed by and construed and interpreted in
      accordance with English law, and the parties hereby submit to the
      exclusive jurisdiction of the English courts.

30.   COUNTERPARTS

      This Agreement may be executed in any number of counterparts each of which
      when executed and delivered is an original, but all the counterparts
      together constitute the same document.

                                       44
<PAGE>
 
                                  SCHEDULE 1

                           CHANGE CONTROL PROCEDURE

PART I - CHANGES PROPOSED BY CTI

1.   If CTI proposes any changes to this Agreement or any of the Services then
     CTI must submit to BDB a document (a "CHANGE REPORT") describing the
     suggested changes, and detailing:

     1.1  the reason for the proposed change;

     1.2  any impact the change may have on the timing for provision of any
          Services under this Agreement and whether, for example, but without
          limitation, it will have an effect on any Ready for Service Date and
          Start of Service Date;

     1.3  any impact the change would have on the costs of implementing and
          providing the Services and the Charges payable under this Agreement;

     1.4  a description of the benefits that the change would make to the
          provision of the Services, if any; and

     1.5  any other changes that would be required to any aspect of this
          Agreement if the change were implemented.

2.   Within 10 Business Days of receipt by BDB of a notice under paragraph 1,
     BDB and CTI shall discuss in good faith the proposed change with a view to
     agreeing whether to amend this Agreement. Pending an agreed change this
     Agreement shall continue unamended.

3.   CTI shall nominate a representative who will act as a single point of
     contact, and take responsibility for progressing change requests whether
     made by CTI or BDB.

PART II - CHANGES PROPOSED BY BDB

4.   If BDB at any time proposes changes to this Agreement or the Services then:

     4.1  Within 20 Business Days of receipt of a notice from BDB proposing a
          change, CTI must submit to BDB a Change Report detailing the matters
          set out in paragraphs 1.1 to 1.5 of Part I of this Schedule.

     4.2  Within 10 Business Days of receipt by BDB of a Change Report under
          paragraph 4.1 of Part II of this Schedule, the parties shall discuss
          in good faith

                                       45
<PAGE>
 
          the proposed change with a view to agreeing whether to amend this
          Agreement. Pending an agreed change this Agreement shall continue
          unamended.

     4.3  All change requests must be authorised by the BDB Director of
          Operations or his nominee from time to time notified to CTI.

                                       46
<PAGE>
 
                                  SCHEDULE 2

                                  THE CHARGES


PART I - SCHEDULE OF CHARGES

<TABLE>
<CAPTION>
                         TRANSMISSION             TOTAL CHARGES
YEAR        [*]        SERVICES' CHARGES

            [*]         (Pounds)000S             (Pounds)000S
<S>         <C>        <C>                       <C> 
 1997       [*]                   [*]                       [*]    

 1998       [*]                   [*]                       [*]    

 1999       [*]                   [*]                       [*]    

 2000       [*]                   [*]                       [*]    

 2001       [*]                   [*]                    19,285      

 2002       [*]                   [*]                    19,307      

 2003       [*]                   [*]                    19,310      

 2004       [*]                   [*]                    19,314      

 2005       [*]                   [*]                    19,317      

 2006       [*]                   [*]                    19,321      

 2007       [*]                   [*]                    19,324      

 2008       [*]                   [*]                    19,732      

 2009       [*]                   [*]                       [*]    

 2010       [*]                   [*]                       [*]    

TOTAL       [*]                   [*]                       [*]     
</TABLE>

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      47
<PAGE>
 
PART II -  ANNUAL RPI INCREASES

The Charges set out in Part I of this Schedule (the "UNADJUSTED CHARGES") are
shown before the effect of increases calculated in accordance with this Part II.

With effect from each anniversary of 1 January 1998 (the "REVIEW DATE") the
Unadjusted Charges shall be subject to RPI review and shall be increased by an
Adjustment Factor as set out below.

An "ADJUSTMENT FACTOR" is calculated for each calendar year starting with a
value of 1 on 1 January 1998. The Adjustment Factor for the year commencing at
each Review Date is calculated by increasing the Adjustment Factor for the
previous calendar year by the Adjusted Rate of Inflation (as defined below). The
Charges for the current calendar year are calculated by multiplying the figure
for the Unadjusted Charges in respect of that year set out in Part I of this
Schedule by the Adjustment Factor.

The "ADJUSTED RATE OF INFLATION" shall be calculated by [*] the Rate of
Inflation.

The "RATE OF INFLATION" shall be calculated as follows:

Rate of Inflation   =    A - B  x  100   (shown as a percentage amount)
                         -----
                           B
 
Where  A  =   RPI at 31 December, immediately prior to the Review Date
 
       B  =   RPI at 31 December, 12 months preceding the Review Date
 
All the above can be written as a formula:

Current year Charges  =  Unadjusted Charge set out in Part I of this Schedule x
                         Adjustment Factor

where:

Adjustment Factor     =

Adjustment Factor for previous calendar year  x  (1 + A - B  [*])
                                                      -----       
                                                        B

and

Adjustment Factor for the first calendar year of the Term = 1

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      48
<PAGE>
 
In the event that RPI is reset or no longer published, the above calculation
will be replaced with an equivalent formula which will result in the same
Adjusted Rate of Inflation as would have been achieved had the RPI remained
available or not been reset as the case may be.

If in recalculating the Charges prior to the 5/th/ Anniversary of 1 January 1998
the Rate of Inflation shall exceed [*], but shall not exceed [*], then [*] shall
be deemed to be the Rate of Inflation for the purposes of calculating the
Charges for the year in question. If in such recalculation of the Charges, the
Rate of Inflation shall exceed [*] then the parties shall renegotiate in good
faith and on an open book basis the [*] deemed Maximum Rate of Inflation to be
applied in calculating the relevant Charges.


PART III - [*]

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      49
<PAGE>
 
[*]

PART IV - THE CONTINGENCY

The Charges have been calculated with the inclusion of an amount of [*] (the
"CONTINGENCY AMOUNT").

The Contingency Amount is intended to be utilised by CTI in defraying unforeseen
or increased costs to the extent that such increased or unforeseen costs have
not be defrayed by CTI from savings pursuant to Clause 17.7. If by a date
falling three months after the last Station comes into Operational Service
(excluding any Additional Stations, unless otherwise agreed by the Parties)
there shall remain unutilised any balance of the Contingency Amount in respect
of any identified category of expenditure, the balance shall be utilised to
provide a

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      50
<PAGE>
 
reduction in the Charges in a manner to be agreed between the parties failing
which it will be set off against the charges pro-rata for the remainder of the
Term.


PART V - BASIS OF CHARGING [*]


PART VI - THE WTA LICENCE FEE

To the extent that any licence fees are payable by CTI in respect of any WTA
Licences relating solely to the operation of the BDB Multiplexes:

1.1  shall exceed [*] per annum per BDB Multiplex then the Charges in respect of
     the year in which the WTA Licence fee is payable shall be increased by an
     amount equal to that excess; or

1.2  fall short of [*] per annum in the first full year following the last
     Station coming into Operational Service (excluding any Additional Stations,
     unless otherwise agreed by the parties) or any subsequent year in which the
     WTA Licence fee is payable per BDB Multiplex then the Charges in respect of
     that year that shall be reduced by an amount equal to the shortfall.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      51
<PAGE>
 
                    SCHEDULE 3 CONFIGURATION OF THE NETWORK

PART I - DISTRIBUTION

Multiplex distribution provides resilient terrestrial circuits from the
Multiplex Centre to each of the 81 transmitting stations.

The circuits will be provided by BT on behalf of CTI, and will comprise
diversely routed dual fibre circuits carrying three multiplexes to BT network
access points. At these access points the BDB signals will be combined with
those from other DTT multiplex operators for onwards delivery via a common
network.

Interfaces will be provided at the Multiplex Centre to enable transport streams
with different programming to be fed independently to six "macro regions". This
facility will be provided for multiplexes B, C and D. The Stations within each
macro region will be as for Multiplex 2 unless otherwise agreed by the parties
through the Change Control Procedure.

NETWORK TECHNOLOGY & RESILIENCE

Terrestrial circuits will be designed to provide availabilities of 99.99%
through the use of optical fibre circuits. This diversity will be maintained
throughout the network, such that there are no common points of failure. At a
few of the very remote sites, where the provision of dual optical fibre paths is
not practicable, service may be provided on duplicated digital radio links,
engineered to the same level of availability.

The network will consist of circuits providing connectivity from the local BT
network nodes to the transmitter sites. These circuits will be provided
specifically for this purpose on dedicated optical fibres. To maintain
resilience upon the failure of a single incoming circuit, the line-termination
plant will be configured to provide 'cross protection', such that upon the
failure of one incoming circuit, the remaining diverse feed will feed both
halves of the core network or transmitter input equipment.

A core national network, providing interconnection between the BT nodes, will be
provided on existing BT digital line plant using SDH technology. The automatic
re-routing capabilities of BT's SDH network will ensure that full diversity is
restored automatically should any individual element of the core network fail.

TOPOLOGY

Although a common delivery network will be utilised, aggregation with other
broadcasters signals will be carried out at BT network nodes, and BDB's signals
will not be routed via any other broadcasters premises. The multiplexes, as
originated from the Multiplex Centre, will be delivered to each of the primary
sites listed below. Where any secondary Sites are shown these will be fed via
the primary Sites, from the output of the SI processing equipment.

                                       52
<PAGE>
 
       SCHEDULE 3 - TABLE 1; SI Processing Primary and Secondary Stations
       ------------------------------------------------------------------


<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------
   PRIMARY SITE                                  SECONDARY SITES
- ---------------------------------------------------------------------------------------------
<S>                 <C>
Belmont             None
- ---------------------------------------------------------------------------------------------
Bilsdale            None
- ---------------------------------------------------------------------------------------------
Black Hill          Rosneath, Darvel, Torosay.
- ---------------------------------------------------------------------------------------------
Bluebell Hill       Dover.
- ---------------------------------------------------------------------------------------------
Caldbeck            None
- ---------------------------------------------------------------------------------------------
Caradon Hill        Plympton.
- ---------------------------------------------------------------------------------------------
Craigkelly          None
- ---------------------------------------------------------------------------------------------
Crystal Palace      Reigate, Guildford, Hemel Hempstead.
- ---------------------------------------------------------------------------------------------
Divis               Limavady, Brougher Mountain.
- ---------------------------------------------------------------------------------------------
Durris              Angus, Knockmore, Rosemarkie, Eitshal, Rumster Forest, Kellylang Hill,
                    Bressay.
- ---------------------------------------------------------------------------------------------
Emley Moor          Idle, Keighly, Oliver's Mount.
- ---------------------------------------------------------------------------------------------
Fremont Point       None
- ---------------------------------------------------------------------------------------------
Hannington          None
- ---------------------------------------------------------------------------------------------
Heathfield          Hastings.
- ---------------------------------------------------------------------------------------------
Huntshaw Cross      None
- ---------------------------------------------------------------------------------------------
Mendip              Ilchester Crescent, Kings Weston Hill.
- ---------------------------------------------------------------------------------------------
Midhurst            Whitehawk Hill.
- ---------------------------------------------------------------------------------------------
Oxford              None
- ---------------------------------------------------------------------------------------------
Pontop Pike         Fenham, Chatton.
- ---------------------------------------------------------------------------------------------
Redruth             None
- ---------------------------------------------------------------------------------------------
Ridge Hill          None
- ---------------------------------------------------------------------------------------------
Rowridge            Salisbury.
- ---------------------------------------------------------------------------------------------
Sandy Heath         None
- ---------------------------------------------------------------------------------------------
Selkirk             None
- ---------------------------------------------------------------------------------------------
Sheffield           Chesterfield.
- ---------------------------------------------------------------------------------------------
Stockland Hill      Beacon Hill.
- ---------------------------------------------------------------------------------------------
Sudbury             None
- ---------------------------------------------------------------------------------------------
Sutton Coldfield    Fenton, The Wrekin, Bromsgrove, Brierley Hill, Malvern, Larkstoke.
- ---------------------------------------------------------------------------------------------
Tacolneston         None
- ---------------------------------------------------------------------------------------------
Tunbridge Wells     None
- ---------------------------------------------------------------------------------------------
Waltham             Nottingham.
- ---------------------------------------------------------------------------------------------
Wenvoe              Pontypool, Aberdare, Kilvey Hill, Carmel, Presely, Blaenplwyf,
                    Llanddona, Moel-y-Parc.
- ---------------------------------------------------------------------------------------------
Winter Hill         Lancaster, Pendle Forest, Storeton, Saddleworth.
- ---------------------------------------------------------------------------------------------
</TABLE>

The transmitter input system at the secondary sites will consist only of
duplicated COFDM modulators since the incoming transport stream will contain the
correct SI information from the associated primary station.

                                       53
<PAGE>
 
NETWORK MONITORING AND MANAGEMENT

The service will be provided as a fully managed network and CTI will have on-
line access to the BT network management system providing details of the network
status. This will allow rapid fault diagnosis and escalation, together with
reporting to BDB as provided in Clause 14.

At the BDB Interface, BDB's multiplex streams will be tagged with a unique
identification header, which will remain with the stream until the final point
of delivery. This will enable the terminating equipment to ensure that the
correct BDB stream is being delivered to the transmitters at all times, and take
appropriate executive action in the case of any equipment faults or
configuration errors.

                                       54
<PAGE>
 
PART II - [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      55
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      56
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      57
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      58
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      59
<PAGE>
 
      SCHEDULE 3 - TABLE 2  LIST OF STATIONS WITH SINGLE COMBINING SYSTEMS


<TABLE>
<CAPTION>
- --------------------------------------------------------
Station                       Affected BDB Multiplex(es)
- --------------------------------------------------------
<S>                           <C>
- --------------------------------------------------------
Aberdare                      [*]
- --------------------------------------------------------
Brierley Hill                 [*]
- --------------------------------------------------------
Bristol Ilchester Crescent    [*]
- --------------------------------------------------------
Bromsgrove                    [*]
- --------------------------------------------------------
Fenham                        [*]
- --------------------------------------------------------
Fenton                        [*]
- --------------------------------------------------------
Hastings                      [*]
- --------------------------------------------------------
Larkstoke                     [*]
- --------------------------------------------------------
Malvern                       [*]
- --------------------------------------------------------
Olivers Mount                 [*]
- --------------------------------------------------------
Salisbury                     [*]
- --------------------------------------------------------
Tunbridge Wells               [*]
- --------------------------------------------------------
Whitehawk Hill                [*]
- --------------------------------------------------------
Chesterfield                  [*]
- --------------------------------------------------------
Idle                          [*]
- --------------------------------------------------------
Lancaster                     [*]
- --------------------------------------------------------
Nottingham                    [*]
- --------------------------------------------------------
Pendle Forest                 [*]
- --------------------------------------------------------
Plympton                      [*]
- --------------------------------------------------------
Rosneath                      [*]
- --------------------------------------------------------
Saddleworth                   [*]
- --------------------------------------------------------
</TABLE>

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      60
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      61
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      62
<PAGE>
 
STRUCTURAL ENGINEERING

Either new structures will be provided for DTT antennas or existing structures
will be strengthened where necessary to accept additional load.

BUILDING

New or modified buildings will be provided to accommodate the equipment for all
multiplex operators.

At each Station other than those referred to below, each multiplex operator's
plant will be housed in a discrete area, classed as an independent fire cell for
isolation, with secure access via a common corridor shared with the other
operators.

At the following Stations all multiplex operators equipment will be housed in
secure housing separate from other transmission equipment: Aberdare, Brierley
Hill, Bristol Ilchester Crescent, Bristol Kings Weston, Bromsgrove,
Chesterfield, Fenham, Fenton, Guildford, Hastings, Hemel Hempstead, Idle,
Keighley, Lancaster, Larkstoke, Malvern, Nottingham, Olivers Mount, Plympton,
Pontypool, Reigate, Rosneath, Saddleworth, Salisbury, Sheffield, Storeton,
Tunbridge Wells, Whitehawk Hill.

At Crystal Palace multiplex B shall be housed in an independent fire cell,
multiplexes C and D shall be housed together in an otherwise independent fire
cell. At Rowridge, Multiplexes B, C and D shall be housed together in an
otherwise independent fire cell.

POWER

All DTT Stations will have dual electricity supplies, except for those listed in
the table below:

         SCHEDULE 3 - TABLE 3 : Stations with Single Power Supply Feeds
         --------------------------------------------------------------

- ------------------------------------------------------------------------------
Aberdare                      Eitshal          Kilvey Hill     Pontypool
- ------------------------------------------------------------------------------
Bilsdale                      Fenham           Knockmore       Reigate
- ------------------------------------------------------------------------------
Bressay                       Fenton           Lancaster       Rosneath
- ------------------------------------------------------------------------------
Brierley Hill                 Fremont Point    Larkstoke       Saddleworth
- ------------------------------------------------------------------------------
Bristol Ilchester Crescent    Guildford        Llanddona       Salisbury
- ------------------------------------------------------------------------------
Bristol Kings Weston          Hastings         Malvern         Storeton
- ------------------------------------------------------------------------------
Bromsgrove                    Hemel Hempstead  Nottingham      Torosay
- ------------------------------------------------------------------------------
Brougher Mountain             Idle             Oliver's Mount  Tunbridge Wells
- ------------------------------------------------------------------------------
Chatton                       Keelylang Hill   Pendle Forest   Whitehawk Hill
- ------------------------------------------------------------------------------
Chesterfield                  Keighley         Plympton
- ------------------------------------------------------------------------------

CTI will install new DTT auto-start, auto-changeover diesel generators at all
stations. These will be containerised where planning regulations allow and will
have sufficient fuel for a minimum of 24 hours full-power operation.

Duplicate power distribution will provide resilience for fault conditions or
maintenance activity.

                                       63
<PAGE>
 
UPS units will be provided to protect individual key items of equipment within
the transmitter input system as appropriate.

                                       64
<PAGE>
 
                    SCHEDULE 3 CONFIGURATION OF THE NETWORK

PART  IIA - SI DATA INTERCHANGE

SYSTEM REQUIREMENTS

It is specified in the D Book that 'each multiplex must carry certain SI
information for certain other multiplexes', in particular Event Information
Table entries.

[*]

Where the regional SI permutation is appropriate to other Sites in the locality,
the modified transport streams will be delivered onwards to those Sites via the
Distribution Network.

SYSTEM OVERVIEW

[*]

All of the acquired SI, along with the SI relating to the BDB multiplex, will be
collated and reinserted into the outgoing transport stream.

The SI Collation System ("SICS") will be configured to ensure that appropriate
bit-rate will be apportioned to the 'Other multiplex' table data within the
stream in accordance with the recommendations of the D-Book ("GUARANTEED
BANDWIDTH"). The SICS will also ensure that the incoming 'Other multiplex' data
conforms to 'D' Book technical standards ("QUALIFYING DATA"), rejecting data as
necessary to ensure the integrity of the 'Actual' multiplex.

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      65
<PAGE>
 
[*]

EQUIPMENT SUPPLIER

The Charges in Schedule 2 are based on the use of Phillips equipment to provide
SI and related functions. If BDB does not chose Phillips as its system
integrator then it may not be appropriate to use Phillips equipment and the
Charge Control Procedure shall apply.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      66
<PAGE>
 
                    SCHEDULE 3 CONFIGURATION OF THE NETWORK

PART III - MONITORING AND CONTROL


The Network has been designed for unattended operation. CTI will use automatic
monitoring facilities at all Stations as a means of measuring compliance with
the technical performance parameters of the DTT Transmission Service.

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      67
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      68
<PAGE>
 
                    SCHEDULE 3 CONFIGURATION OF THE NETWORK

PART IIIA - NETWORK STATUS SYSTEM

A Network Status System will be provided to BDB to display the current status of
the Network.

A dedicated Kilostream circuit will be provided from the TOC to the BDB
Multiplex Centre. A personal computer and network equipment will also be
supplied as part of the Network Status System.

The following diagram outlines the proposed system:

[Diagram illustrating the configuration of the BDB network]

APPLICATION

An application, based upon a graphical user interface, will be supplied to
access the database and provide a graphical overview of the Network, as well as
showing more detail on individual Stations when required.

A dedicated database will be provided to hold a subset of the alarm and current
status of all the DTT transmitting stations. This status database will be kept
to within thirty seconds of the status that is known at the TOC system. The
database will also hold service messages for at least the preceding 18 months.
These can be used for ad-hoc queries and service level confirmation.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
                          
                                      69
<PAGE>
 
SERVICE LEVEL

The data circuit, database and graphical user interface application will form
part of the Service and will be the responsibility of CTI. The monitoring of
this circuit and PC will be incorporated into the TOC system and a watchdog
system will be used to ensure that any loss of the monitoring facility is
detected.

Throughout the life of the system CTI will make all reasonable endeavours to
ensure compatibility with current industry-standard operating systems.

SECURITY

CTI will provide suitable systems to protect the networks of both organisations.
This will include electronic firewalls on the telecommunications links and virus
checking on the BDB Network Status system computer.

BDB will need to maintain the physical security for the system to protect it
against local attack.

FUNCTIONAL DESIGN

A detailed functional design specification for the Network Status System will
ensure that any reasonable requirements of BDB are met within the constraints of
the CTI TOC system.

                                       70
<PAGE>
 
                                  SCHEDULE 4

                           SERVICES PROVIDED BY CTI

GENERAL

QUALITY

CTI's operation is governed by a quality management system that is accredited to
ISO 9001.

As far as possible, CTI expects suppliers to operate under similar quality
arrangements.

CTI staff are chosen with appropriate skills and are kept up to date with
training, as needed, in new techniques and systems.

SAFETY

CTI's internal Safety Policy (the "Safety Policy") fulfils the company's legal
requirement under the Health and Safety at Work Act 1974.

The Safety Policy is carried out through a series of Company Safety Instructions
under the auspices of a full-time Company Safety Adviser (CSA).

All staff receive relevant training to carry out their jobs in accordance with
the Safety Policy. Such training is under continual review.

PART I - DESIGN AND PROCUREMENT

PROJECT MANAGEMENT

The following personnel am responsible for provision of the Network:

     Principal Account Manager:

     .    acts as primary point of contact between BDB and CTI for both Project
          and Service delivery issues.

     Project Manager:

     .    responsible for provision of Network infrastructure; and
     .    co-ordinates inter-site and on-site activities of project
          contributors.

     Technical Manager:

     .    ensures technical compatibility of Network elements; and
     .    ensures, compatibility of the Service with customer and industry
          expectations.

                                       71
<PAGE>
 
Project schedules will be created and maintained under review for each site an
which there is project work in progress. From these a 'super-project' plan will
be maintained to co-ordinate intrasite activities.

The Project Manager will have direct access to all the relevant Resource Heads
to ensure provision of relevant resources.

Project meetings and systems architecture meetings will be hold regularly to
ensure cross-specialism, co-ordination and compatibility.

PROGRESS REPORTING

CTI will present a two weekly progress report to BDB. This report to will be in
the form of a project schedule. This will be in a software format compatible
with the project planning system used by BDB.

There will in addition be a brief narrative highlighting the main issues
associated with particular activities or sites.

RISK

CTI's risk management principles are encompassed in CTI's quality procedures.
The discipline is based on risk identification, analysis, mitigation and
management as an iterative process. This process will be managed by the Project
Manager and the Technical Manager.

PART II - OPERATIONS

SERVICE DELIVERY

Delivery of the service will be the responsibility of the Head of Operations,
who is:

     .    responsible for provision of an effective operations and maintenance
          system nation wide; and
     .    responsible for ensuring service level provision compliant with
          relevant contractual requirements.

TECHNICAL OPERATIONS CENTRE (TOC)

CTI has in place a TOC and this is the hub of CTI's network operations,
monitoring and management capability. It offers a full 24 hour, 365 day facility
staffed by specialist technical, managerial and operational staff. The TOC back-
up site at Sutton Coldfield provides technical resilience and geographical
separation.

Provision of a 24-hr TOC operation is the responsibility of the TOC Manager, who
ensures that TOC procedures are commensurate with service level provision.

The TOC will be equipped with the following systems:

                                       72
<PAGE>
 
 .    a supervisory control and dam acquisition system (SCADA);

 .    a management information system (MIS) and wide area private data network;

 .    a wide area networked maintenance personnel despatch system;

 .    a Network Status System; and

 .    a standby power supply system with diesel generator and UPS.

The transmitting stations will operate unattended with remote monitoring fully
integrated into the TOC. The TOC will initiate operational response to potential
and service-affecting faults in accordance with the provisions of Schedule 9 and
the Contracted Availability. The required operational support will be supplied
from one of a number of team bases which are located at various points
throughout the UK.

Alarm from the DTT monitoring equipment will arrive in the TOC and priorities
will be automatically assigned. In addition suspected problems may be reported
to the TOC from other sources. All such occurrences will be recorded and dealt
with accordingly via a pre-defined escalation procedure.

The TOC will provide operational information and statistics to meet the
performance monitoring and reporting requirements set out in Clause 14.

REMOTE CONTROL

The Duty Engineer or nominated deputy Engineer will be the only persons in the
TOC authorised to Initiate any control action.

CTI TEAM BASE MONITORING

All team bases will be equipped with receive systems for DTT. They will be able
to check (on an ad-hoc basis), the output from those stations which are
receivable at that base.

TV DEALER MONITORING

The TOC has an existing network of TV dealer contacts that are used to confirm
TV and radio reception and this facility will be extended for DTT reception
where practicable.

VIEWER MONITORING

At least one nominated audience contact for each DTT station will have direct
telephone access to the TOC to enable reporting of suspected problems and to
allow the TOC to contact them to confirm problems reported from another source.

PART III - MAINTENANCE

FAULT REPAIR AND RECORDING

                                       73
<PAGE>
 
The first priority of maintenance staff will be to ensure that the service is
restored. The next priority will be to restore system redundancy by repairing
reserve or standby equipment. Fault rectification will usually be by replacement
of faulty units or modules.

Fault repair down to component level will usually be done at Daventry (see
below).

A database of fault history will be maintained to identify any trends with a
view to improving system reliability.

ROUTINE MAINTENANCE

Any necessary routine maintenance will be carried out by maintenance staff on an
"as necessary" basis. The frequency of such work will be determined by condition
monitoring and analysis of the database of fault history.

Routine maintenance will be planned in such a way that the outgoing service is
unaffected by the activity. Any work which is service-affecting will be carried
out under the Planned Work regime (below).

PLANNED WORK

The number of DTT channels sharing antenna systems will make planned outages and
switching breaks more difficult to negotiate in future. Antennas shared between
analogue and digital services present even greater difficulty.

CTI are committed to the formulation of an agreed CTI/NTL rolling 12 month
planned work programme for structural maintenance. To that end a formalised
negotiation method is proposed within the following guidelines:

 .    ensure that a clear need for the work to be done can be shown;

 .    parallel negotiations between identified points of contact within each
     organisation to minimise the time taken to reach agreement;

 .    a rotating 'veto' system, ensuring fair and equitable treatment of all
     requests:

 .    agree with each operator those programme periods that they regard as
     highest priority; and

 .    equalisation of the effects of planned work on all services at a
     particular station.

DAVENTRY CENTRAL MAINTENANCE FACILITIES

CTI has a central maintenance and supply facility at Daventry which operates on
the following principles:-

 .    repair of equipment down to component level.

 .    work is done under controlled conditions by experienced staff; and

                                       74
<PAGE>
 
 .    a central store of spare units and parts is maintained to support field
     requirements.

It provides additional support including a fast turn-around modular repair
service, parts purchasing, a spares control/delivery system and a test equipment
calibration service.

SPECIALIST SUPPORT

The existing callout procedure will be expanded to include out of hours support
for maintenance teams.

An escalation procedure will ensure that an appropriate level of support is
available for all incidents. This will be implemented via the TOC which will
maintain a schedule of engineers who have specialised knowledge of nominated
systems and equipment used in the Network. These engineers will come from CTI's
Operations and Engineering departments as well as external organisations
contracted to provide support where necessary. The escalation procedure will
include CTI's senior management who will ensure that appropriate resources are
deployed rapidly to resolve any relevant problem.

PART IV - CUSTOMER SUPPORT

SERVICE PLANNING SUPPORT

CTI will provide support to BDB as follows:

 .    liaison with NTL and BBC R&D as necessary;

 .    consultation with the ITC and RA as appropriate; and

 .    advice on subscriber coverage issues. (This will include a telephone
     hotline which will operate 09:30 to 17.30 Monday to Friday, with backup
     from the TOC at other times. The TOC will call on specialist engineering
     support to deal with urgent enquiries when necessary, on an ad-hoc basis.)

CTI will deploy additional resources from its partner TDF as necessary.

DTT SURVEYS

CTI will survey DTT coverage by actual measurement of field strength at early
installations, concentrating on areas where coverage is predicted to be
marginal. The CTI prediction models will then be refined iteratively using
measured data to a level where further verification is deemed unnecessary by
both parties. Predictions will take due account of the degree of interference to
be expected as the network expands.

CTI will verify that now DTT transmit antennas as installed will comply with the
relevant Template.

                                       75
<PAGE>
 
This shall be achieved by electrical and mechanical tests and inspections of the
antenna, on works acceptance and as a part of installation commissioning. This
work will conform with current best industry practice.

CTI will make the results of these tests available to BDB. BDB reserves the
right to carry out independent tests to verify compliance with the relevant
Template.

In order to be able to verify that field strength remains stable over time, a
series of reference measurements will be made at agreed locations.

CTI will make additional support available for service coverage measurements
when requested by BDB in accordance with the rate card arrangements in Clause
9.5.

TEST TRANSMISSIONS AT EARLY STATIONS

Prior to the launch of service CTI shall provide early test transmissions to an
agreed timetable at an agreed (small) number of Stations. The purpose of these
transmissions is to provide early verification of planning tools and assumptions
and to provide a source of signals for receiver testing. The format and content
of these transmissions is to be agreed between CTI and BDB.

Routine Test Transmissions will be provided at all Stations as part of the
commissioning and acceptance process.

                                       76
<PAGE>
 
SOURCE EQUIPMENT

Prior to the availability of Distribution Network feeds at the test Stations,
CTI will provide temporary source equipment as necessary to ensure that Test
Transmissions can take place. CTI have included costs for up to [*] for the
provision of the necessary source equipment. Purchase of additional equipment
will be dealt with under the Change Control Procedure. The format of this
equipment and the storage medium used will be agreed between CTI and BDB. Any
programme material required for Test Transmissions will be provided by BDB in an
agreed format.

As the Distribution Network becomes available the Test Transmission signals will
be inserted by CTI at the BDB Interface using equipment similar to that provided
at the Stations. At an agreed time, prior to the first start of Site Service
Date, BDB shall make signals suitable for transmission available at  the BDB
Interface.

TEST BED

CTI will continue to support the development of DTT systems using testbed
facilities at Sutton Coldfield to test new equipment and systems.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      77
<PAGE>
 
                                  SCHEDULE 5

                             TRANSMISSION TESTING

PART I - ACCEPTANCE TEST SPECIFICATION

PARAMETERS & LIMITS
- -------------------

This table details the test parameters, methods of measurement and limits
applicable.

                                       78
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      79
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      80
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      81
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      82
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      83
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      84

<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
                          
                                      85
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      86

<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      87
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      88
<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      89
<PAGE>
 
PART II - TRANSMISSION FAULT THRESHOLDS

For acceptance testing CTI shall demonstrate that exceeding the thresholds in
the table below results in the appropriate executive actions (e.g. changeovers)
and that the relevant alarms are raised at the TOC.

For the purposes of this Agreement the Transmission Fault Thresholds are as
follows:

SCHEDULE 5 - TABLE 2 Transmission Fault Thresholds

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      90

<PAGE>
 
[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      91
<PAGE>
 
                                  SCHEDULE 6

                  THE BDB INTERFACE AND HANDOVER REQUIREMENTS


PART I - DISTRIBUTION

ACCOMMODATION

CTI will require secure accommodation within the Multiplex Center for the
installation of the circuit terminating equipment, and any associated monitoring
(the "CTI Area").  Provision is required for two PTO racks (separate A&B
systems) and one CTI rack.  BDB shall be responsible for maintaining the ambient
temperature within this CTI Area between +10 degrees celsius and +30 degrees
celsius, by appropriate means.  The area shall be sufficient to provide front
and rear access to the PTO racks for maintenance and be adequately illuminated
to allow repair of electronic equipment in the racks.

POWER REQUIREMENTS

Each of the racks will consume up to 500w from a 230vAC supply provided by BDB.
In order to ensure full redundancy, the power for the "A & B" racks shall be
provided from diversely derived supplies, such that a single failure in the
power distribution system will not cause both supplies to fail simultaneously.
Should BDB choose to protect the supplies to the multiplex equipment with
locally generated or UPS supplies, then this level of protection shall also be
provided to the CTI interface area.  A suitable technical earth is also
required.

In addition to the equipment supplies, a minimum of four 'general purpose' 13A
sockets shall be provided adjacent to the racks for the connection of test
equipment.

TELECOMMUNICATIONS REQUIREMENTS

The distribution circuits from the CTI Area require diverse optical fibre
routing to the PTO network with an agreed practicable separation within the
building until they approach the CTI Area, thereafter a reduced practicable
separation shall be provided.  Either a PSTN Direct Exchange Line or an
extension of the BDB multiplex centre telephone system will be required within
the CTI area.

ACCESS ARRANGEMENTS

CTI& BDB shall agree on a system such that necessary maintenance personnel can
gain access to the CTI Area for the diagnosis and correction of equipment
faults, on the production of an appropriate identification.  Access is required
on a 24hr/365 day basis, and includes PTO staff unaccompanied by CTI for the
correction of circuit faults but will be subject to an agreed operational
procedure.

                                       92
<PAGE>
 
TRANSPORT STREAM PRESENTATION

Each of the three groups of six macro region transport steam multiplexes shall
be a single presentation in an agreed ASZI format.

Due to availability and reliability considerations, CTI do not propose to re-
generate the transport stream prior to connection to the terrestrial circuit
interface.

Each transport stream provided at the interface point will be at an agreed
bitrate.

                                       93
<PAGE>
 
PART II - NETWORK STATUS SYSTEM

For a detailed description of the Network Status System please refer to Schedule
3 Part IIIa.

ACCOMMODATION

The Network Status System will require BDB to provide dedicated desk space in a
secure and environmentally controlled area for the following items:

 .    personal Computer;

 .    network router (including electronic firewall);

 .    monitor (17");

 .    keyboard and mouse; and

 .    inkjet Printer (consumables will be provided by BDB at its own cost).

POWER REQUIREMENTS

BDB shall provide six mains outlets (total maximum load greater than 13A) on the
desk that will carry the Network Status System computer and other hardware.

A maintained mains outlet shall also be provided by BDB for the Kilostream
circuit.

TELECOMMUNICATIONS REQUIREMENTS

CTI will require the following circuits to be installed in the Multiplex Centre
in the vicinity of the Network Status System location.

 .    BT Termination for 64k Kilostream circuit; and

 .    BT Termination for ISDN 2 circuit.

Connection and rental charges for these circuits shall be met by CTI.

                                       94
<PAGE>
 
                                  SCHEDULE 7

               CALCULATION OF DELAY REBATES AND SERVICE CREDITS


PART I - ILLUSTRATION OF RELATIONSHIP BETWEEN DATES

The following diagram illustrates the relationship between the types of the date
specified in the Contract.



   [Diagram which illustrates the relationship between the types of the date
specified in the Contract]


Contractual Review of Dates             See Clause 4.3.

Ready for Test Transmission date:       DTT Station ready to transmit and
                                        associated analogue transmitter work
                                        complete at all relevant Stations.

Ready for Service date:                 As defined in the Agreement

Start of Service date:                  As defined in the Agreement


PART II - CALCULATION OF DELAY REBATE

Table 2 lists the Daily Charges which apply under the circumstances specified in
Clause 6.

In order to calculate the Delay Rebate, the numbers of days from the relevant
Ready for Service Date to the Actual Site Service Date Inclusive ("Days of
Delay") shall be calculated in accordance with Clause 6 and entered into Table
3.  The Delay Rebate for each Station shall be entered on the table by
multiplying the Days of Delay and the Daily Charge.

                                       95
<PAGE>
 
In the case of one BDB Multiplex being delayed, the Delay Rebate shall be the
same as if all BDB Multiplexes have been delayed at that site.

Table 3 shall be completed each Year for all Station which reach their Actual
Site Service Date in that Year.  The Total Delay Rebate for that year (the sum
of the column, shown on the last line of Table 3), shall be subtracted from
CTI's first monthly invoice in the following year.

PART III - CALCULATION OF SERVICE CREDITS

Service Credits become payable if Accountable Availability falls below [*],
except in the case of Bressay, Eitshal, Keelylang, Hill and Torosay where
Service Credits become payable if Accountable Availability falls below [*].

DERIVATION OF ACCOUNTABLE AVAILABILITY

               Accountable Availability = A-B x 100%
                                          ---       
                                           A

Where:

A = Total number of minutes in the previous six months

B = Total number of minutes in the previous six months during which performance
is worse than the Service Shutdown Threshold as defined in Schedule 5 Part II,
arising other than as a result of Non-Accountable Conditions.  This is defined
as Minutes Lost.

For each of the first five months after Start of Service, Accountable
Availability shall be calculated over the previous six months by treating
performance prior to Start of Service as always exceeding the Service Shutdown
Threshold i.e. the contribution to variable B in the above equation for those
months shall equal zero.

The following are Non-Accountable Conditions:

a)   a Force Majeure Event;

b)   extreme weather conditions affecting traveling to any remotely located
     Station;

c)   a delay of no more than [*] in re-establishing the Services when
     switching to standby equipment;

d)   a delay of no more than [*] in re-establishing the Services when
     switching to alternative power supplies;

e)   interruption for essential or planned works on mast structures, GRP
     cylinders and stays made in compliance with Clauses 15.1 or 15.2. The
     timing and length of each interruption shall be agreed by the parties as
     set out in Schedule 4 Part III;

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      96

<PAGE>
 
f)   frequency planning or international frequency clearance issues;

g)   incidents arising as a result of known and previously agreed fundamental
     equipment design deficiencies which cannot be immediately rectified, from
     the date at which the deficiency is identified and agreed by the parties,
     to the date agreed for rectification;

h)   compliance with the mandatory requirements of any law, any national or
     supranational regulatory authority, the Radio Regulations or any statutory
     obligations;

i)   planned and previously agreed interruptions to undertake modifications to
     the DTT Transmission Network required by BDB and/or legal or regulatory
     bodies such as the Radio-communications Agency and the Independent
     Television Commission, unless the interruption is required to remedy a
     situation arising due to the fault or omission of CTI, its agents or sub-
     contractors;

j)   where invasive tests are required by BDB, such as the measurements of group
     delay, provided that the results meet the Technical Specifications.

k)   any failure or degradation of the signal or message comprising the BDB
     Signals from the BDB Interface to the CTI interface;

l)   any material breach of this Agreement by BDB (or any act or omission of it
     or its agents or sub-contractors) to the extent that it prevents or impedes
     the performance of CTI's obligations to provide the Distribution Service
     and DTT Transmission Service; and

m)   where any of the relevant part of the Network is requisitioned, taken over
     or used pursuant to the exercise of any Emergency Powers.

Account Availability shall be calculated at the end of each month, for each BDB
Multiplex at each of the sites listed in Table 3.  The result shall be sent to
BDB by the 7th day of the following month.

NON-COMPLAINT SERVICE

Each BDB Multiplex at each site which has an Accountable Availability result of
less than [*], shall be deemed a Non-Complaint Service ([*])

At the end of each month, a Service Credit amount shall be calculated for each
Non-Complaint Service.

The value of the Service Credit shall be related to the severity of the service
loss, by taking account of the time of day when the performance was worse than
the Service Shutdown Threshold, and the population served by the Non-Complaint
Service.  This shall be achieved through the use of adjustment and weighting
factors in Tables 1, 2 and 3.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      97
<PAGE>
 
CALCULATION OF SERVICE CREDITS

Each month, the total Minutes Lost by a Non-Complaint Service during the
previous six months shall be entered into the second column of Table 1, with
separate figures for losses during each hour of the day. Each figure shall then
be multiplied by the corresponding Time Adjustment Factor to give Unweighted
Service Credits, which are totalled to give the Unweighted Service Credit Total,
The Service Credit shall be calculated by inserting the relevant Station
Weighting Factor from Table 3 and multiplying it by the Unweighted Service
Credit Total.

                                       98
<PAGE>
 
Format of Table 1

The figures in italics are for illustration and they are included in order to
demonstrate that 60 minutes complete loss of service from one multiplex at
Crystal Palace during peak time will result in a Service Credit payment of [*].
This total will accrue because the 60 minute loss of service will be included on
the table below for six consecutive months, giving six payments of
[*].

The table shows a 60 minutes loss of service between 21:00 and 22:00.  The time
lost, in minutes, is entered in the second column and multiplied by the Time
Adjustment Factor in the third column (100 in this case) to achieve a monetary
Unweighted Service Credit as shown.  The Unweighted Service Credits are totalled
down the column (S) and multiplied by the Station Weighting Factor to obtain a
Service credit of [*].


     STATION 7 - TABLE 1                EXAMPLE OF SERVICE CREDIT CALCULATION


                                        [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      99
<PAGE>
 
SERVICE CREDITS FOR SIMULTANEOUS FAILURE AT MORE THAN ONE STATION

If a single distribution failure results in more than one Station having a Non-
Complaint Service, then Service Credits with respects to this simultaneous
failure at more than one Station shall be calculated as follows, instead of
using Station Weighting Factors from Table 3:-

   Unweighted Service Credits shall be calculated using Table 1 and then the
   Unweighted Service Credit Total shall be multiplied by the relevant Service
   Weighting Factor given in Table 2, to derive the Service Credit.

               SCHEDULE 7 - TABLE 2 - Service Weighting Factors

                                      [*]

   For the purposes of this Table only the population served shall be the gross
   population figures for the relevant multiplexes at the relevant Stations, as
   defined by the ITC from time to time.

TIMING OF SERVICE CREDIT PAYMENTS

A Service Credit payment shall be made one per Year only and it shall be in the
form of a reduction in CTI's first monthly invoice for the Year.  The amount of
the reduction shall equal the total of Service Credits calculated during the
previous Year.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      100
<PAGE>
 
REDUCTION DURING THE INITIAL PERIOD

During the first three months after Start of Service, each Minute Lost will be
reduced by 50% before entering the resultant figures into Table 1.  This
reduction is subject to one month "burn in" period being available prior to
Start of Service date.  Should this period not be available then the reduction
is decreased in proportion e.g. two weeks "burn in" equates to six weeks
reduction.

                                      101
<PAGE>
 
        SCHEDULE 7 - TABLE 3 STATION WEIGHING FACTORS AND DAILY CHARGES

The table shows two values for each Station, the Daily Charge P. used in Daily
Rebate calculations, and the Station Weighting Factor used in Service Credit
calculations.

                    SCHEDULE 7 - TABLE 3       SHEET 1 OF 3

<TABLE>
<CAPTION>
      STATION         DAYS OF      DAILY     DELAY REBATE     STATION WEIGHTING FACTOR (TO
                       DELAY     CHARGE P      = D X P         BE INSERTED IN TABLE 1, FOR          
                         D       (Pounds)      (Pounds)        SERVICE CREDIT CALCULATION)  
- ---------------------------------------------------------------------------------------------
<S>                   <C>        <C>         <C>              <C>
  Aberdare                         [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Angus                            [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Beacon Hill                      [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Belmont                          [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Bilsdale                         [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Black Hill                       [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Blaenplwyf                       [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Bluebell Hill                    [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Bressay                          [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Brierley Hill                    [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Bristol Ilchester                [*]                                    [*]
   Crescent
- ---------------------------------------------------------------------------------------------
  Bristol Kings                    [*]                                    [*]
   Weston
- ---------------------------------------------------------------------------------------------
  Bromsgrove                       [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Brougher Mountain                [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Caldbeck                         [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Caradon Hill                     [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Carmel                           [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Chatton                          [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Chesterfield                     [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Craigkelly                       [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Crystal Palace                   [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Darvel                           [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Divis                            [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Dover                            [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Durris                           [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Eitshal                          [*]                                    [*]
- ---------------------------------------------------------------------------------------------
  Emley Moor                       [*]                                    [*]
- ---------------------------------------------------------------------------------------------
</TABLE>

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      102
<PAGE>
 
                    SCHEDULE 7 - TABLE 3       SHEET 2 OF 3

<TABLE>
<CAPTION>
     STATION         DAYS OF     DAILY    DELAY REBATE    STATION WEIGHTING FACTOR (TO
                      DELAY     CHARGE P    = D X P       BE INSERTED IN TABLE 1, FOR               
                        D                                 SERVICE CREDIT CALCULATION)  
- -----------------------------------------------------------------------------------------
<S>                  <C>        <C>       <C>             <C>
   Fenham                         [*]                                [*]
- -----------------------------------------------------------------------------------------
   Fenton                         [*]                                [*]
- -----------------------------------------------------------------------------------------
   Fremont Point                  [*]                                [*]
- -----------------------------------------------------------------------------------------
   Guildford                      [*]                                [*]
- -----------------------------------------------------------------------------------------
   Hannington                     [*]                                [*]
- -----------------------------------------------------------------------------------------
   Hastings                       [*]                                [*]
- -----------------------------------------------------------------------------------------
   Heathfield                     [*]                                [*]
- -----------------------------------------------------------------------------------------
   Hernel Hempstead               [*]                                [*]
- -----------------------------------------------------------------------------------------
   Huntshaw Cross                 [*]                                [*]
    Main
- -----------------------------------------------------------------------------------------
   Huntshaw Cross                 [*]                                [*]
    Fill In
- -----------------------------------------------------------------------------------------
   Idle                           [*]                                [*]
- -----------------------------------------------------------------------------------------
   Keelylang Hill                 [*]                                [*]
- -----------------------------------------------------------------------------------------
   Keighley                       [*]                                [*]
- -----------------------------------------------------------------------------------------
   Kilvey Hill                    [*]                                [*]
- -----------------------------------------------------------------------------------------
   Knock More                     [*]                                [*]
- -----------------------------------------------------------------------------------------
   Lancaster                      [*]                                [*]
- -----------------------------------------------------------------------------------------
   Larkstoke                      [*]                                [*]
- -----------------------------------------------------------------------------------------
   Limavady                       [*]                                [*]
- -----------------------------------------------------------------------------------------
   Llanddona                      [*]                                [*]
- -----------------------------------------------------------------------------------------
   Malvern                        [*]                                [*]
- -----------------------------------------------------------------------------------------
   Mendip                         [*]                                [*]
- -----------------------------------------------------------------------------------------
   Midhurst                       [*]                                [*]
- -----------------------------------------------------------------------------------------
   Moel-y-Parc                    [*]                                [*]
- -----------------------------------------------------------------------------------------
   Nottingham                     [*]                                [*]
- -----------------------------------------------------------------------------------------
   Olivers Mount                  [*]                                [*]
- -----------------------------------------------------------------------------------------
   Oxford                         [*]                                [*]
- -----------------------------------------------------------------------------------------
   Pendle Forest                  [*]                                [*]
- -----------------------------------------------------------------------------------------
   Plympton                       [*]                                [*]
- -----------------------------------------------------------------------------------------
   Pontop Pike                    [*]                                [*]
- -----------------------------------------------------------------------------------------
</TABLE>

[*] indicates where text has been omitted pursuant to a request for    
    confidential treatment. The omitted text has been filed with the    
    Securities and Exchange Commission separately. 

                                      103

<PAGE>
 
                      SCHEDULE 7 - TABLE 3   SHEET 3 OF 3

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------
     STATION        DAYS OF    DAILY      DELAY REBATE      STATION WEIGHTING FACTOR (TO 
                     DELAY    CHARGE P       = D X P         BE INSERTED IN TABLE 1, FOR             
                       D                                     SERVICE CREDIT CALCULATION)
- -----------------------------------------------------------------------------------------
<S>                 <C>       <C>         <C>               <C>
 Pontypool                      [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Presely                        [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Redruth                        [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Reigate                        [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Ridge Hill                     [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Rosemarkle                     [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Rosneath                       [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Rowridge                       [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Rumster Forest                 [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Saddleworth                    [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Salisbury                      [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Sandy Heath                    [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Selkirk                        [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Sheffield                      [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Stockland Hill                 [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Storeton                       [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Sudbury                        [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Sutton Coldfield               [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Tacolneston                    [*]                                     [*]
- -----------------------------------------------------------------------------------------
 The Wrekin                     [*]                                     [*]
- -----------------------------------------------------------------------------------------
 The Wrekin West                [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Torosay                        [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Tunbridge Wells                [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Waltham                        [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Wenvoe                         [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Whitehawk Hill                 [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Winter Hill Fill-In            [*]                                     [*]
- -----------------------------------------------------------------------------------------
 Winter Hill Main               [*]                                     [*]
- -----------------------------------------------------------------------------------------
</TABLE>

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.
   
                                   104
<PAGE>
 
                                  SCHEDULE 8

                                   STATIONS

The Stations are listed in the order of the reference numbers provided by BDB.

Dates are underlined if they are not in consecutive order on the table.



              SCHEDULE 8 - TABLE 1      SHEET 1 OF 3      PHASE I

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------
                                     SITE               MULTIPLEX      MULTIPLEX ERP       TARGET SITE
                                                         CHANNEL                          SERVICE DATE
- ----------------------------------------------------------------------------------------------------------------
NO.       STATION NAME        ABB.  OWNER  RESPONSE   B    C    D      B    C    D
                                           TIME (1)
- ----------------------------------------------------------------------------------------------------------------
<S>    <C>                    <C>   <C>    <C>        <C>  <C>  <C>   <C>   <C>  <C>      <C> 
  1    Pontop Pike             PP    CTI     [*]      62   65   53     10     10     2            [*]
- ----------------------------------------------------------------------------------------------------------------
  2    Belmont                BMN    NTL     [*]      66   60   57     10      4     4            [*]
- ----------------------------------------------------------------------------------------------------------------
  3    Wenvoe                  WV    CTI     [*]      67  N/A  N/A     10      0     0            [*]
- ----------------------------------------------------------------------------------------------------------------
  4    Black Hill             BKH    NTL     [*]      51   55   65     10     10    10            [*]
- ----------------------------------------------------------------------------------------------------------------
  5    Caldbeck               CDK    NTL     [*]      39   45   42    1.6    1.6   1.6            [*]
- ----------------------------------------------------------------------------------------------------------------
  6    Caradon Hill           CNH    NTL     [*]      21   24   27      2      2     2            [*]
- ----------------------------------------------------------------------------------------------------------------
  7    Emley Moor             MLM    NTL     [*]      46   50   49      5      5     2            [*]
- ----------------------------------------------------------------------------------------------------------------
  8    Durris                 DUS    NTL     [*]      51   41   44      5      5     5            [*]
- ----------------------------------------------------------------------------------------------------------------
  9    Craigkelly             CGK    NTL     [*]      26   42   39      1      2     2            [*]
- ----------------------------------------------------------------------------------------------------------------
 10    Sandy Heath            SDT    NTL     [*]      67   40   46     10    2.5   2.5            [*]
- ----------------------------------------------------------------------------------------------------------------
 11    Winter Hill Main       WRH    NTL     [*]      50   60   63      2      2     2            [*]
- ----------------------------------------------------------------------------------------------------------------
 11    Winter Hill Fill-In    WRH    NTL     [*]       0   43   40      0    0.2   0.2            [*]
- ----------------------------------------------------------------------------------------------------------------
 12    Stockland Hill         SDL    NTL     [*]      32   30   34    2.5    2.5   2.5            [*]
- ----------------------------------------------------------------------------------------------------------------
 13    Sutton Coldfield        SC    CTI     [*]      51   52   55      4      2     2            [*]
- ----------------------------------------------------------------------------------------------------------------
 14    Crystal Palace          CP    CTI     [*]      28   34   29    6.5      1     1            [*]
- ----------------------------------------------------------------------------------------------------------------
 15    Bilsdale               BIL    CTI     [*]      24   27   42      3      3   0.4            [*]
- ----------------------------------------------------------------------------------------------------------------
 16    Mendip                 MEN    CTI     [*]      65   62   48      3   0.25  0.25            [*]
- ----------------------------------------------------------------------------------------------------------------
 17    Waltham                WBF    CTI     [*]      33   45   42     10      5     5            [*]
- ----------------------------------------------------------------------------------------------------------------
 18    Hannington             HAN    CTI     [*]      46   29   48      5    1.3  0.85            [*]
- ----------------------------------------------------------------------------------------------------------------
 19    Divis                  DIV    CTI     [*]      26   48   34    2.3      1   0.8            [*]
- ----------------------------------------------------------------------------------------------------------------
 20    Rowridge               ROW    CTI     [*]      32   25   28      3      3     3            [*]
- ----------------------------------------------------------------------------------------------------------------
 21    Oxford                  OF    CTI     [*]      52   48   67      3      1     1            [*]
- ----------------------------------------------------------------------------------------------------------------
 22    Moel-y-Parc            MYP    NTL     [*]      64   30   34    0.5   0.25  0.25            [*]
- ----------------------------------------------------------------------------------------------------------------
 23    Tacolneston            TAC    CTI     [*]      57   43   46     10     10     5            [*]
- ----------------------------------------------------------------------------------------------------------------
 24    Fremont Point          FRP    NTL     [*]      32   66   68    0.2    0.2   0.2            [*]
- ----------------------------------------------------------------------------------------------------------------
</TABLE>

[*]   indicates where text has been omitted pursuant to a request for
      confidential treatment. The omitted text has been filed with the
      Securities and Exchange Commission separately.

                                      105
<PAGE>
 
          SCHEDULE 8 - TABLE 1        SHEET OF 2 OF 3         PHASE 2


<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------       
                                   SITE                    MULTIPLEX       MULTIPLEX ERP       TARGET SITE
                                                             CHANNEL                          SERVICE DATE
- -----------------------------------------------------------------------------------------------------------------
NO.     STATION NAME     ABB.      OWNER      RESPONSE     B   C   D        B     C     D
                                               TIME (1)
- -----------------------------------------------------------------------------------------------------------------
<S>     <C>              <C>       <C>        <C>          <C> <C> <C>     <C>   <C>   <C>       <C>  
 25     Bluebell Hill    BBL       CTI        [*]          45  42  39       3     3     3          [*]
- -----------------------------------------------------------------------------------------------------------------
 26     Sudbury          SUY       CTI        [*]          39  54  50       7.5   1.5   1.1        [*]
- -----------------------------------------------------------------------------------------------------------------
 27     Darvel           DVL       NTL        [*]          28  30  34       2     2     2          [*]
- -----------------------------------------------------------------------------------------------------------------
 28     Angus            AGU       NTL        [*]          62  56  65       2     2      2         [*]
- -----------------------------------------------------------------------------------------------------------------
 29     Midhurst         MH        CTI        [*]          59  64  60       2.5   1     1          [*]
- -----------------------------------------------------------------------------------------------------------------
 30     Selkirk          SXI       NTL        [*]          63  66  56       3     0.5   0.5        [*]
- -----------------------------------------------------------------------------------------------------------------
 31     The Wrekin West  WRK       CTI        [*]          27  53  63       1     1     1          [*]
- -----------------------------------------------------------------------------------------------------------------
 31     The Wrekin West  WRK       CTI        [*]          41   0   0       1     0     0          [*]
- -----------------------------------------------------------------------------------------------------------------
 32     Kilvey Hill      KVH       CTI        [*]          32  21  31       0.3   0.05  0.05       [*]
- -----------------------------------------------------------------------------------------------------------------
 33     Ridge Hill       RHA       NTL        [*]          39  42  45       1     1     1          [*]
- -----------------------------------------------------------------------------------------------------------------
 34     Saddleworth      SWH       NTL        [*]          51  39  54       0.02  0.02  0.02       [*]
- -----------------------------------------------------------------------------------------------------------------
 35     Heathfield       HJV       CTI        [*]          47  54  51       1     1     1          [*]
- -----------------------------------------------------------------------------------------------------------------
 36     Blaenplwyf       BY        CTI        [*]          32  29  33       2     1     1          [*]
- -----------------------------------------------------------------------------------------------------------------
 37     Beacon Hill      BNL       NTL        [*]          54  56  64       1     1     1          [*]
- -----------------------------------------------------------------------------------------------------------------
 38     Carmel           CRL       CTI        [*]          62  68  64       2.5   10    1          [*]
- -----------------------------------------------------------------------------------------------------------------
 39     Sheffield        SF        CTI        [*]          60  45  42       0.05  0.05  0.05       [*]
- -----------------------------------------------------------------------------------------------------------------
 40     Limavady         LTS       CTI        [*]          57  60  63       0.8   0.8   0.8        [*]
- -----------------------------------------------------------------------------------------------------------------
 41     Nottingham       NOU       NTL        [*]          63  29  59       0.02  0.02  0.02       [*]
- -----------------------------------------------------------------------------------------------------------------
 42     Dover            DOV       NTL        [*]          58  57  60       1     1     0.5        [*]
- -----------------------------------------------------------------------------------------------------------------
 43     Whitehawk Hill   WL        CTI        [*]          48  58  61       1     0.4   0.4        [*]
- -----------------------------------------------------------------------------------------------------------------
 44     Fenham           FNH       CTI        [*]          28  32  57       0.02  0.02  0.02       [*]
- -----------------------------------------------------------------------------------------------------------------
 45     Llanddona        LLA       CTI        [*]          61  64  46       1     1     0.5        [*]
- -----------------------------------------------------------------------------------------------------------------
 46     Guildford        GI        CTI        [*]          51  47  54       0.1   0.1   0.1        [*]
- -----------------------------------------------------------------------------------------------------------------
 47     Presely          PRS       NTL        [*]          42  45  49       1     1     1          [*]
- -----------------------------------------------------------------------------------------------------------------
 48     Rosemarkie       RK        CTI        [*]          44  46  50       10    4     4          [*]
- -----------------------------------------------------------------------------------------------------------------
 49     Hemel Hempstead  HH        CTI        [*]          66  50  43       0.1   0.1   0.1        [*]
- -----------------------------------------------------------------------------------------------------------------
 50     Lancaster        LCR       NTL        [*]          32  34  30       0.1   0.1   0.1        [*]
- -----------------------------------------------------------------------------------------------------------------
 51     Bristol IC       BSL       CTI        [*]          44  47  51       0.02  0.02  0.02       [*]
- -----------------------------------------------------------------------------------------------------------------
 52     Idle             IDL       NTL        [*]          56  30  42       0.003 0.003 0.003      [*] 
- -----------------------------------------------------------------------------------------------------------------
</TABLE>

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      106
<PAGE>
 
            SCHEDULE 8 - TABLE 1      SHEET OF 3 OF 3      PHASE 3

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------
                               SITE                       MULTIPLEX       MULTIPLEX ERP          TARGET SITE
                                                           CHANNEL                              SERVICE DATE
- -----------------------------------------------------------------------------------------------------------------
NO.     STATION NAME         ABB.     OWNER  RESPONSE     B    C    D     B      C    D
                                             TIME (1)
- -----------------------------------------------------------------------------------------------------------------
<C>     <S>                  <C>      <C>    <C>         <C> <C>  <C>     <C>    <C>     <C>    <C>  
 53     Brougher Mountain    BRM      CTI     [*]        26   29   33     0.5     0.5    0.5     [*]
- -----------------------------------------------------------------------------------------------------------------
 54     Redruth              RR       CTI     [*]        49   43   50     1.6     1      1       [*]
- -----------------------------------------------------------------------------------------------------------------
 55     Hastings             HS       CTI     [*]        24   63   60     0.2     0.2    0.2     [*]
- -----------------------------------------------------------------------------------------------------------------
 56     Chesterfield         CD       NTL     [*]        46   50   52     0.02    0.02   0.02    [*]
- -----------------------------------------------------------------------------------------------------------------
 57     Bromsgrove           BGE      CTI     [*]        23   26   30     0.0125  0.0125 0.025   [*]
- -----------------------------------------------------------------------------------------------------------------
 58    Pendle Forest         PLF      NTL     [*]        31   30   34     0.05    0.05   0.05    [*]
- -----------------------------------------------------------------------------------------------------------------
 59    Chatton               CHN      NTL     [*]        46   47   51     1       1      1       [*]
- -----------------------------------------------------------------------------------------------------------------
 60    Reigate               REI      CTI     [*]        27  N/A  N/A     0.1     0      0       [*]
- -----------------------------------------------------------------------------------------------------------------
 61    Malvern               MVR      CTI     [*]        55   23   26     0.1     0.05   0.05    [*]
- -----------------------------------------------------------------------------------------------------------------
 62    Rosneath              ROS      NTL     [*]        60   63   48     0.1     0.1    0.1     [*]
- -----------------------------------------------------------------------------------------------------------------
 63    Bristol KW            BSK      CTI     [*]        32   30   34     0.01    0.05   0.05    [*]
- -----------------------------------------------------------------------------------------------------------------
 64    Fenton                FNT      CTI     [*]        25   28   32     0.05    0.05   0.05    [*]
- -----------------------------------------------------------------------------------------------------------------
 65    Storeton              SEN      CTI     [*]        26   29   33     0.028   0.028  0.028   [*]
- -----------------------------------------------------------------------------------------------------------------
 66    Tunbridge Wells       TW       CTI     [*]        45   39   59     0.1     0.1    0.1     [*]
- -----------------------------------------------------------------------------------------------------------------
 67    Plympton              PTN      NTL     [*]        60   63   56     0.1     0.1    0.1     [*]
- -----------------------------------------------------------------------------------------------------------------
 68    Salisbury             SA       CTI     [*]        62   65   52     0.5     0.5    0.16    [*]
- -----------------------------------------------------------------------------------------------------------------
 69    Larkstoke             LKK      CTI     [*]        27   57   60     0.025   0.025  0.025   [*]
- -----------------------------------------------------------------------------------------------------------------
 70    Keighley              KJ       NTL     [*]        34  N/A  N/A     0.05    0      0       [*]
- -----------------------------------------------------------------------------------------------------------------
 71    Huntshaw Cross        HC       NTL     [*]        64   53   57     2       2      2       [*]
- -----------------------------------------------------------------------------------------------------------------
       Huntshaw Cross        HC       NTL     [*]        64   53   57     2       2      2       [*]
- -----------------------------------------------------------------------------------------------------------------
 72    Knock More            KMR      NTL     [*]        57   60   56     1       1      1       [*]
- -----------------------------------------------------------------------------------------------------------------
 73    Rumster Forest        RMF      NTL     [*]        32   62   59     1       2      2       [*]
- -----------------------------------------------------------------------------------------------------------------
 74    Aberdare              ABR      CTI     [*]        26   29   33     0.025   0.025  0.05    [*]
- -----------------------------------------------------------------------------------------------------------------
 75    Eitshal               ETL      CTI     [*]        25   28   32     0.8     0.8    0.8     [*]
- -----------------------------------------------------------------------------------------------------------------
 76    Brierley Hill         BOF      CTI     [*]        59   66   62     0.1     0.05   0.05    [*]
- -----------------------------------------------------------------------------------------------------------------
 77    Olivers Mount         OMT      CTI     [*]        58   61   64     0.05    0.05   0.05    [*]
- -----------------------------------------------------------------------------------------------------------------
 78    Keelylang Hill        KEE      CTI     [*]        44   47   51     0.63    0.63   0.63    [*]
- -----------------------------------------------------------------------------------------------------------------
 79    Pontypool             PPL      CTI     [*]        45   66   68     0.01    0.01   0.01    [*]
- -----------------------------------------------------------------------------------------------------------------
 80    Torosay               TOY      CTI     [*]        33   21   31     0.125   0.125  0.125   [*]
- -----------------------------------------------------------------------------------------------------------------
 81    Bressay               BRQ      CTI     [*]        31   66   68     1       0.1    0.1     [*]
- -----------------------------------------------------------------------------------------------------------------
</TABLE>

[*]   indicates where text has been omitted pursuant to a request for
      confidential treatment. The omitted text has been filed with the
      Securities and Exchange Commission separately.

                                      107
<PAGE>
 
NOTES ON SCHEDULE 8, TABLE 1

Note 1: Response time   Time from which transmitting station automatic
                        monitoring equipment signals a fault to the TOC, until
                        arrival on site

Note 2:                 Whitehawk Hill has suffered from gypsies and vandals so
                        is no longer visited at night for security

Note 3:                 Rumster Forest will be 1h provided the team are not on
                        Orkney

Note 4:                 No night-time ferry from Bressay

Note 5:                 For the purposes of Clause 8.1 Crystal Palace and Divis
                        have been allocated high priority status by CTI

                                      108
<PAGE>
 
                                  SCHEDULE 9

                              THE IMPACT SCHEDULE
                       (BDB DTT ANALOGUE CONSEQUENTIALS)

PART I - INTRODUCTION

This document defines the work which CTI will undertake, either directly or
through NTL, in connection with the modifications to existing analogue TV plant
as a result of the introduction of the DTT service in the UK.

The work described here is strictly limited to the consequentials of the
introduction of the BDB Multiplexes.

The work described forms the 'baseline' for CTI's responsibilities under the BDB
DTT Contract. It reflects the changes which are known at 15 August 1997. Any
further changes will be dealt with under the 'Change Control' procedures as laid
down in Schedule 1 of the DTT Contract.

PART II - SCOPE OF WORK

The work described in this Schedule and included in the Contract price is
outlined in the following ITC documents:

 .    "Impact of Digital TV Relay Stations on UK Analogue Services", Doc. No. 18,
     Ver 1.0, 30 April 1997;

 .    "Impact of Digital TV Main Stations on UK Analogue Services, Results of
     field work for Stage 1 and 2 sites", Doc. No. 19, Ver 1.0, 31 May 1997; and

 .    "Change to DTT Frequency Plan", Doc. No. 21, Ver 1.0, 6 August 1997.

PART III - SPECIFIC EXCLUSIONS IN THIS SCHEDULE

Please refer to the list of specific exclusions in Schedule 9, Table I and Table
2.

In particular, the following are not included:-

 .    domestic re-tuning; and

 .    any subsequent changes required by the ITC.

PART IV - SCHEDULE OF WORK

DESCRIPTION OF WORK AT SITES OTHER THAN DTT STATIONS

Schedule 9, Table 1 shows the type of work required at each of the analogue
relay stations in connection with the introduction of the BDB Multiplexes. The
work under the various headings is described below:

                                      109
<PAGE>
 
PRECISION OFFSET

In most cases precision offset is impossible to implement with the existing
equipment due to its design. At such sites the transmission plant will have to
be replaced.

CHANNEL CHANGE

Existing equipment can generally be retuned. However the ITC stipulates that
there is to be no degradation of service for existing viewers. This means that
the old and new channels should be simulcast for a period to be specified by the
broadcasters which will require the purchase of temporary systems.

In addition the broadcasters require the use of captioning on the existing
channels in such circumstances.

INCREASE IN ERP

This can be achieved either by the modification of the transmit antenna or by
increasing the transmitter output power. In most cases this is combined with
precision offset working so new equipment Is called for. In cases where space is
limited and the transmission plant is integrated into one bay, an increase in
ERP of one service will mean that new equipment will be required for all the
services on a site.

NEW ANALOGUE RELAY

In five cases new relays will be provided. At [*] this will be by addition of
equipment at an existing NTL site where space exists in the current building
([*] will be fed by RBL from Wrexham-Rhos).

At Prestatyn a new Relay will have to be built on a green-field site.

RBL ANTENNA MODIFICATIONS

In a few cases modification of the existing site RBL receive antennas is
required to reduce Interference to the received signal.

NEW TRANSMIT ANTENNA

In some cases, a new transmit antenna is required for one or both of the
following reasons:-

 .    to increase the ERP of the station with an antenna of greater gain; and/or

 .    to suit the new channel allocation(s).

                                      110
<PAGE>
 
DESCRIPTION OF WORK AT CO-SITED STATIONS

Schedule 9, Table 2 shows the work required to modify the existing analogue
transmission system, at stations, with co-sited DTT services, as a result of the
introduction of the BDB Multiplexes. The work under the various headings is
described below:-


     MODIFICATION OF VESTIGIAL SIDEBAND REGION

     To avoid degradation of a DTT multiplex which is lower adjacent to an
     existing analogue service, the VSB region of the analogue service must be
     modified. This will be carried out both at low power in the analogue drive
     equipment and also with high power filtering at the output of the
     amplifiers. This work is subject to approval by the relevant regulatory
     authority.

     MODIFICATION OF GROUP DELAY

     As a consequence of the high power filtering required to restrict the VSB
     region extra group delay correction will be required on all analogue
     services with lower adjacent DTT multiplexes. This correction will be
     installed within the analogue drive equipment. At sites where the DTT
     services are to be combined with the analogue services and transmitted from
     a common antenna this extra correction must be configured such that it can
     be easily removed from circuit when maintenance is carried out on the
     analogue equipment. Extra group delay correction will also be required at
     sites where the DTT multiplex is upper adjacent to the analogue service,
     this is easier to accomplish than at lower adjacent sites.

     PRECISION OFFSET

     Precision offset oscillators will be installed in the analogue equipment at
     five co-sited stations. This is necessary to avoid co-channel interference
     with analogue relay stations which must be frequency changed as a
     requirement of the ITC frequency plan.

     REPLACEMENT DRIVES

     A total of four analogue services will require replacement drive equipment.
     The type of drive equipment presently employed at these sites cannot be
     modified to allow lower adjacent DTT operation. New drive equipment will be
     procured and interfaced to the existing control circuits and high power
     amplifiers.

                                      111
<PAGE>
 
                              SCHEDULE 9 -TABLE 1

   SCHEDULE OF WORK: ANALOGUE MODIFICATIONS AT SITES OTHER THAN DTT STATIONS

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------
Site                 Interfering     B     C    D    Precision   Channel   Increase    New     Modify   New Tx      SHF
                      DTT Site &                     Offset      change    Power       Relay   RBL      antenna     Link
                         Mux
- ---------------------------------------------------------------------------------------------------------------------------
<S>                  <C>             <C>   <C>  <C>  <C>         <C>       <C>         <C>     <C>      <C>         <C>
Hunmanby             Belmont                x    x                                              x
- ---------------------------------------------------------------------------------------------------------------------------
Ardnadam             Black Hill       x                                     x
- ---------------------------------------------------------------------------------------------------------------------------
Bellshill SH         Black Hill                  x                x
- ---------------------------------------------------------------------------------------------------------------------------
Bronnant SH          Blaenplwvf       x                                     x 
- ---------------------------------------------------------------------------------------------------------------------------
Bath                 Briston KW       x                               
- ---------------------------------------------------------------------------------------------------------------------------
Ferryside            Caradon Hill     x                           x         x
- ---------------------------------------------------------------------------------------------------------------------------
Chagford             Carmel           x                                                         x
- ---------------------------------------------------------------------------------------------------------------------------
Staithes             Chatton                x    x                                      x   
- ---------------------------------------------------------------------------------------------------------------------------
High Keil            Divis            x                                                                              x
- ---------------------------------------------------------------------------------------------------------------------------
Bretch Hill          Emley Moor       x     x                                                   x
- ---------------------------------------------------------------------------------------------------------------------------
Buxton               Emley Moor       x     x   
- ---------------------------------------------------------------------------------------------------------------------------
Holmfirth            Emley Moor                  x                x                                      x
- ---------------------------------------------------------------------------------------------------------------------------
Nottingham           Emley Moor       x     x         x           
- ---------------------------------------------------------------------------------------------------------------------------
Sheffield            Emley Moor       x     x         x
- ---------------------------------------------------------------------------------------------------------------------------
Stoke North          Fenton           x     x    x                                      x     
- ---------------------------------------------------------------------------------------------------------------------------
Croeserw             Huntshaw         x               x                                         
- ---------------------------------------------------------------------------------------------------------------------------
Glyncorrwg           Huntshaw         x                                                         x
- ---------------------------------------------------------------------------------------------------------------------------
Ilfracombe           Huntshaw         x               x
- ---------------------------------------------------------------------------------------------------------------------------
Craigellachie        Knock More       x     x                     x   
- ---------------------------------------------------------------------------------------------------------------------------
Barrow Town          Lancaster        x                                                         x    
- ---------------------------------------------------------------------------------------------------------------------------
Kings Weston         Mendip/Ridg            x    x    x
- ---------------------------------------------------------------------------------------------------------------------------
Bidston              Moel-y-Parc            x                     x
- ---------------------------------------------------------------------------------------------------------------------------
West Kirby           Moel-y-Parc                      x           x
- ---------------------------------------------------------------------------------------------------------------------------
Stroud               Ridge Hill             x    x    x                                                  x
- ---------------------------------------------------------------------------------------------------------------------------
Cathcart             Rosneath         x     x                               x
- ---------------------------------------------------------------------------------------------------------------------------
Kelvindale           Rosneath                    x                          x
- ---------------------------------------------------------------------------------------------------------------------------
Pitlochry            Selkirk          x                                                         x
- ---------------------------------------------------------------------------------------------------------------------------
Blackburn            Sheffield        x                                     x
- ---------------------------------------------------------------------------------------------------------------------------
Hasland              Sheffield        x                                     x
- ---------------------------------------------------------------------------------------------------------------------------
Cwmbran              Stockland        x                                                 x
- ---------------------------------------------------------------------------------------------------------------------------
Wivenhoe Park        Sudbury                 x                    x
- ---------------------------------------------------------------------------------------------------------------------------
Long Mountain        Sutton           x               x
- ---------------------------------------------------------------------------------------------------------------------------
Glossop              Sutton                  x        x
- ---------------------------------------------------------------------------------------------------------------------------
Leek                 Sutton                  x        x
- ---------------------------------------------------------------------------------------------------------------------------
Lees                 Sutton                  x        x
- ---------------------------------------------------------------------------------------------------------------------------
Storeton             Sutton                  x        x
- ---------------------------------------------------------------------------------------------------------------------------
Wardle               Sutton                  x        x
- ---------------------------------------------------------------------------------------------------------------------------
Wrexham Rhos         Sutton                  x        x
- ---------------------------------------------------------------------------------------------------------------------------
Cefn-Mawr            SuttonWinte      x      x        x                                 x                            x
- ---------------------------------------------------------------------------------------------------------------------------
Bargoed              Wenvoe           x               x
- ---------------------------------------------------------------------------------------------------------------------------
Carhampton           Wenvoe           x               x           x                                      x
- ---------------------------------------------------------------------------------------------------------------------------
Countisbury          Wenvoe           x                           x
- ---------------------------------------------------------------------------------------------------------------------------
Easter Compton       Wenvoe           x               x           x
- ---------------------------------------------------------------------------------------------------------------------------
Gilfach              Wenvoe           x               x
- ---------------------------------------------------------------------------------------------------------------------------
Greenhill            Wenvoe           x               x 
- ---------------------------------------------------------------------------------------------------------------------------
Kewstoke             Wenvoe           x               x            x        x        
- ---------------------------------------------------------------------------------------------------------------------------
Pontardawe           Wenvoe           x               x
- ---------------------------------------------------------------------------------------------------------------------------
Pontvpool            Wenvoe           x               x
- ---------------------------------------------------------------------------------------------------------------------------
Redcliff Bay         Wenvoe           x               x            x        x
- ---------------------------------------------------------------------------------------------------------------------------
Roadwater            Wenvoe           x               x
- ---------------------------------------------------------------------------------------------------------------------------
Woodcombe            Wenvoe           x               x            x        x 
- ---------------------------------------------------------------------------------------------------------------------------
Llanddona/Prestat    Winter Hill                x     x                                 x                x
- ---------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      112
<PAGE>
 
                      SCHEDULE 9 - TABLE 2  SHEET 1 OF 2

        SCHEDULE OF WORK:  ANALOGUE MODIFICATIONS AT CO-SITED STATIONS

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------

SITE                               CO-SITED INTERFERING MULTIPLEX        MODIFY   MODIFY     PRECISION       REPLACE         
                              ----------------------------------------
                                     B           C           D            VSB    G. DELAY      OFFSET         DRIVE   
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                           <C>                <C>         <C>         <C>     <C>         <C>             <C>       
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------------
Aberdare                             x                                     x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Angus                                x           x                         x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Beacon Hill                          x           x           x             x         x                          x
- ------------------------------------------------------------------------------------------------------------------------------------
Belmont
- ------------------------------------------------------------------------------------------------------------------------------------
Bilsdale                                         x           x                       x
- ------------------------------------------------------------------------------------------------------------------------------------
Black Hill                           x                                               x
- ------------------------------------------------------------------------------------------------------------------------------------
Blaenplwyf                           x                                               x
- ------------------------------------------------------------------------------------------------------------------------------------
Bluebell Hill                        x           x           x             x         x
- -----------------------------------------------------------------------------------------------------------------------------------
Bressay                              x                                     x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Brierley Hill                        x                       x             x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Bristol Ilchester Crescent           x           x           x                       x
- ------------------------------------------------------------------------------------------------------------------------------------
Bristol Kings Weston
- ------------------------------------------------------------------------------------------------------------------------------------
Bromsgrove                           x           x           x             x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Brougher Mountain                    x           x           x                       x
- ------------------------------------------------------------------------------------------------------------------------------------
Caldbeck
- ------------------------------------------------------------------------------------------------------------------------------------
Caradon Hill                         x           x           x             x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Carmel                               x                       x             x         x           x              x
- ------------------------------------------------------------------------------------------------------------------------------------
Chatton                              x                                               x
- ------------------------------------------------------------------------------------------------------------------------------------
Chesterfield
- ------------------------------------------------------------------------------------------------------------------------------------
Craigkelly                           x                                     x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Crystal Palace                                   x           x                                   x
- ------------------------------------------------------------------------------------------------------------------------------------
Darvel                               x           x           x             x         x                          x
- -----------------------------------------------------------------------------------------------------------------------------------
Divis                                x                                               x
- ------------------------------------------------------------------------------------------------------------------------------------
Dover                                x                       x             x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Durris
- ------------------------------------------------------------------------------------------------------------------------------------
Eitshal                              x           x           x             x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Emley Moor                           x           x                         x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Fenham                               x           x                                   x
- ------------------------------------------------------------------------------------------------------------------------------------
Fenton                               x           x           x                       x
- ------------------------------------------------------------------------------------------------------------------------------------
Fremont Point
- ------------------------------------------------------------------------------------------------------------------------------------
Guildford                            x           x                                   x
- ------------------------------------------------------------------------------------------------------------------------------------
Hannington                                       x                                   x
- ------------------------------------------------------------------------------------------------------------------------------------
Hastings                             x                                     x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Heatherfield                                                 x             x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Hemel Hempstead                                  x           x             x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Huntshaw Cross                       x                                     x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Idle                                             x                         x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Keelylang Hill                       x           x           x                       x
- ------------------------------------------------------------------------------------------------------------------------------------
Keighley
- ------------------------------------------------------------------------------------------------------------------------------------
Kilvey Hill                          x                                     x         x
- ------------------------------------------------------------------------------------------------------------------------------------
Knock More
- ------------------------------------------------------------------------------------------------------------------------------------
Lancaster                            x                       x             x         x
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      113
<PAGE>
 
                      SCHEDULE 9 - TABLE 2  SHEET 2 OF 2

        SCHEDULE OF WORK:  ANALOGUE MODIFICATIONS AT CO-SITED STATIONS

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------
SITE                CO-SITED INTERFERING MULTIPLEX        MODIFY     MODIFY     PRECISION    REPLACE          
                    ------------------------------
                                                            VSB     G. DELAY      OFFSET      DRIVE        
- -----------------------------------------------------------------------------------------------------
<S>                 <C>           <C>         <C>         <C>       <C>         <C>          <C> 
                      B           C           D           
- -----------------------------------------------------------------------------------------------------

- -----------------------------------------------------------------------------------------------------
Larkstoke             X                                                  X
- -----------------------------------------------------------------------------------------------------
Limavady                          X           X             X            X
- -----------------------------------------------------------------------------------------------------
Llanddona             X           X                                      X            
- -----------------------------------------------------------------------------------------------------
Malvern               X                                     X            X
- -----------------------------------------------------------------------------------------------------
Mendip                X                                                  X           X        
- -----------------------------------------------------------------------------------------------------
Midhurst              X                       X                          X            
- -----------------------------------------------------------------------------------------------------
Moel-y-Parc
- -----------------------------------------------------------------------------------------------------
Nottingham
- -----------------------------------------------------------------------------------------------------
Olivers Mount         X           X           X                          X
- -----------------------------------------------------------------------------------------------------
Oxford                X                                     X            X
- -----------------------------------------------------------------------------------------------------
Pendle Forest         X                                     X            X
- -----------------------------------------------------------------------------------------------------
Plympton              X           X                         X            X
- -----------------------------------------------------------------------------------------------------
Pontop Pike           X           X           X             X            X           X
- -----------------------------------------------------------------------------------------------------
Pontypool
- -----------------------------------------------------------------------------------------------------
Presely               X           X           X             X            X           X
- -----------------------------------------------------------------------------------------------------
Redruth                           X           X             X            X
- -----------------------------------------------------------------------------------------------------
Reigate
- -----------------------------------------------------------------------------------------------------
Ridge Hill
- -----------------------------------------------------------------------------------------------------
Rosemarkie            X           X           X             X            X                      X
- -----------------------------------------------------------------------------------------------------
Rosneath              X           X                         X            X
- -----------------------------------------------------------------------------------------------------
Rowridge              X           X           X                          X
- -----------------------------------------------------------------------------------------------------
Rumster Forest        X                                                  X
- -----------------------------------------------------------------------------------------------------
Saddleworth           X                                     X            X
- -----------------------------------------------------------------------------------------------------
Salisbury             X                       X             X            X
- -----------------------------------------------------------------------------------------------------
Sandy Heath                                                                          X
- -----------------------------------------------------------------------------------------------------
Selkirk               X           X           X                          X
- -----------------------------------------------------------------------------------------------------
Sheffield
- -----------------------------------------------------------------------------------------------------
Stockland Hill        X           X           X             X            X
- -----------------------------------------------------------------------------------------------------
Storeton              X           X           X                          X
- -----------------------------------------------------------------------------------------------------
Sudbury                                       X             X            X
- -----------------------------------------------------------------------------------------------------
Sutton Coldfield      X                                                  X
- -----------------------------------------------------------------------------------------------------
Taconeston
- -----------------------------------------------------------------------------------------------------
The Wrekin            X                                                  X
- -----------------------------------------------------------------------------------------------------
Torosay               X           X           X             X            X
- -----------------------------------------------------------------------------------------------------
Tunbridge Wells       X                                                  X
- -----------------------------------------------------------------------------------------------------
Waltham                                                                  X
- -----------------------------------------------------------------------------------------------------
Wenvoe
- -----------------------------------------------------------------------------------------------------
Whitehawk Hill                    X           X                          X
- -----------------------------------------------------------------------------------------------------
Winter Hill                       X           X                          X
- -----------------------------------------------------------------------------------------------------
</TABLE>

                                      114
<PAGE>
 
                                  SCHEDULE 10

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      116
<PAGE>
 
                       SCHEDULE 11 -EMERGENCY EQUIPMENT
                         /DISASTER RECOVERY PROCEDURES

PART I - EMERGENCY RESERVE EQUIPMENT

BDB Exclusive Equipment:

 .  3 off 4kW containerised DTT transmitters including TIE; and

 .  3 off 1kW containerised DTT transmitters including TIE.

Interconnection cabling and instructions will be maintained in portable cases in
accordance with an agreed operational procedure.

CTI EXCLUSIVE EQUIPMENT:

 .  1 off modular DTT combining system with interconnecting feeder; and

 .  2 off Broadband 8 Lambda 4 panel UHF Antennas.

CTI/NTL SHARED EQUIPMENT:

Some of these facilities are shared with NTL. Items are fully maintained under
an annual maintenance plan and include:

 .  210m reserve mast;

 .  80m reserve tower;

 .  16 lambda main UHF antenna,

 .  4 lambda UHF antenna;

 .  5 inch feeder;

 .  3 inch feeder;

 .  UHF combiner: and

 .  documentation.

Adaptors and feeders for interconnecting points will be available at all sites.

Emergency facilities will be phased in appropriately as installations progress.

                                      117
<PAGE>
 
PART II- DISASTER RECOVERY PROCEDURES

In the event of a serious incident CTI will follow the procedures laid down in
the CTI Disasters and Emergencies Procedures Plan which is updated when
necessary and covers the following:

 .   security procedures;

 .   electric shock;

 .   loss of transmission facilities;
    mast collapse;
    loss of transmitters,
    emergency link procedure;
    local site plans;
    procedural testing;

 .   other emergencies;
    mast rescue;
    Falling Ice;
    bomb precautions; and

 .   a telephone list.

NOTIFICATION

In the event that a potentially catastrophic incident is detected, which will
impair or interrupt service from one or more Stations for an extended period,
CTI shall immediately notify the BDB Representative and initiate the CTI
Disasters and Emergencies Plan.

CTI and the BDB Representative will then jointly assess the implications of the
incident.

SERVICE PRIORITY

In the event of failure of more than one service at a Station, the order of
priority for service restoration will be in accordance with the CTI Disaster and
Emergencies Procedures Plan.

CTI will use reasonable endeavours not to show undue preference to any other
customer in the order of priority set out in the CTI Disaster and Emergency
Procedures Plan.

LOSS OF MAINS SUPPLY AND GENERATOR

In the event of fire destroying a mains supply and the backup generator
simultaneously, a containerised generator will be supplied within 24 hours on
hire.

                                      118
<PAGE>
 
LOSS OF COMPLETE TRANSMITTING STATION

In the event of the loss of a complete transmitting station, CTI will deploy the
containerised emergency transmitters and other equipment necessary to restore
the service.

An emergency container transmitter can be delivered to any site on the mainland
within 24 hours.

MAJOR DAMAGE TO MAST AND/OR ANTENNA SYSTEM

Following notification or identification of potential structural damage and an
initial assessment of potential safety hazards, named personnel will be
contacted to enable contingency plans to be initiated. These people are directly
responsible for the provision of the reserve facilities. Some of these
facilities are shared with NTL.

Service recovery times depend on the severity of damage. It is likely that the
erection time for the 210m mast would be four to five weeks. It could be
possible under favourable conditions to reduce this to about three weeks.

At smaller sites full service would be restored using cherry-pickers and cranes.

TECHNICAL OPERATIONS CENTRE (TOC)

The TOC has been designed to be fully resilient. A back-up to the TOC is located
at Sutton Coldfield providing duplication of the computer systems at the TOC.
Data communications from the Stations to these computer systems is via ISDN or
PSTN backup circuits which are instigated automatically without manual
intervention.

In the event that the TOC needs to be abandoned, staff would transfer to the
backup centre and the operation would be resumed within in one hour with no loss
of monitoring data. The transfer time will be minimised by providing remote or
mobile access to the backup centre.

                                      119
<PAGE>
 
                                  SCHEDULE 12

                              ADDITIONAL STATIONS

Until 31 December 2001 additional stations beyond those listed in Schedule 8
will be added to

the Network, as requested by BDB, in accordance with the Change Control
Procedures specified in Schedule 1. The basis for calculating the additional
Charge for each additional station shall be the sum of:

[*]

The provision of additional Stations from 1 January 2002 will be subject to
separate agreement between BDB and CTI.

Once the additional charge is calculated and agreed, Schedule 2 will be adjusted
accordingly.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      120
<PAGE>
 
EXECUTED by the parties

Signed by
for and on behalf of
BRITISH DIGITAL BROADCASTING PLC:


/s/                                           Signature
- ---------------------------------------------          


Signed by
for and on behalf of
CASTLE TRANSMISSION INTERNATIONAL LTD:


/s/                                          Signature
- --------------------------------------------          

                                      121
<PAGE>
 
                                    ANNEX 1

[*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      122
<PAGE>
 
ANNEX 1 - PART 1 [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

                                      123
<PAGE>
 
ANNEX I - PART II [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      124
<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.
                                      
                                      125

<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      126

<PAGE>
 
ANNEX I - PART III [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      127

<PAGE>
 
[*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

                                      128

<PAGE>
ANNEX 1 - PART IV [*]

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
                                      
                                      129

<PAGE>
 
ANNEX 2 DRAFT MULTIPLEX LICENCE

                                      130
<PAGE>
 
                                 THE SCHEDULE

Index To Conditions

PART 1

<TABLE>
<S>                                                                          <C>
 1.       Definitions and Interpretation...................................   2
 2.       Provision of Multiplex Service by the Licensee...................   5
 3.       Fees.............................................................   5
 4.       Additional Payments..............................................   6
 5.       Interest on Late Payments and V.A.T..............................   7
 6.       Transmission Arrangements, Technical Standards and Requirements..   7
 7.       Availability of Capacity on the Frequencies......................   8
 8.       Provision of Information to the Commission.......................   8
 9.       Renewal of the Licence...........................................  11
10.       Fair and Effective Competition...................................  13
11.       Restrictions on the Holders of Multiplex Licences................  15
12.       Transferability of the Licence...................................  15
13.       Compliance.......................................................  16
14.       Prohibition on Conveyance of Unlicensed Services.................  16
15.       Government Directions............................................  16
16.       Complaints Received from the Public..............................  17
17.       Power of the Commission to Vary License Conditions...............  17
18.       Publication of Tariffs...........................................  18
19.       Equal Opportunities..............................................  18
20.       Notices..........................................................  19
21.       Exception and Limitation on the Licensee's Obligations...........  20
22.       Sanctions for Breaches of Condition..............................  21
23.       Revocation.......................................................  22 
</TABLE>

Annex:  The Licensed Service

<TABLE>
<S>                                                             <C>
Definitions and Interpretation................................. 25
Part I - Conditions relating to Digital Programme Services..... 26
Part II - Conditions relating to Digital Additional Services... 28
Part III - Conditions relating to Promoting or assisting the
            acquisition of equipment........................... 29
Part IV - Conditions relating to the Technical Plan............ 30
Part V - Details of Broadcasting Stations...................... 33
Part VI - Additional Information............................... 40
Part VII - Conditions coming into force on the Date of Grant... 41
Confidential Appendix..........................................
</TABLE>

                                       1
<PAGE>
 
                                       2

                                    PART 1

1.   DEFINITIONS AND INTERPRETATION

(1)  In these Conditions and in the Conditions in the Annex unless the context
     otherwise requires:

     references to any "ACCOUNTING PERIOD" of the Licensee shall be interpreted
     in accordance with Section 13(6) of the 1996 Act and the Statement of
     Principles on multiplex revenue;

     "THE 1990 ACT" means the Broadcasting Act 1990 as amended by the 1996 Act;

     "THE 1996 ACT" means the Broadcasting Act 1996;

     "BODY" means a body of persons whether incorporated or not, and includes a
     partnership;

     "BSKYB" means British Sky Broadcasting Group PLC, a company incorporated
     under the laws of England (registered number 2247735) whose registered
     office is at Grant Way, Isleworth, Middlesex TW7 5QD;

     "BSKYB LIMITED" means British Sky Broadcasting Limited, a company
     incorporated under the laws of England (registered number 2906991) whose
     registered office is at Grant Way, Isleworth, Middlesex TW7 5QD;

     "BSB HOLDINGS" means BSB Holdings Limited, a company incorporated under the
     laws of England (registered number 2042233) whose registered office is at 3
     Burlington Gardens, London W1X 1LB;

     "CODE OF PRACTICE ON CHANGES TO EXISTING TRANSMISSION AND RECEPTION
     ARRANGEMENTS" means the code governing the standards and requirements
     relating to changes and modifications to transmission and reception
     arrangements for existing terrestrial television services required as a
     result of the transmission of the Licensed Service as drawn up from time to
     time revised by the Commission;

     "COMMENCEMENT DATE" means the date one year after the Date of Grant, or
     such earlier date as the Licensee may notify to the Commission in writing
     or such later date as may be agreed in writing between the Commission and
     the Licensee;

     references to a "CONNECTED PERSON" in relation to the Licensee shall be
     interpreted in accordance with paragraph 3 of Part I of Schedule 2 to the
     1990 Act;

     references to "DIGITAL ADDITIONAL SERVICES" shall be interpreted in
     accordance with Section 24 of the 1996 Act;

     references to "DIGITAL PROGRAMME SERVICES" shall be interpreted in
     accordance with Section 1(4) of the 1996 Act;

     "DIGITAL TECHNICAL PERFORMANCE CODE" means the code governing technical
     standards and practice in the provision of licensed services and qualifying
     services as drawn up and from time to time revised by the Commission;
<PAGE>
 
                                       3

     "DISABLED PERSON" has the same meaning as in the Disability Discrimination
     Act 1995;

     "FREQUENCIES" means the frequencies designated by UHF Channel numbers in
     Part V of the Annex and a "FREQUENCY" means any of the Frequencies;

     "INITIAL LICENCE PERIOD" means the period of twelve years from and
     including the Commencement Date or, if shorter, the period from and
     including the Commencement Date until such date as the Licence is revoked
     in accordance with these Conditions;

     any reference to a person or group of persons acting together having an
     "INTEREST" of a particular percentage (or of more than a particular
     percentage) in a body corporate is a reference to a person or group of
     persons acting together who:

     (a)  holds or is beneficially entitled to that percentage (or more than
          that percentage) of the shares in that body; or

     (b)  possesses that percentage (or more than that percentage) of the voting
          power in that body;

     "LICENCE PERIOD" means the Initial Licence Period or any Subsequent Licence
     Period, as the context shall require;

     "LICENCED AREA" means the coverage area achieved when the programmes in the
     licensed services and the qualifying services included in the Licensed
     Service are transmitted by wireless telegraphy from the stations specified
     in Part V of the Annex (as varied from time to time pursuant to the proviso
     to Condition 2(2)), subject to such stations being operated in accordance
     with the Digital Technical Performance Code and otherwise in accordance
     with the details set out in Part V of the Annex;

     "LICENSED SERVICES" means services licensed by the Commission under Part I
     of the 1996 Act;

     references to "MULTIPLEX REVENUE" in relation to the Licencee shall be
     interpreted in accordance with Sections 14 and 37 of the 1996 Act and the
     Statement of Principles drawn up and revised from time to time by the
     Commission in consultation with the Secretary of State and the Treasury
     pursuant to Part I of Schedule 1 to the 1996 Act;

     "PRESCRIBED AMOUNT" means:

     (a)   where:

           (i)  the Licence is revoked under Section 11 of the 1996 Act; or

     (ii)  the first complete accounting period of the Licencee falling within
           the Licence Period has not yet ended;

     seven percent of the amount which the Commission estimate would have been
     the multiplex revenue for that accounting period (as determined in
     accordance with Section 14 of the 1996 Act); or
<PAGE>
 
                                       4

     (b)  in any other case, seven percent of the multiplex revenue for the last
          complete accounting period of the Licencee so falling (as determined
          in accordance with Section 14 of the 1996 Act);

     "PROGRAMME", save where otherwise specified, includes an advertisement and
     any item included in the Licensed Service;

     references to "PROGRAMME-RELATED SERVICES" shall be interpreted in
     accordance with Section 12(4)(b) of the 1996 Act;

     references to "QUALIFYING SERVICES" shall be interpreted in accordance with
     Section 2 of the 1996 Act;

     "RACIAL GROUP" has the same meaning as in the Race Relations Act 1976;

     "RELEVANT DATE" means the date which the Commission determines to be that
     by which it would need to publish a notice under Section (7)(1) of the 1996
     Act if it were to grant, as from the date on which the Licence would expire
     if not renewed, a fresh license to provide the Licensed Service.

     "RELEVANT PERCENTAGE OF MULTIPLEX REVENUE" means such percentage of the
     multiplex revenue in relation to each accounting period of the Licencee
     during the Licence Period as the Commission may specify pursuant to
     Condition 9(5), which percentage may be different for different accounting
     periods and may be a nil percentage;

     "SUBSEQUENT LICENCE PERIOD" means the period of twelve years from and
     including the date on which the Licence is renewed in accordance with
     Condition 9 or, if shorter, the period from and including the date on which
     the Licence is renewed until such date as it is revoked in accordance with
     these Conditions;

     "TECHNICAL PLAN" means the technical plan relating to the Licensed Service
     which accompanied the Licencee's application for the Licence pursuant to
     Section 7(4)(b) of the 1996 Act; and

     references to "TECHNICAL SERVICES" shall be interpreted in accordance with
     Section 24(3) of the 1996 Act and to "RELEVANT TECHNICAL SERVICES" shall be
     interpreted in accordance with Section 12(4)(c) of the 1996 Act.

(2)  The Interpretation Act 1978 shall apply for the purpose of interpreting
     these Conditions as if they were an Act of Parliament.

(3)  Any word or expression used in these Conditions shall unless otherwise
     defined herein and/or the context otherwise requires have the same meaning
     as it has in the 1990 Act or in the 1996 Act, as the case may be.

(4)  For the purposes of interpreting these Conditions headings and titles to
     any Condition shall be disregarded.

(5)  This Licence shall be governed by English law.
<PAGE>
 
                                       5

                                     PART 2

2.   PROVISION OF MULTIPLEX SERVICE BY THE LICENSEE

(1)  The Licencee shall provide the Licensed Service for the Licence Period in
     the Licenced Area and in accordance with the Conditions set out in the
     Annex.

(2)  Subject to the Conditions set out in the Annex, the Licencee shall ensure
     that the licensed services and the qualifying services broadcast in the
     Licensed Service are transmitted from the stations specified in, and
     otherwise in accordance with Part V of the Annex and on each day of the
     week. Provided that the Commission may (having first consulted the
     Licencee) from time to time by notice to the Licencee amend Part V of the
     Annex:

     (a)  by substituting for any station or stations therein referred to, a
          reference to any other station or stations serving substantially the
          whole of the area previously served by the stations so substituted;
          and/or

     (b)  by adding to the stations therein referred to a reference to an
          additional station or stations serving an additional area, whether or
          not such additional area is served in whole or in part by another
          station from which the licensed services and the qualifying services
          are broadcast in the Licensed Service; and/or

     (c)  by deleting references to any station or stations where such deletion
          is required pursuant to the revocation by the Secretary of State,
          pursuant to Section 6(3) of the 1996 Act of the assignment of any
          Frequency;

     and any such variation shall take effect on such date or event as the
     Commission shall in such notice specify whereupon Part V of the Annex shall
     be deemed to have been amended so as to include particulars of the
     broadcasting stations as so varied.

(3)  Nothing in this Licence shall constitute or imply any warranty,
     representations or obligation on the part of the Commission as to the size
     or location of the areas actually capable of receiving the programmes in
     the licensed services and the qualifying services broadcast in the Licensed
     Service provided by the Licencee pursuant to the Licence or that licensed
     services and qualifying services provided by the holder of any other
     license (including a multiplex service license) shall not be capable of
     reception in the whole or any part of the Licenced Area.

(4)  The Licencee shall not be authorised by or under the Licence to broadcast
     or procure the broadcasting of anything other than the Licensed Service.

3.   FEES

(1)  The Licencee shall pay to the Commission such fees as the Commission may
     determine in accordance with the tariff fixed by it and for the time being
     in force under Section 4(3) of the 1996 Act, details of which, and of any
     revision whereof, the Commission shall provide to the Licencee in writing.

(2)  Payment of the fees referred to in Condition 3(1) shall be made in such
     manner as the Commission shall specify provided that unless the Commission
     specifically otherwise requires:
<PAGE>
 
                                       6

     (a)  where the annual amount of the fee is less than the Designated Amount,
          it shall be payable on the Date of Grant and on each anniversary
          thereof prior to or during the Licence Period; and

     (b)  where the annual amount of the fee is equal to or more than the
          Designated Amount, it shall be payable in advance by equal monthly
          instalments commencing on the Date of Grant and continuing thereafter
          until the expiry of the Licence Period.

(3)  For the purposes of this Condition 3, the "DESIGNATED AMOUNT" means the sum
     of (Pounds)25,000, or such other sum as the Commission may from time to
     time specify.

4.   ADDITIONAL PAYMENTS

(1)  The Licencee shall pay to the Commission in respect of each accounting
     period of the Licencee falling within the Licence Period an amount
     representing the Relevant Percentage of multiplex revenue.

(2)  The Commission may:

     (a)  before the beginning of any accounting period of the Licencee,
          estimate the amount representing the Relevant Percentage of multiplex
          revenue for that accounting period (and the Licencee shall pay such
          estimated amount (the "ESTIMATED AMOUNT") by equal monthly instalments
          on the twenty-seventh day of each month throughout that accounting
          period); and

     (b)  at such times as it shall think fit revise the Estimated Amount and
          adjust the instalments payable by the Licencee to take account of any
          such revision.

(3)  (a)  The Licencee shall pay to the Commission a sum equal to the amount (if
          any) by which the amount of the Relevant Percentage of multiplex
          revenue in respect of any accounting period of his exceeds the
          Estimated Amount actually paid by him to the Commission in respect of
          that period; and

     (b)  the Commission shall pay or procure the payment to the Licencee of a
          sum equal to the amount (if any) by which the amount of the Relevant
          Percentage of multiplex revenue in respect of any accounting period of
          the Licencee is less than the Estimated Amount actually paid by the
          Licencee to the Commission in respect of that period,

     and the sum payable by the Licencee shall be paid within 14 days of the
     date on which the Commission shall notify the Licencee of the amount of the
     Relevant Percentage of multiplex revenue in respect of such accounting
     period.

(4)  Payments under this Condition 4 shall be made in such manner as the
     Commission shall specify.

(5)  This Condition shall not have effect:

     (a)  in relation to the Initial Licence Period; or
<PAGE>
 
                                       7

     (b)  in relation to the Subsequent Licence Period if, pursuant to Section
          16(8) of the 1996 Act, the Commission specify (with the consent of the
          Secretary of State) that no relevant percentage of multiplex revenue
          is payable for that period.

5.   INTEREST ON LATE PAYMENTS AND V.A.T.

(1)  Any payment due from the Licencee under or in respect of this Licence shall
     carry interest at three percent over the base rate for the time being of
     National Westminster Bank PLC (or if unavailable then the rate published by
     another clearing bank as selected by the Commission) from the date such
     payment was due until the date of actual payment.

(2)  The Licencee's liability to pay to the Commission the amounts payable by
     him under Condition 5(1) shall accrue from day to day and shall be
     calculated on the basis of a year of 365 days and for the actual number of
     days elapsed.

(3)  (a)  The Licencee shall pay any V.A.T. on any supply for V.A.T. purposes by
          the Commission under the Licence.

     (b)  Without limitation to paragraph (a) above, all sums payable or other
          consideration to be given by the Licencee are exclusive of V.A.T.
          which shall be paid by the Licencee in addition to such sums or
          consideration.

     (c)  In this Condition 5(3) V.A.T. means value added tax and any similar
          tax.

6.   TRANSMISSION ARRANGEMENTS, TECHNICAL STANDARDS AND REQUIREMENTS

(1)  The Licencee shall do all he can to ensure that the signals carrying the
     Licensed Service attain high standards in terms of technical quality and
     reliability throughout so much of the Licenced Area as is for the time
     being reasonably practicable and in particular, (but without prejudice to
     the generality of the foregoing) the Licencee shall do all that he can to
     ensure that the relevant provisions of the Digital Technical Performance
     Code are observed in all operations under his direct control and by any
     third parties involved in the provision of programmes in the licensed
     services and qualifying services broadcast in the Licensed Service or in
     the provision and operation of a system for the distribution and
     transmission of the Licensed Service.

(2)  The Licencee shall at all times comply with the Code of Practice on Changes
     to Existing Transmission and Reception Arrangements adopted by the
     Commission from time to time and without prejudice to the generality of the
     foregoing the Licencee shall:

     (a)  do all that he can to secure that all work required in accordance with
          the Code of Practice on Changes to Existing Transmission and Reception
          Arrangements in connection with the equipment used for the
          transmission of existing terrestrial television services in order to
          accommodate the transmission of the Licensed Service is carried out in
          a proper manner before the commencement of transmissions of the
          Licensed Service from each of the stations specified in Part V of the
          Annex;

     (b)  not commence transmissions of the Licensed Service from any of the
          stations specified in Part V of the Annex until the work referred to
          in paragraph 2(a) of this Condition in connection with such
          transmissions from such stations has been completed;
<PAGE>
 
                                       8

     (c)  promptly and in a proper manner carry out all work required in
          accordance with the Code of Practice on Changes to Existing
          Transmission and Reception Arrangements in order to maintain the
          reception of existing terrestrial services by viewers affected by the
          changes to the transmission arrangements for those services described
          in the said Code without any cost or expense to those viewers; and

     (d)  promptly and in a proper manner carry out all the work required in
          accordance with the Code of Practice on Changes to Existing
          Transmission and Reception Arrangements in order to restore the
          reception of existing terrestrial television services by viewers
          affected by interference caused by the transmission of the Licensed
          Service in the cases identified in the said Code without any cost or
          expense to those viewers.

(3)  The Licensee shall comply with the Guidance Note on Test Transmissions,
     governing transmissions made by the Licensee from any of the stations
     specified in Part V of the Annex before the commencement of the Licensed
     Service from such stations, as drawn up and from time to time reviewed by
     the Commission.

(4)  The Licensee shall ensure that the Licensed Service uses a transmission
     system complying with Article 2 of Council Directive 95/47/EC on the use of
     standards for transmission of television signal;

(5)  Where the Commission specify a particular Community digital standard in
     accordance with Section 142 of the 1996 Act (the "COMMUNITY DIGITAL
     STANDARD") the Licensee shall ensure that the Licensed Service uses a
     transmission system meeting the Community Digital Standard.

7.   AVAILABILITY OF CAPACITY ON THE FREQUENCIES

(1)  The Licensee shall ensure that, during the License Period, at least 90
     percent (or such other percentage as the Secretary of State may from time
     to time by order specify pursuant to Section 12(5) of the 1996 Act) of
     digital capacity on the Frequencies is available for the broadcasting of
     digital programme services, qualifying services, programme-related services
     or relevant technical services.

(2)  For the purpose of Condition 7(1) "QUALIFYING SERVICES" shall be
     interpreted in accordance with Section 12(4)(a) of the 1996 Act.

8.   PROVISION OF INFORMATION TO THE COMMISSION

(1)  The Licensee shall furnish to the Commission in such manner and at such
     times as the Commission may reasonably require such documents, accounts,
     returns, estimates, reports or other information as the Commission may
     require for the purpose of exercising the functions assigned to it by or
     under the 1990 Act or the 1996 Act in relation to multiplex services and in
     particular (but without prejudice to the generality of the foregoing):

     (a)  the Licensee will notify the Commission:

          (i)  of any change in the persons having control over the Licensee, or
               in the directors of the Licensee or the directors of any body
               corporate which controls the Licensee, within 28 days of the
               occurrence of such change;
<PAGE>
 
                                       9

          (ii)   of any change in the persons having interests in the Licensee
                 so that a person or group of persons acting together:

                 (A)  has acquired an interest of more than twenty percent, in
                      the Licensee or in any body corporate which controls
                      Licensee; or

                 (B)  having an interest of more than twenty percent, in the
                      Licensee or in any body corporate which controls the
                      Licensee, has increased such interest;

                 within 28 days of the Licensee becoming aware of such change:

          (iii)  of any change in the persons having interests in the Licensee
                 where an interest or interests notified to the Commission in
                 Condition 8(1)(a)(ii)(A) or (B) falls to twenty percent or
                 below within 28 days of the Licensee becoming aware of such
                 change; and

          (iv)   of any change in the persons having interests in the Licensee
                 where such interest would cause the Licensee to be a
                 disqualified person pursuant to Schedule 2 to the 1990 Act or
                 cause any of the restrictions or requirements imposed on or in
                 relation to the holders of multiplex service licences by or
                 under Schedule 2 to the 1990 Act not to be complied with to the
                 extent that such requirements apply to him immediately upon the
                 Licensee becoming aware of such change;

     (b)  the Licensee shall, save insofar as such matters have been notified to
          the Commission pursuant to paragraph (a) above, notify the Commission
          within 28 days of the occurrence of:

          (i)    all matters, notice of which is required to be given to the
                 Registrar of Companies under Parts V and/or XXIII of the
                 Companies Act 1985; or

          (ii)   (where the Licensee is not incorporated in England and Wales or
                 Scotland) such similar or analogous matters under the laws of
                 any applicable jurisdiction is the Commission may from time to
                 time specify.

(2)  The Licensee shall ensure that any person authorised in writing by the
     Commission is permitted at reasonable times to enter any premises of the
     Licensee or of any connected person in order to:

     (a)  inspect, examine, operate or test any equipment on the premises which
          is used in connection with the provision of the Licensed Service; and

     (b)  inspect and examine all statutory books and financial and other
          business records of the Licensee and to take such copies thereof as
          may in the opinion of the Commission be necessary or desirable to
          enable it to discharge its functions under the 1990 Act and/or the
          1995 Act.
<PAGE>
 
                                      10

(3)  The Licensee shall within 28 days of a request therefor provide the
     Commission with such information as it may require for the purposes of
     determining or revising the tariff referred to in Condition 3(1).

(4)  The Licensee shall as soon as reasonably practicable following a request
     therefor provide the Commission with such information as it may require for
     the purposes of determining whether the Licensee has acted and is acting in
     accordance with the provisions of Condition 10, including, without
     limitation, Condition 10(2) and Condition 10(6).

(5)  The Licensee shall as soon as reasonably practicable following a request
     therefor provide the Commission with such information as it may require for
     the purposes of determining wither the Licensee has complied and is
     complying with the Conditions set out in the Annex, including, without
     limitation, the Conditions set out in Part III of the Annex relating to
     acquisition of equipment.

(6)  The Licensee shall supply to the Commission:

     (a)  (i)   in relation to himself and any body which controls the Licensee
                (where a body corporate) a copy of his annual return at the same
                time as it is filed with the Registrar of Companies in
                accordance with Section 363 of the Companies Act 1985 and a copy
                of his annual report and accounts as soon as possible after they
                are circulated to the shareholders of the relevant body
                corporate; or

          (ii)  (where the Licensee is not incorporated in England and Wales or
                Scotland) any returns, reports, accounts or other information
                under the laws of any applicable jurisdiction which is, in the
                opinion of the Commission, analogous or equivalent to the above,
                at such times and in such form as the Commission shall from time
                to time specify;

     (b)  half-yearly income and expenditure returns and supplementary annexes
          in such form and at such times as the Commission shall require;

     (c)  statements of his multiplex revenue at such intervals as the
          Commission may specify and also in respect of each entire accounting
          period of his in such form as the Commission shall require;

     (d)  post-transmission data in relation to the programmes included in the
          licensed service and qualifying services which are broadcast in the
          Licensed Service covering such information and in such form as the
          Commission shall specify, such data to be delivered to the Commission
          as soon after transmission of the programmes to which they relate as
          the Commission may require;

     (e)  tapes/recordings of such parts of the Licensed Services as the
          Commission shall from time to time require for the purposes of
          monitoring the technical performance of the Licensee;

     (f)  such technical performance data as the Commission shall from time to
          time to time require, at such intervals and in such form as the
          Commission shall specify;
<PAGE>
 
                                       11

     (g)  such information as the Commission may reasonably require from time to
          time for the purposes of determining whether the Licensee on any
          ground is a disqualified person by virtue of any of the provisions in
          Section 143(5) of the 1996 Act; and

     (h)  such information as the Commission may reasonably require from time to
          time in relation to each person providing digital programme services
          broadcast in the Licensed Service as to the number of points
          attributable to each such person in respect of such digital programme
          services calculated in accordance with paragraph 7 of Part III of
          Schedule II of the 1990 Act.

(7)  The Licensee shall supply to the Commission in relation to such periods, in
     such form and at such times as the Commission shall require, information as
     to the percentage of digital capacity available on the Frequencies for the
     broadcasting of digital programme services, qualifying services, programme-
     related services or relevant technical services.

(8)  The Licensee shall inform the Commission when judgment is awarded against
     him in any court proceedings brought against him in respect of the
     inclusion of the Licensed Services of any defamatory, seditious,
     blasphemous, or obscene matter, or any matter which constitutes an
     injurious falsehood or slander of title, or any tort or an infringement of
     any copyright, moral right, right in a performance, design right,
     registered design, service mark, trademark, letters patent, or other
     similar monopoly right or a contravention of the provisions of the Official
     Secrets Acts, or of any statutory enactment of regulation for the time
     being in force, or a criminal offense, or contempt of Court, or breach of
     Parliamentary privilege.

(9)  The Licensee shall supply the Commission with details of the procedures
     (and of any revision of such procedures) adopted by him and required to be
     observed by those involved in providing the Licensed Service for the
     purposes of Condition 13(2).

(10) The Licensee, if so requested by the Commission, shall at such intervals
     and at such times as the Commission shall require attend meetings with the
     Commission for the purpose of enabling the Commission to conduct periodic
     reviews of the performance by the Licensee of his obligations under the
     License.

9.   RENEWAL OF THE LICENSE

(1)  The Licensee may apply to the Commission for renewal of the License not
     earlier than four years before the end of the Initial License Period and
     not later than the Relevant Date.

(2)  If the Licensee makes an application before the Relevant Date, the
     Commission may postpone consideration of it for as long as the Commission
     thinks appropriate, having regard to Section 16(10) of the 1996 Act.

(3)  If the Licensee makes an application the Commission may (with the consent
     of the Secretary of State):

     (a)  require the Licensee to furnish:

          (i)  a technical plan which supplements the Technical Plan; and
<PAGE>
 
                                       12

          (ii) proposals which supplement any proposals submitted by the
               Licensee under Section 7(4)(f) of the 1996 Act; and

     (b)  notify the applicant of the requirements which must be met by the
          supplementary technical plan referred to in Condition 9(3)(a)(i) or
          the supplementary proposals referred to in Condition 9(3)(a)(ii) and
          which relate to he matters referred to in Section 7(4)(b)(i) and (ii)
          and (f) of the 1996 Act.

(4)  The Commission shall only refuse an application for renewal of the License
     by the Licensee made in accordance with the 1996 Act and this Condition if:

     (a)  it appears to the Commission that the Licensee has failed to comply
          with any of the Conditions in this License; or

     (b)  any supplementary technical plan submitted by the Licensee under
          Condition 9(3)(a)(i) fails to meet the requirements notified to the
          Licensee under Condition 9(3)(b); or

     (c)  any of the supplementary proposals submitted by the Licensee under
          Condition 9(3)(a)(ii) fails to meet the requirements notified to the
          Licensee under condition 9(3)(b); or

     (d)  the Commission is not satisfied that the Licensee would, if the
          License were renewed, provide a service which complied with the
          Conditions to be included in the License, as renewed.

(5)  On the grant of any such application:

     (a)  the Commission shall include in the License, as renewed, such further
          conditions as appear to the Commission to be appropriate for securing
          the implementation of any supplementary technical plan and any
          supplementary proposals submitted under Condition 9(3); and

     (b)  subject to Section 16(9) of the 1996 Act, the Commission may, with the
          consent of the Secretary of State, and shall, if so required by him
          specify a percentage of multiplex revenue as the percentage of
          multiplex revenue for each accounting period of the Licensee that will
          be payable by him during the period for which the License is to be
          renewed where no relevant percentage of multiplex revenue was
          specified under Section (1)(f) of the 1996 Act;

     and the Commission may specify under Condition 9(5)(b) either of the things
     mentioned in Section 7(2)(b) of the 1996 Act.

(6)  Where the Commission has granted an application of the Licensee for renewal
     of the License it shall formally renew his License from the date on which
     it would otherwise expire and it shall not so renew his License unless it
     has notified him of the percentage of multiplex revenue specified by it
     under Condition 9(5)(b) and he has, within such period as the Commission
     shall specify in the notification, notified it in writing that he consents
     to the License being renewed on those terms.
<PAGE>
 
                                       13

MISSING
<PAGE>
 
                                       14

MISSING
<PAGE>
 
                                       15

11. RESTRICTIONS ON THE HOLDERS OF MULTIPLEX LICENCES

(1) The Licensee shall comply in all respects with the restrictions or
    requirements imposed on or in relation to him as the holder of a multiplex
    licence by or under Schedule 2 to the 1990 Act to the extent that they apply
    to him.

(2) The Licensee shall comply with any direction of the Commission requiring him
    to take or arrange for the taking of, any steps specified by the Commission
    for the purposes of complying with the requirements imposed by or under
    Parts III to V or Schedule 2 to the 1990 Act.

12. TRANSFERABILITY OF THE LICENCE

    The Licence is not transferable except with the prior consent in writing of
    the Commission which consent shall not be given unless the Commission is
    satisfied that the person or persons
<PAGE>
 
                                       16

    to whom it is proposed to transfer the Licence would be in a position to
    comply with all of the Conditions hereto throughout the remainder of the
    Licence Period.

13  COMPLIANCE

(1) The Licensee shall comply with any direction given to him by the Commission
    in respect of any matter, which direction is in the opinion of the
    Commission appropriate, having regard to any duties which are or may be
    imposed on it or on the Licensee by or under the 1990 Act or the 1996 Act.

(2) Licensee shall adopt procedures and procure that such procedures are
    observed by those involved in providing the Licensed Service for the
    purposes of ensuring that the provisions of this Licence, the 1990 Act, the
    1996 Act, and any codes or guidelines herein or therein referred to (the
    "CODES" and "GUIDELINES" respectively) are complied with in connection with
    the provision of the Licensed Service.  The Licensee shall, without
    prejudice to the generality of the foregoing, ensure:

    (a)   that there are sufficient persons amongst those involved in providing
          the Licensed Service who are adequately versed in the requirements of
          this Licence, the 1990 Act, the 1996 Act, and the Codes and Guidelines
          and that such persons are able to ensure compliance with such
          requirements on a day to day basis;

     (b)  that adequate arrangements exist for the immediate implementation of
          such general and specific directions as may from time to time be given
          to the Licensee by the Commission; and

     (c)  that in each department of the Licensee where any of the procedures
          referred to in this Condition are to be implemented the member of
          staff responsible is of sufficient seniority to ensure immediate
          action and that issues relating to compliance may be brought where
          necessary directly before senior management for consideration.

14.  PROHIBITION ON CONVEYANCE OF UNLICENSED SERVICES

(1)  The Licensee shall ensure that:

     (a)  all digital programme services broadcast under this Licence are
          provided by the holder of a licence under Section 18 of the 1996 Act;
          and

     (b)  all digital additional services broadcast under this Licence are
          provided by the holder of a licence under Section 25 of the 1996 Act.

(2)  This Condition shall not apply to the provision of a digital programme
     service or a digital additional service by a person established and
     licensed (if required) to provide such a service in another EEA member
     state.

15.  GOVERNMENT DIRECTIONS

(1)  The Licensee shall, if so directed by the Commission from time to time:

     (a)  publish in the Licensed Service, at such times as may be specified to
          the Commission by the Secretary of State or any other Minister of the
          Crown, such announcement as

          may be specified by a notice given pursuant to Section 10(1) of the
          1990 Act (as applied by the 1996 Act), with or without visual images
          of any picture, scene or object mentioned in the announcement; or

     (b)  refrain from including in the programmes included in the Licensed
          Service any matter or classes of matter specified to the Commission by
          the Secretary of State pursuant to Section 10(3) of the 1990 Act (as
          applied by the 1996 Act).

(2)  The Licencees may when publishing an announcement in the Licensed Service
     in accordance with Condition 15(1)(a) indicate that the announcement is
     made in pursuance of a direction by the Commission.
<PAGE>
 
                                       17

(3)  The Licensee shall comply with all directions given to him by the
     Commission pursuant to a direction of the Secretary of State for the
     purpose of enabling Her Majesty's Government in the United Kingdom or give
     effect to any international obligations of the United Kingdom.

(4)  Where the Commission:

     (a)  has given the Licensee a direction to the effect referred to in
          Condition 15(1)(b); or

     (b)  in consequence of the revocation by the Secretary of State of the
          notice giving rise to the issuing of such direction, has revoked such
          a direction.

     or where such a notice has expired, the Licensee may publish in the
     Licensed Service an announcement of the giving or revocation of the
     direction or of the expiration of the notice, as the case may be.

16.  COMPLAINTS RECEIVED FROM THE PUBLIC

(1)  (a)  The Licensee shall adopt procedures acceptable to the Commission for
          handling complaints received from the public in respect of the
          Licensed Service and shall ensure that such procedures are duly
          observed.

     (b)  Such procedures shall, inter alia, include a requirement that members
          of the public who complain to the Licensee about the Licensed Service
          are informed that they have the right to refer the matter complained
          of to the Commission.

(2)  The Licensee shall for a period of two years keep a written record of any
     complaints received from the public in respect of the Licensed Service and
     of any response given in relation to any such complaint by the Licensee and
     shall make such records available to the Commission in writing at such
     times as the Commission may require.

17.  POWER OF THE COMMISSION TO VARY LICENCE CONDITIONS

(1)  The Commission may by a notice served on the licensee:

     (a)  vary the Licence Period provided that the Licensee consents to such
          variation (and without prejudice to the Commission's powers and duties
          under Section 17 of the 1996 Act); 
<PAGE>
 
                                       18

     (b)  vary any Conditions set out in Parts I, II, III and IV of the Annex
          provided that the Licensee consents to such variation; and

     (c)  vary the Licence in any respect not mentioned in paragraphs (a) and
          (b) above provided that the Licensee has been given a reasonable
          opportunity to make representations to the Commission concerning the
          proposed variation;

     Provided always that paragraph (a) and (c) above shall not authorise the
     variation of Condition 4 to the extent that Condition requires the payment
     by the Licensee to the Commission of in respect of each accounting period
     of the Licensee falling within the Licence Period, an amount representing
     the Relevant Percentage of multiplex revenue.

(2)  If the Licensee applies to the Commission for the variation of Conditions
     in the Annex which relate to the characteristics of the digital programme
     services to be broadcast in the Licensed Service, the Commission shall
     permit the variation requested unless it appears to the Commission that if
     the application is granted, the capacity of the digital programme services
     broadcast in the Licensed Service to appeal to a variety of tastes and
     interests would be unacceptably diminished provided that in deciding
     whether or not to permit such variation, the Commission may have regard to
     the digital programme services broadcast in all the multiplex services for
     the time being provided by the Licensee or any connected person in relation
     to the Licensee.


18.  PUBLICATION OF TARIFFS

     In pursuance of Regulation 12 of the Advanced Television Services
     Regulations 1996 (SI 1996/3151), in relation to the delivery of digital
     television services, the Licensee shall publish a list of tariffs for the
     viewer which takes into account whether associated equipment is supplied or
     not provided that it shall be a sufficient compliance by the Licensee if he
     ensures that each person who provides a television programme service within
     Regulation 12 for broadcasting in the Licensed service complies with this
     requirement in full.

19.  EQUAL OPPORTUNITIES

(1)  The Licensee shall:

     (a)  make arrangements for promoting, in relation to employment by the
          Licensee, equality or opportunity between men and women and between
          persons of different racial groups;

     (b)  make arrangements for promoting, in relation to employment by the
          Licensee, the fair treatment of disabled persons; and

     (c)  review those arrangements from time to time.

(2)  In particular (but without limitation to the generality of paragraph 1 of
     this Condition) the Licensee:

     (a)  shall ensure that no job applicant or employee receives less
          favourable treatment on the grounds of sex, race, colour, creed,
          nationality, or ethnic or national origins or disability, or on such
          grounds is disadvantaged by conditions or requirements which cannot be
          shown to be justifiable; 
<PAGE>
 
                                       19

     (b)  shall review his selection criteria and procedures at regular
          intervals and will monitor the composition of his workforce and of job
          applicants and will take action to correct any inequalities or unfair
          treatment which come to his notice; and

     (c)  if so requested by the Commission shall at such intervals as the
          Commission may require provide a statement to the Commission of the
          action he has taken to give effect to such equal opportunities and
          fair treatment policy, and the Commission may, at its discretion, make
          such statement in whole or in part public.

20.  NOTICES

(1)  Any notice or notification to be served or given under or in relation to
     this Licence shall be in writing and may be delivered to the party to be
     served or sent by first class post at his proper address (as defined in
     Section 199(4) of the 1990 Act) or left at that address.

(2)  Any such notice or notification shall be deemed to have been served:

     (i)  if so delivered or left, at the time of delivery or leaving; or

     (ii) if so posted, at 10:00 a.m. on the second business day after it was
          put into the post.

(3)  In proving such service it shall be sufficient to prove that delivery was
     made or that the envelope containing such notice or notification was
     properly addressed and posted as a prepaid first class letter or was left
     at the proper address, as the case may be.
<PAGE>
 
                                       20

                                    PART 3

21.  EXCEPTION AND LIMITATION ON THE LICENSEE'S OBLIGATIONS

     The Licensee shall not be in any way responsible for any failure to provide
     the Licensed Service directly or indirectly caused by or arising from any
     circumstances beyond the control of the Licensee including (without
     limitation) accident or breakdown of any equipment or apparatus (caused
     otherwise than by the wrongful act, neglect or default of the Licensee, its
     servants or agents), force majeure, war, damage by the Queen's enemies,
     riot, rebellion, civil commotion, interference by strike, lockout, sit-in,
     picket or other industrial dispute or action.
<PAGE>
 
                                      21

                                    PART 4

22.  SANCTIONS FOR BREACHES OF CONDITION

(1)  (a)  If the Commission is satisfied that the Licensee has failed to comply
          with any Condition of the Licence or with any direction given by the
          Commission under the Licence and it has given him a reasonable
          opportunity of making representations to it about the matters
          complained of, it may serve on the Licence a notice requiring him to
          pay to the Commission, within a specified period, a specified
          financial penalty.

     (b)  The amount of any financial penalty imposed pursuant to Condition
          22(1)(a) shall not exceed whichever is the greater of (Pounds)50,000
          (or such other sum as the Secretary of State may by order specify
          under Section 36 of the 1996 Act) or the amount determined under
          Condition 22(1)(c).

     (c)  The amount referred to in Condition 22(1)(b) is:

          (i)  three per cent of the share of multiplex revenue attributable to
               the Licensee for his last complete accounting period (as
               determined in accordance with Section 15 of the 1996 Act) in a
               case where a penalty under Section 17 of the 1996 Act has not
               previously been imposed on the Licensee during any period for
               which the Licence has been in force (the "relevant period"); and

          (ii) in any other case five per cent or the share of multiplex revenue
               attributable to the Licensee for his last complete accounting
               period (as determined in accordance with Section 15 of the 1996
               Act).

     (d)  Where any such penalty is imposed when the Licensee's first complete
          accounting period falling within the relevant period has not yet
          ended, the amount referred to in Condition 22(1)(c) shall not exceed
          three, or (as the case may be) five, per cent or the amount which the
          Commission estimates to be the share of multiplex revenue attributable
          to the License for that accounting period (as determined in accordance
          with Section 15 of the 1996 Act).

(2)  (a)  If the Commission is satisfied that the Licensee has failed to comply
          with any Condition of this Licence or with any direction given to him
          hereunder and it has given him a reasonable opportunity of making
          representations to it about the matters complained of, it may serve on
          the Licensee a notice reducing the Licence Period by a specified
          period not exceeding two years.

     (b)  Where the Licence is due to expire on a particular date by virtue of a
          notice served on the Licensee under Condition 22(2)(a), the Commission
          may, on the application of the Licensee by a further notice served on
          him at any time before that date, revoke that notice if it is
          satisfied that such revocation is justified by virtue of the conduct
          of the Licensee in relation to the operations of the Licensed Service
          since the date of the earlier notice. 
<PAGE>
 
                                       22

23.  REVOCATION

(1)  (a)  If the Commission is satisfied that the Licensee is failing to comply
          with any Condition of the Licence or with any direction given by the
          Commission such that, if that failure were not remedied, it would
          justify the revocation of the Licence, the Commission shall serve on
          the Licensee a notice.

          (i)    stating that the Commission is so satisfied.

          (ii)   specifying the respects in which, in the opinion of the
                 Commission, the Licensee is failing to comply with any such
                 Condition or direction; and

          (iii)  stating that, unless the Licensee takes, within such period as
                 is specified in the notice, such steps to remedy the failure as
                 are so specified, the Commission will revoke the Licence.

     (b)  If at the end of the period specified in any notice under Condition
          23(1)(a) the Commission is satisfied that the Licensee has failed to
          take the steps specified in the notice and that it is necessary in the
          public interest to revoke the Licence, the Commission shall serve on
          the License a notice revoking the Licence.

(2)  The Commission shall revoke the Licence by notice in writing served on the
     Licensee and taking effect as from the time of service in

     (a)  the Licensee indicates to the Commission before the Commencement Date
          that he does not intend to provide the Licensed Service; or

     (b)  the Commission for any other reason has reasonable grounds for
          believing that the Licensee will not provide the Licensed Service
          after the Commencement Date and it has served on the Licensee a notice
          stating its grounds for believing that he will not provide that
          service after that date.

(3)  The Commission may revoke the Licence by notice served on the Licensee and
     taking effect either forthwith or on a date specified in the notice, in any
     of the following circumstances:

     (a)  if the Licensee ceases to provide the Licensed Service before the end
          of the Licence Period and the Commission are satisfied that it is
          appropriate to revoke the Licence;

     (b)  if the Licensee agrees in writing with the Commission that the Licence
          should be revoked;

     (c)  if the Licensee becomes a disqualified person in relation to the
          Licence by virtue of Part II of Schedule 2 to the 1990 Act or
          otherwise fails to comply with any requirement imposed on or in
          relation to the holders of multiplex licences by or under that
          Schedule:
<PAGE>
 
                                       23

     (d)  if the Commission is satisfied that the Licensee:

          (i)  in purporting to comply with any of the Conditions of the Licence
               has provided information which is false in a material particular
               or has withheld any material information with the intention of
               causing the Commission to be misled; or

          (ii) in connection with his application for the Licence, provided the
               Commission with information which was false in a material
               particular or withheld any material information with the
               intention of causing the Commission to be misled;

     (e)  if, where the Licensee is a body, a change affecting the nature or
          characteristics of the Licensee or any change in the persons having
          control over or interests in the Licensee, or any other change giving
          rise to a failure to comply with any requirement imposed by or under
          Section 2 to the 1990 Act takes place (whether before or after the
          Commencement Date), which change is such that, if it fell to the
          Commission to determine whether to award the Licence to the Licensee
          in the new circumstances of the case, it would be induced by the
          change to refrain form awarding the Licence to the Licensee;

     (f)  without prejudice to the generality of Condition 23(3)(e), if, without
          the prior written consent of the Commission:

          (i)  BSkyB, BSkyB Limited or BSB Holdings or any person connected with
               BSkyB, BSkyB Limited or BSB Holdings shall directly or indirectly
               have any interest in the shares or possess any voting power or
               have any other financial interest in the Licensee or any person
               controlling the Licensee; or

          (ii) any person having directly or indirectly a material financial
               interest in BSkyB, BSkyB Limited or BSB Holdings shall control
               the Licensee;

     (g)  if the Commission ceases to be satisfied that the Licensee is a fit
          and proper person to hold the Licence;

     (h)  if the Licensee fails to comply with any requirement to hold a Licence
          under Section 1 of the Wireless Telegraph Act 1949 (as amended) and/or
          Section 7 of the Telecommunications Act 1984;

     (i)  if the Secretary of State shall, pursuant to Section 6(3) of the 1996
          Act revoke the assignment of the Frequencies.

(4)  For the purpose of Condition 23(3)(f):

          (a)  a "MATERIAL FINANCIAL INTEREST" in a body corporate means an
               interest of five per cent or more of the shares or possession of
               five per cent, or more of the voting power in the body corporate;
               and

          (b)  a "FINANCIAL INTEREST" shall not include any payment for services
               provided under and agreement for the supply or (digital or
               analogue) programme services or additional services.
<PAGE>
 
                                       24

(5)  The Commission shall before serving a notice revoking the Licence or a
     notice under Condition 23(2)(b) notify the Licensee of the matters
     complained of and give the Licensee a reasonable opportunity to make
     representations to it about the matters complained of.

(6)  (a)  Where the Licence is revoked pursuant to any provision of Part I of
          the 1996 Act, or is treated as being revoked under Section 145 of the
          1996 Act, the Licensee shall with such period as the Commission shall
          notify to him, pay to the Commission a specified financial penalty not
          exceeding whichever is the greater of (Pounds)50,000 (or such other
          sum as the Secretary of State may by order specify under Section 36 of
          the 1996 Act) or the Prescribed Amount:

     (b)  The Licensee's liability to pay such penalty shall not be affected by
          the Licence ceasing (for any reason) to be in force.

(7)  If the Licensee is convicted of an offence under Section 144 of the 1996
     Act and the court by which the Licensee is convicted makes an order
     disqualifying him from holding a licence during a period specified in the
     order, or if the Licensee is disqualified from holding a licence, pursuant
     to Section 145(3) of the 1996 Act, in consequence of an order disqualifying
     an individual from holding a licence, this Licence shall be treated as
     being revoked with effect from the time when the order takes effect.
<PAGE>
 
                                       25

                                     ANNEX

                             THE LICENSED SERVICE

DEFINITIONS AND INTERPRETATION

In these Conditions, unless the context otherwise requires it:

(a)  "CORE PROPOSALS" means the supplementary proposals submitted by the
      --------------                                                    
     Licensee in his application for the Licence in response to Questions A.1 to
     A.7 inclusive in Part I of Section A and Financial Questions B.1 to B.17
     inclusive in Section B of the Attachment to Part III of the Invitation to
     Apply, together with any additional information furnished to the Commission
     by the Licensee pursuant to Section 7(6) of the 1996 Act in relation to the
     proposed service details of which are set out in Part VI of this Annex;
     Terms used in such Core Proposals shall be interpreted in accordance with
     the guidance provided by the Commission in the Invitation to Apply;

     "INVITATION TO APPLY" means the Invitation to Apply for multiplex service
     licences issued by the Commission on 31st October, 1996;

     references to a "LETTER", followed by a date, means the letter of that
     date, details of which are set out in Part VI of this Annex;

     references to a "FINANCIAL QUESTION", followed by a number, means the
     question of that number in Section B of the Attachment to Part III of the
     Invitation to Apply;

     references to a "QUESTION", followed by a number, means the question of
     that number in Part 1 of Section A of the Attachment to Part III of the
     Invitation to Apply.

(b)  In the event of any inconsistency between the Core Proposals and the
     Conditions set out in this Annex, the latter shall prevail.
<PAGE>
 
                                       26

MISSING
<PAGE>
 
                                       27

MISSING
<PAGE>
 
                                       28

                                    PART II

              CONDITIONS RELATING TO DIGITAL ADDITIONAL SERVICES


The Licensee shall implement the Core Proposals in response to Question A.7.
<PAGE>
 
                                       29

                                   PART III

  CONDITIONS RELATING TO PROMOTING OR ASSISTING THE ACQUISITION OF EQUIPMENT

1.   The Licensee shall implement the Core Proposals in response to Question 1.3
     and Financial Question B.2(ii) (first three bullet points) and Financial
     Question B.3. These Core Proposals include, without limitation, Section B2
     (paragraphs 155 to 158 (inclusive) and 171) and Section B3 of the
     Licensee's Core Proposals.

2.   Without prejudice to the generality of paragraph 1, the License shall make
     the expenditures set out in the Appendix to this Annex (which is and shall
     be confidential) (the "CONFIDENTIAL APPENDIX") (as varied by the Commission
     in writing from time to time) in accordance with the Core Proposals. For
     the purposes of this Licence, the Confidential Appendix shall be treated as
     though it were set out in and formed part of this Part of the Annex.
<PAGE>
 
                                       30

                                    PART IV

                   CONDITIONS RELATING TO THE TECHNICAL PLAN

The Licensee shall implement the Core Proposals in response to Question A.2 and
the Letter of 22nd April, 1997 in accordance with the timetable set out below:

PHASE I   BROADCASTING STATIONS FROM WHICH THE LICENSED SERVICE MUST BE
          BROADCAST FROM THE COMMENCEMENT DATE

          [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.
<PAGE>
 
                                       31

PHASE 2   BROADCASTING STATIONS FROM WHICH THE LICENSED SERVICE MUST HAVE
          COMMENCED BROADCASTING BY THE DATE EIGHT MONTHS AFTER THE COMMENCEMENT
          DATE

          [*]


PHASE 3   BROADCASTING STATIONS FROM WHICH THE LICENSED SERVICE MUST HAVE
          COMMENCED BROADCASTING BY THE DATE SIXTEEN MONTHS AFTER THE
          COMMENCEMENT DATE

          [*]

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

<PAGE>
 
                                       32

          [*]

This timetable is subject to the necessary national and international clearances
for broadcasting from the stations in question being obtained in due time.  If
the Licensee provides evidence satisfactory to the Commission that delays in
obtaining the necessary clearances make it impracticable for the Licensee to
comply with the above timetable in respect of any station, the Licensee shall
commence broadcasting from that station as soon as reasonably practicable after
the clearances have been obtained.

[*]  indicates where text has been omitted pursuant to a request for
     confidential treatment. The omitted text has been filed with the Securities
     and Exchange Commission separately.

<PAGE>
 
                                       33

                                    PART V

                       DETAILS OF BROADCASTING STATIONS

                               MULTIPLEX [B,C,D]

                                    PART V
                DETAILS OF BROADCASTING STATIONS - MULTIPLEX B

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
Station Name             Grid Reference  UHF Channel  Aerial Height
- --------------------------------------------------------------------------------
<S>                      <C>             <C>          <C>
Aberdare                 SO034013            26            333
- --------------------------------------------------------------------------------
Angus                    NO394407            62            549
- --------------------------------------------------------------------------------
Beacon Hill              SX857619            54            249
- --------------------------------------------------------------------------------
Belmont                  TF218836            66            347
- --------------------------------------------------------------------------------
Bilsdale                 SE553962            24            690
- --------------------------------------------------------------------------------
Black Hill               NS828647            51            539
- --------------------------------------------------------------------------------
Blaenplwyf               SN569757            32            325
- --------------------------------------------------------------------------------
Bluebell Hill            TQ757613            45            236
- --------------------------------------------------------------------------------
Bressay                  HU503387            31            299
- --------------------------------------------------------------------------------
Brierley Hill            SO916856            59            180
- --------------------------------------------------------------------------------
Bristol King's Weston    ST547775            32            144
- --------------------------------------------------------------------------------
Bromsgrove               SO948730            23            199
- --------------------------------------------------------------------------------
Brougher Mountain        IH350527            26            370
- --------------------------------------------------------------------------------
Caldbeck                 NY299425            39            578
- --------------------------------------------------------------------------------
Caradon Hill             SX273707            21            592
- --------------------------------------------------------------------------------
Carmel                   SN576153            62            412
- --------------------------------------------------------------------------------
Chatton                  NU105264            46            348
- --------------------------------------------------------------------------------
Chesterfield             SK382764            46            231
- --------------------------------------------------------------------------------
Craigkelly               NT233872            26            315
- --------------------------------------------------------------------------------
Crystal Palace           TQ339712            28            321
- --------------------------------------------------------------------------------
Darvel                   NS557341            28            395
- --------------------------------------------------------------------------------
Divis                    IJ287750            26            505
- --------------------------------------------------------------------------------
Dover                    TR274397            58            328
- --------------------------------------------------------------------------------
Durris                   NO763899            51            608
- --------------------------------------------------------------------------------
Eitshal                  NB305303            25            366
- --------------------------------------------------------------------------------
Emley Moor               SE222128            46            565
- --------------------------------------------------------------------------------
Fenham                   NZ216648            28            170
- --------------------------------------------------------------------------------
Fenton                   SJ903451            25            241
- --------------------------------------------------------------------------------
Fremont Point            XD908280            32            247
- --------------------------------------------------------------------------------
Guildford                SU975486            51          172.5
- --------------------------------------------------------------------------------
Hannington               SU527568            46            352
- --------------------------------------------------------------------------------
Hastings                 TQ806100            24            126
- --------------------------------------------------------------------------------
Heathfield               TQ566220            47          258.5
- --------------------------------------------------------------------------------
Hemel Hempstead          TL088045            66            212
- --------------------------------------------------------------------------------
Huntshaw Cross           SS527220            64            349
- --------------------------------------------------------------------------------
Idle                     SE163374            56            265
- --------------------------------------------------------------------------------
</TABLE> 
<PAGE>
 
                                       34

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------
Station Name             Grid Reference  UHF Channel  Aerial Height     
- ------------------------------------------------------------------------
<S>                      <C>             <C>          <C>               
Ilchester Crescent          ST577700         44            99           
- ------------------------------------------------------------------------
Keelylang Hill              HY378102         44           270           
- ------------------------------------------------------------------------
Keighley                    SE069444         34           354           
- ------------------------------------------------------------------------
Kilvey Hill                 SS672940         32           232           
- ------------------------------------------------------------------------
Knock More                  NJ321497         57           418           
- ------------------------------------------------------------------------
Lancaster                   SD490662         32           184           
- ------------------------------------------------------------------------
Lark Stoke                  SP187426         27           277           
- ------------------------------------------------------------------------
Limavady                    IC711296         57           393           
- ------------------------------------------------------------------------
Llanddona                   SH583810         61           258           
- ------------------------------------------------------------------------
Malvern                     SO774464         55           207           
- ------------------------------------------------------------------------
Mendip                      ST564488         65           572           
- ------------------------------------------------------------------------
Midhurst                    SU912250         59           294           
- ------------------------------------------------------------------------
Moel-y-Parc                 SJ123701         64           552           
- ------------------------------------------------------------------------
Nottingham                  SK503435         63           178           
- ------------------------------------------------------------------------
Oliver's Mount              TA040869         58           188           
- ------------------------------------------------------------------------
Oxford                      SP567105         52           277           
- ------------------------------------------------------------------------
Pendle Forest               SD825384         31           326           
- ------------------------------------------------------------------------
Plympton                    SX531555         60           164           
- ------------------------------------------------------------------------
Pontop Pike                 NZ148526         62           450           
- ------------------------------------------------------------------------
Pontypool                   ST284990         45           295           
- ------------------------------------------------------------------------
Presely                     SN172306         42           529           
- ------------------------------------------------------------------------
Redruth                     SW690395         49           370           
- ------------------------------------------------------------------------
Reigate                     TQ257521         27           291           
- ------------------------------------------------------------------------
Ridge Hill                  SO630333         39           333           
- ------------------------------------------------------------------------
Rosemarkie                  NH762623         44           323           
- ------------------------------------------------------------------------
Rosneath                    NS258811         60           218           
- ------------------------------------------------------------------------
Rowridge                    SZ447865         32           257           
- ------------------------------------------------------------------------
Rumster Forest              ND197385         32           455           
- ------------------------------------------------------------------------
Saddleworth                 SD987050         51           398           
- ------------------------------------------------------------------------
Salisbury                   SU136285         62           156           
- ------------------------------------------------------------------------
Sandy Heath                 TL204494         67           197           
- ------------------------------------------------------------------------
Selkirk                     NT500294         63           518           
- ------------------------------------------------------------------------
Sheffield                   SK324870         60           278           
- ------------------------------------------------------------------------
Stockland Hill              ST222014         32           419           
- ------------------------------------------------------------------------
Storeton                    SJ314841         26           110           
- ------------------------------------------------------------------------
Sudbury                     TL913377         39           160           
- ------------------------------------------------------------------------
Sutton Coldfield            SK113003         51           395           
- ------------------------------------------------------------------------
Tacolneston                 TM131958         57           215           
- ------------------------------------------------------------------------
The Wrekin                  SJ628082         27           436           
- ------------------------------------------------------------------------
The Wrekin B                SJ628082         45           436           
- ------------------------------------------------------------------------
Torosay                     NM703358         33           478           
- ------------------------------------------------------------------------
Tunbridge Wells             TQ607440         45           172           
- ------------------------------------------------------------------------
Waltham                     SK809233         33           418           
- ------------------------------------------------------------------------
Wenvoe                      ST110742         67           311           
- ------------------------------------------------------------------------
Whitehawk Hill              TQ330045         48           172           
- ------------------------------------------------------------------------
Winter Hill                 SD660144         50           682           
- ------------------------------------------------------------------------
</TABLE>
<PAGE>
 
                                       35

All necessary national and international clearances for broadcasting from these
stations have not been obtained at the Date of Grant.  The details given above
may be subject to change and the Licensee's use of each station in connection
with the Licensed Service is subject to such clearances being obtained for that
station.

Note:  Aerial heights given in metres above Ordnance Datum.
<PAGE>
 
                                    PART V

                DETAILS OF BROADCASTING STATIONS - MULTIPLEX C

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
Station Name             Grid Reference  UHF Channel  Aerial Height
- --------------------------------------------------------------------------------
<S>                      <C>             <C>          <C>
Aberdare                 SO034013            29                 333
- --------------------------------------------------------------------------------
Angus                    NO394407            56                 549
- --------------------------------------------------------------------------------
Beacon Hill              SX857619            56                 249
- --------------------------------------------------------------------------------
Belmont                  TF218836            60                 314
- --------------------------------------------------------------------------------
Bilsdale                 SE553962            27                 690
- --------------------------------------------------------------------------------
Black Hill               NS828647            55                 539
- --------------------------------------------------------------------------------
Blaenplwyf               SN569757            29                 325
- --------------------------------------------------------------------------------
Bluebell Hill            TQ757613            42                 236
- --------------------------------------------------------------------------------
Bressay                  HU503387            66                 291
- --------------------------------------------------------------------------------
Brierley Hill            SO916856            66                 180
- --------------------------------------------------------------------------------
Bristol King's Weston    ST547775            30                 144
- --------------------------------------------------------------------------------
Bromsgrove               SO948730            26                 199
- --------------------------------------------------------------------------------
Brougher Mountain        IH350527            29                 370
- --------------------------------------------------------------------------------
Caldbeck                 NY299425            45                 578
- --------------------------------------------------------------------------------
Caradon Hill             SX273707            24                 592
- --------------------------------------------------------------------------------
Carmel                   SN576153            68                 398
- --------------------------------------------------------------------------------
Chatton                  NU105264            47                 348
- --------------------------------------------------------------------------------
Chesterfield             SK382764            50                 231
- --------------------------------------------------------------------------------
Craigkelly               NT233872            42                 315
- --------------------------------------------------------------------------------
Crystal Palace           TQ339712            34                 321
- --------------------------------------------------------------------------------
Darvel                   NS557341            30                 395
- --------------------------------------------------------------------------------
Divis                    IJ287750            48                 497
- --------------------------------------------------------------------------------
Dover                    TR274397            57                 328
- --------------------------------------------------------------------------------
Durris                   NO763899            41                 608
- --------------------------------------------------------------------------------
Eitshal                  NB305303            28                 366
- --------------------------------------------------------------------------------
Emley Moor               SE222128            50                 565
- --------------------------------------------------------------------------------
Fenham                   NZ216648            32                 170
- --------------------------------------------------------------------------------
Fenton                   SJ903451            28                 241
- --------------------------------------------------------------------------------
Fremont Point            XD908280            66                 227
- --------------------------------------------------------------------------------
Guildford                SU975486            47               172.5
- --------------------------------------------------------------------------------
Hannington               SU527568            29                 352
- --------------------------------------------------------------------------------
Hastings                 TQ806100            63                 126
- --------------------------------------------------------------------------------
Heathfield               TQ566220            54                 281
- --------------------------------------------------------------------------------
Hemel Hempstead          TL088045            50                 212
- --------------------------------------------------------------------------------
Huntshaw Cross           SS527220            53                 338
- --------------------------------------------------------------------------------
Huntshaw Cross B         SS527220            51                 338
- --------------------------------------------------------------------------------
Idle                     SE163374            30                 265
- --------------------------------------------------------------------------------
Ilchester Crescent       ST577700            47                  99
- --------------------------------------------------------------------------------
Keelylang Hill           HY378102            47                 270
- --------------------------------------------------------------------------------
Kilvey Hill              SS672940            21                 232
- --------------------------------------------------------------------------------
Knock More               NJ321497            60                 418
- --------------------------------------------------------------------------------
</TABLE> 
<PAGE>
 
                                       37

<TABLE>
<CAPTION>
     -------------------------------------------------------------------
      Station Name        Grid Reference  UHF Channel  Aerial Height
     <S>                  <C>             <C>          <C> 
     -------------------------------------------------------------------
      Lancaster                 SD490662      32            184
     -------------------------------------------------------------------
      Lark Stoke                SP187426      27            277
     -------------------------------------------------------------------
      Limavady                  IC711296      57            393
     -------------------------------------------------------------------
      Llanddona                 SH583810      61            258
     -------------------------------------------------------------------
      Malvern                   SO774464      55            207
     -------------------------------------------------------------------
      Mendip                    ST564488      65            572
     -------------------------------------------------------------------
      Midhurst                  SU912250      59            294
     -------------------------------------------------------------------
      Moel-y-Parc               SJ123701      64            552
     -------------------------------------------------------------------
      Nottingham                SK503435      63            178
     -------------------------------------------------------------------
      Oliver's Mount            TA040869      58            188
     -------------------------------------------------------------------
      Oxford                    SP567105      52            277
     -------------------------------------------------------------------
      Pendle Forest             SD825384      31            326
     -------------------------------------------------------------------
      Plympton                  SX531555      60            164
     -------------------------------------------------------------------
      Pontop Pike               NZ148526      62            450
     -------------------------------------------------------------------
      Pontypool                 ST284990      45            295
     -------------------------------------------------------------------
      Presely                   SN172306      42            529
     -------------------------------------------------------------------
      Redruth                   SW690395      49            370
     -------------------------------------------------------------------
      Reigate                   TQ257521      27            291
     -------------------------------------------------------------------
      Ridge Hill                SO630333      39            333
     -------------------------------------------------------------------
      Rosemarkie                NH762623      44            323
     -------------------------------------------------------------------
      Rosneath                  NS258811      60            218
     -------------------------------------------------------------------
      Rowridge                  SZ447865      32            257
     -------------------------------------------------------------------
      Rumster Forest            ND197385      32            455
     -------------------------------------------------------------------
      Saddleworth               SD987050      51            398
     -------------------------------------------------------------------
      Salisbury                 SU136285      62            156
     -------------------------------------------------------------------
      Sandy Heath               TL204494      67            197
     -------------------------------------------------------------------
      Selkirk                   NT500294      63            518
     -------------------------------------------------------------------
      Sheffield                 SK324870      60            278
     -------------------------------------------------------------------
      Stockland Hill            ST222014      32            419
     -------------------------------------------------------------------
      Storeton                  SJ314841      26            110
     -------------------------------------------------------------------
      Sudbury                   TL913377      39            160
     -------------------------------------------------------------------
      Sutton Coldfield          SK113003      51            395
     -------------------------------------------------------------------
      Tacolneston               TM131958      57            215
     -------------------------------------------------------------------
      The Wrekin                SJ628082      27            436
     -------------------------------------------------------------------
      The Wrekin B              SJ628082      45            436
     -------------------------------------------------------------------
      Torosay                   NM703358      33            478
     -------------------------------------------------------------------
      Tunbridge Wells           TQ607440      45            172
     -------------------------------------------------------------------
      Waltham                   SK809233      33            418
     -------------------------------------------------------------------
      Wenvoe                    ST110742      67            311
     -------------------------------------------------------------------
      Whitehawk Hill            TQ330045      48            172
     -------------------------------------------------------------------
      Winter Hill               SD660144      50            682
     ------------------------------------------------------------------- 
</TABLE>

All necessary national and international clearances for broadcasting from these
stations have not been obtained at the Date of Grant.  The details given above
may be subject to change and the Licensee's use of each station in connection
with the Licensed Service is subject to such clearances being obtained for that
station.

Note:  Aerial heights given in metres above Ordnance Datum.
<PAGE>
 
                                       38

                                     PART V
                 DETAILS OF BROADCASTING STATIONS - MULTIPLEX D

<TABLE>
<CAPTION>
     -------------------------------------------------------------------
      Station Name        Grid Reference  UHF Channel  Aerial Height
      <S>                 <C>             <C>          <C> 
     -------------------------------------------------------------------  
     -------------------------------------------------------------------  
      Aberdare                 SO034013       33            333
     -------------------------------------------------------------------
      Angus                    NO394407       65            549
     -------------------------------------------------------------------
      Beacon Hill              SX857619       64            249
     -------------------------------------------------------------------
      Belmont                  TF218836       57            314
     -------------------------------------------------------------------
      Bilsdale                 SE553962       42            687
     -------------------------------------------------------------------
      Black Hill               NS828647       65            573
     -------------------------------------------------------------------
      Blaenplwyf               SN569757       33            325
     -------------------------------------------------------------------
      Bluebell Hill            TQ757613       39            236
     -------------------------------------------------------------------
      Bressay                  HU503387       68            291
     -------------------------------------------------------------------
      Brierley Hill            SO916856       62            180
     -------------------------------------------------------------------
      Bristol King's Weston    ST547775       34            144
     -------------------------------------------------------------------
      Bromsgrove               SO948730       30            199
     -------------------------------------------------------------------
      Brougher Mountain        IH350527       33            370
     -------------------------------------------------------------------
      Caldbeck                 NY299425       42            578
     -------------------------------------------------------------------
      Caradon Hill             SX273707       27            592
     -------------------------------------------------------------------
      Carmel                   SN576153       64            398
     -------------------------------------------------------------------
      Chatton                  NU105264       51            348
     -------------------------------------------------------------------
      Chesterfield             SK382764       52            231
     -------------------------------------------------------------------
      Craigkelly               NT233872       39            315
     -------------------------------------------------------------------
      Crystal Palace           TQ339712       29            321
     -------------------------------------------------------------------
      Darvel                   NS557341       34            395
     -------------------------------------------------------------------
      Divis                    IJ287750       34            497
     -------------------------------------------------------------------
      Dover                    TR274397       60            328
     -------------------------------------------------------------------
      Durris                   NO763899       44            608
     -------------------------------------------------------------------
      Eitshal                  NB305303       32            366
     -------------------------------------------------------------------
      Emley Moor               SE222128       49            565
     -------------------------------------------------------------------
      Fenham                   NZ216648       57            159
     -------------------------------------------------------------------
      Fenton                   SJ903451       32            241
     -------------------------------------------------------------------
      Fremont Point            XD908280       68            227
     -------------------------------------------------------------------
      Guildford                SU975486       54            169
     -------------------------------------------------------------------
      Hannington               SU527568       48            352
     -------------------------------------------------------------------
      Hastings                 TQ806100       60            126
     -------------------------------------------------------------------
      Heathfield               TQ566220       51          258.5
     -------------------------------------------------------------------
      Hemel Hempstead          TL088045       43            212
     -------------------------------------------------------------------
      Huntshaw Cross           SS527220       57            338
     -------------------------------------------------------------------
      Huntshaw Cross B         SS527220       47            338
     -------------------------------------------------------------------
      Idle                     SE163374       42            265
     -------------------------------------------------------------------
      Ilchester Crescent       ST577700       51             99
     -------------------------------------------------------------------
      Keelylang Hill           HY378102       51            270
     -------------------------------------------------------------------
      Kilvey Hill              SS672940       31            232
     -------------------------------------------------------------------
      Knock More               NJ321497       56            418
     -------------------------------------------------------------------
      Lancaster                SD490662       30            184
     -------------------------------------------------------------------
</TABLE> 
<PAGE>
 
                                       39

<TABLE>
<CAPTION>
     -------------------------------------------------------------------
      Station Name        Grid Reference  UHF Channel  Aerial Height
      <S>                 <C>             <C>          <C> 
     ------------------------------------------------------------------- 
      Lark Stoke               SP187426       60            277
     -------------------------------------------------------------------
      Limavady                 IC711296       63            393
     -------------------------------------------------------------------
      Llanddona                SH583810       46            258
     -------------------------------------------------------------------
      Malvern                  SO774464       26            202
     -------------------------------------------------------------------
      Mendip                   ST564488       48          574.5
     -------------------------------------------------------------------
      Midhurst                 SU912250       60            294
     -------------------------------------------------------------------
      Moel-y-Parc              SJ123701       34            549
     -------------------------------------------------------------------
      Nottingham               SK503435       59            178
     -------------------------------------------------------------------
      Oliver's Mount           TA040869       64            188
     -------------------------------------------------------------------
      Oxford                   SP567105       67            289
     -------------------------------------------------------------------
      Pendle Forest            SD825384       34            326
     -------------------------------------------------------------------
      Plympton                 SX531555       56            164
     -------------------------------------------------------------------
      Pontop Pike              NZ148526       53            450
     -------------------------------------------------------------------
      Pontypool                ST284990       68            295
     -------------------------------------------------------------------
      Presely                  SN172306       49            529
     -------------------------------------------------------------------
      Redruth                  SW690395       50            387
     -------------------------------------------------------------------
      Ridge Hill               SO630333       45            333
     -------------------------------------------------------------------
      Rosemarkie               NH762623       50            323
     -------------------------------------------------------------------
      Rosneath                 NS258811       48            218
     -------------------------------------------------------------------
      Rowridge                 SZ447865       28            257
     -------------------------------------------------------------------
      Rumster Forest           ND197385       59            411
     -------------------------------------------------------------------
      Saddleworth              SD987050       54            398
     -------------------------------------------------------------------
      Salisbury                SU136285       52            156
     -------------------------------------------------------------------
      Sandy Heath              TL204494       46            267
     -------------------------------------------------------------------
      Selkirk                  NT500294       56            518
     -------------------------------------------------------------------
      Sheffield                SK324870       42            278
     -------------------------------------------------------------------
      Stockland Hill           ST222014       34            419
     -------------------------------------------------------------------
      Storeton                 SJ314841       33            110
     -------------------------------------------------------------------
      Sudbury                  TL913377       50            182
     -------------------------------------------------------------------
      Sutton Coldfield         SK113003       55            395
     -------------------------------------------------------------------
      Tacolneston              TM131958       46            184
     -------------------------------------------------------------------
      The Wrekin               SJ628082       57            434
     -------------------------------------------------------------------
      Torosay                  NM703358       31            478
     -------------------------------------------------------------------
      Tunbridge Wells          TQ607440       59            172
     -------------------------------------------------------------------
      Waltham                  SK809233       42            418
     -------------------------------------------------------------------
      Whitehawk Hill           TQ330045       61            172
     -------------------------------------------------------------------
      Winter Hill              SD660144       63            650
     -------------------------------------------------------------------
      Winter Hill 3            SD660144       40            555
     ------------------------------------------------------------------- 
</TABLE>

All necessary national and international clearances for broadcasting from these
stations have not been obtained at the Date of Grant.  The details given above
may be subject to change and the Licensee's use of each station in connection
with the Licensed Service is subject to such clearances being obtained for that
station.

Note:  Aerial heights given in metres above Ordnance Datum.
<PAGE>
 
                                       40

                                    PART VI

                            ADDITIONAL INFORMATION

1.   Letter of 20th March, 1997 and attached memorandum and schedules from the
     Licensee to the Commission in reply to a letter of 12th March, 1997 from
     the Commission to the Licensee.

2.   Letter of 17th April, 1997 from the Licensee to the Commission in reply to
     a letter of 10th April, 1997 from the Commission to the Licensee.

3.   Letter of 22nd April, 1997 and attached note and diagram from the Licensee
     to the Commission in reply to a letter of 15th April, 1997 from the
     Commission to the Licensee.

4.   Letter of 28th April, 1997 from the Licensee to the Commission in reply to
     a letter of 21st April, 1997 from the Commission to the Licensee.

<PAGE>
 
                                                                   EXHIBIT 10.37



                               CONTRACT BETWEEN

                        BRITISH TELECOMMUNICATIONS PLC

                                      AND

                  CASTLE TRANSMISSION INTERNATIONAL  LIMITED

                             FOR THE PROVISION OF
                        DIGITAL TERRESTRIAL TELEVISION
                         NETWORK DISTRIBUTION SERVICE
<PAGE>
 
                                                                               1


INDEX
- -----

1.   Interpretation
2.   Provision of the Service
3.   Acceptance Tests
4.   BT Equipment and Site Requirements, and Customer's Content Signals
     Responsibilities
5.   Connection of Equipment to the Service
6.   Access and Site Regulations
7.   Use of the Service
8.   Intellectual Property Rights
9.   Intellectual Property Right Indemnities
10.  Confidentiality
11.  Charges and Deposits
12.  Limitation of Liability
13.  Matters Beyond Either Party's Reasonable Control
14.  Escalation and Dispute Resolution
15.  Termination of this Contract by Notice
16.  Breaches of this Contract
17.  Changes to this Contract
18.  Insurance
19.  Assignment
20.  Entire Agreement
21.  Notices

SCHEDULES

1.   Description of the Service
2.   Charges for the Service
3.   Late Delivery Payments and Abatements
4.   Functional Design Specification
5.   Implementation Plan
6.   Acceptance Tests
7.   Network Management Service
8.   Specifications of Customer's Content Signals
9.   Persons permitted to receive confidential information
10.  Contract Change Order Form
<PAGE>
 
                                                                               2

THIS CONTRACT is made 19 May 1998
BETWEEN
BRITISH TELECOMMUNICATIONS PLC whose registered office is at 81 Newgate Street,
London EC1A 7AJ, registered in England No. 1800000 ("BT").
AND
CASTLE TRANSMISSION INTERNATIONAL LIMITED whose registered office is at Warwick
Technology Park, Gallows Hill, Heathcote Lane, Warwick CV34 6TN,  registered in
England No. 3196207  ("the Customer")

INTRODUCTION

1.        The Customer has requested BT to provide a Digital Terrestrial
          Television Network Distribution Service ("DTTV Service").

2.        BT and the Customer have agreed the DTTV Service will be provided on
          the terms and conditions of this Contract.

IT IS AGREED AS FOLLOWS:

1.   INTERPRETATION

1.1  In this Contract the following words and phrases have the following
     meanings:

     GENERAL DEFINITIONS :

     "Abatements"             means the payments described in Part 3 of Schedule
                              3.
 
     "Acceptance Criteria"    means the acceptance criteria described in Part
                              2 of Schedule 6
 
     "Acceptance Tests"       means the acceptance tests described in Part 1
                              of Schedule 6.
<PAGE>
 
                                                                               3

     "ASI"                    means Asynchronous Serial Interface, a DVB
                              transport stream specification.
 
     "ASI mux" or "ASI        means a BT proprietory interface device which
      multiplex"              combines or separates a number of individual
                              transport streams for carriage over the DTTV
                              Distribution Network.
 
     "Broadcasting            means the Independent Television Commission
      Authority"              as defined in the Broadcasting Acts 1990 and
                              1996, or, in the case of the BBC the
                              government department and/or governing body
                              having jurisdiction over the BBC's broadcasting
                              activities under any Charter establishing the
                              BBC or any amendment thereto.
 
     "BT Equipment"           means equipment (including software) placed
                              on a Site by BT for the provision of the Service.
 
     "BT's Licence"           means the Licence granted to BT under Section
                              7 of the Telecommunications Act 1984.
 
     "BT's Licensed Area      means the United Kingdom other than the area
      in the United           in which Kingston Communications (Hull) plc is
      Kingdom"                licensed to run telecommunication systems
                              under its licence granted to it under Section 7 of
                              the Telecommunications Act 1984
 
     "Charges"                means the charges payable by the Customer for
                              the Service in accordance with Clause 11 and
                              Schedule 2.
 
     "CNAP"                   means a Core Network Access Point, being a
                              primary point at which access and/or egress
<PAGE>
 
                                                                               4


                              can be provided to the DTTV Distribution
                              Network.

     "Connection Point"       means a block terminal, a socket for a
                              removable plug, a distribution frame, or any
                              other device supplied and installed by BT at
                              Playout Centres  and/or at Transmitter Sites.
 
     "Customer's Content      means video, audio and data signals of the
      Signals"                Customer, or of any third party the Customer
                              allows to use the Service,  having the technical
                              characteristics and specifications described in
                              Schedule 8.
 
     "Customer                means equipment directly connected to the
      Equipment"              DTTV Distribution Network used by the
                              Customer, or by any third party the Customer
                              allows to use the Service.
 
     "Day"                    means, for the purposes of Schedule 3, Day as
                              described in Part 1 of Schedule 3.
 
     "Digital Network         means the industry body of that name established
      Group"                  to facilitate the introduction of digital
                              television in the United Kingdom.

     "Distribution Input      means an interface (physical, electrical and data)
      Interface"              at which the Customer or its agent delivers the
                              Customer's Contents Signals to BT for distribution
                              across the DTTV Distribution Network, having the
                              characteristics described in Part 1 of Schedule 1.
 
     "Distribution Output     means an interface (physical, electrical and data)
      Interface"              at which BT delivers the Customer's
<PAGE>
 
                                                                               5

                              Contents Signals back to the Customer or its
                              agent after completing its passage through the
                              DTTV Distribution Network, having the
                              characteristics described in Part 1 of Schedule 1.
 
     "DTTV Distribution       means the network to be established by BT for
      Network"                providing the Service.

     "DTTV Multiplex          means a multiplex service as defined in the
      Service"                Broadcasting Act 1996.
 
     "DVB"                    means the standards developed by the Digital
                              Video Broadcasting Project.
 
     "Emergency"              means an emergency of any kind including any
                              circumstance whatever resulting from major
                              accidents, natural disasters and incidents
                              involving toxic or radio-active materials.
 
     "Emergency               means in respect of any locality :-
      Organisations"          (i)  the relevant public police, fire, ambulance
                              and coastguard services for that locality; and
                              (ii) any other similar organisation providing
                              assistance to the public in Emergencies in respect
                              of which BT provides a public emergency call
                              service.
 
     "Full Testing            means the Full Testing Service as described in
      Service"                Part 1 of Schedule 1.
 
     "Functional Design       means the document describing the technical
      Specification"          characteristics and specifications relating to the
                              Service as described in Schedule 4.
<PAGE>
 
                                                                               6

     "Group Company"          means a subsidiary or holding company of BT or
                              of the Customer (as appropriate), or a subsidiary
                              of that holding company, all as defined by Section
                              736 of the Companies Act 1985.
 
     "Implementation          means the BT implementation plan for delivery
      Plan"                   and testing of the Service as described in
                              Schedule 5.
 
     "Late Delivery           means the payments described in Part 1 of
      Payments"               Schedule 3.
 
     "Loss of Service"        means Loss of Service as defined in Part 2 of
                              Schedule 3.
 
     Minimum Period           means the period from signature of this Contract
                              to the expiry of the 12th anniversary of 31
                              October 1998 or such later date as may be
                              substituted pursuant to the provisions of Sub-
                              clause 17.2.1, and as such period may be
                              extended by the Customer pursuant to the
                              provisions of Sub-clause 15.1.
 
     "Multiplier"             means the Multiplier as described in Part 1 of
                              Schedule 3.
 
     "Network                 means the network management service and fault
      Management              reporting procedure as described in Schedule 7 to
      Service"                be provided under this Contract in relation to the
                              Service.
 
     "Operational Service     means the date as defined in paragraph 1.4 (b) of
      Date"                   Schedule 2.
 
<PAGE>
 
                                                                               7

     "Phase 1                 means the Phase 1 Transmitter Sites as defined
      Transmitter Sites"      in Part 1 of Schedule 3 and as described in Part
                              2 of Schedule 1.
 
     "Phase 2                 means the Phase 2 Transmitter Sites as defined
      Transmitter Sites"      in Part 1 of Schedule 3 and as described in Part
                              2 of Schedule 1.
 
     "Playout Centre"         means a playout centre detailed in Part 3 of
                              Schedule 1.
 
     "Playout Centre          means the owner of a Playout Centre.
      Owner"
 
     "Preliminary Testing     means the Preliminary Testing Service as
      Service"                described in Part 1 of Schedule 1.
 
     "Region"                 means a region listed in the Table at the end of
                              Part 1, Schedule 1, paragraph 2.
 
     "Service"                means the service or, where appropriate, the
                              services or part of a service, to be provided by
                              BT to the Customer as described or referred to in
                              Part 1 of Schedule 1.
 
     "Service Connection      means the initial Service Connection Charge
      Charge"                 payable by the Customer as described in
                              Schedule 2.
 
     "Service Delivery        means the respective service delivery dates set
      Dates"                  out in  Schedule 1, Part 2, column 6 by which a
                              fully operational Service is to be provided to the
                              Customer at the respective Transmitter Sites set
                              out in Schedule 1, Part 2, column 2.
 
     "Service Full Testing    means the respective service full testing dates 
      Dates"                  setout in Schedule 1, Part 2, column 5 by which
                              the Full Testing Service is to be provided for
                              Acceptance Tests at the respective Transmitter
                              Sites set out in Schedule 1, Part 2, column 2.
 
<PAGE>
 
                                                                               8

     "Service Preliminary     means the respective service preliminary Testing
      Testing Dates"          Dates set out in Schedule 1, Part 2, column 4 by
                              which the Preliminary Testing Service is to be
                              provided for Acceptance Tests to the respective
                              Transmitter Sites set out in Schedule 1, Part 2,
                              column 2.
 
     "Service Rental          means the annual Service Rental Charge payable
      Charge"                 by the Customer as described in Schedule 2.
 
     "Site"                   means the Playout Centre(s) and Transmitter
                              Site(s) as detailed in Schedule 1.
 
     "SNAP"                   means a Separacy Network Access Point, being
                              a separate, secondary point at which access or
                              egress can be provided to the DTTV Distribution
                              Network.
 
     "Transmitter Site"       means a  transmitter site detailed in Schedule 1,
                              Part 2, column 2.
 
     "Transmitter Site        means the owner of a Transmitter Site as detailed
      Owner"                  in Schedule 1, Part 2, column 3.


1.2  The Schedules form part of this Contract.  References to Clauses or Sub-
     clauses are to Clauses or Sub-clauses of this Contract;  references to
     paragraphs are to paragraphs of the appropriate Schedule.  Clause headings
     are inserted for convenience only, and will not affect the interpretation
     of this Contract.
<PAGE>
 
                                                                               9

1.3  References to Statutes or to Statutory Instruments include any modification
     or re-enactment of the same.

1.4  Except where the context otherwise requires, references to the singular
     will include the plural, and vice versa.

2.   PROVISION OF THE SERVICE

2.1  BT will provide the Service to the Customer on the terms of this Contract.

2.2  BT will provide the Preliminary Testing Service, the Full Testing Service,
     and fully operational Service to the Transmitter Sites by the respective
     Service Preliminary Testing Dates, Service Full Testing Dates, and Service
     Delivery Dates, but if BT does not do so, its only financial liability to
     the Customer will be to pay Late Delivery Payments in the circumstances
     described in Part 1 of Schedule 3.

2.3  BT has designed the network it will use to provide the Service to achieve
     a minimum 99.99% availability of Service.  However, in the nature of any
     service it cannot be guaranteed that faults will never arise.  The Customer
     will be entitled to Abatements for Loss of Service in the circumstances
     described in Part 3 of Schedule 3, and BT will provide a fault monitoring,
     reporting and repair service as part of the Network Management Service.

2.4  The performance and functionality of the Service will not be affected by
     dates, prior to, during or after 1 January 2000.  In particular:
<PAGE>
 
                                                                              10

        (a)  No value for current date will cause any interruption in operation.
        
        (b)  Date-based functionality will behave consistently for dates prior
             to, during and after 1 January 2000.

        (c)  In all interfaces and data storage, the century in any date will be
             specified either explicitly or by unambiguous algorithms or
             inferencing rules.

        (d)  Year 2000 will be recognised as a leap year.

2.5     BT may from time to time give the Customer advice concerning matters
        essential to health, safety or the quality of any telecommunications
        service provided by BT to the Customer or any other customer.

2.6     In the event of an Emergency, BT may suspend the Service in order to
        give Emergency Organisations or departments of central or local
        government access to the Service in accordance with requests made under
        Condition 9 of BT's Licence, or in order to comply with orders or
        directions of a competent authority in exercise of statutory or other
        executive powers in connection with such Emergency, and suspension in
        such circumstances will be treated as an event arising under Clause 13.

2.7 (a) BT will co-operate with the Customer's own customer DTTV Multiplex
        Service operators' systems integrators as required to enable the
        integration of the DTTV Distribution Network with the Customer's own
        customer multiplex and distribution systems, and generally in the
        provision of the Service during the term of this Contract.
        Correspondingly, the Customer will procure that such third parties co-
        operate with BT in the installation and operation of the DTTV
        Distribution Network.
 
    (b) BT will deploy its people as necessary to enable the Services to be
        available to the relevant Transmitter Sites for testing in accordance
        with the provisions of Clause 3 and to enable fully operational Services
        to commence on the Service Delivery Dates.
<PAGE>
 
                                                                              11

3.   ACCEPTANCE TESTS

3.1  BT will give the Customer 5 working days' prior notice of BT's intention to
     carry out Acceptance Tests at Sites to be specified in the notice.  The
     Customer's nominated representatives will be entitled to attend the
     Acceptance Tests, but as witnesses only.  BT will accommodate as many of
     the Customer's nominated representatives for such attendance as it
     reasonably can, and in any event a minimum of three.  BT will at all times
     remain in control of testing the Service while the Acceptance Tests are
     carried out.

3.2  Provided BT considers that the Acceptance Tests demonstrate that the
     Service meets the Acceptance Criteria, BT will notify the Customer in
     writing of the satisfactory completion of the Acceptance Tests with copies
     of the results as soon as they are available.  The Customer will respond as
     soon as reasonably practicable and in any event within 5 working days of
     receipt of such written notification and copy results, failing which the
     Service will be deemed to be acceptable and ready for provision to the
     Sites specified in such BT notice.  Where the Customer does not respond to
     this notice, any subsequent Late Delivery Payments that may become due as a
     result of such failure to respond will be reduced in accordance with the
     number of days taken by the Customer to respond to this notice.

3.3  If the Customer notifies BT that in its opinion the Service does not meet
     the Acceptance Criteria, BT will rectify the Service as soon as reasonably
     practicable in order that it meets the Acceptance Criteria.  If BT disputes
     the Customer's notice the matter will be regarded as a technical dispute
     for the purposes of Clause 14 and dealt with accordingly.

4.   BT EQUIPMENT AND SITE REQUIREMENTS, AND CUSTOMER'S CONTENT SIGNALS
     RESPONSIBILITIES

4.1  In order to be able to provide the Service, BT requires the Customer (at
     its own expense) to seek to arrange for the following at the Sites (up to
     the respective boundaries of the Sites):
<PAGE>
 
                                                                              12

     (a)  obtain and maintain all necessary landlords' consents, planning
          permissions, way-leaves and other third party consents (including
          those of Playout Centre Owners,  and Transmitter Site Owners) needed
          to install, commission, maintain, operate and use the BT Equipment at
          the Sites and connect and operate the Service at the Sites, including
          consents for any necessary alterations to buildings;

     (b)  pay all necessary connection charges, site rents, or any other fees
          required or levies made by third parties (including landlords, Playout
          Centre Owners, and Transmitter Site Owners) in connection with
          operating the Service at the Sites;

     (c)  provide a suitable environment, accommodation, foundations, power
          supplies, connection points, support and other facilities at the
          Sites, including all necessary trunking, conduits and cable trays, as
          detailed in section 11 of the Functional Design Specification in
          accordance with the relevant installation standards;

          (d)  take up or remove, any fitted or fixed floor coverings, ceiling
               tiles, suspended ceiling and partition covers, as BT advises are
               reasonably necessary, and carry out afterwards any making good or
               decorator's work as required;

     and BT will not be liable for any failure to provide Service which is due
     or mainly due to the requirements described in Sub-clauses 4.1 (a), (b),
     (c) and (d) not being met in accordance with timescales as set out in the
     Implementation Plan or not being maintained for the duration of the
     Contract, in each case to the extent that such requirements are not met or
     maintained.

4.2  The Customer's Content Signals at the Distribution Input Interfaces will be
     delivered in compliance with the specifications and standards described in
     Schedule 8. Whilst it is acknowledged that failure to provide continuous
     Customer's Content Signals does not constitute a breach of this Contract,
     the Customer will use reasonable endeavours to provide continuous
     Customer's Content Signals at the Distribution Input Interfaces. BT will
     not be liable for any failure to provide Service which is due
<PAGE>
 
                                                                              13

     or mainly due to Customer's Content Signals not being delivered
     continuously at the Distribution Input Interfaces, and/or not being
     delivered in compliance with the specifications and standards described in
     Schedule 8, in each case to the extent that Customer's Content Signals are
     not so delivered.  The Customer acknowledges that BT is not responsible for
     delivery of the Customer's Content Signals up to the Distribution Input
     Interfaces nor for onward carriage of the Customer's Content Signals from
     the Distribution Output Interfaces nor for any payments in relation
     thereto.

4.3  The Customer is responsible for the BT Equipment at all Sites and must not
     add to, modify or in any way interfere with such BT Equipment, nor allow
     anyone else (other than someone authorised by BT) to do so.  The Customer
     will be liable to BT for any loss of or damage to such BT Equipment, except
     where such loss or damage is due to fair wear and tear, an event covered by
     Clause 13, or is caused by BT or anyone acting on BT's behalf.

4.4  BT will not be liable for any failure to provide Service which is due or
     mainly due to any interference, modification, addition to, or loss or
     destruction of, BT Equipment at any Site except where such loss or damage
     is due to fair wear and tear or is caused by BT or anyone acting on BT's
     behalf.

5.   CONNECTION OF EQUIPMENT TO THE SERVICE

5.1  Any equipment connected to or used with the Service must be connected and
     used in accordance with any instructions, safety and security procedures
     applicable to the use of  that equipment.

5.2  Any equipment which is attached (directly or indirectly) to the Service
     must be technically compatible with the Service and approved for that
     purpose under any relevant legislation.
<PAGE>
 
                                                                              14

6.   ACCESS AND SITE REGULATIONS

6.1  In order to be able to provide the Service, BT requires the Customer (at
     its own expense) to seek to arrange for access, for anyone duly authorised
     for this purpose by BT, to any Site and any other premises outside BT's
     control, at all reasonable times.  During a period from 3 months prior to
     each Service Preliminary Testing Date to each Service Delivery Date, the
     Customer will seek to arrange continuous 24-hour access for BT to relevant
     Sites, but in any event BT will require a minimum level of access to
     relevant Sites as described in Schedule 5. Subsequently, to carry out any
     major planned works or maintenance, BT will require 24-hour access at Sites
     from time to time on giving 3 days' notice.  BT may also require immediate
     24-hour access at Sites to rectify faults in Service.  Otherwise, BT will
     normally only require access during its usual working hours but may, on
     reasonable notice,  require access at other times which the Customer will
     seek to arrange.

6.2  BT employees and anyone acting on BT's behalf will observe the Customer's,
     or the relevant Site owner's, reasonable Site regulations in force from
     time to time as advised in writing to BT or drawn to BT's attention at the
     Site.  In the event of any conflict between such Site regulations and this
     Contract, this Contract will prevail.

6.3  The Customer will provide a suitable and safe working environment at all
     Sites for BT employees and anyone acting on BT's behalf.

6.4  BT will not be liable for any failure to provide Service which is due or
     mainly due to the access requirements described in Sub-clause 6.1 not being
     met, to the extent that such requirements are not met, or to a suitable and
     safe working environment not being provided for BT employees or for anyone
     acting on BT's behalf at any Site, to the extent that such environment is
     not provided.
<PAGE>
 
                                                                              15

7.   USE OF THE SERVICE

7.1  It is the Customer's responsibility to obtain and keep in force any licence
     necessary for the Customer to use the Service, and not to permit any third
     party to use the Service where such third party does so in the absence of,
     or in breach of, any licence necessary for it to do so.  Without prejudice
     to the generality of the foregoing, this includes any licence or consent
     required from a Broadcasting Authority.

7.2  The Service must not be used in a way that:

     (a)  places BT in breach of BT's Licence, or in breach or contravention of
          the Telecommunications Act 1984, or of the Broadcasting Acts 1990 or
          1996, or gives rise to proceedings being taken against BT under
          Section 13 of the Broadcasting Act 1990;  or

     (b)  does not comply with any advice given by BT under Sub-clause 2.5 or
          which does not comply with Clause 5.

7.3  The Customer must indemnify BT against any claims or legal proceedings
     which are brought or threatened against BT :

     (a)  by any third party because the Service is used in breach of Sub-clause
          7.1 or 7.2; or

     (b)  by any third party the Customer permits to use the Service if the
          Service not available for use by that third party because of any
          failure of the Service;  or

     (c)  by any third party because the Customer's Content Signals are in
          breach of any duty of confidentiality or privacy, or infringe or
          prejudice any intellectual property rights, or are defamatory or
          obscene, or are otherwise unlawful.
<PAGE>
 
                                                                              16

7.4  (a)  Where any of such claims or proceedings described in Sub-clause 7.3
          are of a criminal nature, or are likely to affect BT's Licence or any
          rights or obligations of BT arising out of BT's Licence, or BT's
          compliance with, breach or contravention of, or exercise of any rights
          under, the Telecommunications Act 1984 or the Broadcasting Acts 1990
          or 1996, BT will retain conduct and control of such claims or
          proceedings but it will be a condition of this indemnity that BT will
          notify the Customer promptly in writing (so far as practicable) of any
          such claims or proceedings, make no admission in relation to the same
          without prior consultation with the Customer, and keep the Customer as
          fully informed as practicable as to the progress of such claims or
          proceedings.

     (b)  In relation to any other such claims or proceedings, it will be a
          condition of this indemnity that BT must :-

          (i)    notify the Customer promptly in writing of such claim or
                 proceeding;

          (ii)   make no admission in relation to the same;

          (iii)  allow the Customer to conduct all negotiations and proceedings,
                 subject to regular consultation with BT, and give the Customer
                 all reasonable assistance in doing so (the Customer will pay
                 BT's reasonable costs and expenses for such assistance).

7.5  If as a result of use of Service in contravention of Sub-clause 7.1 or 7.2
     BT is prevented by an injunction or other order of a court of competent
     jurisdiction from providing the Service, or receives an order or
     instruction from a competent authority to cease providing the Service, or,
     in its reasonable opinion, after consultation with the Customer, is exposed
     to criminal liability if it continues to provide the Service, without
     prejudice to its right to terminate this Contract BT may suspend the
     Service until such court order is lifted or, in the case of criminal
     liability, BT receives such
<PAGE>
 
                                                                              17

     assurances as BT reasonably considers to be sufficient that there will be
     no criminal liability arising from restoration of the Service.

7.6  The limitations and exclusions of liability contained in Clause 12 do not
     apply to this Clause.

8.   INTELLECTUAL PROPERTY RIGHTS

8.1  Where software is provided to enable the Customer to use the Service, BT
     grants the Customer a non-exclusive, non-transferable licence to use the
     software for that purpose.

8.2  The Customer will not, without BT's prior written consent, copy or (except
     as permitted by law) decompile or modify the software, nor copy the manuals
     or documentation.  The Customer will be entitled to a minimum of 3 copies
     of appropriate software, manuals and documentation.

8.3  The Customer will sign any agreement reasonably required by the owner of
     the copyright in the software to protect the owner's interest in that
     software, provided this does not result in any adverse financial
     consequences for the Customer.

9.   INTELLECTUAL PROPERTY RIGHT INDEMNITIES

9.1  BT will indemnify the Customer against all claims and proceedings arising
     from infringement of any intellectual property rights by reason of BT's
     provision of the Service to the Customer.  As a condition of this indemnity
     the Customer must:

     (a)  notify BT promptly in writing of any allegation of infringement;

     (b)  make no admission relating to the infringement;

     (c)  allow BT to conduct all negotiations and proceedings, subject to
          regular consultation with the Customer, and give BT all reasonable
          assistance in
<PAGE>
 
                                                                              18

          doing so (BT will pay the Customer's reasonable costs and expenses for
          such assistance); and

     (d)  allow BT to modify the Service, or any item provided as part of the
          Service, so as to avoid the infringement, provided that  the
          modification does not materially affect the performance of the Service
          or increase the Customer's costs.  For these purposes any reduction in
          availability of Service will be regarded as material.

9.2  The indemnity in Sub-clause 9.1 does not extend to infringements caused by
     any Customer equipment, software, or services, or any combination of them,
     used in conjunction with the Service, except in all cases where such
     matters are permitted under this Contract.  The Customer will indemnify BT
     against all claims, proceedings and expenses arising from such
     infringements on the same terms (mutatis mutandis) as the indemnity by BT
     contained in Sub-clause 9.1.

9.3  The limitations and exclusions of liability contained in Clause 12 do not
     apply to this Clause.

10.  CONFIDENTIALITY

10.1 The parties will keep in confidence any information (whether written or
     oral) of a confidential nature (including software and manuals) obtained
     under this Contract and will not disclose that information to any person,
     other than those persons listed in Schedule 9  who need to know the
     information, without the written consent of the other party.

10.2 This Clause 10 will not apply to:

     (a)  any information which has been published, other than through a breach
          of this Contract;

     (b)  information lawfully in the possession of the recipient before the
          disclosure under this Contract took place;
<PAGE>
 
                                                                              19

     (c)  information obtained from a third party who the recipient reasonably
          believed was free to disclose it; and

     (d)  information which a party is required to disclose to a competent
          regulatory authority, or information which a party is requested to
          disclose and, if it did not, could be required by law to do so.

10.3 This Clause 10 will remain in effect for as long as the information remains
     confidential, unless the parties otherwise agree.

11.  CHARGES AND DEPOSITS

11.1 The Charges for the Service, calculated in accordance with the BT Price
     List, are as set out in Schedule 2.  Charges will commence and fall due as
     specified in Schedule 2.

11.2 The Customer will pay the Charges within 45 days of the date of BT's
     invoice, provided that the invoice date will not be earlier than the
     payment dates described in Schedule 2.  BT may charge daily interest on
     late payments at a rate equal to 4% per annum above the base lending rate
     of Midland Bank plc.

12.  LIMITATION OF LIABILITY

12.1 BT accepts liability for late provision and the quality of the Service,
     other than where caused by an event covered by Clause 13, but only to the
     extent stated in Sub-clauses 2.2 and 2.3  and Schedule 3.

12.2 Each party accepts unlimited liability for death or personal injury
     resulting from its negligence.  Sub-clauses 12.3 and 12.4 do not apply to
     such liability.

12.3 Except for the Customer's obligations under Clauses 7, 11 and 15 and
     Schedule 2, and BT's obligations under Clause 9, neither party will be
     liable to the other, either in contract, tort (including negligence) or
     otherwise for any direct or indirect loss of profits, business or
     anticipated savings,  nor for any indirect or consequential loss or damage.
<PAGE>
 
                                                                              20

12.4 Except for the Customer's obligations under Clauses 7, 11 and 15 and
     Schedule 2, and BT's obligations under Clause 9, Sub-clauses 2.2 and 2.3
     and Schedule 3, each party's liability to the other in contract, tort
     (including negligence) or otherwise in relation to this Contract is limited
     to (Pounds)2 million for any one incident or series of related incidents
     and to (Pounds)4 million for all incidents in any period of 12 months.

12.5 Each provision of this Contract, excluding or limiting liability,  operates
     separately. If any part is held by a court to be unreasonable or
     inapplicable, the other parts will continue to apply.

13.  MATTERS BEYOND EITHER PARTY'S REASONABLE CONTROL

13.1 If either party is unable to perform any obligation under this Contract
     because of a matter beyond that party's reasonable control (for the
     purposes of this Clause 13, a "Force Majeure event"), such as lightning,
     flood, exceptionally severe weather, fire, explosion, war, civil disorder,
     or acts of local or central Government or other competent authorities or
     events beyond the reasonable control of that party's suppliers, that party
     will have no liability to the other for that failure to perform.  The
     period of such excused non-performance will be limited to the duration of
     the Force Majeure event, and the party unable to perform any obligation
     because of the Force Majeure event  will give prompt notice to the other of
     any claim that the performance of its obligations under this Contract is
     prevented or adversely affected by a Force Majeure event (giving details so
     far as practicable of the nature of the Force Majeure event preventing or
     adversely affecting performance and the estimated duration of non-
     performance),  will give similar notice when its performance is resumed or
     ceased to be adversely affected, and will use all reasonable endeavours to
     recommence performance as soon as practicable, to mitigate and eliminate
     the consequences of the Force Majeure event, and to inform the other party
     of the steps which it is taking or proposing to take to do so.
<PAGE>
 
                                                                              21

13.2 In the event of any failure by BT to provide Service to any single Region
     or to all Regions because of a Force Majeure event, except for any such
     Force Majeure event that  also constitutes a breach by the Customer of its
     obligations under this Contract, or a failure to meet BT's requirements as
     described in Clauses 4 and 6, or an event described in Sub-clause 4.4 (for
     the purposes of this Clause 13, an "Excluded Event") :-

     (a)  BT will consider all practicable options, depending on the nature and
          extent of any such failure, that are available to restore Service at
          the earliest practicable opportunity, including the use of alternative
          temporary facilities. Where BT considers the use of alternative
          temporary facilities would achieve an earlier restoration of Service
          than the repair of the normal facilities used to provide Service, BT
          will use all reasonable endeavours to provide such alternative
          temporary facilities as soon as reasonably practicable to provide the
          Service.  Such alternative temporary facilities will be deemed to be
          acceptable if they meet the Acceptance Criteria;

     (b)  where BT is unable to either repair the normal facilities used to
          provide Service or provide such alternative temporary facilities
          within 42 days of the commencement of the non-performance, the
          Customer will be entitled, by written notice expiring at the end of
          such 42-day period, to require this Contract to be amended such that
          the part of the Service affected by such non-performance is removed
          from this Contract and the Customer and BT are each relieved of their
          respective obligations to pay for and provide the part of the Service
          affected by such non-performance for the remainder of the term of the
          Contract;

     (c)  the Customer will only be liable to pay 50% of the annual rental
          charges (apportioned on a daily basis over a year) applying to the
          parts of the Service affected by such failure for the duration of such
          failure.
<PAGE>
 
                                                                              22

13.3 For the avoidance of doubt, the provisions of Sub-clause 13.2 will not
     apply in the event of any failure by BT to perform any obligations because
     of an Excluded Event, and in such a case the Customer will remain liable
     for payment of the full Charges.

14.  ESCALATION AND DISPUTE RESOLUTION

14.1 If a dispute arises between the parties to this Contract, the parties will
     use their reasonable endeavours to settle the dispute in accordance with
     the following procedures:

          (a)  a dispute which has not been settled by the Customer's
     representative and the BT representative within 7 days of the matter being
     raised, may be escalated by either party to the first level by written
     notice to the other party;

          (b)  if the dispute is not resolved at the first level within 7 days
     of escalation either party may refer the dispute to the second level.

     The parties' representatives and the people to whom a dispute must be
     escalated at the first and second levels are as notified by either party to
     the other from time to time.

14.2 If the dispute is a technical dispute and is still not resolved 28 days
     after escalation to the second level then the dispute may be referred to a
     single arbitrator to be agreed by BT and the Customer, or , failing
     agreement, to be appointed by the President of the Institution of
     Electrical Engineers, in accordance with and subject to the provisions of
     the Arbitration Acts 1950 to 1979 or any statutory modification or re-
     enactment of those Acts.

14.3 If a dispute is other than a technical dispute and is not resolved after
     the procedures set out in Sub-Clause 14.1 have been followed then, if the
     parties agree, the dispute will be referred to a mediator:
<PAGE>
 
                                                                              23

          (a)  the mediator will be appointed by agreement of the parties. In
               the event of a failure to agree within 3 days of a proposal by
               one party, the mediator will be appointed by the Centre for
               Dispute Resolution (CEDR);

          (b)  within 14 days of the appointment of the mediator the parties
               will meet with the mediator in order to agree the procedure to be
               adopted for the negotiations;

          (c)  all negotiations connected with the dispute will be conducted in
               confidence and without prejudice to the rights of the parties in
               any further proceedings;

          (d)  if the parties reach agreement on the resolution of the dispute
               the agreement will be put in writing and once signed by the
               parties will be binding on them;

          (e)  if the parties are not prepared to agree to the dispute being
               referred to a mediator or fail to reach agreement within 2 months
               of the mediator being appointed then either party may exercise
               any remedy that it has under this Contract.

15.  TERMINATION OF THIS CONTRACT BY NOTICE

15.1 This Contract will terminate automatically at the expiry of the Minimum
     Period unless both parties agree to extend or renew it, provided that the
     Customer may extend the duration of the Minimum Period of this Contract for
     a period of up to nine months upon giving BT written notice not later than
     the eleventh anniversary of the first Service Delivery Date.

15.2 If the Customer terminates this Contract or the Service during the Minimum
     Period (other than in accordance with a right under in this Contract) the
     Customer must pay BT a sum equal to the Charges for the remaining part of
     the Minimum Period, discounted, in recognition of the Charges being paid in
<PAGE>
 
                                                                              24


     a lump sum to BT upon termination, by using the 3 month Sterling London
     Interbank Offer Rate quoted by Midland Bank plc, London on the date of
     termination.  Such sum will be paid by the Customer within 45 days of BT's
     invoice, and BT may charge daily interest on late payment in accordance
     with Sub-clause 11.2.

15.3 In mitigation of BT's losses on termination in breach by the Customer as
     described in Sub-clause 15.2 :-

(a)  BT will use all reasonable endeavours to contract to provide DTTV Service
     to other customers using the facilities used to provide the Service under
     this Contract, provided that BT will not be required to contract on a basis
     other than the standard prices, terms and conditions applicable to the DTTV
     Service.  Provided the Customer has paid the sum described in Sub-clause
     15.2, BT will pay to the Customer the money it obtains from any such other
     customer(s) (less BT's reasonable costs and expenses (if any) incurred in
     contracting with any such customer(s)) to the extent that the money
     obtained from such other customer(s) relates to facilities utilised to
     provide the Service under this Contract and provided that such payment(s)
     will not exceed in total the sum paid by the Customer under Sub-clause
     15.2.  Such payment(s) will be made by BT within 45 days of receipt, and
     the Customer may charge interest on late payment at a rate equal to 4% per
     annum above the base lending rate of Midland Bank plc;  and

(b)  If BT has not been able to so contract with another customer within 12
     months of such termination in breach by the Customer, BT will use all
     reasonable endeavours to redeploy and reutilise any of the facilities used
     to provide Service under this Contract on reasonable terms, subject to any
     regulatory considerations that may apply. Provided the Customer has paid
     the sum described in Sub-clause 15.2, BT will pay to the Customer any money
     it obtains from such redeployment or reutilisation less BT's reasonable
     costs and expenses (if any) incurred in such redeployment or reutilisation,
     provided that such payments will not exceed in total the sum paid by the
     Customer under Sub-clause 15.2. Such payment(s) will be made by BT
<PAGE>
 
                                                                              25

     within 45 days of receipt, and the Customer may charge interest on late
     payment at a rate equal to 4% per annum above the base lending rate of
     Midland Bank plc.

15.4 In addition to any rights of termination specified elsewhere in this
     Contract, if the industry for digital terrestrial television services as a
     whole fails, such that all holders of Broadcasting Authority licences or
     other UK government authorisations permanently cease to provide digital
     television services and all Broadcasting Authority licences or other UK
     government authorisations are permanently terminated, surrendered,
     withdrawn or otherwise revoked or ceased, then :-

     (a)  if such event occurs on or after the fifth anniversary of the first
          Service Delivery Date, the Customer will be entitled to terminate the
          Contract on giving BT twelve calendar months' written notice, without
          liability for any further payment other than the Charges payable
          during the notice period;  or

     (b)  if such event occurs prior to the fifth anniversary of the first
          Service Delivery Date, the Customer may terminate this Contract on one
          month's written notice, subject to payment, prior to expiry of the
          notice, of a sum equivalent to all Charges payable by the Customer
          from the date such notice was given up to the fifth anniversary of the
          first Service Delivery Date, discounted by using the 3 month Sterling
          London Interbank Offer Rate quoted by Midland Bank plc, London on the
          date of termination.

15.5 If the Customer (other than as a result of an event described in Sub-clause
     16.1 (d) or as a result of any breach by the Customer of its Broadcasting
     Authority licence or other UK government authorisation) permanently ceases,
     in good faith, to provide one or more of the DTTV Multiplex Services for
     which it has a Broadcasting Authority licence or other UK government
     authorisation, such that its Broadcasting Authority licence or other UK
     government authorisation is permanently terminated, surrendered, withdrawn
     or otherwise revoked or ceased, and is not
<PAGE>
 
                                                                              26

transferred or reissued to a connected company, then :-

     (a)  the Customer will use all reasonable endeavours in good faith to
          effect a transfer to any replacement licensee or other UK government
          authorisee of the part of the Service used to provide such permanently
          ceased DTTV Multiplex Service, but if such transfer does not take
          place, then

     (b)  the Customer will be entitled, by written notice, to require this
          Contract to be amended such that the part of the Service used to
          provide such permanently ceased DTTV Multiplex Service is removed from
          this Contract and the Customer and BT are each relieved of their
          respective obligations to pay for and provide such part of the Service
          from the fifth anniversary of the first Service Delivery Date, or if
          such notice is given after the fifth anniversary of the first Service
          Delivery Date, from twelve calendar months from the date of the
          notice.

16.  BREACHES OF THIS CONTRACT

16.1 Either party may terminate this Contract without notice if the other:

     (a)  commits a material breach of this Contract, which is capable of
          remedy, and fails to remedy the breach as soon as is reasonably
          practicable or in any event within 30 days of a written notice to do
          so; or

     (b)  commits a material breach of this Contract which cannot be remedied;
          or

     (c)  is repeatedly in breach of this Contract; or

     (d)  is the subject of a bankruptcy order, or becomes insolvent, or makes
          any arrangement or composition with or assignment for the benefit of
          their creditors, or goes into voluntary (otherwise than for
          reconstruction or
<PAGE>
 
                                                                              27

     amalgamation) or compulsory liquidation or a receiver or administrator is
     appointed over their assets.

16.2 If the Customer commits any of the acts detailed in Sub-clauses 16.1 (a) or
     (c), or an event detailed in Sub-clause 16.1 (d) happens to the Customer,
     (except for acts or events covered by Sub-clause 7.5), BT may suspend the
     Service without prejudice to its right to terminate this Contract, provided
     that in the case of a suspension under Sub-clauses (a) or (c) BT must,
     after the expiry of 45 days, either resume Service or exercise its right to
     terminate this Contract.  Where the Service is suspended under this Clause,
     the Customer must pay the charges for the Service until this Contract is
     terminated.

16.3 If this Contract is terminated by BT during the Minimum Period because of
     an event specified in Sub-clause 16.1, the Customer must pay BT a sum
     calculated in accordance with Sub-clause 15.2.

16.4 If either party delays in acting upon a breach of this Contract that delay
     will not be regarded as a waiver of that breach.  If either party waives a
     breach of this Contract that waiver is limited to that particular breach.

17.  CHANGES TO THIS CONTRACT

17.1 Changes to the Service

     (a)  If the Customer wishes to change the location of the Playout Centres
          from which, or the Transmitter Sites to which, the Service is
          provided, or to make any other changes to the Service, it must notify
          BT in writing.

     (b)  The parties will discuss the proposed change.

     (c)  Within a reasonable time of receipt of a proposed change, or the date
          of the discussions under Sub-clause 17.1(b), BT will notify the
          Customer in writing whether or not BT can accommodate the change, and
          of the likely
<PAGE>
 
                                                                              28

            timescale, financial, contractual, technical and other effects (if
            any) of the proposed change.

     (d)    Within a reasonable time of notification of the effects of a
            proposed change the Customer will advise BT whether it wishes this
            Contract to be amended to incorporate the change and BT will carry
            out such change on the terms agreed.

PROVIDED THAT BT agrees that, in any event :-

     (i)    where the Customer requires the Service to be provided to additional
            transmitter sites (other than the Transmitter Sites), subject to the
            maximum specified in paragraph 2 of Schedule 2, the formula to be
            applied to calculate the Charges for additional transmitter site
            access payable by the Customer in such circumstances will be that
            set out in paragraph 2 of Schedule 2, and BT will comply with any
            such request subject to completion of the appropriate Contract
            Change Order and to six months' prior written notice of the new
            Service Preliminary Testing Date;

     (ii)   where the Customer requests BT to reconfigure the Service to meet
            any changes to its (or its own customer DTTV Multiplex Service
            operators') regional distribution requirements, BT will consider
            such requests and if feasible, carry out any such changes, provided
            the Customer will pay any reasonable additional charge;

     (iii)  where appropriate, if the Customer requests BT to make changes to
            the Service which are for the benefit of one of the Customer's own
            customer digital television multiplex operators, any proposals BT
            makes for consequential adjustment of the Charges will be calculated
            solely in relation to such customer of the Customer.
<PAGE>
 
                                                                              29

17.2    Changes to dates

17.2.1  Where the actual industry launch date for digital terrestrial television
        services, as agreed with all other customers for the DTTV Service, is
        later than 31 October 1998, the Customer will be entitled to substitute
        the earlier of such actual industry launch date or 31 January 1999 for
        31 October 1998 in the definition of the Minimum Period in Clause 1, so
        that the Minimum Period expires of the 12th anniversary of such
        substituted date, by giving three months' prior written notice to BT
        expiring not later than 31 October 1998. Where such notice is given:-

        (a)   the Service Preliminary Testing Dates, the Service Full Testing
              Dates, and the Service Delivery Dates (both for Phase 1 and Phase
              2 Transmitter Sites) will each be commensurately deferred unless
              the parties agree otherwise; and

        (b)   amendments reflecting such deferral of dates will be deemed to be
              made to Part 1 of Schedule 3, such that Late Delivery Payments
              will apply only in respect of the respective deferred dates; and

        (c)   the Implementation Plan will be amended to reflect such deferral
              of dates.

17.2.2  If the Customer is unable to use the Service at any particular Phase 2
        Transmitter Site due to inability to obtain frequency clearance to
        transmit from such Phase 2 Transmitter Site, then, subject to giving
        four months prior written notice expiring not later than the Service
        Preliminary Testing Date for such Phase 2 Transmitter Site, the Customer
        may either postpone delivery of Service to such Phase 2 Transmitter
        Site, or substitute an alternative transmitter site for delivery of the
        Service, provided that:-

        (a)   When frequency clearance is obtained in respect of such Phase 2
              Transmitter Site or any substituted transmitter site, the Customer
              will give BT six months' prior written notice of the new Service
              Preliminary Testing Date applying to the provision of Preliminary
              Testing Service to such
<PAGE>
 
                                                                              30

            Phase 2 Transmitter Site, and the new Service Full Testing Date for
            provision of Full Testing Service to such deferred or substituted
            Phase 2 Transmitter Site will be not earlier than 31 days after the
            new Service Preliminary Testing Date, and the new Service Delivery
            Date for provision of fully operational Service to such deferred or
            substituted Phase 2 Transmitter Site will not be earlier than 30
            days after the new Service Full Testing Date; and

       (b)  amendments reflecting such deferral of dates will be deemed to be
            made to Part 1 of Schedule 3, such that Late Delivery Payments will
            apply only in respect of any delays beyond the respective deferred
            dates; and

        (c)  the Implementation Plan will be amended to reflect such deferral of
             dates.

17.2.3  If any changes are agreed to any of the Service Preliminary Testing
        Dates, Service Full Testing Dates, or Service Delivery Dates in relation
        to any Transmitter Site, then such changes will, unless otherwise
        agreed, have effect to change such other Dates in relation to that Site
        to reflect their current respective intervals, and to invoke a review of
        the Implementation Plan in order to make appropriate changes to reflect
        such revised Dates.

17.3    At agreed intervals of not less than 4 years the parties will
        collaborate on a technical review of the BT Equipment and other
        distribution equipment available on the market. Where opportunities are
        identified, from such technical review, to improve or enhance the
        Service, or to operate the Service more cost effectively the parties
        will co-operate in good faith. Should there be such an opportunity to
        operate the Service more cost-effectively BT will share with the
        Customer and other customers for the DTTV Service any benefits arising
        from such technology improvement with due regard to the need for BT to
        achieve a reasonable rate of return on both the item(s) of new BT
        Equipment which is/are required to be installed and of the original BT
        Equipment which is/are required to be replaced or is/are rendered
        obsolete as a result of the implementation of such improvements.
<PAGE>
 
                                                                              31

17.4 Where the parties agree a change to this Contract it will be recorded in
     writing on a Contract Change Order Form in the form set out in Schedule 10
     and will then form part of this Contract when signed by both parties.

18.  INSURANCE

     Throughout the period of this Contract both parties will maintain
     appropriate insurance against loss, damages, claims or actions arising from
     personal injury, public liability and any other liability for which either
     is required by law to insure.

19.  ASSIGNMENT

     Neither party  may assign or transfer any of their rights or obligations
     under this Contract, without the written consent of the other, except that
     BT may assign or transfer its rights or obligations (or both) to a BT Group
     Company without consent, and BT will not unreasonably refuse consent to the
     Customer's transferring its rights and obligations under this Contract to
     another DTTV Multiplex Service operator or to a Group Company of the
     Customer.

20.  ENTIRE AGREEMENT

20.1 This Contract contains the whole agreement between the parties and
     supersedes all previous written or oral agreements relating to its subject
     matter.

20.2 The parties  acknowledge and agree that:

     (a)  they have not been induced to enter into this Contract by any
          representation, warranty or other assurance not expressly incorporated
          into it; and

     (b)  in connection with this Contract their only rights and remedies in
          relation to any representation, warranty or other assurance are for
          breach of this
<PAGE>
 
                                                                              32

          Contract and that all other rights and remedies are excluded, except
          in the case of fraud.

21.  NOTICES

     Notices given under this Contract must be in writing and may be delivered
     by hand or by courier, or sent by telex or first class post to the
     following addresses:

     (a)  to BT: Senior Business Manager Terrestrial Services, Broadcast
          Services, 125 Shaftesbury Avenue, London WC2H 8BE or any alternative
          address which BT notifies to the Customer;

     (b)  to the Customer at the address to which the Customer asks BT to send
          invoices, the address of the Customer's premises or, if the Customer
          is a limited company, its registered office.


Signed on behalf of
British Telecommunications plc                /s/ J. P. Swingewood
                                             ...................................


Name                                              J. P. Swingewood
                                             ...................................


Position                                     Director Multimedia Services
                                             ...................................



Signed on behalf of
Castle Transmission International Ltd        ...................................


Name:     Alan Rees                            /s/ Alan Rees
                                             ...................................
          Chief Operating Officer                       (signature)


<PAGE>
 
                                                                              33

                                   SCHEDULE 1
                                   ----------

                           DESCRIPTION OF THE SERVICE
                           --------------------------

INDEX
- -----

Part 1 :       Service
Part 2 :       Transmitter Sites, Transmitter Site Owners, Service Preliminary
               Testing Dates, Service Full Testing Dates, Service Delivery Dates
Part 3 :       Playout Centres
Part 4 :       Regional Distribution from Playout Centres to Transmitter Sites
Part 5 :       Transmitter Site Provisioning Plans
<PAGE>
 
                                                                              34

                                   SCHEDULE 1
                                   ----------

                               PART 1:    SERVICE
                               ------------------

1.   GENERAL

1.1  The Service is a uni-directional service, provided via a diversely routed
     network for the distribution of the Customer's Content Signals provided
     from a Distribution Input Interface to a Distribution Output Interface, in
     accordance with the description as detailed in this Schedule and the
     Functional Design Specification.

1.2  The DTTV Distribution Network will provide capacity for the carriage of
     Service Information ("SI") from a central SI Collation Site, which will be
     located at either British Digital Broadcasting Plc's premises at Marco Polo
     House, 346, Queenstown Road, London SW8 4NE, or at the Channel 4 Television
     Corporation's premises at Channel 4, 124, Horseferry Road, London SW1P 2TX
     (to be agreed) ("the central SI Collation Site"), to Transmitter Sites
     designated as Service Insertion Points ("SIPs"). BT will accept the
     Customer's DTTV Multiplex Services feeds and deliver these signals to
     agreed main and daughter Transmitter Sites.  The SI capacity will be
     diversely routed.  The network design will ensure that the two feeds are
     physically and electrically separate.  BT will provide 5 Mbit/s of capacity
     relating to all digital multiplexes from the central SI Collation Site
     throughout the DTTV Distribution Network for use by all customers for the
     DTTV Service.

     Part 4 of Schedule 1 provides a list of SIP Transmitter Sites and their
     associated daughter Transmitter Sites, which may be subject to review,
     following discussion by the Digital Network Group.

     The industry's arrangements for the carriage of SI have yet to be defined.
     The exact arrangements will be defined when the solution is known. Provided
     that such arrangements are notified to BT by not less than four
<PAGE>
 
                                                                              35

      months prior to the first Service Delivery Date, BT will provide capacity
      to the Customer for carriage of SI to each Transmitter Site by its
      respective Service Delivery Date.

1.3   Service monitoring and management systems will provide both BT and the
      Customer with appropriate network status and management information in
      accordance with the Network Management Service described in Schedule 7.
      The Network Management Service will be available to each Transmitter Site
      from its respective Service Full Testing Date.

1.4   Initially, the Service will be provided via two unswitched DVB ASI
      transport streams at each Distribution Output Interface, but BT will
      provide, by no later than the expiry of twelve calendar months after the
      first Service Delivery Date, an output switching facility at each
      Transmitter Site and RPOC (but not at Playout Centres) providing two
      continuous DVB ASI transport streams such that, in the event of a single
      failure, output switching and restoration can take place, provided that,
      in respect of Transmitter Sites where the Service Full Testing Date occurs
      after the expiry of twelve calendar months after the first Service
      Delivery Date, such switching facility will be made available on their
      respective Service Full Testing Dates. Such switching facility will not
      include any switching or restoration associated with SI.

2.    CUSTOMER-SPECIFIC SERVICE DESCRIPTION

2.1   Service for Customer's Content Signals originating from BDB

2.1.1 The Customer will provide two identical feeds of each of the Customer's
      Content Signals in respect of each of BDB's three DTTV Multiplex Services
      to BT Distribution Input Interfaces (designated Feed A and Feed B) for
      interconnection with BT provided ASI multiplexes located within the BDB
      London Playout Centre detailed in Schedule 1, Part 3, Table 1.

2.1.2 Access to the DTTV Distribution Network will be provided from BDB's London
      Playout Centre via seperately routed fibre optic circuits. One route will
      terminate
<PAGE>
 
                                                                              36

       at a BT CNAP. The second route will terminate at a (separate) BT SNAP.

2.1.3  The Customer's Content Signals will be conveyed throughout the diversely
       routed fibre optic DTTV Distribution Network capacity via further CNAPs
       and SNAPs. The network will be designed such that the A Feed and B Feed
       will be physically and electrically separate.

2.1.4  The DTTV Distribution Network will support a maximum of the seven
       regional feeds for BDB set out in the Table at the end of this paragraph
       2.1 below. Each regional feed will be carried to the relevant CNAP and
       SNAP where it will be combined with the appropriate regional feed for the
       Customer's Content Signals originating from the BBC.

2.1.5  At the terminal CNAP and SNAP for each region, diversely routed capacity
       will be provided by BT to convey the A and B Feed to the SIP Transmitter
       Sites and their respective associated Dependent Transmitter Sites shown
       in Schedule 1, Part 4, Table 1. The network design will be designed such
       that the two feeds will be physically and electrically separate. At
       Sites, BT will aim for physical separacy of A and B Feeds of 4 metres,
       unless constrained by local conditions or restrictions imposed by Site
       owners.

2.1.6  Each of the three BDB DTTV Multiplex Services will have a nominal total
       bitrate of 24.1 Mbit/s (together totalling 72 Mbit/s from BDB's London
       Playout Centre), being useable bitrate without error correction or system
       overheads, but excluding SI capacity.

2.1.7  Subject to paragraph 1.2 above, the DTTV Distribution Network will
       provide capacity for the carriage of SI from the central SI Collation
       Site to Transmitter Sites. At the respective Transmitter Sites shown in
       column 2, Table 2, Part 4, Schedule 1 ("SIP Transmitters") BT will accept
       feeds for SI for both BDB and BBC DTTV Multiplex Services and deliver
       them to their respective associated Transmitter Sites shown in column 2,
       Table 2, Part 4, Schedule 1 ("Dependent Transmitters"). The network will
       be designed such that the two feeds will be physically and electrically
       separate.
<PAGE>
 
                                                                              37

2.1.8  Circuits from CNAPs and SNAPs to Transmitter Sites will be provided using
       a mixture of fibre, line systems and radio technology. Part 5 of Schedule
       1 sets out provisioning plans for each Transmitter Site.

                                     TABLE

<TABLE>
<CAPTION>
         REGION            DESTINATION 1    DESTINATION     DESTINATION   DESTINATION 
                                                  2               3            4    
       ------------------------------------------------------------------------------
       <S>                 <C>              <C>             <C>           <C>       
       1  Midlands         Birmingham                                               
       ------------------------------------------------------------------------------
       2  South            Southampton         Plymouth       Jersey/1/             
       ------------------------------------------------------------------------------
       2  South            Bristol                                                  
       ------------------------------------------------------------------------------
       2  South            Norwich                                                  
       ------------------------------------------------------------------------------
       3  North            Manchester          Leeds          Carlisle     Newcastle 
       ------------------------------------------------------------------------------
       4  Scotland         Glasgow             Aberdeen                             
       ------------------------------------------------------------------------------
       5  N Ireland        Belfast                                                  
       ------------------------------------------------------------------------------
       6  Wales            Cardiff                                                  
       ------------------------------------------------------------------------------
       7  London           London                                                   
       ------------------------------------------------------------------------------
</TABLE>

NOTES :
 
/1/    Exact arrangements for Jersey are under discussion

2.2    Service for Customer's Content Signals originating from BBC

2.2.1  The Customer will provide two identical feeds of the Customer's Content
       Signals in respect of the BBC's DTTV Multiplex Service from each of the
       Playout Centres detailed in Schedule 1, Part 3, Table 2 to BT
       Distribution Input Interfaces (designated Feed A and Feed B) for
       interconnection with BT provided ASI multiplexes located within each
       Playout Centre.

2.2.2  Access to the DTTV Distribution Network will be provided from each
       Playout Centre via diversely routed fibre optic circuits. One route will
       terminate at a BT CNAP. The second route will terminate at a (separate)
       BT SNAP.

2.2.3  At the terminal CNAP and SNAP for each region, diversely routed capacity
       will be provided by BT to convey the A and B Feed to the SIP Transmitter
       Sites and their
<PAGE>
 
                                                                              38

       respective associated Dependent Transmitter Sites shown in Schedule 1,
       Part 4, Table 2. The network will be designed such that the two feeds
       will be physically and electrically separate. At Sites, BT will aim for
       physical separacy of A and B Feeds of 4 metres, unless constrained by
       local conditions or restrictions imposed by Site owners.

2.2.4  The BBC DTTV Multiplex Service will have a nominal total bitrate of 24.1
       Mbit/s from each Playout Centre, being useable bitrate without error
       correction or system overheads, but excluding SI capacity. Where there
       are sub-regions, two may be combined into a single feed distribution feed
       with the appropriate feed delivered to each Transmitter Site.

2.2.5  For SI capacity, see paragraphs 1.2 and 2.1.7 above.

2.2.6  Circuits from CNAPs and SNAPs to Transmitter Sites will be provided using
       a mixture of fibre, line systems and radio technology. Part 5 of Schedule
       1 sets out provisioning plans for each Transmitter Site.

3.     PRELIMINARY TESTING SERVICE AND FULL TESTING SERVICE

3.1    Preliminary Testing Service will consist of one feed of Customer's
       Content Signals to the relevant Transmitter Sites. BT will make
       reasonable endeavours to provide two feeds of Customer's Content Signals
       (Feed A and Feed B), available for network testing by the Customer, to
       the relevant Transmitter Sites, but in the event of only one such feed
       being available this will be acceptable for the purposes of the
       Preliminary Testing Service. Preliminary Testing Service will not include
       SI or Network Management Service.

3.2    Full Testing Service will consist of the provision of two feeds of
       Customer's Content Signals (Feed A and Feed B), available for network
       testing by the Customer, to the relevant Transmitter Sites. Full Testing
       Service will include Network Management Service, but will not include SI.

3.3    Fully operational Service will consist of the provision of two feeds of
       Customer's Content Signals (Feed A and Feed B) to the relevant
       Transmitter Sites.
<PAGE>
 
                                                                              39

     Fully operational Service will include output switching facilities, to be
     introduced in accordance with paragraph 1.4 above, and will also include
     Network Management Service and, subject to paragraph 1.2 above, SI.

4.   DISTRIBUTION INPUT AND OUTPUT INTERFACE CHARACTERISTICS

4.1  Distribution Input Interfaces will comply with the following:-

     4.1.1  Electrical:-

          (a)  Customer's transport streams must be DVB compliant in ASI format,
               being non-interleaved, byte stuffed ASI streams optimised for
               maximum linearity conforming to DVB BLUE BOOK A010 REV 1.0
               "Interfaces for CATV/SMATV Headends and Similar Professional
               Equipment", May 1997.  (BT cannot provide full monitoring of the
               ASI streams if data interleaving is present);

          (b)  signals to preferably have RS encoding 188/204;

          (c)  termination / source impedance to be 75 ohms unbalanced;

          (d)  the input signal will preferably  be continuous and will be error
               free;

4.1.2  Physical:-

          (a)  a MUSA patch panel will be provided with each set of BT terminal
               equipment.  The patch panel will act as the Customer to BT signal
               interface point;

          (b)  all Customer connections will be by means of BNC connectors at
               the rear of the patch panel;

          (c)  test access points will be provided using MUSA U-Links.
<PAGE>
 
                                                                              40

4.2  Distribution Output Interfaces will comply with the following:-

4.2.1  Electrical:-

          (a)  signal interface will be DVB ASI as DVB BLUE BOOK A010 REV 1.0
               "Interfaces for CATV/SMATV Headends and Similar Professional
               Equipment", May 1997;

          (b)  termination / source impedance will be 75 ohms unbalanced;

4.2.2  Physical:-

          (a)  a MUSA patch panel will be provided near each set of BT terminal
               equipment as a BT to Customer signal hand over point;

          (b)  all Customer connections will be by means of BNC connectors at
               the rear of the patch panels;

          (c)  test access points will be provided using MUSA U-Links.
<PAGE>
 
                                                                              41

                                  SCHEDULE 1
                                  ----------

   PART 2 : TRANSMITTER SITES, TRANSMITTER SITE OWNERS, SERVICE PRELIMINARY
   ------------------------------------------------------------------------
      TESTING DATES, SERVICE FULL TESTING DATES, SERVICE DELIVERY DATES.
      -----------------------------------------------------------------

PHASE 1
- -------

<TABLE>
<CAPTION>
                                             
                                             SERVICE                           
NUMBER    TRANSMITTER      TRANS-            PRELIMINARY  SERVICE     SERVICE  
          SITES            MITTER SITE       TESTING      TESTING     DELIVERY 
                           OWNER             DATES        DATES       DATES     
<S>       <C>              <C>               <C>          <C>         <C>
1         Pontop Pike      CTI               [*]          [*]         [*]
                                                                    
2         Belmont          NTL               [*]          [*]         [*]
                                                                    
3         Wenvoe           CTI               [*]          [*]         [*]
                                                                    
4         Blackhill        NTL               [*]          [*]         [*]
                                                                    
5         Caldbeck         NTL               [*]          [*]         [*]
                                                                    
6         Caradon Hill     NTL               [*]          [*]         [*]
                                                                    
7         Emley Moor       NTL               [*]          [*]         [*]
                                                                    
8         Durris           NTL               [*]          [*]         [*]
                                                                    
9         Craigkelly       NTL               [*]          [*]         [*]
                                                                    
10        Winter Hill      NTL               [*]          [*]         [*]
                                                                    
11        Stockland Hill   NTL               [*]          [*]         [*]
</TABLE>                                                           
                                                                   
[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              42
                                                                   
<TABLE>                                                            
<CAPTION>                                                          
NUMBER    TRANSMITTER        TRANS-          SERVICE                           
          SITES              MITTER          PRELIMINARY  SERVICE     SERVICE 
                             SITE            TESTING      TESTING     DELIVERY
                             OWNER           DATES        DATES       DATES    
<S>       <C>                <C>             <C>          <C>         <C>   
12        Sutton Coldfield   CTI             [*]          [*]         [*]  
                                                                         
13        Crystal Palace     CTI             [*]          [*]         [*]  
                                                                           
14        Bilsdale           CTI             [*]          [*]         [*]  
                                                                           
15        Mendip             CTI             [*]          [*]         [*]  
                                                                           
16        Waltham            CTI             [*]          [*]         [*]  
                                                                           
17        Hannington         CTI             [*]          [*]         [*]  
                                                                           
18        Divis              CTI             [*]          [*]         [*]  
                                                                           
19        Rowridge           CTI             [*]          [*]         [*]  
                                                                           
20        Sandy Heath        NTL             [*]          [*]         [*]  
                                                                           
21        Oxford             CTI             [*]          [*]         [*]  
                                                                           
22        Moel y Parc        CTI             [*]          [*]         [*]  
                                                                           
23        Sudbury            CTI             [*]          [*]         [*]  
                                                                           
24        Fremont Point      NTL             [*]          [*]         [*]   
</TABLE>                                                     
                                                             
                                                             
*THE AGREEMENT OF THE DATES FOR THIS TRANSMITTER SITE IS SUBJECT TO JERSEY
- --------------------------------------------------------------------------
TELECOM DELIVERY WHICH BT WILL USE ALL REASONABLE EFFORTS TO OBTAIN.
- -------------------------------------------------------------------
                                                             
[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              43
                                                             
PHASE 2                                                      
- -------                                                      
                                                             
<TABLE>                                       SERVICE     
<CAPTION>                                     PRELIMINARY  SERVICE     SERVICE
NUMBER    TRANSMITTER      TRANS-MITTER       TESTING      TESTING     DELIVERY
          SITES            SITE OWNER         DATES        DATES       DATES    
<S>       <C>              <C>                <C>          <C>         <C> 
25        Bluebell Hill    CTI                [*]          [*]         [*]  
                                                              
26        Tacolneston      CTI                [*]          [*]         [*]  
                                                              
27        Darvel           NTL                [*]          [*]         [*]  
                                                                      
28        Angus            NTL                [*]          [*]         [*]  
                                                                           
29        Midhurst         CTI                [*]          [*]         [*] 
                                                                           
30        Selkirk          NTL                [*]          [*]         [*] 
                                                                           
31        Rumster Forest   NTL                [*]          [*]         [*] 
                                                                           
32        Kilvey Hill      CTI                [*]          [*]         [*] 
                                                                           
33        Ridge Hill       NTL                [*]          [*]         [*] 
                                                                           
34        Saddleworth      NTL                [*]          [*]         [*] 
                                                                           
35        Heathfield       CTI                [*]          [*]         [*] 
                                                                          
36        Blaenplwyf       CTI                [*]          [*]         [*] 
                                                                           
37        Beacon Hill      NTL                [*]          [*]         [*] 
                                                                           
38        Carmel           CTI                [*]          [*]         [*] 
                                                                           
39        Sheffield        CTI                [*]          [*]         [*] 
</TABLE>                                                             
                                                                     
[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 

<TABLE>                                                              
<CAPTION>                                                            
                                             SERVICE     
                                             PRELIMINARY  SERVICE     SERVICE
NUMBER    TRANSMITTER      TRANS-MITTER      TESTING      TESTING     DELIVERY  
          SITES            SITE OWNER        DATES        DATES       DATES   
<S>       <C>              <C>               <C>          <C>         <C> 
40        Limavady         CTI               [*]          [*]         [*] 
                                                                     
41        Nottingham       NTL               [*]          [*]         [*] 
                                                                     
42        Dover            NTL               [*]          [*]         [*] 
                                                                     
43        Whitehawk Hill   CTI               [*]          [*]         [*] 
                                                                     
44        Fenham           CTI               [*]          [*]         [*] 
                                                                     
45        Llandona         CTI               [*]          [*]         [*] 
                                                                     
46        Guildford        CTI               [*]          [*]         [*] 
                                                                     
47        Presely          NTL               [*]          [*]         [*] 
                                                                     
48        Rosemarkie       CTI               [*]          [*]         [*] 
                                                                     
49        Hemel            CTI               [*]          [*]         [*] 
          Hempstead                                                  
                                                                     
50        Lancaster        NTL               [*]          [*]         [*] 
                                                                     
51        Bristol IC       CTI               [*]          [*]         [*] 
                                                                     
52        Idle             NTL               [*]          [*]         [*] 
                                                                     
53        Brougher         CTI               [*]          [*]         [*] 
          Mountain                                                   
                                                                     
54        Redruth          CTI               [*]          [*]         [*] 
                                                                     
55        Hastings         CTI               [*]          [*]         [*] 
                                                                     
56        Chesterfield     NTL               [*]          [*]         [*] 
                                                                     
57        Bromsgrove       CTI               [*]          [*]         [*] 
</TABLE>                                                             
                                                                     
[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              45
                                                                     
<TABLE>                                                              
<CAPTION>                                                            
                                             SERVICE                         
                                             PRELIMINARY  SERVICE   SERVICE
NUMBER    TRANSMITTER      TRANS-MITTER      TESTING      TESTING   DELIVERY
          SITES            SITE OWNER        DATES        DATES     DATES   
<S>       <C>              <C>               <C>          <C>       <C> 
58        Pendle Forest    NTL               [*]          [*]       [*] 
                                                                     
59        Chatton          NTL               [*]          [*]       [*] 
                                                                     
60        Reigate          CTI               [*]          [*]       [*] 
                                                                     
61        Malvern          CTI               [*]          [*]       [*] 
                                                                     
62        Rosneath         NTL               [*]          [*]       [*] 
                                                                     
63        Bristol Kings    CTI               [*]          [*]       [*] 
          Weston                                                        
                                                                        
64        Fenton           CTI               [*]          [*]       [*] 
                                                                        
65        Storeton         CTI               [*]          [*]       [*] 
                                                                        
66        Tunbridge Wells  CTI               [*]          [*]       [*] 
                                                                        
67        The Wrekin       CTI               [*]          [*]       [*] 
                                                                        
68        Plympton         NTL               [*]          [*]       [*] 
                                                                        
69        Salisbury        CTI               [*]          [*]       [*] 
                                                                        
70        Larkstoke        CTI               [*]          [*]       [*] 
                                                                        
71        Keighly          NTL               [*]          [*]       [*] 
                                                                        
72        Huntshaw Cross   NTL               [*]          [*]       [*] 
                                                                        
73        Knock More       NTL               [*]          [*]       [*] 
                                                                        
74        Aberdare         CTI               [*]          [*]       [*] 
                                                                        
75        Eitshal          CTI               [*]          [*]       [*]  
</TABLE>                                                             
                                                                     
[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              46

<TABLE> 
<CAPTION>                                                                      
                                            
                                            SERVICE                          
NUMBER    TRANSMITTER      TRANS-           PRELIMINARY  SERVICE     SERVICE 
          SITES            MITTER SITE      TESTING      TESTING     DELIVERY
                           OWNER            DATES        DATES       DATES   
<S>       <C>              <C>              <C>          <C>         <C>  
76        Brierley Hill    CTI               [*]          [*]          [*]
                                                                       
77        Olivers Mount    CTI               [*]          [*]          [*]
                                                                       
78        Keelylang Hill   CTI               [*]          [*]          [*]
                                                                       
79        Pontypool        CTI               [*]          [*]          [*]
                                                                       
80        Torosay          CTI               [*]          [*]          [*]
                                                                       
81        Bressay          CTI               [*]          [*]          [*]
</TABLE>

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              47

                                   SCHEDULE 1
                                   ----------

                           PART 3 :  PLAYOUT CENTRES
                           -------------------------

                         TABLE 1 :  BDB PLAYOUT CENTRE
                         -----------------------------
                                        
British Digital Broadcasting
Marco Polo House
346, Queenstown Road,
London, SW8 4NE.
<PAGE>
 
                                                                              48

                                   SCHEDULE 1
                                   ----------

                           PART 3 :  PLAYOUT CENTRES
                           -------------------------

                         TABLE 2 :  BBC PLAYOUT CENTRES
                         ------------------------------
                                        
BBC Belfast
Broadcasting House,
Ormeau Avenue,
Belfast BT2 8HQ
 
BBC Bristol
Broadcasting House,
Whiteladies Road,
Bristol BS8 2LR

BBC Cambridge
Broadcasting House,
104 Hills Road,
Cambridge CB2 1LD

BBC Cardiff
Broadcasting House,
Llandaff,
Cardiff CF5 2YQ

BBC Glasgow
Queen Margaret Drive,
Glasgow  G12 8DG

BBC Leeds
Broadcasting Centre,
Woodhouse Lane,
Leeds LS2 9PX

BBC Manchester
New Broadcasting House,
PO Box 27,
Oxford Road,
Manchester M60 1SJ

BBC Newcastle
Broadcasting Centre,
Barrack Road,
Newcastle upon Tyne  NE99 2NE
<PAGE>
 
                                                                              49

BBC Norwich
St. Catherine's Close,
All Saints' Green,
Norwich,
Norfolk NR1 3ND

BBC Nottingham
Island Business Park,
London Road,
Nottingham [POSTCODE TBA]

BBC Pebble Mill
Broadcasting Centre,
Pebble Mill Road,
Birmingham B5 7QQ

BBC Plymouth
Broadcasting House,
Seymour Road,
Mannamead,
Plymouth PL3 5BD

BBC Southampton
Broadcasting House,
Havelock  Road,
Southampton SO14 7PU

BBC TV Centre
White City
London W12
<PAGE>
 
                                                                              50

                                   SCHEDULE 1
                                   ----------

   PART 4 :  REGIONAL DISTRIBUTION FROM PLAYOUT CENTRES TO TRANSMITTER SITES
   -------------------------------------------------------------------------

                      TABLE 1 :  BDB REGIONAL DISTRIBUTION
                      ------------------------------------

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------
BDB REGION     SIP TRANSMITTER          DEPENDENT TRANSMITTERS                                            
- --------------------------------------------------------------------------------------                   
<S>            <C>                      <C>                                                              
London         Crystal Palace TS        Guildford TS, Reigate TS, Hemel Hempstead TS                     
- --------------------------------------------------------------------------------------
South          Heathfield TS            Hastings TS                                                      
- --------------------------------------------------------------------------------------
Midlands       Beckley TS                                                                                
- --------------------------------------------------------------------------------------
Midlands       Ridge Hill TS                                                                             
- --------------------------------------------------------------------------------------
Midlands       Sutton Coldfield TS      Bromsgrove TS, Larkstoke TS, Brierley Hill TS,
                                        The Wrekin TS, Fenton TS, Malvern TS                             
- --------------------------------------------------------------------------------------
Midlands       Waltham TS               Nottingham TS                                                    
- --------------------------------------------------------------------------------------
N. Ireland     Divis TS                 Limavady TS, Brougher Mt. TS                                     
- --------------------------------------------------------------------------------------
North          Belmont TS                                                                                
- --------------------------------------------------------------------------------------
North          Bilsdale TS                                                                               
- --------------------------------------------------------------------------------------
North          Caldbeck TS                                                                               
- --------------------------------------------------------------------------------------
North          Emley Moor TS            Idle TS, Olivers Mount TS, Keighley TS                           
- --------------------------------------------------------------------------------------
North          Pontop Pike TS           Fenham TS, Chatton TS                                            
- --------------------------------------------------------------------------------------
North          Sheffield TS             Chesterfield TS                                                  
- --------------------------------------------------------------------------------------
North          Winter Hill TS           Saddleworth TS, Storeton TS, Pendle Forest                       
                                        Lancaster TS,                                                                
- --------------------------------------------------------------------------------------
Scotland       Black Hill TS            Craigkelly TS, Torosay TS, Roseneath TS,                         
                                        Darvel TS                                                        
- --------------------------------------------------------------------------------------
Scotland       Durris TS                Eitshall TS, Angus TS, Rosemarkie TS, Rumster                    
                                        Forest TS, Bressay TS, Knocksmore TS,                            
                                        Keelylang TS                                                     
- --------------------------------------------------------------------------------------
North          Selkirk TS                                                                                
- --------------------------------------------------------------------------------------
South          Bluebell Hill TS         Tunbridge Wells TS, Dover TS                                     
- --------------------------------------------------------------------------------------
South          Fremont Point TS                                                                          
- --------------------------------------------------------------------------------------
South          Hannington TS                                                                             
- --------------------------------------------------------------------------------------
South          Mendip TS                Bristol KW TS, Bristol IC TS                                     
- --------------------------------------------------------------------------------------
South          Rowridge TS              Salisbury TS, Midhurst TS, Whitehawk Hill TS                     
- --------------------------------------------------------------------------------------
South          Sandy Heath TS                                                                            
- --------------------------------------------------------------------------------------
South          Stockland Hill TS        Beacon Hill TS                                                   
- --------------------------------------------------------------------------------------
South          Redruth TS                                                                                
- --------------------------------------------------------------------------------------
South          Huntshaw Cross TS                                                                         
- --------------------------------------------------------------------------------------
South          Caradon Hill TS          Plympton TS                                                      
- --------------------------------------------------------------------------------------
South          Tacolneston TS           Sudbury TS                                                       
- --------------------------------------------------------------------------------------
Wales          Wenvoe TS                Presely TS, Llandonna TS, Carmel TS,                             
                                        Blaenplwyf TS, Aberdare TS, Pontypool TS,                        
                                        Moel y Parc TS, Kilvey Hill TS                                    
- --------------------------------------------------------------------------------------
</TABLE>
<PAGE>
 
                                                                              51

                                  SCHEDULE 1
                                  ----------
   PART 4 :  REGIONAL DISTRIBUTION FROM PLAYOUT CENTRES TO TRANSMITTER SITES
   -------------------------------------------------------------------------
                     TABLE 2 :  BBC REGIONAL DISTRIBUTION
                     ------------------------------------

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------- 
BBC SOURCE     SIP TRANSMITTER          DEPENDENT TRANSMITTERS                           
- --------------------------------------------------------------------------------------
<S>            <C>                      <C>                                          
Belfast        Divis TS                 Limavady TS, Brougher Mt. TS                 
- --------------------------------------------------------------------------------------
Birmingham     Ridge Hill TS                                                         
- --------------------------------------------------------------------------------------
Birmingham     Sutton Coldfield TS      Bromsgrove TS, Larkstoke TS, Brierley Hill   
                                        TS, The Wrekin TS, Fenton TS, Malvern TS     
- --------------------------------------------------------------------------------------
Bristol        Mendip TS                Bristol KW TS, Bristol IC TS                 
- --------------------------------------------------------------------------------------
Cambridge      Sandy Heath TS                                                        
- --------------------------------------------------------------------------------------
Cardiff        Wenvoe TS                Presely TS, Llandonna TS, Carmel TS,         
                                        Blaenplwyf TS, Aberdare TS, Pontypool TS,    
                                        Moel y Parc TS, Kilvey Hill TS               
- --------------------------------------------------------------------------------------
Glasgow        Black Hill TS            Craigkelly TS, Torosay TS, Roseneath TS,     
                                        Darvel TS                                    
- --------------------------------------------------------------------------------------
Glasgow        Durris TS                Eitshall TS, Angus TS, Rosemarkie TS,        
                                        Rumster Forest TS, Bressay TS, Knocksmore    
                                        TS, Keelylang Hill TS                        
- --------------------------------------------------------------------------------------
Glasgow        Selkirk TS                                                            
- --------------------------------------------------------------------------------------
Leeds          Belmont TS                                                            
- --------------------------------------------------------------------------------------
Leeds          Emley Moor TS            Idle TS, Olivers Mount TS, Keighley TS       
- --------------------------------------------------------------------------------------
Leeds          Sheffield TS             Chesterfield TS                              
- --------------------------------------------------------------------------------------
Manchester     Winter Hill TS           Saddleworth TS, Storeton TS, Pendle Forest   
                                        TS, Lancaster TS                             
- --------------------------------------------------------------------------------------
Newcastle      Bilsdale TS                                                           
- --------------------------------------------------------------------------------------
Newcastle      Caldbeck TS                                                           
- --------------------------------------------------------------------------------------
Newcastle      Pontop Pike TS           Fenham TS, Chatton TS                        
- --------------------------------------------------------------------------------------
Norwich        Tacolneston TS           Sudbury TS                                   
- --------------------------------------------------------------------------------------
Nottingham     Waltham TS               Nottingham TS                                
- --------------------------------------------------------------------------------------
Plymouth       Fremont Point TS                                                      
- --------------------------------------------------------------------------------------
Plymouth       Stockland Hill TS        Beacon Hill TS                               
- --------------------------------------------------------------------------------------
Plymouth       Plymouth TS                                                           
- --------------------------------------------------------------------------------------
Plymouth       Huntshaw Cross TS                                                     
- --------------------------------------------------------------------------------------
Plymouth       Caradon Hill TS          Plympton TS                                  
- --------------------------------------------------------------------------------------
Southampton    Bluebell Hill TS         Tunbridge Wells TS, Dover TS                 
- --------------------------------------------------------------------------------------
Southampton    Hannington TS                                                         
- --------------------------------------------------------------------------------------
Southampton    Rowridge TS              Salisbury TS, Midhurst TS, Whitehawk Hill TS 
- --------------------------------------------------------------------------------------
TV Centre      Beckley TS                                                            
- --------------------------------------------------------------------------------------
TV Centre      Crystal Palace TS        Guildford TS, Reigate TS, Hemel Hempstead TS                                           
- --------------------------------------------------------------------------------------
TV Centre      Heathfield TS            Hastings TS                                   
- --------------------------------------------------------------------------------------
</TABLE>
<PAGE>
 
                                                                              52

                                  SCHEDULE 1
                                  ----------

                 PART 5 :  TRANSMITTER SITE PROVISIONING PLANS
                 ---------------------------------------------

<TABLE>
<CAPTION>
- -----------------------------------------
TRANSMITTER              FEED A    FEED B
LOCATION                                 
- -----------------------------------------
<S>                      <C>       <C> 
Crystal Palace TS        Fibre     Fibre 
- ----------------------------------------- 
Winter Hill TS           Fibre     Fibre  
- ----------------------------------------- 
Sutton Coldfield TS      Fibre     Fibre  
- ----------------------------------------- 
Emley Moor TS            Fibre     Fibre  
- ----------------------------------------- 
Waltham TS               Fibre     Fibre  
- ----------------------------------------- 
Black Hill TS            Fibre     Fibre  
- ----------------------------------------- 
Sandy Heath TS           Fibre     Fibre  
- ----------------------------------------- 
Pontop Pike TS           Fibre     Fibre  
- ----------------------------------------- 
Bilsdale TS              Fibre     Radio  
- ----------------------------------------- 
Mendip TS                Fibre     Fibre  
- ----------------------------------------- 
Bluebell Hill TS         Fibre     Fibre  
- ----------------------------------------- 
Hannington TS            Fibre     Fibre  
- ----------------------------------------- 
Divis TS                 Fibre     Fibre  
- ----------------------------------------- 
Midhurst TS              Fibre     Radio  
- ----------------------------------------- 
Talconeston TS           Fibre     Fibre  
- ----------------------------------------- 
Beckley TS (Oxford)      Fibre     Fibre  
- ----------------------------------------- 
Wenvoe TS                Fibre     Fibre  
- ----------------------------------------- 
Sudbury TS               Fibre     Fibre  
- ----------------------------------------- 
Craigkelly TS            Fibre     Fibre  
- ----------------------------------------- 
Ridge Hill TS            Fibre     Radio  
- ----------------------------------------- 
Stockland Hill TS        Fibre     Fibre  
- ----------------------------------------- 
Whitehawk Hill TS        Fibre     Fibre  
- ----------------------------------------- 
Sheffield TS             Fibre     Fibre  
- ----------------------------------------- 
Nottingham TS            Fibre     Fibre  
- ----------------------------------------- 
Caradon Hill TS          Fibre     Fibre  
- ----------------------------------------- 
Caldbeck TS              Fibre     Fibre  
- ----------------------------------------- 
Chatton TS               Fibre     Fibre  
- ----------------------------------------- 
Hemel Hempstead TS       Fibre     Fibre  
- ----------------------------------------- 
Kilvey Hill TS           Fibre     Fibre  
- ----------------------------------------- 
Reigate TS               Radio     Radio  
- ----------------------------------------- 
Dover TS                 Fibre     Fibre  
- ----------------------------------------- 
Bristol IC TS            Fibre     Fibre  
- ----------------------------------------- 
Beacon Hill TS           Fibre     Fibre  
- ----------------------------------------- 
Redruth TS               Fibre     Fibre  
- ----------------------------------------- 
</TABLE> 
<PAGE>
 
                                                                              53

<TABLE> 
<S>                      <C>       <C> 
- -----------------------------------------
Limavady TS              Fibre     Radio 
- -----------------------------------------
Chesterfield TS          Fibre     Fibre 
- -----------------------------------------
Bristol KW TS            Fibre     Fibre 
- -----------------------------------------
Tunbridge Wells TS       Fibre     Fibre 
- -----------------------------------------
Pontypool TS             Fibre     Radio 
- -----------------------------------------
Bromsgrove TS            Fibre     Fibre 
- -----------------------------------------
Brougher Mt. TS          Fibre     Radio 
- -----------------------------------------
Salisbury TS             Fibre     Fibre 
- -----------------------------------------
Aberdare TS              Fibre     Fibre 
- -----------------------------------------
Angus TS                 Fibre     Radio 
- -----------------------------------------
Belmont TS               Fibre     Fibre 
- -----------------------------------------
Blaen Plwyf TS           Fibre     Fibre 
- -----------------------------------------
Bressay TS               Radio     Radio 
- -----------------------------------------
Brierly Hill TS          Fibre     Fibre 
- -----------------------------------------
Carmel TS                Fibre     Radio 
- -----------------------------------------
Darvel TS                Fibre     Fibre 
- -----------------------------------------
Durris TS                Fibre     Fibre 
- -----------------------------------------
Eitshall TS              Radio     Radio 
- -----------------------------------------
Fenham TS                Fibre     Fibre 
- -----------------------------------------
Fenton TS                Fibre     Fibre 
- -----------------------------------------
Fremont Point TS         Fibre     Fibre 
- -----------------------------------------
Guildford TS             Fibre     Fibre 
- -----------------------------------------
Hastings TS              Fibre     Fibre 
- -----------------------------------------
Heathfield TS            Fibre     Fibre 
- -----------------------------------------
Huntshaw Cross TS        Fibre     Radio 
- -----------------------------------------
Idle TS                  Fibre     Fibre 
- -----------------------------------------
Keelylang TS             Radio     Radio 
- -----------------------------------------
Keighley TS              Fibre     Fibre 
- -----------------------------------------
Knock more TS            Radio     Radio 
- -----------------------------------------
Lancaster TS             Fibre     Radio 
- -----------------------------------------
Lark stone TS            Fibre     Fibre 
- -----------------------------------------
Llandonna TS             Fibre     Radio 
- -----------------------------------------
Malvern TS               Fibre     Fibre 
- -----------------------------------------
Moel y Parc TS           Fibre     Radio 
- -----------------------------------------
Olivers Mount TS         Fibre     Fibre 
- -----------------------------------------
Pendle Forest TS         Fibre     Fibre 
- -----------------------------------------
Plympton TS              Fibre     Fibre 
- -----------------------------------------
Preseli TS               Fibre     Fibre 
- -----------------------------------------
Rosemarkie TS            Fibre     Radio 
- -----------------------------------------
Rosneath TS              Fibre     Radio 
- -----------------------------------------
Rowridge TS              Fibre     Radio 
- -----------------------------------------
</TABLE> 
<PAGE>
 
                                                                              54

<TABLE> 
<S>                      <C>       <C> 
- -----------------------------------------
Runster Forest TS        Fibre     Radio 
- -----------------------------------------
Saddleworth TS           Fibre     Fibre 
- -----------------------------------------
Selkirk TS               Fibre     Fibre 
- -----------------------------------------
Storeton TS              Fibre     Fibre 
- -----------------------------------------
The Wrekin TS            Fibre     Radio 
- -----------------------------------------
Torosay TS               Radio     Radio  
- -----------------------------------------
</TABLE>
<PAGE>
 
                                                                              55

                                  SCHEDULE 2
                                  ----------

                            CHARGES FOR THE SERVICE
                            -----------------------

1.     CHARGES

1.1    The Charges payable to BT by the Customer will be as follows:

       (a)  a Service Connection Charge for Access Circuits of [*] as at 1998
            prices; and

       (b)  an annual Service Rental Charge  of [*] as at 1998 prices in
            accordance with paragraph 1.2 below.

1.2.1  The Service Rental Charge is calculated in accordance with BT's Price
       List entry for DTTV Distribution Network Service (DTTV) contained in
       Section 19, Part 2 of BT's Price List; and BT's Price List entry for
       Digital Video Broadcasting (DVB) Tariff contained in Section 19, part 2
       of BT's Price List.

1.2.2  The Service Rental Charge is subject to indexation in accordance with
       paragraph 1.3 of this Schedule. The Service Connection Charge is not
       subject to indexation. The Charges are subject to VAT, which will be
       added to the Charges and payable by the Customer. The Charges will not
       otherwise vary during the term of this Contract, unless there is an
       agreed variation in the Customer's requirements.

1.2.3  Service Rental Charges include the following elements:

       a)   Access Circuits (DVB)
            ---------------------

            Charges for this element of the Service cover the conveyance of DVB
            stream(s) from the Customer's premises to the DTTV Distribution
            Network and are calculated in accordance with BT's Price List entry
            for Digital Video Broadcasting (DVB) Tariff contained in Section 19,
            part 2 of BT's Price List.

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              56

            The charge for Access Circuits for the Customer is [*] p.a. at 1998
            prices.

       b)   DTTV Distribution Network Service (DTTV)
            ----------------------------------------

            Applicable Charges consist of:

            (i)   National Distribution Charges covering the conveyance of the
                  Customer's multiplexed DVB transport stream(s) from the
                  regionally associated CNAP and SNAP to the 14 regional CNAPS
                  and SNAPS comprising the National Distribution element of the
                  DTTV network.

                  The charge for this element of the Service is [*] p.a. at 1998
                  prices.

            (ii)  Local Distribution Charges covering the conveyance of the
                  Customer's multiplexed DVB transport stream(s) from the 14
                  regional CNAPS and SNAPS to the relevant Transmitter Sites.

                  The charge for this element of the Service is [*] p.a. at 1998
                  prices, but see NOTE below.

            NOTE: Local Distribution Charges
                  --------------------------

                  During the rollout of Service to the Transmitter Sites Local
                  Distribution Charges will progressively increase in accordance
                  with Service Delivery Dates (subject to 1.4 (b) below) as the
                  Service is provided to more Transmitter Sites, and the Charges
                  shown above in 1.2(b)(ii) will be levied in accordance with
                  the number of Transmitter Sites to which Service is provided.
                  Service to Transmitter Sites will be charged for on

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              57

                  the basis of an average price for distribution to Transmitter
                  Sites, calculated as follows:-
 
                  total Local Distribution Charges  = Y
                  --------------------------------     
                                81

                  Where Y is the Local Distribution Charge per Transmitter Site
                  to which Service is provided. Y is then multiplied by the
                  number of Transmitter Sites to which Service is provided.

1.2.4  Total Service Rental Charges (on the basis that all Service Delivery
       Dates are met by BT) at 1998 prices are therefore as follows:
 
<TABLE> 
<CAPTION> 
       Description                           Year 1  Year 2  Year 3
       -----------                           ------  ------  ------
       onwards
       -------
       <S>                                   <C>     <C>     <C>
 
       Access Charges                          [*]     [*]     [*]
                                                                  
       National Distribution Charges           [*]     [*]     [*]
                                                                  
       Local Distribution Charges              [*]     [*]     [*]
                                                                  
       TOTAL                                   [*]     [*]     [*] 
</TABLE>

       In the event of any changes to the delivery programme, the Local
       Distribution Charges may vary from those indicated in the above
       tabulation, as the Local Distribution Charges are payable (subject to 1.4
       (b) below) from the relevant Service Delivery Dates.

1.3    Charges will be annually increased on each anniversary of the first
       Service Delivery Date in accordance with the following formula:

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              58
 
C1 =   [*]

where:

C1 =   Charges for the current year,

C0 =   Charge for the previous year,

    X =   The arithmetic mean of the percentage increases in the Retail Price
Index for each of the 12 months immediately preceding each anniversary of the
first Service Delivery Date over the Retail Price Index for each of the
corresponding 12 months immediately preceding those 12 months.

       PROVIDED THAT:-

       (a)   in the event that the above formula results in a negative or zero
             figure increase for any period, then there will be no increase for
             that period;

       (b)   in the event that the RPI is not available in time for BT to
             calculate a revised Service Rental Charge on an anniversary of the
             first Service Delivery Date, then BT will invoice the Customer at
             the previous year's Service Rental Charge until the RPI is
             available, when an appropriate adjustment will be made to a
             following invoice;

       (c)   should the RPI cease or fail to be published or should any changes
             occur to the basis of the RPI, BT and the Customer will make a fair
             and reasonable adjustment to RPI or, if appropriate, substitute a
             revised formula which in either event will have substantially the
             same effects as those specified in this paragraph 1.3.

1.4    The terms of payment for the Charges as above will be as follows:-

       (a)   the Service Connection Charge under 1.1(a) above will be payable in
             two equal instalments on the first and second anniversaries of the
             first Service Delivery Date;

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              59

     (b)  The Service Rental Charge under 1.1(b) above will be payable every two
          calendar months in advance, with the first payment being due on the
          first Service Delivery Date, PROVIDED THAT if Service is not provided
          to a Transmitter Site on the relevant Service Delivery Date and the
          delay is due to BT, the Service Rental Charge is payable from the date
          on which Service is provided to that Transmitter Site ("the
          Operational Service Date").

2.   ADDITIONAL TRANSMITTER SITES

     The formula to be used to calculate the Charges for additional transmitter
     site access in accordance with Sub-clause 17.1 (i) will be that the Service
     Rental Charges for Service to the additional transmitter sites will be
     based on the Service Rental Charges as described in paragraph 1 above, but
     subject to a maximum annual charge of [*] at 1998 prices (plus value added
     tax) per annum per site, such maximum figure being subject to annual
     indexation in accordance with paragraph 1.3 above from the first
     anniversary of the first Service Delivery Date to the time the Service is
     provided to the additional transmitter site(s), provided that such maximum
     annual charge will only apply to up to an aggregate maximum of 24
     additional transmitter sites nominated by the Customer, and where all such
     sites and circuits to them are within BT's Licensed area in the United
     Kingdom.  The additional Service Rental Charges for Service being provided
     to such additional transmitter sites will be subject to annual increase in
     accordance with paragraph 1.3 above. The annual charge referred to above
     will be apportioned per DTTV Multiplex Service (currently 5) according to
     any shared utilisation with other customers for the DTTV Service.

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              60

                                  SCHEDULE 3
                                  ----------

                     LATE DELIVERY PAYMENTS AND ABATEMENTS
                     -------------------------------------

INDEX
- -----

Part 1:       Late Delivery Payments
Part 2:       Loss of Service Definition
Part 3:       Abatements
<PAGE>
 
                                                                              61

                                  SCHEDULE 3
                                  ----------

                       PART 1: LATE DELIVERY PAYMENTS
                       ------------------------------

1.   GENERAL

     In the event of delivery of Preliminary Testing Service after the Service
     Preliminary Testing Dates, of delivery of Full Testing Service after the
     Service Full Testing Dates, and/or of delivery of full Service after the
     Service Delivery Dates, where the delay is due to BT, the Customer will be
     entitled to claim Late Delivery Payments from BT calculated and payable in
     accordance with this Part 1 of Schedule 3.

     BT will, wherever practicable, co-ordinate its activities with the
     transmitter providers' build project timetables and to this intent will use
     reasonable endeavours to provide relevant Service to the Phase 1
     Transmitter Sites (as defined below), subject to requirements in Clauses 4
     and 6 being met within appropriate earlier timescales, one month prior to
     relevant Dates, but will not be liable for Late Delivery Payments (or at
     all) in the event of any such Service not being available on any such Date.

2.   LATE DELIVERY PAYMENTS FOR LATE DELIVERY OF PRELIMINARY TESTING SERVICE AND
     FULL TESTING SERVICE TO PHASE 1 TRANSMITTER SITES

2.1  Where Preliminary Testing Service is not made available to all of the
     Transmitter Sites listed under the heading Phase 1 in Part 2 of Schedule 1
     (the "Phase 1 Transmitter Sites") by midnight on their common Service
     Preliminary Testing Date, and/or where Full Testing Service is not made
     available to all of the Phase 1 Transmitter Sites by midnight on their
     common Service Full Testing Date, where the delay is due to BT in each
     case, Late Delivery Payments will be calculated as follows:-
<PAGE>
 
                                                                              62

2.2  For Preliminary Testing Service, Late Delivery Payments will be based on
     Table 1A below. The amount payable will be a single payment, being the
     figure shown opposite the Day on which Preliminary Testing Service is
     provided to all the Phase 1 Transmitter Sites, multiplied by the number of
     DTTV Multiplex Services for which the Customer (or, where appropriate, the
     Customer's own customer DTTV Multiplex Service providers) have Broadcasting
     Authority licences (not exceeding 4) and which are affected by the delay
     ("the Multiplier"). Where Preliminary Testing Service is not provided to
     all the Phase 1 Transmitter Sites until after Day 30, the amount payable
     will be the amount shown opposite Day 30, multiplied by the Multiplier.

2.3  For Full Testing Service, Late Delivery Payments will be based on Table 1B
     below. The amount payable will be a single payment, being the figure shown
     opposite the Day on which Full Testing Service is provided to all the Phase
     1 Transmitter Sites, multiplied by the Multiplier. Where Full Testing
     Service is not provided to all the Phase 1 Transmitter Sites until after
     Day 30, the amount payable will be the amount shown opposite Day 30,
     multiplied by the Multiplier.

2.4  If the Customer claims Late Delivery Payments under paragraphs 2.1 to 2.3
     above, the Customer will not be entitled to receive the relevant Service to
     any of the Phase 1 Transmitter Sites. However, if the Customer wishes to
     accept provision of the relevant Service to some, but not all, of the Phase
     1 Transmitter Sites on the relevant Date, then the Customer will be
     entitled to claim Late Delivery Payments of a pro-rata proportion of the
     relevant sum shown in Table 1A or B (as appropriate), where the amount
     payable will be calculated as follows:-
<PAGE>
 
                                                                              63

     Number of Phase 1              Figure shown
     Transmitter Sites in           opposite Day
     respect of which               on which relevant
     relevant Service is            Service is
     not available                  provided to all
     _________________        X     Phase 1        X    Multiplier
     Total number of                Transmitter
     Phase 1 Transmitter            Sites (or if after
     Sites                          Day 30, then figure
                                    shown opposite
                                    Day 30)

2.5  Any Phase 1 Transmitter Sites for which a Service Preliminary Testing Date
     and/or a Service Full Testing Date are either not agreed, or are not common
     to the Service Preliminary Testing Date or the Service Full Testing Date
     for the other Phase 1 Transmitter Sites, will be deemed to be Phase 2
     Transmitter Sites (see below) and accordingly Late Delivery Payments under
     this paragraph 2 and the following paragraph 3 will not be payable in
     respect of delivery of relevant Service to such Transmitter Sites.

3.   LATE DELIVERY PAYMENTS FOR LATE DELIVERY OF FULL SERVICE TO PHASE 1
     TRANSMITTER SITES

     In addition to any Late Delivery Payments payable under paragraph 2 above,
     for each of the Phase 1 Transmitter Sites where full Service is not
     provided by midnight on their common Service Delivery Date where the delay
     is due to BT, the Customer will be entitled to claim a further Late
     Delivery Payment which will be [*] per Transmitter Site per day of such
     delay multiplied by the Multiplier, subject to a maximum overall total
     daily payment for all such Transmitter Sites of [*] multiplied by the
     Multiplier.

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              64

4.   LATE DELIVERY PAYMENTS FOR LATE DELIVERY OF PRELIMINARY TESTING SERVICE,
     FULL TESTING SERVICE, AND FULL SERVICE TO PHASE 2 TRANSMITTER SITES

     In respect of the Transmitter Sites listed under the heading Phase 2 in
     Part 1 of Schedule 1 or deemed to be a Phase 2 Transmitter Site under
     paragraph 2.5 above (the "Phase 2 Transmitter Sites"), the Customer will be
     entitled to claim Late Delivery Payments in accordance with either Option A
     or Option B as set out below, provided that the Customer elects which
     Option will apply prior to signature of this Contract:-

     OPTION A
     --------

     The Customer will be entitled to claim Late Delivery Payments for late
     delivery of Preliminary Testing Service and Full Testing Service on the
     same basis as set out in paragraph 2 of this Part 1 of Schedule 3, but
     where the provisions of paragraph 2 will apply separately to each group of
     Phase 2 Transmitter Sites which share the same Dates, and in the case of
     each such group, the amounts shown in Table 1A and Table 1B are each
     reduced by four-fifths. Additionally, where full Service is not provided to
     any Phase 2 Transmitter Site by midnight on its Service Delivery Date where
     the delay is due to BT, the Customer will be entitled to claim a Late
     Delivery Payment of [*] per day of such delay multiplied by the Multiplier.

     OPTION B
     --------

     No Late Delivery Payments will be payable where Preliminary Testing Service
     is not delivered on the Service Preliminary Testing Date, or where Full
     Testing Service is not delivered on the Service Full Testing Date, but
     where full Service is not provided to any Phase 2 Transmitter Site by
     midnight on its Service Delivery Date where the delay is due to BT, the
     Customer will be entitled to claim a Late Delivery Payment of [*] per day
     of such delay multiplied by the Multiplier.

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              65

     CUSTOMER'S ELECTION
     -------------------

     The Customer elects Option A

5.   MAXIMUM OVERALL TOTAL OF LATE DELIVERY PAYMENTS

     All Late Delivery Payments will be subject to a maximum overall annual
     total, commencing on the first Service Preliminary Testing Date and
     expiring on the last Operational Service Date, of one half of the total
     Service Rental Charge for Year 3 as set out in paragraph 1.2.4 of Schedule
     2 (or pro rata for the last year).
 
6.   GENERAL SCOPE AND LIMITATIONS OF LATE DELIVERY PAYMENTS

6.1  Late Delivery Payments will be in full and final satisfaction of any claims
     against BT by the Customer relating to delay in provision of the relevant
     Service and BT will not be liable to the Customer for any failure to
     provide the relevant Service by any dates specified in this Contract save
     to the extent set out in this Part 1 of Schedule 3.

6.2  Late Delivery Payments will not be payable:-

     (a)  Where Preliminary Testing Service, Full Testing Service, or full
          Service is not available on the relevant date due to the BT's
          requirements under Clauses 4 or 6 not being met, or an event described
          in Sub-clause 4.4, or to delays in obtaining wayleave consents, or to
          any event falling within Clause 13, or any other cause not due to BT;
          or

     (b)  In relation to Late Delivery Payments for Preliminary Testing Service
          and/or Full Testing Service, to the extent that the Customer does not
          incur costs as a consequence of the delay.
<PAGE>
 
                                                                              66


7.   PAYMENT OF LATE DELIVERY PAYMENTS

     Late Delivery Payments will be calculated monthly in arrears and payable
     within 45 days of the date of the invoice from the Customer. The Customer
     may charge daily interest on late payments at a rate equal to 4% per annum
     above the base lending rate of Midland Bank plc.
<PAGE>
 
                                                                              67


                                    TABLE 1
                                    -------


                         LATE DELIVERY PAYMENT FORMULA

                         FOR PHASE 1 TRANSMITTER SITES

<TABLE>
<CAPTION>
TABLE 1A                             TABLE 1B                       
PRELIMINARY TESTING                  FULL TESTING                   
SERVICE                              SERVICE                        
========================             ==========================  
   DAY      AMOUNT                      DAY         AMOUNT      
- -----------------------              --------------------------
<S>         <C>                      <C>            <C>                   
     1         [*]                        1            [*] 
     2         [*]                        2            [*] 
     3         [*]                        3            [*] 
     4         [*]                        4            [*] 
     5         [*]                        5            [*] 
     6         [*]                        6            [*] 
     7         [*]                        7            [*] 
     8         [*]                        8            [*] 
     9         [*]                        9            [*] 
    10         [*]                       10            [*] 
    11         [*]                       11            [*] 
    12         [*]                       12            [*] 
    13         [*]                       13            [*] 
    14         [*]                       14            [*] 
    15         [*]                       15            [*] 
    16         [*]                       16            [*] 
    17         [*]                       17            [*] 
    18         [*]                       18            [*] 
    19         [*]                       19            [*] 
    20         [*]                       20            [*] 
    21         [*]                       21            [*] 
    22         [*]                       22            [*] 
    23         [*]                       23            [*] 
    24         [*]                       24            [*] 
    25         [*]                       25            [*] 
    26         [*]                       26            [*] 
    27         [*]                       27            [*] 
    28         [*]                       28            [*] 
    29         [*]                       29            [*] 
    30         [*]                       30            [*] 
========================             ==========================  
</TABLE> 

Where  each Day commences            Where each Day commences
at 00.01 hours and ends              at 00.01 hours and ends
at 24.00 hours, and Day 1            at 24.00 hours, and Day 1
is the day after the Service         is the day after the Service
Preliminary Testing Date, et seq.    Full Testing Date, et seq.

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              68

                                  SCHEDULE 3
                                  ----------

                      PART 2: LOSS OF SERVICE DEFINITION
                      ----------------------------------
                                        
1.   The network is designed to achieve an overall end-to-end network
     availability between each Distribution Input Interface pair of Customer's
     Content Signals and each associated Distribution Output Interface pair of
     Customer's Content Signals of not less than 99.99% over a rolling 6 month
     period.

2.   Loss of Service will be considered to have happened when both feeds of
     Customer's Content Signals to a Transmitter Site have been declared as
     unavailable simultaneously, or a feed is declared unavailable within 1
     (one) minute of the other feed being declared available (after the other
     feed had previously been declared unavailable). In the first case the Loss
     of Service will be credited for Abatements purposes in complete seconds
     until one of the feeds is declared available. In the second case a Loss of
     Service of 1 (one) minute minus the time in complete seconds during which
     both links were available will be credited for Abatements purposes.

3.   A feed to a Transmitter Site will be deemed to be unavailable whenever one
     of the following conditions is satisfied (these conditions being based on
     ETSI Technical Recommendation ETR 290 (May 1997), Title: Digital Video
     Broadcasting (DVB) Measurement Guidelines for DVB Systems, Ref: DTR/JTC -
     00DVB - 22):-

     (a)  [*] or
 
     (b)  [*] or
          
     (c)  [*] or

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              69

     (d)  [*] or

     (e)  [*] or

     (f)  [*] or

     PROVIDED THAT where more than one of the above events occur simultaneously
     or overlap, only one of such events, in the order of precedence listed
     above, will give rise to Abatements.

4.   Feeds will be deemed available (after they have previously been declared
     unavailable) when the following conditions apply. Each clear condition is
     associated with the fault condition above:-
 
     (a)  [*] or

     (b)  [*] or

     (c)  [*] or

     (d)  [*] or
 
     (e)  [*] or

     (f)  [*]

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              70

                                  SCHEDULE 3
                                  ----------

                             PART 3:  ABATEMENTS
                             --------------------

1.   GENERAL

     If Loss of Service occurs after the first Operational Service Date which is
     due to BT, then the Customer will be entitled to claim an Abatement of the
     Service Rental Charge in accordance with this Part 3 of Schedule 3.  For
     the purposes of Abatements, Loss of Service will be calculated over a
     rolling 365 day period.

2.   ABATEMENTS FOR LOSS OF SERVICE

     Should a Loss of Service to any of the Transmitter Sites occur after its
     Operational Service Date then subject to paragraphs 3 and 4 below, the
     Customer will be entitled to claim an Abatement of the Service Rental
     Charge in accordance with the formula set out in Table 1 below. The maximum
     Abatement of Service Rental Charge to apply to a Loss of Service to any
     Transmitter Site in any consecutive period of one year commencing on the
     first Operational Service Date for the remainder of the term of this
     Contract (or part year for the last such period), will be as set out in
     Table 1 below (or a proportionate part of such maximum for the last such
     period).

3.   MAXIMUM OVERALL ANNUAL TOTAL OF ABATEMENTS
 
     Abatements will be subject to a maximum overall annual total, commencing on
     the first Operational Service Date and expiring on the last day of the
     Contract, of one half of the total Service Rental Charge for Year 3 as set
     out in paragraph 1.2.4 of Schedule 2 and as increased in accordance with
     the formula set out in paragraph 1.3 of Schedule 2 at the date of
     calculation (or pro rata for the last year).
<PAGE>
 
                                                                              71

4.   GENERAL SCOPE AND LIMITATIONS OF ABATEMENTS

4.1  Payment or credit of Abatements will be in full and final satisfaction of
     any claims against BT by the Customer relating to the quality of the
     Service and BT will not be liable to the Customer for any faults, Loss of
     Service or other failures in the quality of the Service save to the extent
     set out in this Part 3 of Schedule 3

4.2  No Abatement of the Service Rental Charge for Loss of Service to any
     Transmitter Site will apply if such Loss of Service is due to any one of
     the following circumstances:-

     (a)  where the failure is due to any matter covered by Clause 13; or

     (b)  interruption, withdrawal or suspension of the Service in accordance
          with Sub-clause 2.6, 7.5 or 16.2, or to carry out planned upgrades to
          the Service at agreed times (including installation of output
          switching); or

     (c)  failure by the Customer to comply with its obligations under this
          Contract, including but not limited to those under Clauses 5 or 7; or

     (d)  BT's requirements under Clauses 4 or 6 not being met, or an event
          occurring as described in Sub-clause 4.4; or

     (e)  a failure or fault not attributable to the Service, including but not
          limited to faults attributable to the Customer's Equipment, or other
          networks or services connected to the Service, or other circumstances
          under the Customer's control; or

     (f)  the Loss is due to the Customer's Content Signals being absent or
          degraded or incorrectly routed prior to the Distribution Input
          Interface.
<PAGE>
 
                                                                              72

5.   PAYMENT OF ABATEMENTS

5.1  Within 10 working days following any period of Loss of Service, BT will
     forward to the Customer a consolidated report of any Loss of Service to the
     Transmitter Sites specifying the dates, times and durations of any such
     Loss of Service and specifying any applicable Abatement as determined by,
     and meeting the conditions outlined in this Part 3 of Schedule 3, which the
     Customer will be entitled to claim.

5.2  Unless otherwise agreed with the Customer, Abatements claimed by the
     Customer will be set off against the next instalment(s) of the Service
     Rental Charge, except for any Abatements claimed after the final instalment
     has been paid, where BT will pay any Abatements claimed within 45 days of
     the date of the invoice from the Customer. The Customer may charge daily
     interest on late payment of such invoice at a rate equal to 4% per annum
     above the base lending rate of Midland Bank plc.
<PAGE>
 
                                                                              73

                                    TABLE 1
                                    -------

                               ABATEMENT FORMULAE
                               ------------------
                                        

Abatements for Category A Transmitter Sites (One only, being Crystal Palace
- ---------------------------------------------------------------------------
Transmitter Site)
- -----------------

- ---------------------------------------------------------------------
Total loss of service in any       Annual derived abatement of Annual
365 day period.                    Rental charge (per Station)

T= 0 to 30 secs                    [*]
T= 30 secs to 240 mins             [*]
T= above 240 mins                  [*]
- ---------------------------------------------------------------------

Where X(T) = [*]
ln is natural logarithm.
T is the cumulative Loss of Service in minutes rounded to the nearest whole
minute.

Abatements for Category B Transmitter Sites (All Transmitter Sites other than
- -----------------------------------------------------------------------------
Crystal Palace Transmitter Site)
- --------------------------------

- ---------------------------------------------------------------------
Total loss of service in any       Annual derived abatement of Annual
365 day period.                    Rental charge (per Station)


T= 0 to 30 secs                    [*]
T= 30 secs to 240 mins             [*]
T= above 240 mins                  [*]
'''''''''''''
- ---------------------------------------------------------------------

Where X(T) = [*]
ln is natural logarithm.
T is the cumulative Loss of Service in minutes rounded to the nearest whole
minute.
NOTE:  These formulae will apply on a per Transmitter Site basis

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              74

                                   SCHEDULE 4
                                   ----------

                        FUNCTIONAL DESIGN SPECIFICATION
                        -------------------------------
                                        
The Functional Design Specification is a detailed technical description of the
Service, of which the current version is:-

"An Integrated Distribution Network for Digital Terrestrial Television
Functional Design Specification
for Castle Transmission International
Issue: Draft 0.2"

It does not form part of the Contract, but may be used by the parties for
reference and clarification purposes.  In the event of any conflict between the
Functional Design Specification and the Contract, the Contract will prevail.

The parties recognise that the technical description and specification of the
Service may change from time to time, and that any such agreed changes will be
incorporated within a revised Functional Design Specification, in addition to
any changes that may be agreed to the Contract consequent on such changes.
<PAGE>
 
                                                                              75

                                   SCHEDULE 5
                                   ----------

                              IMPLEMENTATION PLAN
                              -------------------
                                        
BT will produce an Implementation Plan for delivery and testing of the Service,
which will include timescales for fulfilment of BT and Customer requirements and
obligations (including the BT requirements and Customer's obligations under Sub-
clauses 4.1 and 6.1), and which both parties will use all reasonable efforts to
agree as soon as practicable, PROVIDED THAT in any event the Customer
acknowledges that, as a minimum:-

(a)  BT will require the requirements described in Sub-clause 4.1 to be
     fulfilled not less than two calendar months prior to the relevant Service
     Preliminary Testing Date at each Site; and

(b)  BT will require the following minimum levels of access referred to in Sub-
     clause 6.1:-

     (i)   continuous 24-hour access to all relevant Sites for all internal work
           during a period from 2 months prior to each Service Preliminary
           Testing Date to each Service Delivery Date;

     (ii)  access 7 days per week from 08.00 hours to 18.00 hours to all
           relevant Sites for all external work during a period from 3 months
           prior to each Service Preliminary Testing Date to 1 month prior to
           each Service Preliminary Testing Date, then continuous 24-hour access
           to all relevant Sites for all external work during a period from 1
           month prior to each Service Preliminary Testing Date to each Service
           Delivery Date.

If the Customer is unable to arrange access in accordance with (b) above at any
Transmitter Sites, the Customer may propose an alternative detailed timetable
(including proposed dates and hours of access for internal and external work)
for BT's access to such Transmitter Sites. BT will review these proposals and
indicate whether or not BT can accept them (which will be at BT's sole
discretion) in relation to each Transmitter
<PAGE>
 
                                                                              76

Site.  Where BT accepts such proposals, BT's requirements under Sub-clause 6.1
shall be deemed to be modified accordingly in relation to such Transmitter
Site(s), and Late Delivery Payments shall apply accordingly.  Where BT does not
accept such proposals, BT will use reasonable endeavours to carry out the
relevant work within the Customer's proposed timetable but will have no
liability to the Customer for late provision of Service and accordingly no Late
Delivery Payments will be payable.  BT's acceptance of any such proposals will
only be valid if made in writing and signed by BT's DTTV Service Project
Manager, such BT DTTV Service Project Manager to be advised by BT to the
Customer from time to time.
<PAGE>
 
                                                                              77

                                   SCHEDULE 6
                                   ----------

                                ACCEPTANCE TESTS
                                ----------------

                         PART 1 :  GENERAL METHODOLOGY
                         -----------------------------

     BT will conduct Acceptance Tests in accordance with the following
     methodology to satisfy conformance with the Acceptance Criteria. These
     tests will take place in four main stages:-

     (a)  the Customer will have the built in diagnostic features of the ASI
          equipment demonstrated to them at BT laboratories. These features will
          enable remote verification that the DTTV Distribution Network is
          satisfying the service parameters during commissioning and through out
          the life of the network;

     (b)  individual links will be commissioned by BT. Copies of the
          commissioning reports for each circuit within the network on which
          their signals are carried will be made available to the Customer;

     (c)  the Customer's nominated representatives, in accordance with Sub-
          clause 3.1, will be invited to be present at a five randomly picked
          Transmitter Sites where the diagnostic features of the ASI equipment
          will again be verified with other test equipment. At this time the
          Customer will also verify that the network monitoring system is
          reporting as expected;

     (d)  the DTTV Distribution Network will then be finally commissioned, using
          the diagnostic features of the ASI mux and the network monitoring
          system, ensuring that the Service meets the Acceptance Criteria.

2.   The Acceptance Tests for the Preliminary Testing Service, the Full Testing
     Service, and fully operational Service will be as follows:-
<PAGE>
 
                                                                              78

     (a)  following the installation of a single link for the Preliminary
          Testing Service, BT will verify the link performance between the
          Playout Centre and the Transmitter Site.  Acceptance Testing for the
          Preliminary Testing Service will consist of a link performance check
          which will be limited to a verification that the ASI performance is
          error-free and formatted in accordance with DVB-PI-154 TM1449:
          Interfaces for CATV/SATV Headends and Similar Professional Equipment
          (EN 50083-9) (the "Specification");

     (b)  following the installation of the second link, BT will verify the link
          performance between the Playout Centre and the Transmitter Site.  A
          link performance check will be limited to a verification that the ASI
          performance is error-free and formatted in accordance with the
          Specification. If these conditions are met, both links will then be
          subject to longer duration stability testing, where the diagnostic
          features of the ASI Mux will be used in conjunction with the network
          monitoring system to demonstrate that [*]. Should errors occur during
          link testing then the stability check will be restarted until a [*].
          These results will be presented to the Customer as demonstration that
          the results of the Acceptance Tests for the Full Testing Service and
          the fully operational Service meet the Acceptance Criteria.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.

<PAGE>
 
                                                                              79

                                   SCHEDULE 6
                                   ----------

                         PART 2:  ACCEPTANCE CRITERIA
                         ----------------------------
                                        
     For the Preliminary Testing Service, the Acceptance Criteria will be that
     the ASI stream is error-free and formatted in accordance with the
     Specification as defined in paragraph 2, Part 1, Schedule 6, measured as
     described in paragraph 2, Part 1, Schedule 6.

     For the Full Testing Service, and the fully operational Service, the
     Acceptance Criteria will be that there are no transport stream errors
     introduced by the distribution system recorded by the Network Management
     Service for a continuous period of [*], measured as described in
     paragraph 2, Part 1, Schedule 6.

               Please see paragraph 3, Part 1, Schedule 1 for description of the
     respective facilities comprising the Preliminary Testing Service, the Full
     Testing Service and fully operational Service.

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              80

                                  SCHEDULE 7
                                  ----------  

                          NETWORK MANAGEMENT SERVICE 
                          --------------------------

1.   NETWORK MANAGEMENT

1.1  Network Management facilities will be provided to coincide with Service
     Full Testing Dates.  Network Management provides the framework within which
     the Service will be managed.  A more detailed description of the facilities
     that will be provided by BT and the features and functionality is contained
     in the Functional Design Specification.

1.2  Network technical performance information will be made available to the
     Customer, and any network  failures will be reported to the status display
     and statistics will be maintained and be available at the status display.
     This status display will provide a continuous overview of the network and
     the status of the signals.  If a Loss of Service occurs, alarms will appear
     on the status display.  The displays will also provide facilities to
     ascertain the reason for the alarm(s) and to store the cumulative Service
     statistics for a rolling 12 month period.

1.3  Network reports will be available as described in the Functional Design
     Specification.

2.   FAULT REPORTING

     The BT Service Management Centre (SMC) will manage the Service.  The SMC
     will monitor the Service 24 hours/day, 365 days/year and will provide a
     reporting service to the Customer for incidents on the Service.  If a Loss
     of Service occurs the Customer can contact BT at the SMC on the following
     numbers:-

          The telephone number for the SMC is: 0800 212857
          The facsimile number for the SMC is: 0(1)71 261 4279
<PAGE>
 
                                                                              81

                                  SCHEDULE 8
                                  ----------

                   SPECIFICATION OF CUSTOMER CONTENT SIGNALS
                   -----------------------------------------
                                        
1.   The Customer will provide in respect of each DTTV Multiplex Service, two
     outputs of Customer's Content Signals to be carried over the DTTV
     Distribution Network from each Playout Centre. Each output of Customer's
     Content Signals will be identical and (subject to Sub-clause 4.2)
     continuous under normal conditions, and will have a nominal bitrate of [*]
     . Customer's Content Signals must comply with the characteristics described
     in paragraph 4.1, Part 1, Schedule 1.

2.   Customer interfaces to the network will be provided in accordance with
     paragraph 4, Part 1, Schedule 1.

[*] Indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been filed with the Securities and Exchange
    Commission separately.
<PAGE>
 
                                                                              82

                                  SCHEDULE 9
                                  ----------

             PERSONS PERMITTED TO RECEIVE CONFIDENTIAL INFORMATION
             -----------------------------------------------------

1.   BOTH PARTIES

     Their employees or professional advisers who need to know the information

2.   ADDITIONALLY FOR BT

     The employees of a BT Group Company who need to know the information BT's
     suppliers who need to know the information

3.   ADDITIONALLY FOR THE CUSTOMER

     The employees of the following who need to know the information:-

          British Digital Broadcasting Plc   
          The British Broadcasting Corporation
          Any Group Company of the Customer  
          The Customer's suppliers
<PAGE>
 
                                                                              83

                                  SCHEDULE 10
                                  -----------

                          CONTRACT CHANGE ORDER FORM
                          --------------------------


________________________________________________________________________________

CHANGE ORDER NUMBER:          DATE:
- --------------------          -----


The Contract dated ...................................Reference
- ---------------------------------------------------------------
Number.........................................
- -----------------------------------------------
between British Telecommunications plc of 81, Newgate Street, London, EC1A 7AJ
- ------------------------------------------------------------------------------
(hereinafter called "BT")
- -------------------------

and (Customer)
- --------------

for the supply of :- DTTV Service
- ---------------------------------

is amended as follows:-
- -----------------------

________________________________________________________________________________
1.   DESCRIPTION
________________________________________________________________________________

________________________________________________________________________________
2.   AMENDMENT TO CLAUSE
     -------------------

________________________________________________________________________________
3.   ORIGIN AND REASON FOR CHANGE ORDER
     ----------------------------------

________________________________________________________________________________
<PAGE>
 
                                                                              84

________________________________________________________________________________
4.   CHARGES
     -------

     I)  THE TOTAL CHANGE IN THE CHARGES FOR CARRYING OUT THE AMENDMENT IN
     ACCORDANCE WITH THE TERMS OF THIS CHANGE ORDER IS:

     II) THE CHARGES ARE AMENDED TO:-

________________________________________________________________________________

5.   COMMENCEMENT DATE
     -----------------

     The Commencement Date is amended to:-

________________________________________________________________________________
6.   REMARKS
     -------

________________________________________________________________________________
7.   GENERAL
     -------

     Except as amended herein or by any other formal Contract Change Orders duly
     signed by xx and BT, the terms of the Contract dated..................
     Reference Number.................. will remain in full force and effect.

     The terms of this Contract Change Order are agreed.

________________________________________________________________________________
8.   PREVIOUS CONTRACT CHANGE ORDERS
     -------------------------------

     Number              Date
     ------              ----

________________________________________________________________________________
<PAGE>
 
                                                                              85

     SIGNED BY                      )
     ---------                       
     a duly authorised person on    )
     behalf of                      )
     British Telecommunications plc )

                              Name  )
                           Position )



     SIGNED BY                      )
     ---------                       
     a duly authorised person on    )
     behalf of xxxx plc
                              Name  )
                           Position )
 

<PAGE>

                                                                   EXHIBIT 10.38

                           SITE MARKETING AGREEMENT
                           ------------------------


     THIS AGREEMENT, made this 25th day of June, 1998, between BELLSOUTH
MOBILITY INC, Georgia corporation with its principal office located at 1100
Peachtree Street, N.E., Suite 1000, Atlanta, Georgia 30309, hereinafter
designated "BellSouth" and CROWN COMMUNICATION INC., D/B/A CROWN COMMUNICATIONS,
a Delaware corporation with its principal offices located at Southpointe, 375
Southpointe Boulevard, Canonsburg, Pennsylvania 15317, hereinafter designated
"Crown".

                                  WITNESSETH:

     WHEREAS, BellSouth, through various related entities operates a wireless
communications network in the states of Indiana, Kentucky, Tennessee,
Mississippi, Alabama, Georgia, Florida and Louisiana which is comprised in part
of cellular communications tower sites as to which BellSouth owns the fee or has
a ground lease (or a license or easement similar in effect to a ground lease),
which cellular tower sites include structures such as freestanding towers, guyed
towers and monopoles, hereinafter referred to as "Tower Sites" (the term "Tower
Sites" shall exclude buildings, equipment shelters, huts, or sheds and space
occupied by BellSouth at the Tower Sites);

     WHEREAS, Crown is in the business of managing, developing, constructing,
maintaining, marketing and operating networks of communications tower
facilities, including the management of wireless communications sites and
networks owned by third party providers of wireless communications services;

     WHEREAS, BellSouth desires to optimize the utilization and value of its
Tower Sites by leasing space at the Tower Sites for the co-location of
communications equipment for any type of wireless and broadcast communications
services;

     WHEREAS, BellSouth and Crown intend to engage in additional negotiations to
explore the formation of a more permanent entity to serve their mutual interests
with regard to the ownership, management and utilization of the Tower Sites; and

     WHEREAS, BellSouth and Crown are desirous of establishing terms and
conditions which will apply to the marketing of the Tower Sites by Crown
initially in the State of Kentucky.

     NOW, THEREFORE, in consideration of the mutual covenants hereinafter set
forth, and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, BellSouth and Crown agree as follows:
<PAGE>
 
1.   SITE MARKETING AGREEMENT
     ------------------------

     1.1  MARKETING SITES.
          --------------- 

     (a)  BellSouth hereby agrees that Crown shall serve as BellSouth's
exclusive marketing agent of the Tower Sites in the state(s) listed on Exhibit
"A" hereto (the "Territory") for the purpose of leasing, subleasing or licensing
certain spaces for wireless communications antennas and related space for
equipment sheds at the Tower Sites which now exist or may exist or may exist in
the future in the Territory and as BellSouth's agent for collecting rent on the
terms and conditions hereinafter set forth. The parties by mutual agreement may
add other states to the Territory by appropriately amending Exhibit "A" hereto.

     (b)  BellSouth retains the right as principal to lease tower space at the
Tower Sites in the Territory for its own account.  Without limitation of this
right, BellSouth does not presently anticipate exercising this right except as
necessary to obtain space on a reciprocal basis with owners of other towers.

     (c)  Crown's rights as exclusive marketing agent shall also be subject to
existing agreements between BellSouth and third party providers of wireless
communications services, all of which are identified in Exhibit "A" attached
hereto, and to future agreements which BellSouth may identify to Crown and which
when so identified shall be deemed listed on Exhibit "A" attached hereto.  These
future agreements shall be additional co-location agreements on terms  and
conditions substantially similar to the terms of the co-location agreements
listed on Exhibit "A", and agreements relating to Tower Sites resulting from
build-to-suit agreements with persons other than Crown, particularly Tower Sites
where BellSouth has a ground lease (or a license or easement similar in effect
to a ground lease).

     (d)  As consideration for the execution of this Agreement and for serving
as exclusive marketing agent of the Tower Sites, Crown agrees to actively market
available space for wireless communications antennas and related space for
equipment sheds at the Tower Sites, on the same basis as Crown markets Crown's
owned wireless communications tower facilities, in order to lease, sublease or
license such available space at the Tower Sites to third party providers or
users of wireless communications services.

     (e)  As exclusive marketing agent of the Tower Sites in the Territory,
Crown shall provide all sales and marketing functions, along with the receipt of
all third party payments as set forth in Section 5 below.

     (f)  As consideration for Crown's being designated as the exclusive
marketing agent of the Tower Sites in the Territory, Crown agrees that during
the term of this Agreement, Crown and Crown's subsidiaries, affiliates and
assigns shall not market, within the states encompassed by this Agreement, any
wireless communications tower sites unless such tower sites are owned or
developed by Crown or Crown's subsidiaries, affiliates or assigns; provided
however that any such tower sites developed by Crown (or its subsidiaries,
affiliates or assigns) after the date hereof in the State or States listed on
Exhibit "A" hereto shall be designed so as not to compete

                                       2
<PAGE>
 
with BellSouth's then existing Tower Sites. For purposes of this Agreement,
the term "affiliate" shall be defined as any person which controls the named
party, is controlled by the named party or is under common control with the
named party.

     1.2  INFORMATION TO MARKET SITES.  In order to assist Crown in its efforts
          ---------------------------                                          
to actively market BellSouth's Tower Sites, BellSouth agrees to furnish to
Crown, within ten (10) business days of the date first written above, at no cost
to Crown, all information regarding the Tower Sites which has been compiled by
BellSouth and is located at its offices at 1100 Peachtree Street, N.E., Atlanta,
Georgia 30367 as of the date of this Agreement and to continue to furnish all
such future information to Crown as it becomes available at said location.
BellSouth shall not be required to request information from its offices in the
field unless it elects to do so in its sole discretion.  Such information shall,
if available, include but not be limited to Prime Leases (as defined below),
construction drawings of compound and antenna support structures, surveys,
environmental assessments, mechanical drawings (power, telco, HVAC, grounding,
etc.), soils investigations and reports, permits and approvals.


2.  MASTER LEASE AGREEMENT
    ----------------------

     2.1  MASTER LEASE.  Simultaneously with the execution of this Agreement,
          ------------                                                       
BellSouth and Crown shall enter into the Master Lease Agreement attached hereto
as Exhibit "B".  This Master Lease Agreement contains the terms and conditions
upon which spaces for wireless communications antennas and related space for
equipment sheds at a Tower Site will be leased or licensed by BellSouth to Crown
and, in turn, subleased or sublicensed by Crown to third parties.  That portion
of a Tower Site which is leased or licensed by BellSouth pursuant to this
Agreement will be individually referred to as a "Tower Space Site".

     2.2  TOWER SPACE SITE LEASE ACKNOWLEDGMENTS.  Crown shall not lease a Tower
          --------------------------------------                                
Space Site from BellSouth unless at the same time it has a third party (the
"Sublessee") willing to lease, sublease or license the same, Tower Space Site
from Crown. When Crown and a Sublessee agree on the particular terms for the
lease or license of a Tower Space Site complying with the Master Lease
Agreement, BellSouth, Crown and the Sublessee will execute a Site Lease
Acknowledgment ("SLA") in the form attached to the Master Lease Agreement.
Instead of having the Master Lease apply to the SLA, Crown and a Sublessee which
is a party to an agreement listed in Exhibit "A" may elect to have the agreement
to which the Sublessee is a party apply, in which case said master agreement
shall govern all relations among BellSouth, Crown, and the Sublessee as if it
were the Master Lease.

     2.3  SLA PROCESS.  Crown shall indicate that it has a third party with an
          -----------                                                         
interest in subleasing a particular Tower Space Site by completing an SLA,
having the Sublessee execute the SLA, and forwarding it to BellSouth for
execution, subject to compliance with Section 1.2 of the Master Lease Agreement.
Crown shall execute the SLA when received from BellSouth and return it to
BellSouth. Crown shall not have any right to any marketing fees in respect of
any

                                       3
<PAGE>
 
SLA that it has not fully executed and returned to BellSouth in accordance with
Section 1.2 of the Master Lease Agreement.

3.   TERM
     ----

     3.1  TERM.  Except as provided on Exhibit "C" hereto or in Section 3.2
          ----                                                             
below, the term of this Agreement shall be for one hundred (100) days from the
date first written above (such one hundredth (100/th/) day is referred to herein
as the "Termination Date") after which the provisions of Section 18.2.1 shall
apply.

     3.2  EXTENSION TO FACILITATE FORMATION OF PERMANENT ENTITY.  In the event
          -----------------------------------------------------               
that within one hundred (100) days of the date first written above, the parties
have entered into an agreement to form a permanent entity as contemplated by
Section 17, the term of this Agreement shall extend to the time of the last
closing to occur under said agreement of the tower assets in the states listed
on Exhibit "A" hereto or the abandonment or termination of said agreement at
which time this Agreement shall automatically terminate, and Sections 18.2.2 or
18.2.3, as applicable, shall apply.  Notwithstanding the termination of this
Agreement, Crown shall be entitled to its marketing fee due to Crown pursuant to
the provisions of Section 5 hereof in respect of SLAs which are executed by
BellSouth during the term of this Agreement.


4.   ASSIGNMENT OF CROWN'S RIGHTS AND OBLIGATIONS IN SLAS
     ----------------------------------------------------

     At any time after the Commencement Date as defined in an SLA, BellSouth may
elect pursuant to Sections 1.3 and 19.2 of the Master Lease Agreement to have
Crown to assign to it all Crown's rights and obligations under the SLA, after
which Crown shall cease to be the lessee of BellSouth and the Sublessor of
Sublessee, and BellSouth shall be the direct lessor of Sublessee, and Sublessee
shall be the direct lessee of BellSouth.  With respect to an SLA governed by one
of the agreements listed on Exhibit "A", upon BellSouth's providing a notice to
Crown that it elects to receive an assignment from Crown of an SLA, Crown shall
be deemed similarly to have assigned its rights and obligations under such SLA
to BellSouth without further act. Crown shall ensure that all SLAs provide that,
by virtue of such assignments BellSouth shall assume all the obligations of
Crown to Sublessee set forth in the SLA and the Master Lease Agreement or the
other applicable master agreement, and recognize all the rights of Sublessee,
including the right to quiet enjoyment of the Tower Space Site, and Sublessee
shall attorn to BellSouth, agreeing to pay rent directly to BellSouth or as
BellSouth may direct, and agreeing with BellSouth to comply with all other
provisions of the Master Lease Agreement or the other applicable master
agreement and the SLA.  Upon BellSouth's request as to any assignment, Crown
shall execute an Assignment in the form of Exhibit "7" to the Master Lease
Agreement to evidence such assignment.

                                       4
<PAGE>
 
5.   FEES
     ----

     5.1  THIRD PARTY RENTALS.  Crown shall receive a marketing fee as
          -------------------                                         
calculated in Section 5.3 for any SLA which is executed by Crown and Tenant
pursuant to this Agreement and the Master Lease Agreement, so long as such
Tenant utilizes a Tower Site within six months after such Tenant executes such
SLA and (a) with respect to which SLA Crown was the actual procuring cause or
(b) with respect to which SLA any of the entities listed on Exhibit "B" hereto
is the third party, regardless whether Crown is the actual procuring cause and
regardless of the process through which such third party may occupy a Tower
Site. For purposes of this Agreement, "Third Party Rentals" shall be defined as
gross rents or other consideration paid by third parties, commencing at any time
from the date first written above and continuing for so long as such third
party, its successors and assigns, utilizes the Tower Site. Third Party Rentals
shall specifically include gross rents or other recurring consideration paid by
Sublessees who have, prior to the expiration or termination of this Agreement,
who have executed an SLA to either Crown or BellSouth. The calculation of such
Third Party Rentals shall not include payments to BellSouth for services such as
installation fees, maintenance fees, professional service fees, site development
fees, tap-in fees, bolt-on fees, or fees for any services provided for or on
behalf of such third parties by BellSouth or its agents (not including Crown,
its affiliates or agents) in connection with their installations, all of which
amounts shall be paid directly to BellSouth, and not through Crown.

     5.2  ELECTION BY BELLSOUTH TO RECEIVE PAYMENTS DIRECTLY.  At any time
          ---------------------------------------------------             
BellSouth may elect to have all the Sublessees make payments directly to
BellSouth, by notifying Crown and the Sublessees of such election.

     5.3  DISTRIBUTION OF THIRD PARTY RENTALS.  Crown shall receive a marketing
          -----------------------------------                                  
fee of [*] percent ([*]) of Third Party Rentals. The remaining [*] percent ([*])
of the Third Party Rentals shall be paid to or retained by BellSouth, as
applicable.

     5.4  COLLECTIONS; PAYMENT OF FEES.  Payments due Crown and BellSouth
          ----------------------------                                   
pursuant to the terms of this Agreement shall be made in the following manner:
At the-beginning of each month, the party receiving the Third Party Rentals (the
"Receiving Party shall calculate the total amount of Third Party Rentals
actually collected during the prior month. Crown, if applicable, shall collect
Third Party Rentals solely as the agent of BellSouth and not for its own
account. The Receiving Party shall use commercially reasonable efforts to
collect the Third Party Rentals in the same manner as it would collect from its
own tenants. Any reasonable out-of-pocket expenses actually and necessarily
(based on standards the Receiving Party applies in its own collections) incurred
by the Receiving Party in collection, including by or through an attorney, shall
be reimbursable to the Receiving Party out of and shall reduce the Third Party
Rentals. In the event Crown is the Receiving Party, Crown shall remit to
BellSouth the Third Party Rentals, less the amount of Crown's marketing fee in
respect thereof, within thirty (30) days of the end of the prior month, free and
clear of any claims and without any set-off or recoupment. In the event
BellSouth is the Receiving Party, BellSouth shall remit to Crown the

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.

                                       5
<PAGE>
 
Third Party Rentals, less the amount retained by BellSouth as set forth in
Section 5.3, within thirty (30) days of the end of the prior month, free and
clear of any claims and without any set-off or recoupment. Overdue amounts from
the Receiving Party shall bear interest at a rate of one and one-half percent
(1.5%) per month on such amount. All monthly payments shall be predicated upon
actual Third Party Rentals collected by the Receiving Party during the prior
month.  Crown and BellSouth specifically acknowledge that they shall have no
recourse against the other as a result of a failure of payment or other breach
of obligation by any third party related to Third Party Rentals. The calculation
of Third Party Rentals shall not include payments to either BellSouth or Crown
by Sublessees for services such as installation, maintenance fees, professional
service fees, site development fees, tap-in fees, bolt-on or fees for any third
party services provided by that party to said Sublessees, subject to that
party's compliance with Section 4.3 of the Master Lease Agreement as to such
payments.

6.   EXAMINATION OF RECORDS
     ----------------------

     The Receiving Party agrees to, at all times during this Agreement and
during the existence of any SLAs related thereto, maintain financial records,
including books of account, which detail all Third Party Rentals and all out of
pocket expenses incurred by the Receiving Party in connection with the
collection of Third Party Rentals.  The Receiving Party shall make the same
available to the other party upon request, and that party may conduct or cause
to be conducted, at its sole expense, an independent audit of the Receiving
Party's financial records, books of account, and other records and documents
related to the calculation and payment of gross rental and license payments
pursuant to the terms set forth above.  If any such audit concludes that in any
month the Receiving Party's calculation of Third Party Rentals is more than five
percent (5%) less than the actual amount thereof, the Receiving Party shall
reimburse the other party for all fees, costs and expenses paid by that party
for the audit.


7.   REPRESENTATIONS, WARRANTIES AND COVENANTS
     -----------------------------------------

     7.1  MUTUAL.  Each of Crown and BellSouth represents, warrants and
          ------                                                       
covenants to the other:

          7.1.1  It has full right, power and authority to make this Agreement
                 and to enter into the Master Lease Agreement and the SLAs;

          7.1.2  The making of this Agreement and the performance thereof will
                 not violate any laws, ordinances, restrictive covenants or
                 other agreements under which either party is bound;

          7.1.3  Each party is or will be qualified to do business in all states
                 in which the Tower Sites are located;

                                       6
<PAGE>
 
          7.1.4  All persons signing on behalf of either party are authorized to
                 do so by appropriate corporate or partnership action; and

          7.1.5  Neither party shall engage in any activity which serves to
                 impede the performance of any process embodied in this
                 Agreement and each party agrees to act in good faith and to
                 utilize commercially reasonable efforts to accomplish the
                 purposes of this Agreement. Examples of a breach of this
                 provision are the lack of a good faith marketing effort by
                 Crown or the arbitrary denial by BellSouth of approvals of SLAs
                 pursuant to this Agreement.

     7.2  NO BROKERS. BellSouth and Crown represent to each other that neither
          ----------                                                          
has had any dealings with any real estate brokers or real estate agents in
connection with this Agreement. Each party shall be responsible for the payment
of any fees, commissions, costs, expenses or other sums due with respect to any
other advisor or agents retained by that party.


8.   DEFAULT
     -------

     8.1  CROWN'S DEFAULT.  The occurrence of any one or more of the following
          ---------------                                                     
events shall constitute an "event of default" by Crown under this Agreement:

          8.1.1  If Crown fails to pay any sums payable by Crown pursuant to
                 this Agreement within five (5) business days of Crown's receipt
                 of written request for payment;

          8.1.2  If any petition is filed by or against Crown, under any section
                 or chapter of the present or any future federal Bankruptcy Code
                 or under any similar law or statute of the United States or any
                 state thereof (and with respect to any petition filed against
                 Crown, such petition is not dismissed within ninety (90) days
                 after the filing thereof), or Crown is adjudged bankrupt or
                 insolvent in proceedings filed under any section or chapter of
                 the present or any future Bankruptcy Code or under any similar
                 law or statute of the United States or any state thereof;

          8.1.3  If a receiver, custodian or trustee is appointed for Crown or
                 for any of the assets of Crown and such appointment is not
                 vacated within sixty (60) days of the date of appointment;

          8.1.4  If Crown makes a transfer in fraud of creditors;

          8.1.5  If there is a breach of any representation, warranty or
                 covenant set forth in this Agreement excluding any SLA and the
                 non-payment of any sums by Crown, which is not cured within the
                 Cure Period; for purposes hereof,

                                       7
<PAGE>
 
                 during the first 100 days of this Agreement, the "Cure Period"
                 shall mean within ten (10) days of receipt of written notice,
                 and thereafter (if the Agreement is not terminated after 100
                 days) the "Cure Period" shall mean within sixty (60) days of
                 receipt of written notice;

          8.1.6  If there is a breach of any representation, warranty or
                 covenant of Crown set forth in any SLA or in the Master Lease
                 Agreement, excluding the nonpayment of any sums by Crown, which
                 is not cured within sixty (60) days of receipt of written
                 notice.

     8.2  BELLSOUTH'S REMEDIES. If an event of default occurs with respect to
          --------------------                                               
Section 8.1.2, 8.1.3, or 8.1.4 above, without limiting any other remedies it may
have, BellSouth may terminate this Agreement and the Master Lease Agreement, in
which event Crown shall immediately assign its rights and obligations under all
SLAs to BellSouth and BellSouth shall accept such assignments. If an event of
default occurs with respect to Section 8.1.1, 8.1.5 or 8.1.6 above, BellSouth
may terminate such SLAs as to Crown, in which event Crown shall assign only its
rights and obligations under the applicable SLAs to BellSouth and BellSouth
shall accept such assignments; provided however that if Crown is or has been in
default of the lesser of: five percent (5%) of the total SLAs in any one State
or fifty (50) SLAs then in effect, BellSouth may terminate this Agreement as
provided in the first sentence of this Section 8.2.

     8.3  BELLSOUTH'S DEFAULT.  If BellSouth is in breach of any representation,
          -------------------                                                   
warranty or covenant set forth in this Agreement and such breach is not cured
within sixty (60) days of receipt of written notice thereof.

     8.4  CROWN'S REMEDIES.  In the event of a default by BellSouth, Crown may,
          ----------------                                                     
without limiting any other remedies it may have, at Crown's option upon written
notice:

          8.4.1  Terminate the applicable SLA as to Crown; and

          8.4.2  Assign to BellSouth all its improvements in the Tower Space
                 Sites to which the SLAs relate.

     Crown may elect any one or more of the foregoing remedies with respect to
any particular SLA.

     8.5  REMEDIES FOR BREACH OF GOOD FAITH.  In the event of a breach by either
          ---------------------------------                                     
party of the covenant set forth in Section 7.1.5, the other party may
unilaterally terminate this Agreement and the Master Lease Agreement upon five
(5) business days written notice to the breaching party. In addition to any
other remedies available as described above in this Section 8, or in Section
18.2, or otherwise, the party breaching Section 7.1.5 shall be liable to the
other party, notwithstanding any other provision in this Agreement to the
contrary, for that party's actual damages, plus costs and attorneys' fees, but
not for any special, incidental or consequential damages of any nature
whatsoever.  The party alleged to have breached Section 7.1.5 may, in order to
preclude the

                                       8
<PAGE>
 
unilateral termination of this Agreement, bring an action in equity, including a
request for preliminary injunctive relief, challenging the alleged breach of
Section 7.1.5.

     8.6  DUTY TO MITIGATE DAMAGES. BellSouth and Crown shall endeavor in good
          ------------------------                                            
faith to mitigate damages arising under this Agreement

     8.7  NOTICES AS TO OTHER DEFAULTS. If, with respect to any indebtedness or
          ----------------------------                                         
obligation to pay money in excess of $10,000,000, the lender or payee shall
assert that Crown or Crown Castle (as defined below) is in default as to any
required payment, or if Crown or Crown Castle should default in making any such
payment timely, or in the observance of any other covenants or obligations with
respect to such indebtedness or obligation to pay money, or if Crown or Crown
Castle should be required to notify any lender of the existence of any such
default then Crown shall give BellSouth prompt notice of such circumstances,
describing them with particularity.

     8.8  CROWN'S ENTITLEMENT TO MARKETING FEES.  Notwithstanding any provision
          -------------------------------------                                
to the contrary contained in this Agreement, the Master Lease Agreement and any
SLA, Crown shall be entitled to its marketing fees as set forth in Section 5 so
long as Crown or BellSouth receives the payment of Third Party Rentals,
notwithstanding any event of default by either party and regardless whether such
event of default result in the termination of this Agreement, the Master Lease
Agreement and any SLA; provided however that Crown shall not be entitled to
receive any further marketing fees from BellSouth with respect to the SLAs if
Crown fails to perform with respect to the acquisition of the Tower Sites in the
event of a BellSouth election to put its Tower Sites as described in Exhibit "C"
attached hereto.  In such event, the right to withhold any further payment of
the marketing fees otherwise payable to Crown shall be BellSouth's sole legal
remedy and no further legal or equitable remedies shall be available to
BellSouth.

9.   ENTIRE AGREEMENT
     ----------------

     It is agreed and understood that this Agreement, including the Master Lease
Agreement and all SLAs, contain all the agreements, promises and understandings
between BellSouth and Crown and that no verbal or oral agreements, promises or
understandings shall be binding upon either BellSouth or Crown in any dispute,
controversy or proceeding at law, and any addition, variation or modification to
this Agreement shall be void and ineffective unless made in writing signed by
the parties.

10.  GOVERNING LAW
     -------------

     The laws of the State of Georgia, disregarding conflict of law principles,
shall govern this Agreement.  Each party submits to the jurisdiction of any
federal or state court sitting in Fulton County, Georgia with the exception that
disputes pertaining exclusively to the real estate interests of a particular
Site shall be litigated in the jurisdiction in which the Site is located.

                                       9
<PAGE>
 
11.  ASSIGNMENT
     ----------

     (a)  This Agreement may not be sold, subleased, assigned or transferred by
Crown without prior approval or consent of BellSouth; provided, however, that
Crown may assign its interest to its parent company, any subsidiary or affiliate
or to any successor-in-interest or entity acquiring 51% or more of its stock or
assets, subject to this Agreement.

     (b)  This Agreement may not be sold, subleased, assigned or transferred by
BellSouth without prior approval or consent of Crown; provided, however, that
BellSouth may sublease, assign or transfer its interest to (i) a third party so
long as such party has a net worth (computed in accordance with generally
accepted accounting principles) equal to or greater than $25 million or (ii) its
parent company, any subsidiary or affiliate or to any successor-in-interest or
entity acquiring 51% or more of its stock or assets, subject to this Agreement.

     (c)  BellSouth consents to the assignment by Crown of the marketing fees
payable to Crown pursuant to this Agreement.  Any such assignment shall be
subject and subordinate to all rights and interests of BellSouth under this
Agreement including, without limitation, BellSouth's-rights to collect directly
from the Sublessees set forth in Section 5.4; provided that, such assignment
shall not constitute assumption by the Financing Entity of any obligations under
this Agreement unless and until the Financing Entity elects to assume Crown's
rights and obligations herein in the event Crown defaults under the Financing
Agreement or any agreement with the Financing Entity related thereto.  Any
attempted assignment by Crown of any of its rights as BellSouth's lessee  under
the Master Lease Agreement, or as the Sublessee's sublessor under the Master
Lease Agreement, except as expressly permitted pursuant to the terms of the
Master Lease Agreement, shall be absolutely null and void ab initio, and without
                                                          -- ------             
any force and effect.  Crown shall not have any interest under this Agreement or
the Master Lease Agreement which is capable of being pledged or assigned as
security to the Financing Entity, other than Crown's marketing fees, as
described and subject to the limitations set forth above.  Any such assignment
of Crown's marketing fees to the Financing Entity as security does not relieve
Crown of any liabilities or obligations for performance identified in this
Agreement.

12.  SEVERABILITY
     ------------

     If any provision of this Agreement or any SLA is invalid or unenforceable
with respect to any party, the remainder of this Agreement, or the application
of such provision to persons other than those as to whom it is held invalid or
unenforceable, is not to be affected and each provision of this Agreement is
valid and enforceable to the fullest extent permitted by law.

13.  NO WAIVER
     ---------

     No provision of this Agreement shall be deemed to have been waived by
either party unless the waiver is in writing and signed by the party against
whom enforcement is attempted.  The rights granted in this Agreement are
cumulative of every other right or remedy that the enforcing party

                                       10
<PAGE>
 
may otherwise have at law or in equity or by statute and the exercise of one or
more rights or remedies will not prejudice or impair the concurrent or
subsequent exercise of other rights or remedies.

14.  REPRESENTATION
     --------------

     The parties acknowledge and agree that they have been represented by
counsel and that each of the parties has participated in the drafting of this
Agreement. Accordingly, it is the intention and agreement of the parties that
the language, terms and conditions of this Agreement are not be construed in any
way against or in favor of any party hereto by reason of the responsibilities in
connection with the preparation of this Agreement.


15.  NOTICES
     -------

     Any notice or demand required to be given in this Agreement shall be made
by first class mail, or reliable overnight courier, to the address of the other
party set forth below:

     As to Crown:        Crown Communications
                         Southpointe
                         375 Southpointe Boulevard
                         Canonsburg, PA 15317
                         Attn: Legal Department

     With a copy to:     Sittig, Cortese & Wratcher
                         1515 Frick Building
                         Pittsburgh, PA 15219
                         Attn: William R. Sittig, Jr.

     As to BellSouth:    BellSouth Mobility Inc
                         1100 Peachtree Street, NE, 10/th/ Floor
                         Atlanta, GA 30367
                         Attn: President

     With a copy to:     BellSouth Mobility Inc
                         Legal Department
                         1100 Peachtree Street, NE, 10/th/ Floor
                         Atlanta, GA 30367
                         Attn: General Counsel

     Any such notice or demand by mail shall be deemed to be received two (2)
business days following deposit in the United States first class mail addressed
as required above or, if delivered

                                       11
<PAGE>
 
by overnight courier, one (1) business day following deposit with such
courier. BellSouth or Crown may from time to time designate any other address
for this purpose by giving written notice to the other party.

16.  BINDING EFFECT
     --------------

     This Agreement shall extend to and bind the heirs, personal
representatives, successors and permitted assigns of the parties hereto.

17.  ADDITIONAL NEGOTIATIONS
     -----------------------

     Crown and BellSouth, by execution of this Agreement, acknowledge their
mutual intent to explore the formation of a permanent entity to serve their
mutual interests regarding the future ownership, management and utilization of
the Tower Space Sites.  In the event that no successor entity is created by
Crown and BellSouth, the terms and conditions set forth herein and in each SLA
shall continue in full force and effect subject only to the expiration and
termination provisions set forth herein.  The foregoing represents an expression
of the parties' mutual intent and shall not be construed to represent a binding
or enforceable agreement of the parties or create any obligations of the parties
to form any such entity or enter into any binding or enforceable agreement in
respect thereof.  No such obligations of the parties shall arise unless and
until the parties enter into definitive written agreements with respect thereto.

18.  TERMINATION
     -----------

     18.1    TERMINATION UPON CERTAIN DEFAULTS.
             ----------------------------------

     18.1.1  In the event BellSouth exercises its rights to terminate this
Agreement and the Master Lease Agreement upon Crown's default as set forth in
Section 8.5, the appointment of Crown as BellSouth's exclusive marketing agent
and as BellSouth's agent to collect rents shall be terminated, Crown shall be
deemed to have assigned all its SLAs to BellSouth, without further act, and
BellSouth shall be deemed to have accepted such assignments, the restrictions on
Crown's right to market towers for others in the Territory shall terminate, and
BellSouth shall no longer have any obligation to pay any marketing fees
whatsoever to Crown under this Agreement.

     18.1.2  In the event Crown exercises its rights to terminate this Agreement
and the Master Lease upon BellSouth's default as set forth in Section 8.5, or in
the event BellSouth exercises its rights to terminate this Agreement and the
Master Lease Agreement under Section 8.2, the appointment of Crown as
BellSouth's exclusive marketing agent and as BellSouth's agent to collect rents
shall be terminated, Crown shall be deemed to have assigned all its SLAs to
BellSouth, without further act, and BellSouth shall be deemed to have accepted
such assignments, the

                                       12
<PAGE>
 
restrictions on Crown's right to market towers for others in the Territory shall
terminate, but BellSouth shall continue to be obligated to pay marketing fees
due to Crown under this Agreement with respect to Third Party Rentals.

     18.2    TERMINATION IN THE EVENTS FORESEEN IN SECTION 3.
             ----------------------------------------------- 

     18.2.1  In the event this Agreement terminates by the expiration of its
term pursuant to Section 3.1, the appointment of Crown as BellSouth's exclusive
marketing agent and as BellSouth's agent to collect rents shall be terminated,
Crown shall be deemed to have assigned all its SLAs to BellSouth, without
further act, and BellSouth shall be deemed to have accepted such assignments,
the restrictions on Crown's right to market towers for others in the Territory
shall terminate, but BellSouth shall continue to be obligated to pay marketing
fees due to Crown under this Agreement with respect to Third party Rentals.

     18.2.2  In the event that the parties have entered the agreement to form
a permanent entity as contemplated by Section 17, and the closings of the tower
assets in all the states listed on Exhibit "A" hereto have occurred under that
agreement, then the appointment of Crown as BellSouth's exclusive marketing
agent and as BellSouth's agent to collect rents shall be terminated, Crown shall
be deemed to have assigned all its SLAs to BellSouth, without further act, and
BellSouth shall be deemed to have accepted such assignments, the restrictions on
Crown's right to market towers for others in the Territory shall terminate, and
BellSouth shall no longer have any obligation to pay any marketing fees
whatsoever to Crown under this Agreement.

     18.2.3  In the event that the parties have entered the agreement to form a
permanent entity as contemplated by Section 17, and that agreement has been
abandoned or terminated, then, with respect to this Agreement, the appointment
of Crown as BellSouth's exclusive marketing agent and as BellSouth's agent to
collect rents shall be terminated, Crown shall be deemed to have assigned all
its SLAs to BellSouth, without further act, and BellSouth shall be deemed to
have accepted such assignments, the restrictions on Crown's right to market
towers for others in the Territory shall terminate, but BellSouth shall continue
to be obligated to pay marketing fees due to Crown under this Agreement with
respect to Third Party Rentals.


19.  PRIOR AGREEMENTS
     ----------------
 
     This Agreement revokes and supersedes any other oral or written agreements
between the parties, whether or not in writing, that pertain to the subject
matter described herein, except for that certain Mutual Nondisclosure Agreement
entered into between BellSouth Corporation and Crown Castle International Corp.
("Crown Castle") as of April 17,1998 (the "Nondisclosure Agreement") and the
Master Lease Agreement.

                                       13
<PAGE>
 
20.  NON-DISCLOSURE
     --------------

     The parties agree that without the express written consent of the other
party, neither party shall reveal, disclose or promulgate to any third party the
terms of this Agreement or any portion thereof, except to such third party's
auditor, accountant, attorney or investment-banker or to a governmental agency
if required by regulation, subpoena or government order to do so.  Any such
disclosure shall be made in compliance with the terms and conditions of the
Nondisclosure Agreement. The foregoing two sentences shall survive any
termination of this Agreement.  Crown has indicated to BellSouth that Crown
Castle contemplates filing a Form S-1 with the Securities and Exchange
Commission to register common stock. Prior to filing such Form S-1, Crown shall
cause Crown Castle to provide BellSouth with an opportunity to review and
comment on any disclosures of this Agreement in said Form S-1. If Crown Castle
intends to name BellSouth in the Form S-1 as party to this Agreement, BellSouth
shall have the right to approve any such disclosures, which approval shall not
be unreasonably withheld or delayed.

21.  SURVIVAL
     --------

     All those sections whose survival is required to give effect to all
continuing obligations set forth in the termination provisions of this Agreement
shall survive the termination of this Agreement, and in case of doubt, a section
shall be construed as having survived.

22.  COUNTERPARTS
     ------------

     This Agreement may be executed in any number of counterparts with the same
effect as if all signing parties had signed the same document. All counterparts
shall be construed together and constitute the same instrument. Signatures by
facsimile shall have the same force and effect as original signatures.


                            (SIGNATURES ON PAGE 15)

                                       14
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement on
the day and year first written above.


ATTEST:                              BELLSOUTH MOBILITY INC.

/s/ John A. Harwood                  /s/ Mark L. Feilder                 
- -----------------------------        ----------------------------        
                                     Mark L. Feidler                     
                                     President                            
                                     


ATTEST:                              CROWN COMMUNICATION INC. d/b/a
                                     CROWN COMMUNICATIONS


_____________________________        By:  /s/ Robert A. Crown
                                        -------------------------
                                          Robert A. Crown
                                          President and Chief Executive Officer


     In consideration of the mutual covenants contained herein, and for other
good and valuable consideration, the receipt of which is hereby acknowledged,
Crown Castle International Corp. ("CCIC") hereby guarantees the performance of
all duties and obligations of Crown Communication Inc. with respect to the terms
of this Agreement. CCIC further warrants that the signatories below possess the
requisite authority to execute this Guaranty.

ATTEST:                              CROWN CASTLE
                                     INTERNATIONAL CORP.


_____________________________        By:  /s/ David L. Ivy
                                        -------------------------

                                       15
<PAGE>
 
                  Exhibit "A" to the Site Marketing Agreement
                  -------------------------------------------


LIST OF STATES AS TO WHICH THIS SITE
MARKETING AGREEMENT IS APPLICABLE

Kentucky, only.

                                       16
<PAGE>
 
                  Exhibit "B" to the Site Marketing Agreement
                  -------------------------------------------


EXISTING BELLSOUTH THIRD PARTY AGREEMENTS

1.   Master Antenna Site Lease Agreement between AT&T Wireless Services, Inc.
     d/b/a AT&T Wireless Services and BellSouth Cellular Corp. dated March
     9,1998;

2.   Master Antenna Site Lease Agreement between Nextel South Corp. and
     BellSouth Cellular Corp. dated November 21, 1997;

3.   Master Antenna Site Lease Agreement between BellSouth Cellular Corp. and
     American Cellular Communications Corporation and RAM Mobile Data USA
     Limited Partnership dated March 13, 1998;

4.   Master Antenna Site Lease Agreement between ALLTEL Communications, Inc. and
     BellSouth Cellular Corp. dated April 2,1998;

5.   Master Antenna Site Lease Agreement between BellSouth Cellular Corp. and
     Powertel, Inc. dated March 26, 1998; and

6.   Master Antenna Site Lease Agreement between Sprint Spectrum L.P. and
     BellSouth Cellular Corp. dated February 24, 1998.

7.   Master Antenna Site Lease Agreement between Telecorp Holding Corp. and
     BellSouth Cellular Corp. dated May 13, 1999.

                                       17
<PAGE>
 
                  Exhibit "C" to the Site Marketing Amendment
                  -------------------------------------------

SPECIAL TERMINATION PROVISIONS AS TO
TOWERS SITES LOCATED IN THE STATE OF KENTUCKY

In the event that the parties fail to timely enter into an agreement to form the
permanent entity described in Section 3.2, BellSouth shall, in BellSouth's
discretion, elect one of the three following options: (i) to put to Crown all of
BellSouth's Tower Sites in the state of Kentucky, for a price to be agreed upon
based upon the fair market value of the Tower Sites, which price, however, shall
in no event be less than $75,000,000; (ii) to extend the term of this Agreement
for an additional term of five (5) years, or (iii) to form a joint venture with
Crown on mutually agreed terms whereby BellSouth will put its Tower Sites to the
joint venture in the manner and for the values, described below, as if BellSouth
had exercised its put to Crown, and Crown will make a cash contribution to the
joint venture equal to the value of BellSouth's Tower Sites, determined in the
same manner as below, as if BellSouth had exercised its put to Crown, but in no
event shall such values be less than $75,000,000. Prior to the Termination Date,
BellSouth must notify Crown of its election.  In the event BellSouth fails to
timely provide such notice, the term of this Agreement, as to the Tower Sites
located in the State of Kentucky only, will automatically be extended for an
additional term. of five (5) years. In the event BellSouth timely notifies Crown
of its election to put its Tower Sites in the state of Kentucky to Crown, the
term of this Agreement, as to the Tower Sites located in the state of Kentucky
only, will automatically be extended until the time of closing on the sale to
Crown of BellSouth's Tower Sites in Kentucky. Such put of Tower Sites shall be
in the form of subleases of the Tower Sites whereby all the economic interest
(and burdens) in the Tower Sites are transferred to Crown, BellSouth reserving
to itself all space it currently occupies and a right of first refusal on any
new spaces proposed to be leased to others. In such event, BellSouth shall pay
rent to Crown for the space that it currently occupies on each Tower Site at the
rate of $[*] per month, as adjusted from time to time according to a formula to
be agreed upon, plus an additional amount to be mutually agreed upon for
sectorized Tower Sites if applicable. As to Tower Sites where BellSouth cannot
obtain any required consent of the ground lessor or of the minority holders in
any affiliate of BellSouth which is the ground lessee, BellSouth shall retain
the Tower Sites, and the acquisition price will be reduced pro rata based on the
number of Tower Sites retained over the total of Tower Sites in Kentucky. In
addition, the acquisition price shall be reduced by the present value of current
payments due to Crown over the balance of the terms of the applicable SLAs with
respect to Tower Sites being transferred, which present value shall be reduced
by historical bad debt experience. In the event that Crown and BellSouth cannot
agree upon a fair market value for said Tower Sites within fifteen (15) days of
the Termination Date, then Crown and BellSouth agree; that Lehman Brothers shall
act as an independent third party appraiser to establish the fair market value
of the Tower Sites. It is understood that the fair market value of the Tower
Sites shall include all revenues arising from the Tower Sites on an undivided
basis. The decision of the independent third party appraiser shall be final and
binding and shall be construed as and enforced in the same manner as a decision
rendered pursuant to binding arbitration. Crown shall purchase the Tower Sites
as soon as practicable after the decision of the independent third party
appraiser and all regulatory and contractual consents are obtained, but in no
event later than ninety (90) days after determination of the fair market value
by the independent third party appraiser.

[*] indicates where text has been omitted pursuant to a request for confidential
    treatment. The omitted text has been Filed with the Securities and Exchange
    Commission separately.

                                       18
<PAGE>
 
After the closing of Crown's purchase of the Tower Sites, this Agreement shall
terminate, with the following consequences: the appointment of Crown as
BellSouth's exclusive marketing agent and as BellSouth's agent to collect rents
shall be terminated, Crown shall be deemed to have assigned all its SLAs to
BellSouth, without further act, and BellSouth shall be deemed to have accepted
such assignments, the restrictions on Crown's right to market towers for others
in Kentucky shall terminate, and BellSouth shall no longer have any obligation
to pay any marketing fees whatsoever to Crown under this Agreement. If after the
expiration of such ninety (90) days Crown does not purchase the Tower Sites,
this Agreement shall terminate, with the following consequences; the appointment
of Crown as BellSouth's exclusive marketing agent and as BellSouth's agent to
collect rents shall be terminated, Crown shall be deemed to have assigned all
its SLAs to BellSouth, without further act, and BellSouth shall be deemed to
have accepted such assignments, the restrictions on Crown's right to market
towers for others in Kentucky shall terminate, and BellSouth shall not be
obligated to pay any marketing fees due to Crown under this Agreement. In any
event, BellSouth and Crown shall each pay one-half of Lehman Brothers'
reasonable fees and expenses.

                                       19


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