NTL INC /DE/
8-K, 1998-10-05
CABLE & OTHER PAY TELEVISION SERVICES
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549


                                 --------------


                                    FORM 8-K


                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


      Date of Report (Date of earliest event reported): September 22, 1998


                                NTL INCORPORATED
                                ----------------
               (Exact name of Registrant as Specified in Charter)


Delaware                             0-22616                52-1822078
- --------                             -------                ----------
(State or Other Jurisdiction      (Commission             (IRS Employer
of Incorporation)                  File Number)         Identification No.)


110 East 59th Street, New York, New York                        10022
- ----------------------------------------                        -----
(Address of Principal Executive Offices)                      (Zip Code)


Registrant's telephone number, including area code:  (212) 906-8440



           -----------------------------------------------------------
          (Former Name or Former Address, if Changed Since Last Report)
<PAGE>   2
ITEM 2.     ACQUISITION OR DISPOSITION OF ASSETS.

            Effective September 22, 1998, NTL Incorporated (the "Company")
acquired ComTel Limited and Telecential Communications (collectively, "ComTel")
for a total of approximately pound sterling 550 million in two stages. In the
first stage, which was completed in June 1998, the Company acquired certain of
the ComTel properties for approximately pound sterling 275 million in cash. In
the second stage, which was completed on September 22, 1998, the Company
acquired the remaining ComTel properties for approximately pound sterling 200
million in cash and pound sterling 75 million in a preferred stock of the
Company. Such preferred stock has a pay-in-kind coupon of 9.9%, will mature in
2008 and is redeemable within 15 months for common stock of the Company valued
at market, new convertible preferred securities of the Company or cash.

            The Company financed the acquisition of ComTel through a bank loan,
completed through an amendment to the Company's existing credit facility with
The Chase Manhattan Bank. ComTel does not have any outstanding indebtedness.

ITEM 7.     FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND
            EXHIBITS.

(a)   Financial Statements of Businesses Acquired.

            The financial statements of ComTel UK Finance B.V. set forth on
pages F-90 through F-108, and the financial statements of Telecential
Communications (Canada) Limited and Telecential Communications (UK) Limited set
forth on pages F-109 through F-120, of the Joint Proxy Statement/Prospectus
included in the Registration Statement on Form S-4 (File No. 333-64727) of the
Company (the "Form S-4") are hereby incorporated herein in their entirety by
reference.

(b)   Pro Forma Financial Information.

            The unaudited pro forma financial data set forth on pages 49 through
56 of the Joint Proxy Statement/Prospectus included in the Form S-4 are hereby
incorporated herein in their entirety by reference.

(c)   Exhibits.

      Exhibit 2.1 Agreement for the Sale and Purchase of the Vision Networks UK
                  Group, dated June 16, 1998, by and between Vision Networks
                  III B.V., ComTel UK Finance B.V., Vision Networks


                                        2
<PAGE>   3
                   (UK) I Limited, Telecential Communications (Canada) Ltd,
                   Vision Networks (UK) II Limited, Telecential Communications
                   (UK) Limited, Vision Networks UK Holding B.V., NTL Group
                   Limited and NTL Incorporated.

      Exhibit 2.2  Supplemental Agreement, dated September 22, 1998, to a Sale
                   and Purchase Agreement, dated June 16, 1998, entered into
                   between inter alia Vision Networks III B.V., ComTel UK
                   Finance B.V. and NTL Group Limited in respect of the sale and
                   purchase of the Vision Networks UK Group.

      Exhibit 99.1 Joint Proxy Statement/Prospectus included in the Form S-4
                   (incorporated by reference to the Registration Statement on
                   Form S-4 (File No. 333-64727) of the Company).


                                        3
<PAGE>   4
                                   SIGNATURES

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                    NTL INCORPORATED


                                    By:    /s/ Richard J. Lubasch
                                           ------------------------------
                                    Name:  Richard J. Lubasch
                                    Title:  Senior Vice President-General
                                            Counsel


Dated:  October 5, 1998


                                        4
<PAGE>   5
                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
Designation                         Description
- -----------                         -----------
<S>                  <C>
    2.1              Agreement for the Sale and Purchase of the Vision Networks
                     UK Group, dated June 16, 1998, by and between Vision
                     Networks III B.V., ComTel UK Finance B.V., Vision Networks
                     (UK) I Limited, Telecential Communications (Canada) Ltd,
                     Vision Networks (UK) II Limited, Telecential Communications
                     (UK) Limited, Vision Networks UK Holding B.V., NTL Group
                     Limited and NTL Incorporated.

    2.2              Supplemental Agreement, dated September 22, 1998, to a Sale
                     and Purchase Agreement, dated June 16, 1998, entered into
                     between inter alia Vision Networks III B.V., ComTel UK
                     Finance B.V. and NTL Group Limited in respect of the sale
                     and purchase of the Vision Networks UK Group.

   99.1              Joint Proxy Statement/Prospectus included in the Form S-4
                     (incorporated by reference to the Registration Statement on
                     Form S-4 (File No. 333-64727) of the Company).
</TABLE>


                                        5

<PAGE>   1
                     AGREEMENT FOR THE SALE AND PURCHASE OF
                          THE VISION NETWORKS UK GROUP

This sale and purchase agreement, hereinafter referred to as the "Agreement", is
entered into on this 16th day of June 1998 by and between

VISION NETWORKS III B.V., a private limited liability company incorporated in
accordance with the laws of the Netherlands and having its registered office at
Hoofddorp and its principal place of business at Polarisavenue 41, 2132 JH
Hoofddorp, the Netherlands, for the purposes hereof duly represented by W.
Ackermans (hereinafter referred to as the "Seller")

and

COMTEL UK FINANCE B.V. a private limited liability company incorporated in
accordance with the laws of the Netherlands and having its registered office at
Hoofddorp and its principal place of business at Polarisavenue 41, 2132 JH
Hoofddorp, the Netherlands, for the purposes hereof duly represented by W.
Ackermans (hereinafter referred to as "ComTel")

and

VISION NETWORKS (UK) I LIMITED, a private limited liability company incorporated
in England and having its registered office at Wharfedale Road, Winnersh,
Wokingham, Berkshire, RG41 5TZ, for the purposes hereof duly represented by W.
Ackermans (hereinafter referred to as "UKI")

and

TELECENTIAL COMMUNICATIONS (CANADA) LTD, a private limited liability company
incorporated in the Province of New Brunswick, Canada and having its registered
office at 300 Consilium Pl., Suite 1300, Scarborough, Ont. M1H 3G2, for the
purposes hereof duly represented by W. Ackermans (hereinafter referred to as
"Canco 1")

and

VISION NETWORKS (UK) II LIMITED, a private limited liability company
incorporated in England and having its registered office at Wharfedale Road,
Winnersh, Wokingham, Berkshire, RG41 5TZ, for the purposes hereof duly
represented by W. Ackermans (hereinafter referred to as "UKII")

and

TELECENTIAL COMMUNICATIONS (UK) LIMITED, a private limited liability company
incorporated in the Province of New Brunswick, Canada and having its registered
office at 300 Consilium Pl., Suite 1300, Scarborough, Ont. M1H 3G2 aforesaid,
for the purposes hereof duly represented by W. Ackermans (hereinafter referred
to as "Canco 3")

and

VISION NETWORKS UK HOLDING B.V. (IN LIQUIDATION) a private limited liability
company incorporated in accordance with the laws of the Netherlands and having
its registered office at Hoofddorp and its principal place of business at
Polarisavenue 41, 2132 JH Hoofddorp, the Netherlands for the purposes hereof
duly represented by its liquidator Vision Networks N.V., for the purposes hereof
duly represented by W. Ackermans (hereinafter referred to as "VNUK")
<PAGE>   2
                                       2


(ComTel, UKI, Canco 1, UKII, Canco 3 and VNUK being hereinafter referred to
jointly as the "Transferors" and individually as a "Transferor")

NTL GROUP LIMITED, a private limited liability company incorporated in England
and having its registered office at Bristol House, 1 Lakeside Road, Farnborough,
Hampshire, England, for the purposes hereof duly represented by R. Mackenzie
(hereinafter referred to as the "Purchaser")

and

NTL INC, a company incorporated and existing in accordance with the laws of the
State of Delaware, USA and having its principal place of business at 110 East
59th Street, 26th Floor, NYC10022, USA, for the purposes hereof duly represented
by J. Gregg (hereinafter referred to as the "NTL")

The Seller, the Transferors, the Purchaser and NTL are hereinafter jointly
referred to as the "Parties" and individually as a "Party".

WHEREAS

A.     The Seller is the legal and beneficial owner of the entire issued and
       outstanding share capital of ComTel;

B.     Following a number of reorganisation steps, ComTel is the direct legal
       and beneficial owner of the ComTel Companies, ComTel is the parent
       undertaking of UKI, Canco 1, UKII, Canco 3 and VNUK and UKI, Canco l,
       UKII, Canco 3 and VNUK are the direct legal and beneficial owners of the
       Telecential Assets;

C.     The sale of the Telecential Assets shall be effected through a transfer
       of (i) the partnership interests in the Telecential Communications
       Partnership by UKI and Canco 1, (ii) the shares in ComTel Limited by
       Canco 1, and (iii) the partnership interests in each of Telecential
       Communications (Warwickshire) Limited Partnership ("LP6") and Telecential
       Communications (Heartland) Limited Partnership ("LP5"), by UKII, Canco 3
       and VNUK (as applicable);

D.     Koninklijke PTT Nederland NV ("KPN"), the present sole shareholder of the
       Seller, is in the process of effecting an internal demerger
       ("afsplitsing") of the Vision Networks group of companies ("VN"), which
       will result in VN becoming an independent unconsolidated group entity,
       although owned by KPN (through Vision Networks Holdings B.V., which
       company will be created as a result of the internal demerger). Vision
       Networks Holdings B.V. will, as soon as it has been incorporated, provide
       a guarantee for the performance by the Seller of the Seller's and
       Transferors' obligations under this Agreement in the form set out in
       Schedule F;

E.     In connection with the internal demerger of VN, it is mandatory that
       sufficient funds for the release of KPN under existing obligations
       assumed by it with respect to VN are available ultimately on 16 June
       1998, whether through (i) completion of the sale of the ComTel Shares
       pursuant to this Agreement, or (ii) through the issuance of high-yield
       bonds to third parties, on such terms and in such manner as the Seller
       shall determine (the "Bond Issue"). The Parties acknowledge that the
       Purchaser has agreed to pay the sum of pound sterling 275 million for the
       ComTel Companies in the context of the transaction taken as a whole and
       in particular the subsequent acquisition of the Telecential Assets;

F.     The Purchaser desires to take transfer of the ComTel Shares and the
       Telecential Assets and the Seller and the Transferors desire to sell or
       to procure the sale and transfer of the ComTel Shares and the Telecential
       Assets to the Purchaser, all on the terms and conditions set forth below;
<PAGE>   3
                                       3


G.     NTL is a party to this Agreement for the purposes of guaranteeing the
       obligations of the Purchaser hereunder.

IT IS HEREBY AGREED AS FOLLOWS:

ARTICLE 1     DEFINITIONS AND INTERPRETATION

1.1           Capitalised terms used in this Agreement shall have the meanings
              ascribed to them in Schedule D, except as the context may
              otherwise require.

1.2           Where the words "to the best knowledge" or words to that effect
              are used in this Agreement in connection with the Seller or any
              Transferor to qualify any of the Warranties given by the Seller or
              any Transferor or in connection with Article 7.2, this shall mean
              to the best knowledge, after due inquiry, of the management of the
              Seller or Transferor concerned. The Parties agree that due inquiry
              shall mean that all reasonable efforts on the part of the Seller
              or Transferor (as the case may be) shall have been made to obtain
              reasonably detailed information with respect to the Warranties
              which are qualified by the Seller's or Transferor's best
              knowledge, including, without limitation, making enquiry of
              appropriate management individuals of the relevant ComTel
              Companies, members of the Telecential Group and Transferors. In
              respect of due inquiry with regard to Schedule I, the Parties
              acknowledge that this shall mean that due inquiry has comprised
              reasonable efforts on the part of the Seller to include in the
              data rooms and otherwise as set out in the definition of Data Room
              Information, (i) information which is true and complete to all
              material respects and (ii) the relevant information that the
              Seller should expect a reasonable purchaser to require.

ARTICLE 2     SALE, PURCHASE, PURCHASE PRICE

2.1           Subject to the terms of this Agreement, UKI agrees to:

2.1.1.        sell and assign to the Purchaser or its nominee absolutely all its
              Partnership Interest as a general partner in the Telecential
              Communications Partnership as regulated by the Telecential
              Communications Partnership partnership agreement (and for these
              purposes "Partnership Interest" means, in respect of UKI, the
              share of UKI in the Telecential Communications Partnership
              including (without limitation) its interests in the assets and
              profits of the Telecential Communications Partnership and all
              rights and privileges relating to that interest and all amounts
              paid to the Telecential Communications Partnership by way of
              capital); and

2.1.2.        subject to Articles 5.4 to 5.6, sell and transfer any other
              Relevant Asset (if any) owned by UKI.

2.2           Subject to the terms of this Agreement, UKII agrees to:

2.2.1         assign to the Purchaser or its nominee absolutely all its
              Partnership Interest as a limited partner in LP5 as regulated by
              the LP5 partnership agreement (and for these purposes "Partnership
              Interest" means, in respect of UKII, the share of UKII in LP5
              including (without limitation) its interests in the assets and
              profits of LP5 and all rights and privileges relating to that
              interest and all amounts paid to LP5 by UKII by way of capital);
              and
<PAGE>   4
                                       4


2.2.2.        subject to Articles 5.4 to 5.6, sell and transfer any other
              Relevant Asset (if any) owned by UKII.

2.3           Subject to the terms of this Agreement:-

2.3.1         ComTel agrees to sell and transfer (or procure the sale and
              transfer of) the ComTel Shares to the Purchaser or its nominee(s);

2.3.2         subject to Articles 5.4 to 5.6, ComTel agrees to sell and transfer
              any other Relevant Asset (if any) owned by ComTel;

2.3.3         VNUK agrees to assign to the Purchaser or its nominee absolutely
              all its Partnership Interest as a limited partner in LP6 as
              regulated by the LP6 partnership agreement (and for these purposes
              "Partnership Interest" means, in respect of VNUK, the share of
              VNUK in LP6 including (without limitation) its interests in the
              assets and profits of LP6 and all rights and privileges relating
              to that interest and all amounts paid to LP6 by VNUK by way of
              capital); and

2.3.4         VNUK agrees to sell and transfer, subject to Articles 5.4 to 5.6,
              any other Relevant Asset (if any) owned by VNUK.

2.4           Subject to the terms of this Agreement, Canco 1 agrees to:-

2.4.1         sell and procure the transfer of the ComTel Limited Shares to the
              Purchaser or its nominee(s);

2.4.2         sell and assign to the Purchaser or its nominee absolutely all its
              Partnership Interest as a managing general partner in the
              Telecential Communications Partnership as regulated by the
              Telecential Communications Partnership partnership agreement (and
              for these purposes "Partnership Interest" means in respect of
              Canco 1, the share of Canco 1 in the Telecential Communications
              Partnership including (without limitation) its interest in the
              assets and profits of the Telecential Communications Partnership
              and all rights and privileges relating to that interest and all
              amounts paid to the Telecential Communications Partnership by
              Canco 1 by way of capital); and

2.4.3         subject to Articles 5.4 to 5.6, sell and transfer any other
              Relevant Asset (if any) owned by Canco 1.

2.5           Subject to the terms of this Agreement, Canco 3 agrees to:

2.5.1         sell and procure the transfer of the Heartland Shares to the
              Purchaser or its nominee(s);

2.5.2         sell and assign to the Purchaser or its nominee absolutely all its
              Partnership Interest as a managing general partner in LP5 and LP6
              as regulated by the LP5 and LP6 partnership agreements
              (respectively) (and for these purposes "Partnership Interest"
              means, in respect of Canco 3, the share of Canco 3 in LP5 and LP6
              including (without limitation) its interest in the assets and
              profits of LP5 and LP6 and all rights and privileges relating to
              that interest and all amounts paid to LP5 and LP6 by Canco 3 by
              way of capital); and

2.5.3         subject to Articles 5.4 to 5.6, sell and transfer any other
              Relevant Asset (if any) owned by Canco 3.
<PAGE>   5
                                       5


2.6           The Purchaser hereby agrees or agrees to procure that its
              nominee(s) shall purchase and take transfer of all the relevant
              Assets from each Transferor in accordance with and subject to the
              terms of this Agreement.

2.7           The total purchase price for the ComTel Shares and the Telecential
              Assets jointly (hereinafter the "Purchase Price") shall be GBP
              550.000.000 (in words five hundred and fifty million Pounds
              Sterling), subject to adjustment pursuant to Articles 3.3, 4.11,
              6.8 and 6.9, consisting of GBP 475.000.000 (in words: four hundred
              and seventy five million Pounds Sterling) payable as to GBP
              275.000.000 in cash at ComTel Completion and as to GBP 200.000.000
              in cash (subject to adjustment pursuant to Articles 3.3, 4.11, 6.8
              and 6.9) and as to GBP 75.000.000 (in words: seventy five million
              Pounds Sterling) by the issue at par value of the Purchaser
              Security with a principal amount in US Dollars equal to the US$
              equivalent of GBP 75,000,000 (in words: seventy five million
              Pounds Sterling) (as determined in accordance with Article 5.3.5)
              at Telecential Completion. The Purchase Price shall be apportioned
              between the Assets as set out in Schedule A and payable to the
              relevant Transferor or as it shall direct.

2.8           The Purchaser Security shall be subject to the terms and
              conditions set out in Schedule S attached hereto.

2.9           The Seller and the relevant Transferor(s) shall procure that the
              Purchaser or its nominee(s) acquires good title to the ComTel
              Shares and the Telecential Assets free from all liens, charges in
              the nature of security interests and encumbrances whatsoever and
              together with all rights now or hereafter attaching to them.

2.10          The Seller and the Transferors hereby waive and agree to procure a
              waiver of any rights or restrictions conferred on any of them or
              any other person which may exist in relation to the Assets.

2.11          The Purchaser shall not be obliged to complete the purchase, and
              the Seller shall not be obliged to complete the sale, of any of
              the ComTel Shares unless the purchase or sale of all of the ComTel
              Shares is completed simultaneously or any of the Telecential
              Assets unless the purchase or sale of all of the Telecential
              Assets is completed simultaneously. The Seller and the Purchaser
              acknowledge that following ComTel Completion the Parties shall be
              obliged to effect Telecential Completion in accordance with the
              terms of this Agreement.

2.12          It is declared that the Purchase Price is exclusive of any value
              added tax.

ARTICLE 3     SIGNING OF THIS AGREEMENT, AND COVENANTS TO COMPLETION

3.1           This Agreement is signed on the date first above written.

3.2           The Seller and the Transferors covenant, to the Purchaser in the
              terms of Schedule C, subject to them being capable of so doing in
              view of the Purchaser's rights under the Relationship Agreement.

3.3           During the period between the ComTel Completion Date and the
              Telecential Completion Date, the Seller undertakes to the
              Purchaser to lend or procure that one or more of the Transferors
              shall lend to the members of the Telecential Group on the terms
              set out below and on an unsecured basis. The Purchaser shall, on
              behalf of the members of the Telecential Group, maintain a
              separate interest bearing bank account with a bank in the 
<PAGE>   6
                                       6


              United Kingdom to be designated by the Seller (the "Telecential
              Account"). The Seller shall provide funds on the basis of cash
              calls, during a consecutive period of 6 months from the ComTel
              Completion Date, in monthly payments of pound sterling 10 million
              to begin promptly following ComTel Completion, and for a further
              consecutive period of 12 months in monthly payments of pound
              sterling 5 million. For so long as the amount outstanding in
              credit on the Telecential Account shall exceed pound sterling 15
              million, the Seller shall not be obliged to provide further funds
              (although any funds not so provided shall be rolled-up and may at
              the Purchaser's option be paid at any time prior to Telecential
              Completion). In December 1999 (and each subsequent year in
              December) the budget for the coming year will be prepared by the
              Purchaser and jointly reviewed and approved by the Purchaser and
              the Seller, such approval not to be unreasonably withheld and the
              amount of monthly loan instalments may be adjusted downwards if
              the approved budget so justifies. It is acknowledged that any
              budget would allow the Telecential Group to meet its milestone
              requirements under its regulatory licences. The loan shall be
              interest free for a period of 3 months from the ComTel Completion,
              but shall thereafter carry interest at the rate that KPN charges
              its intercompany debtors from time to time, such interest only to
              accrue and not to become payable until Telecential Completion. The
              Purchaser shall be prohibited from applying funds out of the
              Telecential Account for any purposes other than the business of
              the members of the Telecential Group. The Purchaser shall provide
              such information as to the application of the funds from the
              Telecential Account as the Seller may reasonably request from time
              to time. Immediately prior to the Telecential Completion Date any
              loans made by the Seller or any Transferor pursuant to this
              Article 3.3 shall be capitalised in accordance with the general
              principles set out in Schedule Ind. and any new shares or capital
              contributions or payments to capital account arising on such
              capitalisation shall be deemed to be included in the Telecential
              Assets. The cash element of the Purchase Price to be paid by the
              Purchaser on the Telecential Completion Date shall be increased by
              the amount in pound sterling equal to the amount of any loans made
              by the Seller or Transferors pursuant hereto (the "Funding
              Adjustment"). The Funding Adjustment to be paid by the Purchaser
              under this Article 3.3 shall be payable in cash to the Seller
              and/or relevant Transferor(s) (as the case may be) and the Seller
              and relevant Transferor(s) shall, at the Telecential Completion
              Date, deliver the documents of the type referred to in Article
              5.3.1(a) in respect of any such new shares allotted pursuant to
              this Article 3.3, duly executed by the relevant persons (where
              applicable).

3.4           The Seller and the Transferors shall procure that prior to the
              Telecential Completion Date (but only to the extent permitted by
              law and subject to any obligations with respect to confidentiality
              owed to third parties) the Purchaser's agents, representatives,
              accountants and solicitors are given promptly on request all such
              facilities, documents, papers and information regarding the
              business, assets, liabilities, contracts and affairs of each
              member of the Telecential Group and the documents of title and
              other evidence of ownership of the assets of each member of the
              Telecential Group as the Purchaser reasonably requires, subject
              however to prevailing confidentiality obligations by which the
              Seller and the Transferors, or any of them, may be bound.

ARTICLE 4     COMTEL COMPLETION, PAYMENT, TELECENTIAL COMPLETION, PAYMENT

4.1           Completion of the sale and purchase of the ComTel Shares will take
              place on 16th June, 1998 (hereinafter referred to as the "ComTel
              Completion Date"). The transfer of the ComTel Shares will take
              place at the offices of Allen & Overy in London, UK on the ComTel
              Completion Date.
<PAGE>   7
                                       7


4.2           The sum of GBP 275.000.000 (two hundred and seventy five million
              Pounds Sterling) shall be transferred by the Purchaser on the
              ComTel Completion Date prior to 2.30 p.m. London time, by
              telegraphic transfer in immediately available funds, to the bank
              account number as designated by the Seller in the name of Royal
              PTT Nederland N.V. with ABN AMRO Bank where it shall be held in an
              interest bearing account to the order of Chase Manhattan
              International Ltd until the documents referred to in Article
              5.1.1. have been executed and delivered at which time such money
              and any interest thereon shall then be held to the order of ComTel
              which shall constitute a discharge to the Purchaser of its
              obligation to pay such monies to ComTel and so that the Purchaser
              shall have no further concern as to the distribution of such
              monies. If ComTel Completion has not occurred on the ComTel
              Completion Date due to any failure on the part of the Seller or
              ComTel to comply with Article 5.1.1 the money and any interest
              thereon shall as soon as possible be returned to the Purchaser,
              without prejudice to any other rights and remedies available to
              the Purchaser.

4.3           Completion of the sale and purchase of the Telecential Assets will
              take place at the offices of Allen & Overy in London, UK on the
              Telecential Completion Date when the transfer of the Telecential
              Assets will take place in accordance with Article 5.3. The
              Telecential Completion Date shall be determined in accordance with
              Articles 4.6 to 4.8 below.

4.4           The sum of GBP 200.000.000 (two hundred million Pounds Sterling)
              (as adjusted pursuant to Articles 3.3, 4.11, 6.8 and 6.9) shall be
              transferred by the Purchaser on the Telecential Completion Date
              prior to 2.30 p.m. UK time, by telegraphic transfer in immediately
              available funds, to the bank account as may be designated by the
              Seller where it shall be held to the order of Chase Manhattan
              International Ltd (or such other person as the Purchaser may
              nominate) until the documents referred to in Articles 5.3.1 to
              5.3.4 have been executed and delivered at which time such money
              shall then be held in an interest bearing account to the order of
              the relevant Transferors which shall constitute a discharge to the
              Purchaser of its obligation to pay such monies to the relevant
              Transferors and so that the Purchaser shall have no further
              concern as to the distribution of such monies. If Telecential
              Completion has not occurred on the Telecential Completion Date due
              to any failure on the part of the Seller and/or the relevant
              Transferors, the money and any interest thereon shall as soon as
              possible be returned to Purchaser without prejudice to any other
              rights and remedies available to the Purchaser.

4.5           Notwithstanding any other provision of this Agreement, the Seller
              and the relevant Transferor(s) undertake to use their best
              endeavours to procure the satisfaction of the obligation contained
              in Article 5.3.1(e) as soon as reasonably possible hereafter and
              in connection therewith shall act reasonably and negotiate in good
              faith with third parties to whom relevant Indebtedness is owed for
              the prompt and lawful discharge and/or cancellation of such
              Indebtedness. For the avoidance of doubt, the satisfaction of the
              obligations contained in Article 5.3.1(e)(ii) shall be effected in
              accordance with Schedule Ind provided that no member of the
              Telecential Group shall fund such satisfaction (including any
              termination or prepayment charges and associated costs in respect
              of the relevant Indebtedness) except out of the proceeds of
              subscription for new shares of such member or a capital
              contribution (if a company) or by way of further payment to a
              partner's capital account (if a partnership) and in each case such
              subscription, capital contribution or payment to capital account
              shall be made by a member of the Seller's Group (other than a
              member of the Telecential Group). Any new shares or capital
              contributions or payments to capital account made pursuant to this
              Article 4.5 shall be deemed to be included in the Telecential
              Assets sold to the Purchaser (or its nominee(s)) pursuant to this
              Agreement at no additional cost to the Purchaser. For the
              avoidance of doubt, the Seller and the relevant Transferor(s)
              shall at the Telecential Completion Date
<PAGE>   8
                                       8


              deliver, or procure the delivery of, the documents of the type
              referred to in Article 5.3.1(a) in respect of any such new shares
              allotted pursuant to this Article 4.5.

4.6           At any time between the date of this Agreement and the Long Stop
              Date when the Seller and the Transferors are able to comply (or
              have complied) with their obligations contained in Article
              5.3.1(e), the Seller shall forthwith serve notice (a "Ready to
              Complete Notice") to such effect on the Purchaser and

              4.6.1        if the Ready to Complete Notice is served on the
                           Purchaser not less than ten (10) Business Days prior
                           to 15 September 1998, the Telecential Completion Date
                           shall be 15 September 1998 or such earlier date which
                           is not more than 10 (ten) Business Days following the
                           date of the service of the Ready to Complete Notice
                           as the Purchaser may elect; or

              4.6.2        if the Ready to Complete Notice is served on the
                           Purchaser on or after the date which is ten (10)
                           Business Days prior to 15 September 1998, then the
                           Telecential Completion Date shall be on the tenth
                           Business Day after the service of the Ready to
                           Complete Notice.

4.7      Without prejudice to the obligations of the Seller and the Transferors
         under Article 4.5, (i) if the Seller shall not have served a Ready to
         Complete Notice on the Purchaser prior to 15th September 1998, or (ii)
         the Seller shall have served notice requesting the Purchaser to obtain
         such bondholder approval (as hereafter said) after 8 (eight) weeks
         following the ComTel Completion Date, then NTL shall, at its own cost,
         during the period of 6 (six) months from the date of the request by the
         Seller, apply for and use its best endeavours to obtain the consent of
         its bondholders to its acquisition of the Telecential Assets
         notwithstanding that Indebtedness is owed by any member of the
         Telecential Group to any person other than another member of the
         Telecential Group (excluding for the avoidance of doubt any member of
         the Seller's Group) and in the event of such consent being obtained on
         or prior to the expiry of such 6 (six) month period, the Purchaser
         shall forthwith serve notice (a "Consent Notice") to such effect on the
         Seller and the Telecential Completion Date shall be on the later of the
         tenth Business Day after the service of the Consent Notice and 15
         September 1998 and the Purchaser shall (without prejudice to Article
         13) be deemed to have waived the obligation of the Seller and the
         Transferors to comply with Article 5.3.1(e)(ii) (save in respect of
         Indebtedness which is owed by any member of the Telecential Group to
         any member of the Seller's Group or any of the ComTel Companies). For
         the avoidance of doubt nothing contained in this Article 4.7 or Article
         4.8 shall require NTL to apply to its bondholders for such consent on
         more than one occasion subject to it otherwise complying with this
         Article 4.7.

4.8      If at any time prior to the service of a Ready to Complete Notice or a
         Consent Notice the Purchaser becomes entitled to purchase the
         Telecential Assets notwithstanding that Indebtedness is owed by any
         member(s) of the Telecential Group to any other person without
         breaching any obligations to which it or NTL or any subsidiary
         undertaking of NTL is subject, including without prejudice any
         obligations owed to NTL's bondholders under the indentures relating
         thereto, then the Purchaser shall forthwith serve a Consent Notice on
         the Seller in which event Telecential Completion shall take place on 15
         September 1998 or, if earlier, at the election of the Purchaser, on the
         tenth Business Day after the service of the Consent Notice, or, if the
         Consent Notice is served after 30 August 1998 on the tenth Business Day
         after the service of the Consent Notice and the Purchaser shall
         (without prejudice to Article 13) be deemed to have waived the
         obligation of the Seller and the Transferors to comply with Article
         5.3.1(e)(ii) (save in respect of Indebtedness which is
<PAGE>   9
                                       9


         owed by any member of the Telecential Group to any member of the
         Seller's Group or any of the ComTel Companies).

4.9      For the purposes of this Article 4, the Long Stop Date shall be 15th
         March 1999 or, if the inability to effect the Telecential Completion is
         (i) due to the inability on the part of the Seller to cancel or
         extinguish the Indebtedness of the Telecential Group, or (ii) because a
         specific judgment prohibiting Telecential Completion is issued against
         any of the Parties (a "Restraint"), 31 December 2002.

4.10     For the avoidance of doubt, the Parties acknowledge that, except where
         Telecential Completion occurs pursuant to the service of a Consent
         Notice, satisfaction of the obligations of the Seller and the
         Transferors contained in Article 5.3.1(e) is of the essence to the
         Purchaser and that the Purchaser shall not otherwise acquire the
         Telecential Assets or any part thereof unless such obligations are
         satisfied in full.

4.11     If Telecential Completion takes place following the service of a
         Consent Notice, the amount of any Indebtedness in respect of which the
         Seller and the relevant Transferor(s) fail to comply with Article
         5.3.1(e), (including any known termination or prepayment charges
         relating to such Indebtedness) shall, without prejudice to Article 13,
         be deducted from that part of the Purchase Price to be paid in cash on
         the Telecential Completion Date (the "Indebtedness Adjustment").

4.12.    Notwithstanding the provisions of the Relationship Agreement, the
         Seller shall continue to have the exclusive conduct of any and all
         matters relating to the settlement of the Indebtedness of the
         Telecential Group and any other related Restraints which prevent
         Telecential Completion from occurring, and the management control of
         the Purchaser shall not extend to such issues. The Seller shall keep
         the Purchaser informed on a regular basis and on request in connection
         with the conduct of the aforementioned issues.

4.13     The Purchaser shall not exercise its rights under the Relationship
         Agreement so as to detrimentally affect an expedient settlement of the
         issues referred to in Article 4.12.

4.14     Any Indebtedness (actual or contingent) incurred by any of the ComTel
         Companies or members of the Telecential Group after the ComTel
         Completion Date with the consent, or at the direction of the Purchaser
         pursuant to the Relationship Agreement shall not qualify as
         Indebtedness for the purposes of Article 5.3.1(e)


ARTICLE 5     ACTIONS AT COMTEL COMPLETION AND ACTIONS AT TELECENTIAL COMPLETION

5.1           At ComTel Completion, once the sum of GBP 275.000.000 (two hundred
              and seventy five million Pounds Sterling) shall have been received
              in the bank account indicated in Article 4.2, the following
              actions shall take place in the sequence set out below, which
              actions shall be deemed to take place simultaneously, and each
              such action being conditional upon all such actions being
              effected:

5.1.1         ComTel shall deliver to the Purchaser:

              (a)   duly executed transfers of the ComTel Shares by the
                    registered holders in favour of the Purchaser or nominees of
                    the Purchaser, the share certificates and any additional
                    documentation necessary to establish the relevant
                    transferor's title to the ComTel Shares, to authorise the
                    executions of such transfers and to allow the transferees
<PAGE>   10
                                       10


                    (subject to due stamping) to be registered in the registers
                    of members of the ComTel Companies as holders of the ComTel
                    Shares;

              (b)   resignation letters substantially in the form of Schedule V
                    from all of the directors and company secretaries of the
                    ComTel Companies;

              (c)   an unqualified letter of resignation from the auditors of
                    each of the ComTel Companies which shall be in the form
                    prescribed by Section 394, Companies Act 1985;

              (d)   all other property, including any Relevant Assets, in the
                    possession of any member of the Seller's Group which is the
                    property of any of the ComTel Companies including but not
                    limited to correspondence and records thereof which
                    property, for the purposes hereof, is deemed transferred by
                    execution of this Agreement;

              (e) evidence reasonably satisfactory to the Purchaser that:

                     (i)    any guarantees granted or security or indemnities
                            given by any of the ComTel Companies in respect of
                            obligations of any member of the Seller's Group or
                            any member of the Telecential Group have been
                            released or discharged;

                     (ii)   the Bond Issue has been withdrawn without any
                            liability accruing to any of the ComTel Companies or
                            any member of the Telecential Group;

                     (iii)  all Indebtedness of the ComTel Companies (other than
                            (i) Indebtedness owed to another ComTel Company and
                            (ii) the lease between ComTel Coventry Limited and
                            Broadband Ventures Limited) has been cancelled or
                            extinguished in full;

                     and a certificate from the Seller to the Purchaser
                     confirming satisfaction of the foregoing matters based upon
                     Schedule Ind shall be accepted by the Purchaser, in the
                     absence of any evidence to the contrary, as prima facie
                     evidence satisfactory to the Purchaser;

              (f)    the Relationship Agreement in the form contained in
                     Schedule M duly executed by the parties (other than the
                     Purchaser) thereto; and

              (g)    duly stamped transfers of the ComTel Shares previously held
                     by VNUK in favour of ComTel.

5.1.2         The Seller shall deliver to the Purchaser the legal opinion from
              Stikeman, Elliott in the form contained in Schedule J.

5.1.3         NTL shall deliver to the Seller the legal opinion of Skadden Arps
              Slate Meagher & Flom LLP in the form contained in Part 1 of
              Schedule K and the Purchaser shall deliver to the Seller the
              Relationship Agreement in the form contained in Schedule M duly
              executed by the Purchaser.

5.1.4         The Purchaser shall confirm to ComTel that the amounts received
              from the Purchaser pursuant to Article 4.2 of this Agreement are
              held irrevocably to the order of ComTel and receipt of such
              confirmation shall constitute final discharge of payment of such
              sum and the Purchaser shall have no further concern as to the
              distribution of such monies.
<PAGE>   11
                                       11


5.2           Immediately following ComTel Completion, ComTel shall procure the
              holding of a meeting of the board of directors of each of the
              ComTel Companies at which meetings board resolutions in the form
              set out in Schedule B shall be passed.

5.3           At Telecential Completion, once the sum of GBP 200.000.000 (two
              hundred million Pounds Sterling) (as adjusted pursuant to Articles
              3.3, 4.11, 6.8 and 6.9) shall have been received in the bank
              account designated in Article 4.4 of this Agreement, the following
              actions shall take place in the sequence set out below, which
              actions shall be deemed to take place simultaneously, and each
              such action being conditional upon all such actions being
              effected:

5.3.1         The relevant Transferors shall deliver to the Purchaser:

              (a)    duly executed transfers of the ComTel Limited Shares and
                     the Heartland Shares by the registered holders in favour of
                     the Purchaser or its nominees, the share certificates and
                     any additional documentation necessary to establish the
                     relevant transferor's title to the ComTel Limited Shares
                     and the Heartland Shares, to authorise the executions of
                     such transfers and to allow the transferee(s) (subject to
                     due stamping) to be registered in the registers of members
                     of ComTel Limited, Heartland Cablevision (UK) Limited and
                     Heartland Cablevision II (UK) Limited as holders of such
                     shares;

              (b)    resignation letters substantially in the form of Schedule V
                     from all the directors and company secretaries of all the
                     companies within the Telecential Group (other than those
                     appointed by Pirunico Trustees (Jersey) Limited);

              (c)    an unqualified letter of resignation from the auditors of
                     each of the companies in the Telecential Group and of each
                     of the Telecential Partnerships which shall be in the form
                     prescribed by Section 394, Companies Act 1985;

              (d)    all other property including any Relevant Assets in the
                     possession of the Transferors or any other member of the
                     Seller's Group which is the property of any member of the
                     Telecential Group, including but not limited to
                     correspondence and records thereof;

              (e) evidence reasonably satisfactory to the Purchaser that:

                     (i)    any guarantees granted or security or indemnities
                            given by any member of the Telecential Group in
                            respect of obligations of any member of the Seller's
                            Group have been released or discharged;

                     (ii)   all Indebtedness of the Telecential Group (other
                            than any Indebtedness of the kind referred to in
                            Article 4.14) has been repaid in full;

                     and a certificate from the Seller to the Purchaser
                     confirming satisfaction of the foregoing matters shall be
                     accepted by the Purchaser, in the absence of any evidence
                     to the contrary, as prima facie evidence satisfactory to
                     the Purchaser. The Purchaser shall be considered to have
                     accepted the certificate in respect of Indebtedness in
                     existence at that date without reservation if the Seller
                     shall have sent a copy of such certificate to the Purchaser
                     not less than 10 (ten) Business Days prior to the
                     Telecential Completion Date and the Purchaser has not
                     notified the Seller to the
<PAGE>   12
                                       12


                    contrary, setting out in detail what Indebtedness remains to
                    be dealt with within 5 (five) Business Days of the receipt
                    of such notice or 5 (five) Business Days prior to the
                    Telecential Completion Date (whichever is the later);

              (f)   duly signed Forms 53 and Forms 403a in respect of the
                    charges in favour of The Chase Manhattan Bank N.A., London
                    Branch, remaining on the Land Registry and the Register of
                    Companies.

5.3.2         Canco 1 and UKI shall procure that the Purchaser and/or its
              nominee(s) are assumed as general partners of the Telecential
              Communications Partnership (and by virtue thereof, as general
              partners of the Telecential Communications (Herts) Partnership and
              the Telecential Communications (Northants) Partnership) in place
              of Canco 1 and UKI which shall retire as partners of the same and
              for the purposes of effecting the same, Canco 1 and UK1 and the
              Purchaser and/or its nominee(s) shall enter into deeds of
              retirement and appointment in the forms contained in Schedule O.

5.3.3         Canco 3 and UKII shall procure that the Purchaser and/or its
              nominee(s) are assumed as managing general partner and a limited
              partner of LP5 in place of Canco 3 and UKII respectively which
              shall retire as partners of LP5 and for the purposes of effecting
              the same, Canco 3 and UKII and the Purchaser and/or its nominee(s)
              shall enter into a deed of retirement and appointment in the form
              contained in Schedule P.

5.3.4         Canco 3 and VNUK shall procure that the Purchaser and/or its
              nominee(s) are assumed as managing general partner and a limited
              partner of LP6 in place of Canco 3 and VNUK which shall retire as
              partners of LP6 and for the purposes of effecting the same, Canco
              3 and VNUK and the Purchaser and/or its nominee(s) shall enter
              into a deed of retirement and appointment in the form contained in
              Schedule Q.

5.3.5  The Purchaser shall:

              (a)    confirm to the Seller and the Transferors in terms
                     reasonably satisfactory to the Seller that the amounts
                     received from the Purchaser pursuant to Article 4.4 of this
                     Agreement are held irrevocably to their order and receipt
                     of such confirmation shall constitute final discharge of
                     payment of such sum to the Seller and the relevant
                     Transferors and the Purchaser shall have no further concern
                     as to the distribution of such monies;

              (b)    procure that NTL shall take all such action as shall be
                     necessary to validly create, constitute and issue to the
                     Seller, at par the Purchaser Security having a principal
                     amount due on redemption equal to the US dollar equivalent
                     of GBP 75,000,000 (and for this purpose, the calculation of
                     the US dollar equivalent shall be the average of the two
                     highest and the two lowest figures of the spot rate of
                     exchange of The Chase Manhattan Bank for the purchase of
                     pound sterling with US$ on or about 11.00 am. over the ten
                     Business Days' prior to the Telecential Completion Date;
                     and

              (c)    deliver to the Seller the legal opinion of Skadden, Arps,
                     Slate, Meagher and Flom LLP in the form (or substantially
                     in the form) set out in Part 2 of Schedule K.

5.3.6         Immediately following Telecential Completion, the Seller shall
              procure the holding of a meeting of the Board of Directors of each
              of the companies within the Telecential Group at which meetings
              Board Resolutions in the form set out in Schedule B shall be
              passed.
<PAGE>   13
                                       13


5.4           If the consent or agreement of any third party is required to the
              transfer of the benefit and all other rights and liabilities in
              connection with any Relevant Asset which consent has not been
              obtained at or prior to the ComTel Completion Date or the
              Telecential Completion Date, as the case may be, the transfer of
              the Relevant Asset shall notwithstanding ComTel Completion or
              Telecential Completion (as the case may be) be conditional upon
              that/those consent(s) or agreement(s), and the Seller and/or the
              relevant Transferor and the Purchaser shall use all reasonable
              endeavours to obtain it/them as soon as possible but such
              conditional transfer shall not delay or prevent the ComTel
              Completion or Telecential Completion (as the case may be) taking
              place.

5.5           After the ComTel Completion Date or the Telecential Completion
              Date, as the case may be, and until such time as that consent or
              agreement referred to in Article 5.4 is obtained and the full
              benefit of the Relevant Asset transferred to the Purchaser (or its
              nominee(s)), the relevant Transferor shall be deemed to hold the
              benefit of the Relevant Asset in trust for the Purchaser (or such
              nominee(s)).

5.6           As from the ComTel Completion Date or Telecential Completion Date
              (as the case may be), the Purchaser shall (or shall procure that
              such of its nominee(s) as may be the transferee(s) of the Relevant
              Asset) perform any outstanding obligations (if any) of the
              relevant Transferor in respect of the Relevant Asset provided that
              subject to the provisions of the Relationship Agreement, nothing
              contained in this Agreement shall make the Purchaser (or its
              nominee(s)) liable for any act, neglect, default or omission of
              the relevant Transferor in respect of the Relevant Asset occurring
              prior to ComTel Completion or Telecential Completion (as the case
              may be).

5.7           The Seller, Canco 1 and Canco 3 agree with the Purchaser as
              trustee for and on behalf of, and for the benefit of, ComTel
              Limited that the management services agreements dated 30 April
              1993 entered into between ComTel Limited (on the one part) and
              Canco 1 and Canco 3 respectively (on the other part) shall
              terminate without any liability of ComTel Limited to either Canco
              1 or Canco 3 thereunder with effect from Telecential Completion.

5.8           Each Party will, at the reasonable request of the other Party,
              execute all other documents and take all other actions as may be
              reasonably required to give effect to their common intention as
              set out in this Agreement. Without prejudice to the foregoing, the
              Seller, UKI, UKII, Canco 1 and Canco 3 covenant with the Purchaser
              (for itself and as trustee for such of its nominee(s) as may be
              assumed as partners of the Telecential Communications Partnership,
              LP5 and/or LP6 at Telecential Completion in accordance with this
              Agreement) that the Seller, UKI, UKII, Canco 1 and Canco 3 will
              from time to time at the reasonable request of the Purchaser or
              such nominee(s) execute and do such deeds, acts and things and
              join with the Purchaser and/or such nominee(s) in such actions and
              proceedings as may be requisite for recovering the book debts of
              such partnerships and obtaining possession of the assets of such
              partnerships.


ARTICLE 6     COMPLETION BALANCE SHEET

6.1      Immediately following the ComTel Completion Date, the Seller will, at
         its own cost, instruct the Seller's Accountant to prepare a draft pro
         forma consolidated balance sheet (hereinafter referred to as the
         "Completion Balance Sheet") for the ComTel Companies and the members of
         the Telecential Group as of the close of business on the ComTel
         Completion Date (on a going
<PAGE>   14
                                       14


         concern basis as though the Parties had not consummated the
         transactions contemplated by this Agreement), for the sole purpose of:

         (i)      establishing whether the amount of the aggregate Net Asset
                  Value as set forth in the Completion Balance Sheet (as finally
                  determined pursuant to the provisions of this Article 6) is
                  lower than the amount of the aggregate Net Asset Value as of
                  the Balance Sheet Date taking into account Capital
                  Contributions and budget net loss between the Balance Sheet
                  Date and the ComTel Completion Date;

         (ii)     establishing the total amount of Indebtedness outstanding as
                  of the ComTel Completion Date for the members of the
                  Telecential Group;

         (iii)    establishing a list of each of the agreements corresponding to
                  (ii) with the corresponding amounts outstanding as of the
                  ComTel Completion Date;

         (iv)     establishing the total amount of cash and equivalents in hand
                  or at bank as of the ComTel Completion Date for the ComTel
                  Companies and the members of the Telecential Group.

6.2      Subject to final determination of the Completion Balance Sheet as set
         out in this Article 6, the Purchase Price shall be adjusted by the
         amount of the Purchase Price Adjustment ("PPA") to reflect the
         difference in the amount of the Net Asset Value according to the
         following formula:







         NAV (cc) - CC + (NL(b) x AD/365) - NAV (aa)

         and whereby the following shall apply:

                  NAV(aa)           is the Net Asset Value as shown in the Net
                                    Asset Statement in the amount of pound
                                    sterling 97,437,000;

                  CC                are the Capital Contributions made by any
                                    member of the Seller's Group to the ComTel
                                    Companies and the members of the Telecential
                                    Group between 1 January 1998 and the ComTel
                                    Completion Date;

                  AD                means  the  actual  number  of  days  from
                                    1  January  1998  to the  ComTel Completion
                                    Date (both dates inclusive);

                  NAV(cc)           is the Net Asset Value as shown in the
                                    Completion Balance Sheet; and

                  NL(b)             is the Budget 1998 Net Loss in the amount
                                    of pound sterling 43,414,000.

6.2.1    If the Purchase Price Adjustment as finally determined results in an
         amount which is less than zero, the amount equal to the shortfall will
         be treated as a claim for a Breach for all purposes and, subject to
         Articles 9.6 and 9.7, the Seller shall pay to the Purchaser an amount
         equal to the shortfall within 5 (in words : five) Business Days after
         the date on which the Completion Balance Sheet has been finally
         determined pursuant to the provisions of this Article 6.
<PAGE>   15
                                       15


6.2.2    If the Purchase Price Adjustment results in an amount which is more
         than zero, no amount shall be payable by the Purchaser to the Seller.

6.2.3    Payments pursuant to the foregoing provisions of this Article 6.2 shall
         be made in immediately available funds to such bank account as the
         Purchaser may notify to the Seller in accordance with this Agreement.
         Any actual reduction in the Purchase Price pursuant to this Article 6
         resulting in a payment being made by the Seller shall, in the absence
         of any agreement between the Purchaser and the Seller to the contrary,
         be deemed to reduce the Purchase Price for each of the Assets as shown
         in Schedule A on a pro-rata basis.

6.3      The Seller's Accountant shall prepare the draft Completion Balance
         Sheet by preparing a consolidated balance sheet for each of the ComTel
         Companies and members of the Telecential Group on the basis of the
         generally accepted accounting principles consistently applied by the
         ComTel Companies and the Telecential Group in preparing the Annual
         Accounts and by combining them in accordance with the same principles
         applied to the aggregate Net Asset Value as per the Net Asset
         Statement. Provision for Taxes (including the calculation of capital
         allowances) shall be made on the basis of a tax accounting period from
         1 January 1998 to the ComTel Completion Date. The Purchaser shall
         procure that the ComTel Companies shall provide as and when reasonably
         requested, full co-operation to the Seller's Accountant including but
         not limited to access to the corporate books and records and management
         of the ComTel Companies (subject to any confidentiality obligations
         owed to third parties).

6.4      The draft Completion Balance Sheet must (and the Seller shall procure
         that the same shall) be completed as soon as reasonably possible but in
         any event within 70 (in words : seventy) days from the ComTel
         Completion Date. The Seller shall procure that the Seller's Accountant
         submits the draft Completion Balance Sheet to the Seller and the
         Purchaser within 80 (in words : eighty) days from the ComTel Completion
         Date (such date of submission being hereinafter the "First Date")
         together with a written confirmation from the Seller's Accountant to
         the Seller and the Purchaser that the Completion Balance Sheet has been
         prepared in accordance with this Article 6.

6.5      The Purchaser shall be entitled to instruct the Purchaser's Accountant
         to review the draft Completion Balance Sheet as prepared by the
         Seller's Accountant. The Seller shall provide, and shall (so far as it
         is reasonably able) procure that the Seller's Accountant and members of
         the Telecential Group shall provide as and when reasonably requested,
         full co-operation to the Purchaser's Accountant, including but not
         limited to the provision of copies of (subject to the consent of the
         Seller's Accountant (not to be unreasonably withheld) which the
         Purchaser acknowledges may require the execution by it and/or the
         Purchaser's Accountant of a "hold harmless" letter in favour of the
         Seller's Accountant) the Seller's Accountants' working papers and
         corporate books and records and access to the management and the
         members of the Telecential Group (subject to any confidentiality
         obligations owed to third parties). If there are any objections to the
         draft Completion Balance Sheet, the Purchaser must (and the Purchaser
         shall procure that the Purchaser's Accountant shall) confirm this in
         writing (setting out the objections, if any) to the Seller within 60
         (in words: sixty) days from the First Date (such date of written
         confirmation of the Purchaser's Accountant hereinafter referred to as
         the "Second Date"). The Seller and the Purchaser shall consult with
         each other and use their reasonable endeavours to seek agreement in
         writing on (the) issue(s) in dispute within 30 (in words: thirty) days
         from the Second Date.

         If the Purchaser shall have failed to have confirmed any objections to
         the draft Completion Balance Sheet by the date following 60 (in words:
         sixty) days from the First Date, the Purchaser
<PAGE>   16
                                       16


         shall be deemed to have agreed the draft Completion Balance Sheet on
         such date for the purposes of this Article 6.

6.6      If the Seller and the Purchaser shall not be able to resolve the
         issue(s) in full within 30 (in words : thirty) days from the Second
         Date, the Seller and the Purchaser will jointly select a large
         independent accounting firm of international standing (hereinafter
         referred to as the "Independent Accountant") mutually acceptable to
         them to determine the issues in dispute. In the event that the Seller
         and the Purchaser are unable to agree (if required) in writing on the
         choice of the Independent Accountant within 45 (in words : forty-five)
         days from the Second Date, the Independent Accountant will be appointed
         by the President of the Institute of Chartered Accountants in England
         and Wales on the application by either the Purchaser or the Seller.
         Such appointment shall be binding on the Parties.

6.7      The Independent Accountant shall act as an expert but not as
         arbitrator. The Independent Accountant's final determination of the
         Completion Balance Sheet shall be binding on the Parties. The costs of
         the Independent Accountant shall be borne by the Party or Parties as
         the Independent Accountant shall determine, taking into account which
         of the Parties has prevailed in the dispute, but in the absence of such
         determination shall be borne equally by the Seller and the Purchaser.

6.8      The total amount of cash and equivalents in hand or at bank as shown in
         the Completion Balance Sheet shall be an increase to the cash element
         of the Purchase Price to be paid by the Purchaser on the Telecential
         Completion Date but there shall be deducted therefrom (and if necessary
         from the cash element of the Purchase Price) the cost (net of any
         associated credit note) of the acquisition of any relevant asset to the
         Purchaser or any subsidiary of the Purchaser in the event that the
         Purchaser or such subsidiary acquires such asset from a third party
         which was a lessor of such asset to a ComTel Company or member of the
         Telecential Group in connection with the prepayment or termination of
         any financial lease which constituted Indebtedness (the "Cash
         Adjustment").

6.9      To the extent that any member of the Telecential Group makes, at the
         Purchaser's election, a payment to the lessor in respect of the
         termination and/or cancellation of the lease between British
         Telecommunications plc and Swindon Cable Limited, the Purchase Price
         payable in cash on the Telecential Completion Date shall be increased
         by an amount equal to the book value of the liability of such lease as
         per the Completion Balance Sheet (the "Swindon Adjustment"). Unless the
         Purchaser notifies the Seller to the contrary within 15 Business Days'
         of the date hereof, it shall be deemed to have elected for the
         prepayment of such lease.

ARTICLE 7         DUE DILIGENCE, WARRANTIES AND ACKNOWLEDGEMENTS

         Due diligence investigation by the Purchaser

7.1      The documents and written information made available to the Purchaser
         during the due diligence investigation with respect to the ComTel
         Companies and the Telecential Group are listed in the Data Room
         Information as attached hereto as Schedule I.

         Warranties by the Seller and the Transferors

7.2.1    Subject to the provisions of this Article 7 and in consideration of the
         Purchaser agreeing to purchase the ComTel Companies and the Telecential
         Assets and except as otherwise disclosed to the Purchaser in the Data
         Room Information, (i) the Seller and the Transferors represent and
         warrant to the Purchaser that to the best of the Seller's knowledge and
         subject as mentioned in
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                                       17


         Article 7.10, the disclosed information relating to the ComTel
         Companies and the Telecential Group set out in Schedule I is not
         misleading in any material respect at the date of this Agreement and
         (ii) the Seller and the Transferors represent and warrant to the
         Purchaser that, other than as fairly disclosed in the Data Room
         Information referred to in Schedule I, each and every statement set out
         in Schedule R to this Agreement is true and correct at the date of this
         Agreement.

7.2.2    Subject to the provisions of this Article 7, and in consideration of
         the Purchaser agreeing to purchase the Telecential Assets from the
         relevant Transferors, the Seller and the Transferors represent and
         warrant to the Purchaser that, other than as fairly disclosed in the
         Data Room Information referred to in Schedule I, to the extent
         applicable to the Telecential Assets, each and every statement set out
         in paragraphs A1, A2 (first sentence), B1, B2, C1, C2, C3, N1, N2, N3,
         N4 and N5 of Schedule R to this Agreement will be true and correct
         immediately prior to Telecential Completion by reference to the facts
         and circumstances then subsisting.

7.3      For the purposes of the representation and warranty given by UKI in
         Article 7.2:-

7.3.1    references to any member of the Telecential Group which is a
         partnership shall be deemed to refer to the Telecential Communications
         Partnership, the Telecential Communications (Herts) Partnership and the
         Telecential Communications (Northants) Partnership only;

7.3.2    references to any ComTel Company or member of the Telecential Group
         which is a company shall be deemed to refer to Maza Limited, Herts
         Cable Limited, Northampton Cable Television Limited, Swindon Cable
         Limited, Cable Thames Valley Limited, Berkhampstead Properties &
         Building Contractors Limited, Cable Television Limited and Bracknell
         Cable TV Limited only;

7.3.3    references to any shares shall be deemed to refer to the shares in the
         companies referred to in Article 7.3.2; and

7.3.4    UKI shall not give any representation or warranty under Article 7.2 in
         respect of any of the other ComTel Companies or members of the
         Telecential Group.

7.4      For the purposes of the representation and warranty given by Canco 1 in
         Article 7.2:-

7.4.1    references to any member of the Telecential Group which is a
         partnership shall be deemed to refer to the Telecential Communications
         Partnership, the Telecential Communications (Herts) Partnership and the
         Telecential Communications (Northants) Partnership only;

7.4.2    references to any ComTel Company or member of the Telecential Group
         which is a company shall be deemed to refer to ComTel Limited, Maza
         Limited, Herts Cable Limited, Northampton Cable Television Limited,
         Swindon Cable Limited, Cable Thames Valley Limited, Berkhampstead
         Properties & Building Contractors Limited, Cable Television Limited and
         Bracknell Cable TV Limited only;

7.4.3    references to any shares shall be deemed to refer to the shares in the
         companies referred to in Article 7.4.2; and

7.4.4    Canco 1 shall not give any representation or warranty under Article 7.2
         in respect of any of the other ComTel Companies or members of the
         Telecential Group.

7.5      For the purposes of the representation and warranty given by UKII in
         Article 7.2:-
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                                       18


7.5.1    references to any member of the Telecential Group which is a
         partnership shall be deemed to refer to LP5 only;

7.5.2    UKII shall not give any representation or warranty under Article 7.2 in
         respect of any of the ComTel Companies or the other members of the
         Telecential Group.

7.6      For the purposes of the representation and warranty given by VNUK in 
         Article 7.2:

7.6.1    references to any member of the Telecential Group which is a
         partnership shall be deemed to refer to LP6 only;

7.6.2    references to any ComTel Company or member of the Telecential Group
         which is a company shall be deemed to refer to Heartland Cablevision
         (UK) Limited and Heartland Cablevision II (UK) Limited;

7.6.3    references to any shares shall be deemed to refer to the shares in the
         companies referred to in Article 7.6.2; and

7.6.4    VNUK shall not give any representation or warranty under Article 7.2 in
         respect of any of the other ComTel Companies or members of the
         Telecential Group.

7.7      For the purposes of the representation and warranty given by Canco 3 in
         Article 7.2:-

7.7.1    references to any member of the Telecential Group which is a
         partnership shall be deemed to refer to LP5 and LP6 only;

7.7.2    references to any ComTel Company or member of the Telecential Group
         which is a company shall be deemed to refer to Heartland Cablevision
         (UK) Limited and Heartland Cablevision II (UK) Limited;

7.7.3    references to any shares shall be deemed to refer to the shares in the
         companies referred to in Article 7.7.2; and

7.7.4    Canco 3 shall not give any representation or warranty under Article 7.2
         in respect of any of the other ComTel Companies or members of the
         Telecential Group.

         Acknowledgements by the Purchaser

7.8      The Purchaser acknowledges that it has performed a due diligence
         investigation with respect to the ComTel Companies and the Telecential
         Assets.

7.9      The Purchaser acknowledges that the Warranties given by the Seller and
         the Transferors are the only representations, warranties or other
         assurances of any kind given by or on behalf of the Seller and the
         Transferors on which the Purchaser may rely (and has relied) in
         entering into this Agreement. Each of the Parties waives all rights and
         remedies which, but for this Article 7.9, might otherwise be available
         to him in respect of any other such representation, warranty, or other
         assurance, provided that nothing in this Article 7.9 shall limit or
         exclude any liability for fraud.

7.10     Save in the case of fraudulent misrepresentation, the Purchaser agrees
         that no forward looking statement, estimate, promise or forecast, other
         than those specifically referred to in this Agreement or the Schedules
         made by or on behalf of the Seller or any of the Transferors, any of
<PAGE>   19
                                       19


         the ComTel Companies, any member of the Telecential Group or any of its
         or their respective directors, officers, agents or professional
         advisors shall form the basis of any claim by the Purchaser in
         connection with this Agreement. The only warranty whatsoever given in
         this Agreement with respect to any such forward looking statement,
         estimate, promise or forecast shall be that such statement, promise or
         forecast is to the best knowledge of the Seller honestly held and
         believed to be true by the person so making it.

7.11     Any claim in respect of a Breach or Non-Fulfilment (as defined in
         Article 9.1) shall, except in the case of fraudulent misrepresentation,
         be subject to the provisions of Article 9 hereof (save as otherwise
         expressly provided herein).

7.12     At the time of entering into this Agreement and after having concluded
         the due diligence investigation referred to in this Article 7, the
         Purchaser is not aware of any matter or thing which is inconsistent
         with the Warranties given by the Seller and the Transferors at the date
         of this Agreement.

7.13     Each of the Warranties shall be separate and independent and, save as
         expressly provided, shall not be limited by reference to any other
         Warranty or any other provision in this Agreement, provided however
         that the principle of general disclosure as set out in Article 7.2
         shall continue to prevail.

7.14     The Seller and the Transferors shall not and shall subject to the fact
         that the Purchaser has management control over the Telecential Assets
         with effect from ComTel Completion under the terms of the Relationship
         Agreement, exercise best endeavours to ensure that each member of the
         Telecential Group shall not do, allow or procure any act or omission on
         or before the Telecential Completion Date which would constitute a
         Breach of the Warranties being deemed given pursuant to Article 7.2.2
         by the Seller and the relevant Transferors at the Telecential
         Completion Date by reference to the facts and circumstances then
         subsisting.

7.15     The Seller and the Transferors undertake to the Purchaser to disclose
         to it in writing, as soon as possible upon becoming aware of the same,
         reasonable details of any fact, matter, event or circumstance which:

         (a)      constitutes  a  Breach  of  any  of the  Warranties  given
                  by  the  Seller  or the  relevant Transferors upon the
                  execution of this Agreement;

         (b)      will constitute a Breach of any of the Warranties when deemed
                  given pursuant to Article 7.2.2 by the Seller or the relevant
                  Transferors at the Telecential Completion Date; or

         (c)      will give rise to a claim under the provisions contained in
                  Schedule T.

7.17     The Seller undertakes not to, and to procure that no member of the
         Seller's Group shall, exercise any right of counterclaim or set-off or
         any other claim or right of recovery against any of the ComTel
         Companies or any member of the Telecential Group or any of their
         respective officers, employees or, where such auditors or advisers
         would be entitled to so counterclaim against any of the ComTel
         Companies or members of the Telecential Group or any of their
         respective officers or employees, auditors or advisers of the ComTel
         Companies or members of the Telecential Group in relation to any claim
         which may be made in respect of the Warranties given by the Seller or
         the provisions contained in Schedule T.
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                                       20


ARTICLE 8     WARRANTIES OF THE PURCHASER AND NTL

8.1      Each of the Purchaser and NTL represents and warrants to the Seller
         that at the date of this Agreement and on the ComTel Completion Date
         each and every statement set out below, is true and correct and will
         continue to be true and correct at the ComTel Completion Date:

8.1.1    The Purchaser is a company duly organised and validly existing under
         the laws of England and Wales. NTL is a company duly organised and
         validly existing under the laws of the State of Delaware, USA. Neither
         the Purchaser nor NTL is insolvent nor is any action or request pending
         to declare the Purchaser or NTL insolvent and no request has been filed
         for a moratorium or suspension of payments by the Purchaser or NTL or
         any similar arrangement for the benefit of creditors nor has the same
         been granted.

8.1.2    Each of the Purchaser and NTL has the corporate power to enter into
         this Agreement and to perform its obligations hereunder. This Agreement
         constitutes and the Purchaser Security (in the case of NTL) will upon
         issue constitute, the legal, valid and binding obligations of the
         Purchaser and of NTL enforceable against the Purchaser or NTL (as the
         case may be) in accordance with its terms, subject to laws relating to
         constitutional rights generally and general principles of equity.

8.1.3    The execution of and entering into this Agreement and the consummation
         of the transactions contemplated hereby (including without limitation
         the creation and issue of the Purchaser Security in accordance with
         this Agreement) by the Purchaser and NTL has been duly or will be
         authorised by all necessary corporate and other action applicable to
         the Purchaser and NTL. The individuals executing this Agreement on
         behalf of the Purchaser and NTL are duly authorised to do so.

8.1.4    The execution of and entering into this Agreement, and the consummation
         of the transactions contemplated hereby, subject to the Seller
         complying with its obligations hereunder in connection with the
         discharge of all Indebtedness of the ComTel Companies on the ComTel
         Completion Date and the Telecential Group on the Telecential Completion
         Date, and the Purchaser Security (in the case of NTL) do not and will
         not (with or without the passage of time or the giving of notice) in
         any material respect violate or conflict with any provision of the
         Purchaser's memorandum or articles of association or NTL's by-laws, or
         violate or conflict with any law binding upon the Purchaser or NTL or
         any of their respective properties or assets or violate or conflict
         with, result in a breach of, or constitute a default under any
         agreement or other obligation to which the Purchaser or NTL is bound.

8.1.5    Except for the notifications to the DTI, ITC and OFTEL which the
         Purchaser has made prior to entering into this Agreement, no consent or
         approval of, or registration, notification, filing and/or declaration
         with, any court, government or governmental agency, stock exchange or
         self regulatory organisation is required to be given or made by the
         Purchaser or NTL in connection with the execution of and entering into
         this Agreement, and the consummation of the transactions and the other
         agreements and instruments contemplated hereby.

8.2      The Seller and the Purchaser mutually undertake to exercise their best
         efforts to agree, as soon as possible and no later than 15 (in words:
         fifteen) Business Days following the ComTel Completion Date, on the
         precise wording of the Purchaser Security, reflecting the main terms
         set out in Schedule S and with such corresponding provisions as are
         normal for the specific type of security agreed upon and necessary to
         make the Purchaser Security valid and enforceable under the laws of the
         State of Delaware, USA.
<PAGE>   21
                                       21

ARTICLE 9     BREACH AND NON-FULFILMENT

         Breach

9.1      In the event of a breach of any of the Warranties given by the Seller,
         the Transferors or the Purchaser in this Agreement (hereinafter
         referred to as a "Breach") or non-fulfilment by the Seller or the
         Transferors or the Purchaser of any other obligation contemplated by
         this Agreement (hereinafter, subject to Article 9.2, referred to as a
         "Non-Fulfilment"), the Seller, the Transferors or the Purchaser, as the
         case may be, shall upon obtaining knowledge of a Breach or
         Non-Fulfilment by any other Party, notify that other Party promptly in
         writing of such Breach or Non-Fulfilment, setting out in reasonable
         detail (so far as is within the actual knowledge (after reasonable
         enquiry) of the person making the notification but subject to any
         obligations of confidentiality owed to any third party) the events or
         facts giving rise to the Breach or Non-Fulfilment, and giving an
         estimate (to the extent reasonably possible) of the amount of damages
         claimed as a result thereof. Any failure by any Party to notify the
         other pursuant to this Article 9.1 and the content of any notification
         made pursuant hereto shall not in any way affect the right to bring a
         claim for a Breach or Non-Fulfilment.

9.2      The following shall be deemed not to fall within the definition of a
         Non-Fulfilment for the purposes of this Agreement (i) the Seller's and
         Transferors obligations contained in Article 11 (a "Tax Indemnity
         Claim"), (ii) the Seller's and Transferors' confidentiality obligations
         contained in Article 10 (a "Confidentiality Claim"), (iii) the Seller's
         and the Transferors' completion obligations contained in Articles 2, 5
         and 6 (a "Completion Claim"), (iv) the obligations contained in
         Articles 4.5 and 13 (an "Indebtedness Claim"), (v) the obligations
         contained in Article 15, (a "Minority Claim"), (vi) the obligations
         contained in Article 3 (a "Pre-Completion Claim"), such claims jointly
         the "Specific Claims". Article 9 shall not apply to Specific Claims
         other than where expressly provided for below. The following shall
         apply in relation to Specific Claims:

9.2.1    in respect of an Indebtedness Claim or a Completion Claim, the amount
         of all awards or damages awarded or agreed against the Seller and
         Transferors shall not in the aggregate exceed the equivalent of 100% of
         the Purchase Price, whereas for other Specific Claims the equivalent of
         50% of the Purchase Price shall apply;

9.2.2    in respect of Tax Indemnity Claims, Articles 9.6.1 and 9.6.2 shall
         apply and in respect of all Specific Claims, Article 9.10 shall apply;

9.2.3    in respect of Specific Claims, no party shall be entitled to make any
         claim unless notice in writing providing reasonable detail (subject to
         any confidentiality obligations owed to third parties) of such claim is
         given prior to the sixth anniversary of the ComTel Completion Date
         except in the case of a Pre-Completion Claim when such notice must be
         given prior to the date six months after the Telecential Completion
         Date.

[CLAUSE 9.3 DELIBERATELY DELETED]

9.4      If the notified Party has not taken appropriate measures within 30
         (thirty) days of such notification in order to remedy the Breach or
         Non-Fulfilment concerned and a dispute arises in this respect between
         the Parties or where the Breach is not remediable, the resolution of
         the dispute will immediately be brought in writing to the attention of
         the respective Chief Executive Officers of the Seller and the Purchaser
         in an attempt to resolve the dispute amicably and written reports
         concerning such dispute shall be submitted by each of the relevant
         Parties to the said officers.
<PAGE>   22
                                       22


9.5      In the event that the dispute is not resolved amicably in accordance
         with Article 9.4 within 30 (thirty) days of having been brought in
         writing to the attention of the respective Chief Executive Officers,
         any of the applicable Parties shall be entitled to institute legal
         proceedings against the other(s) in respect of such dispute.

9.6      Subject to the other provisions of this Article 9, the maximum
         aggregate liability of the Seller and the Transferors for damages in
         connection with any Breach or any Non-Fulfilment shall be limited to
         the amount required to put the Purchaser and/or the relevant ComTel
         Company and/or the relevant member of the Telecential Group (as
         appropriate) in the position in which it and/or they would have been if
         the relevant Breach or Non-Fulfilment had not occurred.

         Threshold

9.6.1    A claim (in the amount as finally determined by virtue of a judgement
         of a court of competent jurisdiction or agreed between the relevant
         Parties) against the Seller and/or the Transferors for damages and
         related costs in connection with a Breach or Non-Fulfilment shall not
         be permitted for any individual claim in an amount below the equivalent
         in Pounds Sterling at the average of the two highest and two lowest
         figures of the spot rate of exchange of Chase Manhattan Bank NA. for
         the purchase of pound sterling Sterling with Dutch Guilders at the
         ComTel Completion Date of NLG 1,000,000 (one million Dutch Guilders);
         and

9.6.2    In any event, the aggregate amount of all claims for Breaches,
         Non-Fulfilment, Specific Claims (and/or claims under Article 6 (as
         finally determined by virtue of a judgement of a court of competent
         jurisdiction or agreed between the Parties in excess of the limit in
         Article 9.6.1 above (from time to time)) must exceed the equivalent in
         Pounds Sterling at the average of the two highest and two lowest
         figures of the spot rate of exchange of Chase Manhattan Bank NA. for
         the purchase of pound sterling with Dutch Guilders at the ComTel
         Completion Date of NLG 17,500,000 (seventeen million five hundred
         thousand Dutch Guilders) before a claim may be lodged in which event
         the Purchaser shall be entitled, if successful, (subject to the other
         provisions of this Article 9) to the full amount of the aggregate of
         all such claims in excess of the limit in this Article 9.6.2 and not
         only to such excess.

         Warranty Cap

9.7      In any event, the amount of all awards or damages awarded or agreed
         against the Seller or any Transferor(s) for any and all Breaches and/or
         Non-Fulfilments (subject to Article 9.2; Specific Claims) shall not in
         the aggregate exceed the equivalent of fifty percent of the Purchase
         Price.

         Time Limit

9.8      The Purchaser shall not be entitled to make any claim against the
         Seller or any Transferor for any Breach or Non-Fulfilment unless notice
         in writing of such claim (giving reasonable details of such claim) is
         given to the Seller prior to the first anniversary of the ComTel
         Completion Date, or in the case of any Warranties given by the Seller
         and the Transferors by reference to the Telecential Completion Date and
         any obligations falling to be discharged at Telecential Completion
         unless notice in writing of such claim (giving reasonable details of
         such claim) is given to the Seller prior to the first anniversary of
         the Telecential Completion Date except for a claim for a Breach
         relating to Tax or a Tax Indemnity Claim, for which the Purchaser shall
         not be entitled to make any claim against the Seller unless notice in
         writing providing reasonable detail of such claim is given to the
         Seller prior to the sixth anniversary of the ComTel
<PAGE>   23
                                       23


         Completion Date (to the extent the claim relates to the ComTel Company)
         or Telecential Completion Date (to the extent the claim relates to the
         Telecential Group).

         Other Limitations

9.9      The Purchaser shall notify the Seller of any claim for a Breach or
         Non-Fulfilment within 30 (in words: thirty) days of becoming aware
         thereof. To the extent that any failure to so notify the Seller causes
         loss to the Seller or any Transferor or makes it impossible for the
         Seller or any Transferor to limit its damages, any loss suffered shall
         be off-set against the relevant claim from the Purchaser.

9.10     No claim by any Party for any Breach or Non-Fulfilment or otherwise
         shall arise in respect of any consequential or indirect damages or loss
         of profit and all claims shall be limited to damages actually suffered.

9.11     The Purchaser shall not be entitled to make any claim for any Breach or
         Non-Fulfilment to the extent that a specific provision for the matter
         or liability has been made in the Completion Balance Sheet, or to the
         extent that its payment or discharge is taken into account or reflected
         in the Completion Balance Sheet.

9.12     No claim by any Party for any Breach or Non-Fulfilment shall arise from
         any matter disclosed or otherwise exempted in or pursuant to this
         Agreement and the Schedules attached hereto.

9.13     No claim by any Party for any Breach or Non-Fulfilment shall arise to
         the extent that the claim arises as a result of (i) any change in the
         accounting principles applied by any of the ComTel Companies after
         ComTel Completion and/or members of the Telecential Group after
         Telecential Completion (as applicable) or (ii) any subsequent changes
         in applicable laws or regulations after ComTel Completion or
         Telecential Completion (as applicable), or (iii) a new interpretation
         of existing laws by a court or other public authority in a judgement or
         decision published after ComTel Completion or Telecential Completion
         (as applicable) with retrospective effect.

         Third Party Claims

9.14     If any claim of the Purchaser in connection with a Breach or
         Non-Fulfilment shall arise which would or is reasonably likely to
         entitle the Purchaser to receive a payment from the Seller or any
         Transferor under the terms of this Agreement (after taking into account
         the limitations of the liability of the Seller and the Transferors set
         out herein) and such claim is as a result of or in connection with a
         liability or alleged liability towards a third party, the Purchaser
         shall (i) as soon as reasonably practicable inform the Seller thereof
         (and of the relevant facts of the matter at hand so far as then known
         by the Purchaser but subject to any obligations of confidentiality owed
         to third parties) in writing prior to taking any action, and (ii) to
         the extent practicable in all the circumstances, not take any such
         action within 10 (in words: ten) Business Days of so informing the
         Seller in order to allow the Seller to decide on whether to exercise
         its rights under Article 9.16.

9.15     The Purchaser may, notwithstanding the foregoing, be entitled to take
         any necessary action before the expiry of the 10 (in words: ten)
         Business Day period in urgent cases where immediate action is required,
         provided that the Purchaser shall at all times consult (subject to any
         obligations of confidentiality owed to third parties) and endeavour to
         seek agreement with the Seller with regard to the actions to be taken
         to the extent reasonably possible.
<PAGE>   24
                                       24

9.16     Provided the Seller shall notify the Purchaser of its intention to
         exercise its rights under this Article 9.16 within 10 (ten) Business
         Days of receipt of a notification under Article 9.9, without prejudice
         to the Seller's liability to the Purchaser and subject to the Purchaser
         receiving such security as it may reasonably require in respect of any
         potential liability of the Seller under this Article 9.16 and for the
         particular Breach or Non-Fulfilment in question:

         (a)      the Seller shall (subject to complying with its obligations
                  under (d) below) be entitled, at its own expense, to have the
                  exclusive conduct of any appeal, dispute, compromise, or
                  defence of the dispute and of any incidental negotiations with
                  the third party giving rise to the particular Breach or
                  Non-Fulfilment, and the Purchaser shall (and shall procure
                  that the relevant ComTel Companies and members of the
                  Telecential Group shall), in each case at the expense of the
                  Seller, subject as aforesaid take such action to avoid,
                  dispute, resist, appeal, compromise or contest the liability
                  as may be reasonably requested by the Seller;

         (b)      the Purchaser shall procure that the Seller is provided, at
                  the expense of the Seller, with such information and
                  assistance as the Seller may reasonably require for avoiding,
                  resisting, appealing, compromising or contesting any such
                  liability;

         (c)      where the Seller has notified the Purchaser of its intention
                  to exercise its rights hereunder in accordance with this
                  Article 9.16 and is continuing to exercise such rights,
                  neither the Seller nor the relevant Transferor shall in any
                  circumstances be liable for any third party claim settled or
                  otherwise compromised, without its prior written consent (such
                  consent not to be unreasonably withheld or delayed); and

         (d)      the Seller shall keep the Purchaser informed of any action
                  which it takes pursuant to this Article 9.16.

9.17     Notwithstanding Article 9.16:

9.17.1   nothing contained therein shall permit the Seller in exercising its
         rights thereunder to do, or require the Purchaser or any of the ComTel
         Companies and/or members of the Telecential Group to do, anything which
         the Purchaser reasonably considers to be materially adverse to it or to
         the business of it or any of its subsidiaries (including the ComTel
         Companies and the Telecential Group); and

9.17.2   the Seller shall not be entitled to exercise any right under Article
         9.16 where to do so would require the disclosure to the Seller of any
         information the subject of confidentiality obligations owed to any
         third party.

9.18     If in respect of any matter which would otherwise give rise to a
         Breach, the Purchaser or any of the ComTel Companies or members of the
         Telecential Group is entitled to claim under any policy of insurance,
         the amount of insurance monies which such entity receives shall reduce
         pro rata the claim for Breach or Non-Fulfilment.

9.19     If in respect of any matter which would otherwise give rise to a Breach
         or Non-Fulfilment, the Purchaser or any of the ComTel Companies or the
         members of the Telecential Group is entitled to seek recourse against
         any third party, no claim may be made against the Seller or any
         Transferor before the Purchaser and/or the relevant ComTel Company
         and/or members of the Telecential Group has or have taken such
         reasonable action as may be required from it or them in the
         circumstances to effect recourse on such third party and the amount of
         monies recovered from such third party (less the costs of recovery and
         net of any tax payable on such amount)
<PAGE>   25
                                       25

         shall reduce pro rata the claim for such Breach or Non-Fulfilment
         PROVIDED THAT nothing in this Article 9.19 shall prevent the Purchaser
         giving notice of the particular Breach or Non-Fulfilment for the
         purposes of Article 9.9.

9.20     If the Seller or the Transferor has made a payment for damages in
         respect of a claim for Breach or Non-Fulfilment and the Purchaser or
         any of the ComTel Companies or members of the Telecential Group
         simultaneously therewith or subsequently thereto receives any cash
         benefit otherwise than from the Seller or the Transferor which would
         not have been received but for the circumstance giving rise to the
         claim in respect of which the payment for damages was made by the
         Seller or relevant Transferor, the Purchaser shall, once it or the
         relevant ComTel Company or member of the Telecential Group has received
         such benefit, forthwith repay to the Seller or relevant Transferor(s)
         an amount equal to the lesser of the amount of such benefit and the
         amount paid by the Seller or relevant Transferor(s) (net of any tax
         payable on such amount).

9.21     Any damages payable by the Seller under this Agreement shall take into
         consideration the tax effects to the Purchaser and/or the ComTel
         Companies and/or the members of the Telecential Group, or any of them,
         as applicable, so that damages will be "net after tax effect" only.

9.22     The Seller shall procure that Vision Networks Holdings B.V., promptly
         after its incorporation, shall provide a guarantee in writing to the
         Purchaser in the form attached as Schedule F.

9.23     The Seller covenants with the Purchaser in the same terms mutatis
         mutandis as NTL under Article 12.15, in respect of the obligations of
         the Transferors under or pursuant to this Agreement and the
         Relationship Agreement and any other agreement entered into by any of
         the Transferors and any other party on the date of this Agreement.

ARTICLE 10    SECRECY

10.1     Each of the Seller, the Transferors and the Purchaser mutually covenant
         and agree that it shall not (and shall procure that its subsidiaries
         and parent undertakings and the respective advisors, officers and
         members of its and their respective boards of managing directors and
         supervisory directors and directors of it and its subsidiaries and
         parent undertakings (each a "Restricted Person") shall not) at any time
         divulge, furnish or make accessible to anyone, and treat as strictly
         confidential, any confidential or secret knowledge or information with
         respect to the provisions of this Agreement and the negotiations
         relating to this Agreement or any other Party, provided always that the
         foregoing shall not apply (i) to information which is in the public
         domain other than as a result of any Party breaching its obligations
         hereunder, (ii) in any case where any of the Seller, the Transferors,
         the Purchaser or Restricted Person (or any of their advisors or
         officers) is required by law to divulge, furnish or make such
         information accessible, (iii) in the framework of compliance with
         requirements of any relevant Stock Exchange (including NASDAQ and
         EASDAQ) or regulatory or government body. The Purchaser shall exercise
         its best endeavours to procure that, following ComTel Completion, each
         of the ComTel Companies and, following Telecential Completion, each
         member of the Telecential Group shall comply with the foregoing
         provisions.

10.2     The Seller and the Transferors shall, and shall procure that the
         subsidiaries and parent undertakings shall, keep confidential and not
         at any time after the date of this Agreement disclose or make known in
         any way to anyone (other than the Purchaser) or use for its own or any
         other person's benefit any know-how or confidential information
         relating to any of the customers, suppliers or affairs of the
         businesses (including any prospective businesses) of the ComTel
         Companies or the members of the Telecential Group or otherwise relating
         to the businesses of the ComTel Companies or the members of the
         Telecential Group provided always
<PAGE>   26
                                       26

         that the foregoing shall not apply to information which is or comes
         into the public domain other than as a result of a breach by the Seller
         or any Transferor of its obligations hereunder. The obligations of the
         Parties under this Article 10.2 shall be subject to confidentiality
         obligations owed to third parties.

10.3     All records, papers and documents in the possession, custody or control
         of or kept or made by or on behalf of the Seller, the Transferors
         and/or any member of the Seller's Group relating to the business or
         affairs of any of the ComTel Companies or members of the Telecential
         Group or of which any of the ComTel Companies or members of the
         Telecential Group does not have a record or copy, shall be prima facie
         deemed to be the property of the relevant company or partnership and
         all such items shall be delivered to the relevant company or
         partnership at or as soon as possible after ComTel Completion (where
         they relate to the ComTel Companies) and Telecential Completion (where
         they relate to the Telecential Group).

ARTICLE 11    TAX AFFAIRS POST COMPLETION

11.1     To the extent this is reasonably required by the Seller and subject to
         the Seller complying with its obligations under Article 10.2 (save
         where that would unduly restrict the Seller in the conduct of its Tax
         affairs as hereafter said), the Purchaser shall procure that the ComTel
         Companies and the members of the Telecential Group shall, without undue
         delay, provide to the Seller such information and access to, and copies
         of, the corporate books and records of each of the ComTel Companies and
         the members of Telecential Group and the Purchaser, and provide such
         other assistance, at the expense of the Seller, (e.g. by making
         available employees to provide additional information and explanation
         of any materials so provided) as may reasonably be requested by the
         Seller, as being necessary or desirable to the Seller in properly
         fulfilling its obligations pursuant to Tax laws and regulations or
         otherwise dealing with tax affairs in respect of the periods prior to
         the relevant Completion Date but subject always to obligations of
         confidentiality owed to third parties.

11.2     If with respect to the period prior to the ComTel Completion Date in
         relation to the ComTel Companies or the Telecential Completion Date in
         relation to the Telecential Group, any of the ComTel Companies or any
         member of the Telecential Group is notified of a Tax audit, or receives
         an assessment or other correspondence (other than of an administrative
         nature) from the Tax authorities, the Purchaser shall, (and the
         Purchaser shall procure that the ComTel Companies and members of the
         Telecential Group shall) promptly inform the Seller, and the Seller and
         the Purchaser and the relevant companies and partnerships shall consult
         with each other and seek agreement on the appropriate course of action,
         taking into account the best interests of the Seller but subject always
         to obligations of confidentiality owed to third parties. The provisions
         of Article 9 hereof shall apply to the conduct of discussions,
         correspondence and negotiations preceding a dispute (if any) with the
         Tax authorities, and further as provided for in that Article.

11.3     To the extent this is reasonably required by the Purchaser (but subject
         always to obligations of confidentiality owed to third parties) the
         Seller shall procure that the members of the Seller's Group shall
         without undue delay provide to the Purchaser such information and
         access to, and copies of, the books and records of each of the members
         of the Seller's Group which has been a partner in any of the
         partnerships comprised in the Telecential Group, and provide such other
         assistance (e.g. by making available employees to provide additional
         information and explanation of any materials so provided), at the
         expense of the Purchaser, as may reasonably be requested by the
         Purchaser, as being necessary or desirable to the ComTel Companies or
         the members of the Telecential Group in fulfilling their obligations
         pursuant to Tax laws and
<PAGE>   27
                                       27

         regulations or otherwise dealing with their tax affairs in respect of
         the periods since 31 December 1997.

11.4     The Parties further covenant with each other in relation to certain Tax
         matters as more particularly set out in Schedule T.

11.5     The obligations of the Parties under Articles 11.1 to 11.3 and Schedule
         T shall, in respect of the ComTel Companies apply with effect from the
         ComTel Completion Date and, in respect of the Telecential Group shall
         apply with effect from the Telecential Completion Date.

ARTICLE 12    MISCELLANEOUS

12.1     This Agreement represents the entire understanding and agreement
         between the Purchaser and the Seller and the Transferors with respect
         to the purchase and sale of the Assets and supersedes and replaces in
         their totality all previous agreements, both in writing and oral,
         including correspondence, between the Purchaser and the Seller and the
         Transferors with respect to the purchase and sale of the Assets.

12.2     Headings are for ease of reference only and shall not affect the
         interpretation of this Agreement.

12.3     This Agreement and any Schedules and Exhibits hereto all form an
         integral part. References to Schedules, Exhibits and Articles are
         references to Schedules, Exhibits and Articles of this Agreement.

12.4     Any notice or other communication required or permitted hereunder, must
         be given in writing and either personally delivered or sent by
         registered mail or by courier or by telefax addressed as follows or to
         such other address as the Parties shall have given notice of pursuant
         hereto:

         If to the Purchaser and/or NTL :

         To                :        NTL Group Limited
                                    Bristol House
                                    1 Lakeside Road
                                    Farnborough
                                    Hampshire  GU14 6XP



         Telefax No        :        + 1252 402 170
         Attention         :        The Company Secretary

         and to            :        NTL Inc
                                    110 East 59th Street
                                    26th Floor
                                    NYC 10022
                                    USA

         Telefax No        :        + 212 906 8497
         Attention         :        Richard J Lubasch

         and to            :        Skadden Arps Slate Meagher & Flom LLP
                                    919 Third Avenue
<PAGE>   28
                                       28


                                    New York
                                    NYC 10022
                                    USA

         Telefax No        :        + 212 735 2000
         Attention         :        Thomas H Kennedy

         and to            :        Travers Smith Braithwaite
                                    10 Snow Hill, London EC1A 2AL

         Telefax no        :        171 236 3728
         Attention         :        Mr S.R. Summerfield/S.A. Jay

         If to the Seller and/or the Transferors:

         To                :        C/o. Vision Networks III B.V.
                                    Polarisavenue 41
                                    2132 JH Hoofddorp
                                    The Netherlands
         Telefax No        :        +31 23 568 5868
         Attention         :        Managing Director

         and to            :        Loeff Claeys Verbeke
                                    Weena 70
                                    3000 AB Rotterdam
                                    The Netherlands

         Telefax No        :        + 31 10 433 0282
         Attention         :        Mr. E.J. Stumphius








         Any notice or other document shall be deemed to have been given or
         served:

         1.       if personally delivered:

                  at the time of delivery, if delivered between the hours of
                  8.30 a.m. and 4.00 p.m. (local time at the place of receipt)
                  on a Business Day; or if not, at 8.30 a.m. (local time) on the
                  next following Business Day;

         2.       if posted, at 10.00 a.m. (local time) on the day four Business
                  Days after it was put in the post; or

         3.       if sent by air courier, 10.00 a.m. (local time) on the day two
                  Business Days after it was sent; or

         4.       if sent by telefax:
<PAGE>   29
                                       29



                  at the time sent, if sent between the hours of 8.30 a.m. and
                  4.00 p.m. (local time at the place of receipt) on a Business
                  Day; or

                  if not, at 8.30 a.m. (local time) on the next following
                  Business Day.

12.5     Each Party will bear its own costs and expenses in relation to the
         entry into, execution and performance of this Agreement, including all
         negotiations, preparations and investigations. The costs any and all
         stamp or registration duties which may be assessed on account of any
         act or failure to act of any Party shall be borne by such Party, it
         being understood that all registration and stamp duties (and any late
         payment of interest or penalties thereon) payable in relation to the
         transfer of the ComTel Shares from ComTel to the Purchaser pursuant to
         this Agreement shall be for the account of the Purchaser.

12.6     No Party shall make or permit any person connected with him to make any
         announcement concerning this sale and purchase or any matter in
         connection with this Agreement at any time after the date hereof except
         as required by law or any applicable Stock Exchange regulations or with
         the prior written approval of the Purchaser and the Seller.

12.7     This Agreement may not be amended, supplemented or changed, nor may any
         provision hereof be waived, except by a written instrument making
         specific reference to this Agreement signed by each of the Parties and
         by Vision Networks Holdings B.V. if it has delivered the guarantee
         referred to in Article 9.22.

12.8     If any provision of this Agreement shall be held by any court of
         competent jurisdiction to be illegal, void or unenforceable, such
         provision shall be of no force and effect, but the illegality or
         unenforceability of such provision shall have no effect upon and shall
         not impair the enforceability of any other provision of this Agreement.

12.9     The representations, warranties and other covenants and undertakings
         made by the Parties in this Agreement shall be deemed to be continuing
         and shall survive ComTel Completion and Telecential Completion.

12.10    Save as provided herein, none of the rights or obligations under this
         Agreement may be assigned or transferred by a Party without the prior
         written consent of the Purchaser and the Seller. Any Party may assign
         its rights (but not its obligations) under this Agreement to a
         subsidiary or parent undertaking for so long as such company remains a
         subsidiary or parent undertaking of such Party without the prior
         consent of any other Party, provided that such subsidiary or parent
         undertaking shall first, in writing, commit to be bound by the terms of
         this Agreement. The Purchaser and/or NTL may assign and transfer all of
         its rights and obligations under this Agreement to a parent undertaking
         of NTL (of which each of the Purchaser and NTL is and remains for the
         period of at least one year from the Telecential Completion Date a
         wholly owned subsidiary) provided the common stock of such undertaking
         is traded on NASDAQ's National Market. Where NTL and/or the Purchaser
         transfer their obligations prior to the issue of the Purchaser Security
         or prior to the conversion of such security, the Purchaser Security or
         the stock into which it converts shall be issued by the parent
         undertaking of NTL and not NTL and, where appropriate, references in
         Schedule S to NTL and NTL Common Stock shall be deemed to be references
         to the new parent undertaking and the common stock of the new parent
         undertaking respectively but shall otherwise be on the same terms and
         conditions as set out in Schedule S. Each of the Parties hereby give
         such consents as may be necessary to give effect to any such transfer
         or assignment. Any assignment and/or transfer in accordance with this
         Article 12.10 shall not in any way affect or restrict the guarantee to
         be given by Vision Networks
<PAGE>   30
                                       30

         Holdings B.V. set out in Schedule F. In the event of the Purchaser
         and/or NTL (as the case may be) assigning and transferring all of its
         rights and obligations in accordance with this Article, references in
         this Agreement to the Purchaser or NTL (as the case may be) shall be
         deemed to be references to such transferee and this includes,
         specifically, the obligations of NTL under Article 12.15.

12.11    The Parties waive their respective rights to rescind, repudiate or
         cancel this Agreement.

12.12    This Agreement shall be governed by and construed in accordance with
         the laws of England. The Parties hereby irrevocably submit to the
         non-exclusion jurisdiction of the Courts of England and Wales in
         respect of any claim, dispute or difference arising out of and in
         connection with this Agreement.

12.13    The Purchaser hereby explicitly agrees that Allen & Overy and/or Loeff
         Claeys Verbeke shall advise and act on behalf of the Seller and the
         Transferors with respect to this Agreement, any agreements resulting
         from this Agreement and any disputes resulting herefrom.

12.13A   The Seller hereby agrees to indemnify and keep indemnified the
         Purchaser and Vision Networks Services UK Limited against all
         liabilities, costs, and expenses (including Tax and any liability to
         Tax) and all actions incurred by either of them as a result of or
         arising out of or in connection with the waiver by Vision Networks UK
         Holding N.V. of any outstanding loan, together with accrued interest,
         owed to it by Vision Networks Services UK Limited. Article 9 shall not
         apply to this Article.

12.14    The Purchaser acknowledges that the existing employment relationships
         among the ComTel Companies and the Telecential Group and their
         respective employees are not affected by the transactions contemplated
         by this Agreement.

12.15    NTL GUARANTEE

12.15.1  NTL as primary obligor unconditionally and irrevocably:

         (a)      undertakes to ensure that the Purchaser will perform when due
                  all its obligations to the Seller and the Transferors (the
                  "Obligees") under or pursuant to this Agreement and the
                  Relationship Agreement;

         (b)      agrees that if and each time that the Purchaser fails to make
                  any payment to any Obligee when it is due under or pursuant to
                  this Agreement or the Relationship Agreement, NTL shall on
                  demand (without requiring the Obligee first to take steps
                  against the Purchaser or any other person) pay that amount to
                  the Obligee concerned, as the case may be.

12.15.2  Each payment to be made by NTL under this Article 12.15 shall be made
         in the currency in which the relevant amount is payable by the
         Purchaser free and clear of all deductions or withholdings of any kind,
         except for those required by law, and if any deduction or withholding
<PAGE>   31
                                       31

         must be made by law, NTL will pay that additional amount which is
         necessary to ensure that the Obligee concerned receives a net amount
         equal to the full amount which it would have received if the payment
         had been made by the Purchaser to the relevant Obligee in accordance
         with this Agreement or the Relationship Agreement (as the case may be).

12.15.3  NTL's obligations under this Article 12.15 shall not be affected by any
         matter or thing which but for this provision might operate to affect or
         prejudice those obligations, including without limitation:

         (a)      any time or indulgence granted to, or composition with the
                  Purchaser or any other person;

         (b)      the taking, variation, renewal or release of, or neglect to
                  perfect or enforce this Agreement or the Relationship
                  Agreement or any right, guarantee, remedy or security from or
                  against the Purchaser or any other person;

         (c)      any unenforceability or invalidity on whatever ground of any
                  obligation of the Purchaser, so that this Article 12.15 shall
                  be construed as if there were no such enforceability or
                  invalidity; or

         (d)      any termination of this Agreement.

12.15.4  NTL warrants that all the obligations expressed to be accepted by it
         under this Article 12.15 are legally binding obligations of it,
         enforceable in accordance with their respective terms, and that all
         necessary shareholder and other consents and authorisations for the
         giving of the guarantee and the acceptance of all other obligations by
         it under this Article 12.15 have been obtained and are in full force
         and effect.

12.15.5  NTL will reimburse the Seller for all reasonable legal and other costs
         (including any VAT) incurred by the Seller in connection with the
         enforcement of any of the provisions of this Article 12.15.

12.16    Each of the Parties shall use reasonable endeavours to prevent the
         entry of any Restraints and to appeal as promptly as possible any such
         Restraints that may be entered.

12.17    The Seller and each Transferor hereby irrevocably authorises and
         appoints Fleetside Legal Representative Services Ltd., 9 Cheap Side
         London EC2V 6AD, as its agent for service of proceedings in relation to
         any matter arising out of or in connection with this Agreement and
         service on such agent shall be deemed to be service on the Seller or
         such Transferor.

12.18    NTL hereby irrevocably authorises and appoints NTL Group Limited,
         Bristol House, 1 Lakeside Road, Farnborough, Hampshire GU14 6XP (for
         the attention of The Company Secretary) as its agent for service of
         proceedings in relation to any matter arising out of or in connection
         with this Agreement and service on such agent shall be deemed to be
         service on NTL, as applicable.

12.19    Where used in this Agreement the terms "subsidiary", "subsidiary
         undertaking", "parent undertaking", "holding company", "financial
         year", and "director" shall have the meanings respectively attributed
         to them by the Companies Act 1985 at the date of this Agreement.

12.20    A reference to any statutory provision in this Agreement:
<PAGE>   32
                                       32

         (a)      includes any order, instrument, plan, regulation, permission
                  and direction made or issued under such statutory provision or
                  deriving validity from it; and

         (b)      shall be construed as a reference to such statutory provision
                  as in force at the date of this Agreement (including, for the
                  avoidance of doubt, any amendments made to such statutory
                  provision that are in force at the date of this Agreement);
                  and

         (c)      shall also be construed as a reference to any statutory
                  provision of which such statutory provision is a re-enactment
                  or consolidation.

12.21    Words importing one gender shall (where appropriate) include any other
         gender and words importing the singular shall ( where appropriate)
         include the plural and vice versa.

12.22    Any remedy or right conferred by this Agreement on any Party for breach
         of this Agreement shall be in addition to and without prejudice to any
         other right or remedy available to it.

12.23    No failure or delay by any Party or time or indulgence given by it in
         or before exercising any remedy or right under or in relation to this
         Agreement shall operate as a waiver of the same nor shall any single or
         partial exercise of any remedy or right preclude any further exercise
         of the same or the exercise of any other remedy or right.

12.24    No waiver of any particular breach of the provisions of this Agreement
         shall operate as a waiver of any repetition of such breach.

12.25    Each of the Seller and the Transferors acknowledges that it is entering
         into this Agreement without reliance on any undertaking or
         representation given by or on behalf of the Purchaser other than
         expressly contained in this Agreement provided that nothing herein
         shall exclude the Purchaser from liability for fraudulent
         misrepresentation.

12.26    Words and phrases used in relation to activities or entities outside
         England shall where necessary be references to corresponding words and
         phrases under applicable local law.

12.27    This Agreement may be executed in two or more counterparts and
         execution by each of the Parties of any one of such counterparts will
         constitute due execution of this Agreement.

ARTICLE 13: REPAYMENT OF INDEBTEDNESS

13.1     The Seller and the Transferors hereby acknowledge that the Purchaser
         must acquire the ComTel Companies and the members of the Telecential
         Group free of any Indebtedness and that at the ComTel Completion Date
         and the Telecential Completion Date there shall be no Indebtedness of
         any of the ComTel Companies and the members of the Telecential Group
         respectively. The Seller and the Transferors hereby acknowledge and
         agree that the costs of cancelling or extinguishing such Indebtedness
         (including any prepayment and termination and associated costs) shall
         (save as otherwise expressly provided in the Agreement) be for the
         account of the Seller and the Transferor and shall not (save as
         aforesaid) under any circumstances be the responsibility of any of the
         ComTel Companies or members of the Telecential Group. Notwithstanding
         the aforesaid, the Seller and the relevant Transferor(s) shall
         indemnify and keep indemnified the Purchaser for itself and as trustee
         for each of the ComTel Companies and the members of the Telecential
         Group and the Purchaser's subsidiaries against any Indebtedness
         including any prepayment, termination or associated costs of repaying
         such Indebtedness being in existence at ComTel Completion (in relation
         to Indebtedness of the ComTel Companies as
<PAGE>   33
                                       33

         per the Balance Sheet Account) and Telecential Completion (in relation
         to Indebtedness of any member of the Telecential Group).

13.2     If there is any Indebtedness which is to be repaid or prepaid between
         the date of this Agreement and the Telecential Completion Date and as a
         result any member of the Telecential Group acquires any right against
         the creditor in respect of such Indebtedness so as to be able to direct
         such creditor to sell the asset the subject of the relevant
         Indebtedness to a person identified by such member, the Seller and the
         Transferors shall procure that the relevant member of the Telecential
         Group shall procure the sale of such assets to the Purchaser or its
         nominee if the Purchaser so elects within five Business Days of being
         asked if it wishes to do so.

ARTICLE 14: ASSIGNMENT OF CONTRACTS

14.1     The Seller and the Transferors to the extent permitted by law hereby
         assign (or shall procure that KPN shall assign) to the Purchaser the
         benefit of all contracts entered into by any of them or assigned to any
         of them in either case relating exclusively to the ComTel Companies or
         members of the Telecential Group or any of them and not already vested
         (or to the extent not already vested) in any of the ComTel Companies or
         any member of the Telecential Group, including, without limitation:

14.1.1   the benefits of any warranties, indemnities, covenants or other
         obligations of the vendor and the benefit of the guarantee relating to
         the sale and purchase agreement dated 17th October, 1995 and both
         between IVS Cable Holdings Limited, Flextech plc and KPN together with
         all contracts assigned or novated to KPN under such sale and purchase
         agreement;

14.1.2   the master operating and licensing agreement dated 24th April, 1995
         between IVS Cable Holdings Limited and Cabledata International Limited;
         and

14.1.3   any contract (date not known) created by correspondence between IVS
         Cable Holdings Limited on behalf of Wessex Cable Limited and Northern
         Telecom Europe Limited.

14.2     The Seller and the Transferors shall (and shall procure that KPN shall)
         at the cost of the Purchaser do each thing as may be reasonably
         requested by the Purchaser to vest in the Purchaser the contracts or
         rights set out in Article 14.1 (together "the Contracts").

14.3     If a Contract cannot be transferred to the Purchaser except by an
         assignment made with a third party's consent or by a novation
         agreement:

14.3.1   this Agreement does not constitute an assignment or an attempted
         assignment of that Contract if the assignment or attempted assignment
         would cause a breach of that Contract;

14.3.2   both the Purchaser and the Seller and the relevant Transferor(s) shall
         make all reasonable efforts to obtain the third party's consent to the
         assignment, or to achieve the novation, of that Contract; and

14.3.3   until the consent is obtained or the novation achieved, the Seller and
         the relevant Transferor(s) shall at the Purchaser's cost do each act
         and thing reasonably requested of it by the Purchaser to provide the
         Purchaser with the benefit of that Contract (including, without
         limitation, enforcement of a right of the Seller or relevant
         Transferors or KPN against another party to that Contract arising
         howsoever).
<PAGE>   34
                                       34

14.4     The Seller and VNUK hereby agree to procure that Vision Networks
         Services UK Limited ("VNS"), shall terminate, and VNUK hereby agrees to
         such termination, the programming agency agreement between VNS and VNUK
         dated 1st August, 1996 with effect from ComTel Completion.

ARTICLE 15: MINORITY INTEREST PROVISIONS

15.1     The Seller and the Transferors acknowledge that the Purchaser has not
         been permitted to review the agreements (the "Minority Interest
         Agreements") relating to the minority interests (other than an interest
         of another member of the Telecential Group) in Hertfordshire Cable
         Limited ("HCL"), Northampton Cable Television Limited ("NCTL") (the
         Minority's shares and other interests in NCTL and HCL being together
         referred to as the "Minority's Assets"), Telecential Communications
         (Herts) Partnership ("P3") and Telecential Communications (Northants)
         Partnership ("P4") (such minority interests being together referred to
         as the "Minority Interests") or (save for the Articles of Association
         of HCL and NCTL as filed with the Registrar of Companies) any other
         agreements or arrangements relating to such Minority Interests.
         Accordingly, each of the Seller and the Transferors (other than ComTel)
         hereby agrees to indemnify and keep indemnified the Purchaser (for
         itself and as trustee for each of the members of the Telecential Group)
         and NTL against all liabilities, costs and expenses and all actions
         incurred by any of them as a result of or arising out of or in
         connection with:-

         (a)      the Minority Interest Agreements prohibiting the sale and
                  purchase of the Telecential Assets (or any of them) in
                  accordance with this Agreement or the consummation of any of
                  the other matters contemplated by and in accordance with this
                  Agreement (including, without limitation, the matters referred
                  to in Article 5.3 and Schedule Ind.);

         (b)      any material breach by any of the Seller, any member of the
                  Seller's Group, or any member of the Telecential Group of any
                  of their respective obligations under the Minority Interest
                  Agreements on or prior to Telecential Completion (save as a
                  result of or arising out of any action taken by the Purchaser
                  and/or its nominees and/or NTL);

         (c)      save as disclosed in the Annual Accounts or the Articles of
                  Association of any members of the Telecential Group, there
                  being at or as a result of the Telecential Completion any
                  material restriction in favour of the Minority Interests in
                  respect of any normal operating matters affecting the
                  respective businesses of the Telecential Group (as such
                  businesses are described in such Annual Accounts) or in
                  respect of any budgetary, funding of capitalisation (whether
                  by way of capital or loan)or dividend issues of such entities;

         (d)      any of the members of the Telecential Group (including without
                  limitation, HCL, NCTL, P3 and P4) being at or as a result of
                  the Telecential Completion under any obligation under the
                  Minority Interest Agreements to make any cash payments to the
                  Minority Interests and/or P3 and/or P4 (and/or the partners
                  thereof), other than pursuant to a transfer of such Minority's
                  Assets to any other member of the Telecential Group; and

         (e)      any of the Minority Interests having at or as a result of
                  Telecential Completion any right under the Minority Interest
                  Agreements to acquire any assets from any member of the
                  Telecential Group;
<PAGE>   35
                                       35

         (f)      the Minority Interests having in any of the Telecential
                  Partnerships any rights to receive profits in excess of those
                  disclosed in the Annual Accounts of HCL and NCTL or any
                  liability to a proportional share of the losses which is less
                  than such Minority Interests' share of the profits from time
                  to time; and

         (g)      the Minority Interest Agreements materially restricting or
                  preventing the lawful payment of any profits or non-capital
                  distributions by any member of the Telecential Group;

         (h)      any right in favour of or any obligation to any person under
                  or pursuant to the Minority Interests Agreements or any right
                  in favour of or any obligation to any person under any
                  arrangement or agreement relating to P3, P4, HCL or NCTL for
                  the benefit of or the subject of which is a member of the
                  Telecential Group arising or being terminated or restricted by
                  reason of the consummation of the matters contemplated by this
                  Agreement (including, without limitation, Telecential
                  Completion other than as may arise as a matter of law);

         (i)      members of the Telecential Group being required to acquire the
                  shares in HCL and/or NCTL other than as described in the
                  Offering Memorandum.

15.2     Each of the Seller and the Transferors hereby agrees that it will, and
         the Seller hereby agrees that it will procure that each member of the
         Seller's group will, upon it acquiring any of the Minority's Interests,
         forthwith transfer, or procure the transfer of, such title to such
         assets to the Purchaser (or such other nominee of the Purchaser as the
         Purchaser may nominate), as it may obtain from the Minority Interest
         free from all liens, charges, encumbrances or other interests of any
         other person relating to or over its assets (subject to the Purchaser
         complying with its obligations under Article 15.3).

15.3     If the Seller, any Transferor or any other member of the Seller's Group
         (the "relevant transferor") transfers the Minority's Assets to the
         Purchaser (or its nominee) pursuant to and in accordance with Article
         15.1, the Purchaser agrees to procure that, against delivery of duly
         executed transfers of the Minority's Assets and the relative share
         certificates, the relevant transferor shall at the option of the
         Purchaser, (i) be paid the cash sum of pound sterling 7,500,000, or
         (ii) be issued, credIted as fully paid, with either common stock of NTL
         having a market value (as determined by Article 15.5) equal to the US$
         equivalent of pound sterling 7,500,000 or (iii) (but only where
         completion is to take place at Telecential Completion or where the
         Seller has been issued with and is still holding the Purchaser Security
         pursuant to Article 5.3.5 and such security has not been redeemed or
         converted in accordance with its terms) be issued with such number of
         additional Purchaser Security having a principal amount equal to the
         US$ equivalent value (as determined by Article 15.5) of pound sterling
         7,500,000. Completion of the sale and purchase of any Minority's Assets
         pursuant to this Article 15.3 shall take place on the Telecential
         Completion Date or, if later, within 5 Business Days following
         completion of the purchase of such Minority's Assets by the Seller,
         relevant Transferor or other member of the Seller's Group. The relevant
         transferor shall procure that prior to such completion it shall have,
         if applicable, been registered as the registered member of the shares
         to be transferred.

15.3     The Seller and the Transferors shall procure that no other member of
         the Seller's Group shall acquire the Minority's Assets prior to
         Telecential Completion. If any of the Seller or the Transferors shall
         acquire the Minority's Assets prior to the Telecential Completion Date,
         it shall, simultaneously with Telecential Completion transfer such
         assets to the Purchaser in accordance with Article 15.2 against
         satisfaction by or on behalf of the Purchaser of the purchase price
         payable in accordance with Article 15.3. Under no circumstances shall
         any of
<PAGE>   36
                                       36

         the ComTel Companies or members of the Telecential Group make any
         payments or agree to make any payments in respect of the Minority's
         Assets prior to Telecential Completion.

15.4     For the purposes of determining the number (if any) of shares of common
         stock of NTL to be issued pursuant to Article 15.2, the market value of
         each share of NTL common stock shall be deemed to be the
         volume-weighted average of the average high and low sales prices of NTL
         common stock on NASDAQ for each of the ten trading days ending on the
         trading day prior to the completion of the purchase by the Purchaser
         (or its nominee) of the Minority's Assets.

15.5     The calculation of the dollar equivalent shall be by reference to the
         average of the two highest and two lowest figures of the average spot
         rates of exchange of Chase Manhattan Bank N.A. for the purchase of
         pound sterling sterling with US$ at or about 11.00 a.m. on the ten
         Business Days immediately preceding the completion of the purchase by
         the Purchaser (or its nominees) of the Minority's Assets.

15.6     The Seller and the Transferors hereby warrant and represent to the
         Purchaser that there are no arrangements or agreements between the
         Minority Interests and any of the ComTel Companies as at ComTel
         Completion Date.


AS WITNESS this Agreement has been executed by the Parties hereto on the date
first above written.
<PAGE>   37
                                       37


- ----------------------------------------------------------
For    : Vision Networks III B.V., for the purposes hereof duly represented
By     : Willem Ackermans
Its    : Concern Treasurer



- ------------------------------------------------------
For    : NTL Group Limited, for the purposes hereof duly represented
By     : Robert Mackenzie
Its    : Director and Company Secretary



- ----------------------------------------------
For    : NTL INC, for the purposes hereof duly represented
By     : John Gregg
Its    : Vice President



- ------------------------------------------------------------------
For    : Vision Networks UK Holding B.V., for the purposes hereof duly
         represented
By     : Willem Ackermans
Its    : Concern Treasurer



- ----------------------------------------------------------------
For    : Vision Networks (UK) I Limited, for the purposes hereof duly
         represented
By     : Willem Ackermans
Its    : Concern Treasurer



- ----------------------------------------------------------------
For    : Vision Networks (UK) II Limited, for the purposes hereof duly
         represented
By     : Willem Ackermans
Its    : Concern Treasurer
<PAGE>   38
                                       38

- ------------------------------------------------------------------------
For    : Telecential Communications (Canada) Ltd, for the purposes hereof duly
         represented
By     : Willem Ackermans
Its    : Concern Treasurer



- -----------------------------------------------------------
For    : ComTel UK Finance B.V., for the purposes hereof duly represented
By     : Willem Ackermans
Its    : Concern Treasurer



- ------------------------------------------------------------------------
For    : Telecential Communications (UK) Limited, for the purposes hereof duly
         represented
By     : Willem Ackermans
Its    : Concern Treasurer


<PAGE>   39
                                   SCHEDULE C

                       COVENANTS TO TELECENTIAL COMPLETION

      The Seller and the Transferors procure, from the date hereof until
      Telecential Completion, that none of the members of the Telecential Group
      shall, subject to this Schedule C, do any of the matters set out below,
      without the prior consent of the Purchaser (such consent not to be
      unreasonably withheld or delayed):

1.    incur any individual expenditure exceeding GPB 1,000,000 (in words: one
      million Pounds Sterling) with the exception only of (i) payments
      (consistent with past practice) of wages, social security charges, offices
      leases or insurance claims, insurance premium taxes and other operating
      costs associated with managing the business as a going concern, (ii)
      capital expenditures, provided these are within existing budgets for the
      current financial year or committed at the date of this Agreement; or

2.    dispose of or grant an option to purchase or right of pre-emption in
      respect of any material part of their respective assets (including,
      without limitation, in respect of the shares in any of their subsidiaries)
      except in the ordinary course of trading; or

3.    borrow any money other than from the Seller or any Transferor or another
      member of the Telecential Group or make any payments other than payments
      mentioned in this Agreement out of or through drawings on their respective
      bank accounts (except routine payments, consistent with past practice in
      the ordinary course of trading) or grant or permit to exist any lease,
      lien, claim or encumbrance or other third party right in respect of any of
      their properties or any of their other assets; or

4.    make or commit to make any loan other than in the ordinary course of
      trading not exceeding GBP 0 ( in words: zero Pounds Sterling) in the
      aggregate or to another member of the Telecential Group;

5.    modify, amend, alter, revoke, rescind, terminate or act, or omit to act,
      in any way which affects, or could affect, in any material manner the
      provisions, validity or enforceability of any of its material contracts,
      commitments, licences or agreements;

6.    vary any class rights attached to any shares, create or issue any shares,
      grant any option over any shares or uncalled capital or issue any
      securities convertible into shares;

7.    capitalise any amount standing to the credit of any reserve or redeem or
      purchase any share or otherwise reorganise share capital (except in
      accordance with this Agreement and Schedule Ind);

8.    admit any person (other than a party of this Agreement), whether by
      subscription, transfer or transmission, as a member or shareholder or as a
      partner (except in accordance with Schedule Ind);

9.    create or grant any mortgage, charge, debenture, lease or other
      encumbrance over or affecting any of its assets or undertaking;

10.   acquire the shares of any other company or the whole or any part of the
      undertaking of any other company or person;
<PAGE>   40
11.   enter into any joint venture, partnership or European Economic Interest
      Grouping;

12.   enter into, vary, amend, supplement or in any way modify any agreement
      with any member of the Seller's Group (except in accordance with Schedule
      Ind);

13.   enter into any contract or commitment or any transaction otherwise than at
      arm's length and for full value or any unusual or abnormal contract or
      commitment;

14.   give any guarantee or indemnity other than in the ordinary course of
      trading;

15.   enter into, vary, amend, supplement or in any way modify any agreement
      with any member of the Seller's Group (except in accordance with Schedule
      Ind) or pay or agree to pay any management or similar charges or make any
      other payment to any member of the Seller's Group;

16.   enter into any material agreement, arrangement or understanding with
      respect to programming, software, the provisioning of cable modem internet
      services, billing, the provisional of digital CATV services and/or the
      acquisition of set top boxes, switching equipment or other computer and/or
      telecommunications equipment;

17.   make any payment in respect of Indebtedness other than in the manner
      contemplated by Schedule Ind;

18.   enter into, vary, amend, supplement or modify in any material respect any
      of the partnerships deeds or arrangements or any of the agreements or
      arrangements relating to the interests of any person (other than another
      member of the Telecential Group in any member of the Telecential Group);

19.   declare, make or pay any dividend or other distribution;

20.   authorise or commit or agree to take any of the foregoing action.

Neither the Seller nor the Transferors shall be liable under this Schedule C for
any action taken by or with the approval of the Purchaser pursuant to its rights
under the Relationship Agreement.

The Seller and the Transferors shall procure that from the date hereof until
Telecential Completion, each member of the Telecential Group shall comply with
the provisions of the Relationship Agreement applicable to ComTel as if it were
a party thereto jointly with ComTel and in particular shall, subject to the
Purchaser not preventing any such payment, pay to the relevant ComTel Company
all amounts received by the relevant member of the Telecential Group from any
person (including, without limitation, customers) which relate to the business
of or are otherwise due to a ComTel Company.
<PAGE>   41
                                   SCHEDULE D

                                  DEFINED TERMS

"AGREEMENT"                         means this sale and purchase agreement
                                    entered into between the Seller, the
                                    Transferors, and the Purchaser and NTL for
                                    the acquisition of the Assets.

"ANNUAL ACCOUNTS"                   means
                                 
                                    (a)      (to the extent applicable) the
                                             audited consolidated balance sheets
                                             of each of the ComTel Companies and
                                             members of the Telecential Group as
                                             at the Balance Sheet Date and the
                                             audited consolidated profit and
                                             loss accounts of each of the ComTel
                                             Companies and members of the
                                             Telecential Group for the financial
                                             year ended on the Balance Sheet
                                             Date,

                                    (b)      the audited balance sheets of each
                                             of the ComTel Companies and members
                                             of the Telecential Group as at the
                                             Balance Sheet Date and the audited
                                             profit and loss accounts of each of
                                             the ComTel Companies and members of
                                             the Telecential Group for the
                                             financial year ended on the Balance
                                             Sheet Date,

                                    together in each case with the related
                                    notes, directors' report and auditor's
                                    report.


"ARTICLE"                           means any article in this Agreement.

"ASSETS"                            means the ComTel Companies and the
                                    Telecential Group taken together.

"BALANCE SHEET DATE"                means 31 December 1997.

"BOND ISSUE"                        means the Bond Issue referred to in recital
                                    E to this Agreement

"BREACH"                            means a breach of the Warranties as
                                    contemplated by Article 9 of this Agreement.

"BUSINESS DAY"                      means any day on which banks are open for
                                    business in both Amsterdam, the Netherlands
                                    and the City of London.

"CAPITAL CONTRIBUTIONS"             means amounts (inpound sterlingsterling)
                                    subscribed for shares in the limited
                                    companies of the ComTel Companies and the
                                    Telecential Group and amounts (inpound
                                    sterlingsterling) contributed to the capital
                                    account of the partnerships within the
                                    Telecential Group (excluding Capital
                                    Contributions from a member of the
                                    Telecential Group to a ComTel Company and
                                    vice versa).
<PAGE>   42
"CONFIRMATION"                      means a certificate substantially in the
                                    form of Schedule Y to be provided by the
                                    Purchaser to the Seller confirming (i) the
                                    truth and correctness of the Purchaser's
                                    Warranties at each of the ComTel Completion
                                    Date and the Telecential Completion Date and
                                    (ii) that, save as disclosed therein, the
                                    Purchaser is not aware any Breach or
                                    Non-Fulfilment, all this at the ComTel
                                    Completion Date and the Telecential
                                    Completion Date.

"COMTEL COMPANIES"                  means each of the companies referred to in
                                    the definition of ComTel Shares.

"COMTEL COMPLETION"                 means the performance of the obligations to
                                    complete the transfer of the ComTel Shares
                                    as described in Article 4.

"COMTEL COMPLETION DATE"            means the date of ComTel Completion as
                                    referred to in Article 4.1 of this
                                    Agreement.

"COMTEL LIMITED SHARES"             means the entire issued and outstanding
                                    share capital of ComTel Limited.

"COMTEL SHARES"                     means the entire issued and outstanding
                                    share capitals of Andover Cablevision
                                    Limited, Oxford Cable Limited, Stafford
                                    Communications Limited, Wessex Cable
                                    Limited, ComTel Coventry Limited, ComTel
                                    Cable Services Limited, Lichfield Cable
                                    Communications Limited, Tamworth Cable
                                    Communications Limited and Vision Networks
                                    Services UK Limited.

"DATA ROOM INFORMATION"             means (i) the Data Room Rules, (ii) the
                                    indexes prepared by the Seller listing all
                                    documents and written information made
                                    available to the Purchaser in the data rooms
                                    at Amsterdam (Loeff Claeys Verbeke) and
                                    London (Allen & Overy) and all such
                                    documents and written information as so
                                    listed in Schedule I, (iii) the Offering
                                    Memorandum for the Bond Issue, and (iv) the
                                    Information Memorandum.

"DAY"                               means a calendar day and is not capitalized
                                    in this Agreement.

"EXHIBIT"                           means any exhibit attached to this
                                    Agreement.

"FIRST DATE"                        means the date referred to in Article 6.4.

"HEARTLAND SHARES"                  means the entire issued share capital of
                                    each of Heartland Cablevision (UK) Limited
                                    and Heartland Cablevision 11 (UK) Limited.

"INDEBTEDNESS"                      means any indebtedness which would appear on
                                    a balance sheet of any of the ComTel
                                    Companies or a member of the Telecential
                                    Group prepared under generally accepted
                                    principles in the applicable jurisdiction,
                                    but excluding (i) any working capital
                                    liabilities, and (ii) the BT Coventry Lease.
<PAGE>   43
"INFORMATION MEMORANDUM"            means that certain memorandum prepared by
                                    Credit Suisse First Boston (Europe) Limited
                                    dated April, 1997.

"LONG STOP DATE"                    has the meaning ascribed thereto in Article
                                    4.9.

"NET ASSET STATEMENT"               means a statement showing the consolidated
                                    Net Asset Value of the ComTel Companies and
                                    the Telecential Group as at 31 December
                                    1997, prepared by Deloitte & Touche on
                                    behalf of the Seller and the Transferors
                                    using the accounting bases, policies and
                                    accounting estimation processes consistently
                                    applied as set out in Schedule AA.

"NET ASSET VALUE"                   means the amount by which the aggregate
                                    value of all the assets of the ComTel
                                    Companies and the members of the Telecential
                                    Group exceeds the aggregate amount of all
                                    their liabilities.

"NON-FULFILMENT"                    has the meaning given to that term in
                                    Article 9.1 (subject to Article 9.2).

"PARTIES"                           means the Sellers, the Transferors, the
                                    Purchaser and NTL and "PARTY" means any one
                                    of them.

"PURCHASER'S ACCOUNTANT"            means the accountancy firm of international
                                    standing appointed by the Purchaser for the
                                    purpose of this Agreement

"PURCHASE PRICE"                    has the meaning given to that term in
                                    Article 2.7.

"PURCHASER SECURITY"                means the security to be issued by NTL in
                                    partial satisfaction of the Purchase Price
                                    at Telecential Completion in accordance with
                                    article 5.3.5(b) having the terms and
                                    conditions set out in Schedule S.

"RELATIONSHIP AGREEMENT"            means the relationship agreement in the form
                                    set out in Schedule M.

"RELEVANT ASSET"                    means any property or asset (other than the
                                    Assets) (whether tangible or intangible,
                                    comprising the benefit of any contract or
                                    otherwise) exclusively relating to or used
                                    by any ComTel Company or member of the
                                    Telecential Group which is owned by any
                                    member of the Seller's Group.

"SCHEDULE"                          means any schedule attached to this
                                    Agreement.

"SELLER'S ACCOUNTANT"               means the accountancy firm of international
                                    standing appointed by the Seller for the
                                    purpose of this Agreement.

"SELLER'S GROUP"                    means the Seller, any parent undertaking of
                                    the Seller and the subsidiary undertakings
                                    of the Seller and such parent undertaking
                                    for the time being (other than the ComTel
                                    Companies and the members of the Telecential
                                    Group), but excluding Koninklijke PTT
                                    Nederland NV (KPN) and its legal successors
                                    following the demerger of KPN.
<PAGE>   44
"STOCK EXCHANGE"                    means any regulated securities market.

"TAX"                               means, but is not limited to all taxes,
                                    duties, charges, levies, imposts or
                                    withholdings whenever and by whatever
                                    authority imposed and whether or not any
                                    such taxes, duties, charges, levies, imposts
                                    or withholdings are directly or primarily
                                    chargeable against or to any of the ComTel
                                    Companies or the members of the Telecential
                                    Group together with in any such case all
                                    interest, fines, penalties, surcharges and
                                    charges incidental or relating to the impos
                                    imposts or withholdings.

"TAX INDEMNITY"                     means the provisions contained in Schedule
                                    T.

"TELECENTIAL ASSETS"                means the ComTel Limited Shares, the
                                    Heartland Shares and all interests in the
                                    Telecential Communications Partnership and
                                    LP5 and LP6.

"TELECENTIAL COMPLETION"            means the performance of the obligations to
                                    complete the transfer of the Telecential
                                    Assets as described in Article 5 of this
                                    Agreement.

"TELECENTIAL COMPLETION DATE"       means the date determined in accordance with
                                    Articles 4.6 to 4.8 (inclusive).

"TELECENTIAL PARTNERSHIPS"          means the Telecential Communications
                                    Partnership, Telecential Communications
                                    Northants Partnership, Telecential
                                    Communications Herts Partnership, LP5 and
                                    LP6.

"TELECENTIAL GROUP"                 means the Telecential Assets, the
                                    subsidiaries of ComTel Limited and the
                                    companies and partnerships in which the
                                    Telecential Communications Partnership and
                                    LP5 and LP6 have an interest and references
                                    to a "member of the Telecential Group" shall
                                    be construed as a reference to each of such
                                    entities.


"WARRANTIES"                        means the representations and warranties
                                    given by the Seller and the Transferors to
                                    the Purchaser, and by the Purchaser to the
                                    Seller and the Transferors, pursuant to this
                                    Agreement.
<PAGE>   45
                                   SCHEDULE F

                                    GUARANTEE


THIS GUARANTEE IS MADE ON [ ] 1998 IN FAVOUR OF

NTL GROUP LIMITED, a private limited liability company incorporated in England
and having its registered office at Bristol House, 1 Lakeside Road, Farnborough,
Hampshire, England.

We refer to an agreement for the sale and purchase of the Vision Networks UK
Group dated June 1998 between Vision Networks III B.V., ComTel UK Finance B.V.,
Vision Networks (UK) limited, Telecential Communications (Canada) Limited,
Vision Networks (UK) II Limited, Telecential Communications (UK) Limited, Vision
Networks UK Holdings B.V., NTL Group Limited and NTL Inc (the "Agreement").
Capitalised terms used in this Guarantee shall have the meanings ascribed to
them in the Agreement, except as the context may otherwise require.

We, as primary obligor unconditionally and irrevocably:

         (a)      undertakes to ensure that the Seller will perform when due all
                  its obligations to the Purchaser under or pursuant to the
                  Agreement;

         (b)      agrees that if and each time that the Seller fails to make any
                  payment to the Purchaser when it is due under or pursuant to
                  the Agreement we shall on demand (without requiring the
                  Purchaser first to take steps against the Seller or any other
                  person) pay that amount to the Purchaser concerned, as the
                  case may be.

         Each payment to be made by us under this Guarantee shall be made in the
         currency in which the relevant amount is payable by the Seller free and
         clear of all deductions or withholdings of any kind, except for those
         required by law, and if any deduction or withholding must be made by
         law, we will pay that additional amount which is necessary to ensure
         that the Purchaser concerned receives a net amount equal to the full
         amount which it would have received if the payment had been made by the
         Seller to the Purchaser in accordance with the Agreement.

         Our obligations under this Guarantee shall not be affected by any
         matter or thing which but for this provision might operate to affect or
         prejudice those obligations, including without limitation

         (a)      any time or indulgence granted to, or composition with the
                  Seller or any other person;

         (b)      the taking, variation, renewal or release of, or neglect to
                  perfect or enforce the Agreement or any right, guarantee,
                  remedy or security from or against the Seller or any other
                  person;

         (c)      any unenforceability or invalidity on whatever ground of any
                  obligation of the Seller, so that this Guarantee shall be
                  construed as if there were no such enforceability or
                  invalidity; or

         (d)      any termination of the Agreement.

         We warrant that all the obligations expressed to be accepted by us
         under this Guarantee are legally binding obligations of us, enforceable
         in accordance with their respective terms, and that 
<PAGE>   46
         all necessary shareholder and other consents and authorisations for the
         giving of this guarantee and the acceptance of all other obligations by
         us under it have been obtained and are in full force and effect.

         We will reimburse the Purchaser for all reasonable legal and other
         costs (including any VAT) incurred by the Purchaser in connection with
         the enforcement of any of the provisions of this Guarantee.

         Vision Networks Holdings B.V. hereby confirms its consent to all
         obligations expressly undertaken by it under this Guarantee.

         This Guarantee shall be governed by and construed in accordance with
         the laws of England and we hereby irrevocably submit to the
         non-exclusive jurisdiction of the courts of England and Wales in
         respect of any claim, dispute, or difference arising out of and in
         connection with the Guarantee. We hereby irrevocably authorise and
         appoint (for the attention of ) as our agent for service of proceedings
         in relation to any matter arising out of or in connection with this
         Guarantee and service on such agent shall be deemed to be service on
         us.

         For :Vision Networks Holdings B.V., for the purposes hereof duly
         represented.

         By :

         Its :


<TABLE>
<S>                                          <C>
         -------------------------------     ----------------------------------------
         for and on behalf of                Vision Networks UK Holding B.V.
         ComTel UK Finance B.V.              (in liquidation)


        --------------------------------     ----------------------------------------
        for and on behalf of                 Telecential Communications (UK) Limited
        Vision Networks (UK) I Limited


        --------------------------------     ----------------------------------------
        for and on behalf of                 for and on behalf of NTL Inc.
        NTL Group Limited
</TABLE>

<PAGE>   47
                                   SCHEDULE I

                              DATA ROOM INFORMATION

<PAGE>   48
                                   SCHEDULE J

                        STIKEMAN, ELLIOTT OPINION LETTER

<PAGE>   49
                                   SCHEDULE K

              SKADDEN ARPS SLATE MEAGHER & FLOM LLP OPINION LETTER

<PAGE>   50
                                   SCHEDULE O

<PAGE>   51
                                   SCHEDULE P


<PAGE>   52
                                   SCHEDULE Q

<PAGE>   53
                                   SCHEDULE R

                         REPRESENTATIONS AND WARRANTIES



1.       PART OF THE AGREEMENT

         This Schedule forms part of the Agreement for the purchase and sale of
         the Assets between the Purchaser and the Seller and shall have the same
         force and effect as if set out in the body of the Agreement.

2.       INTERPRETATION

         In this Schedule, words or phrases will have the same meanings as in
         the Agreement.

         References to a member of the Telecential Group which is a partnership
         owning or holding any asset or having any liability or not having done
         or omitted to do anything or any similar expressions shall be deemed,
         except in relation to corporation tax, to include a reference to the
         partners of the relevant partnership in their capacity as partners as
         well as to the partnership itself.

3.       WARRANTIES

         In accordance with, and subject to the provisions of, Article 7, each
         of the Seller and Transferors represents and warrants to the Purchaser
         that as at the date of this Agreement (and at Telecential Completion by
         reference to the facts and circumstances then subsisting), each and
         every statement set out below is true and correct.

A.       COMTEL GROUP

1.       The ComTel Companies and the companies within the Telecential Group are
         duly incorporated and validly existing under the laws of England and
         Wales.

2.       Each of the Telecential Partnerships has been duly constituted and is
         validly existing under the laws of England and Wales. Each of the
         ComTel Companies and companies and limited partnerships within the
         Telecential Group has properly made all returns which it is required to
         make to the Registrar of Companies, to any governmental or regulatory
         body and to any local authority. No receiver or administrative receiver
         has been appointed of the whole or any part of the assets or
         undertaking of any of the ComTel Companies or companies in the
         Telecential Group. No administration order has been made in relation to
         any of the ComTel Companies or companies in the Telecential Group and
         no petition for such an order has been presented. No proposal for a
         voluntary arrangement between any of the ComTel Companies or companies
         in the Telecential Group and its creditors (or any class of them) has
         been made to any of the ComTel Companies or companies in the
         Telecential Group. No petition has been presented, no order has been
         made and no resolution has been passed for the winding-up of any of the
         ComTel Companies or companies in the Telecential Group. None of the
         ComTel Companies or members of the Telecential Group has stopped
         payment generally to its creditors or, to the best knowledge of the
         Seller, is unable to pay its debts as and when they fall due. No
         unsatisfied judgement is outstanding against any of the ComTel
         Companies or members of the Telecential Group.
<PAGE>   54
B.       THE SHARES

1.       The ComTel Shares, the ComTel Limited Shares and the Heartland Shares
         together constitute the entire issued and outstanding share capital of
         the ComTel Companies, ComTel Limited, Heartland Cablevision (UK)
         Limited and Heartland Cablevision (UK) II Limited. Canco 1 and UK 1 are
         the only partners of the Telecential Communications Partnership. UKII
         and Canco 3 are the only partners of LP5 and VNUK and Canco 3 are the
         only partners of LP6.

2.       The ComTel Shares, the ComTel Limited Shares and the Heartland Shares
         are duly authorised, validly issued and are fully paid up. The ComTel
         Shares, the ComTel Limited Shares and the Heartland Shares are free and
         clear of any equities, claims or interests in favour of any other
         person.

3.       There are no outstanding depositary receipts in the capital of any of
         the ComTel Companies or the companies in the Telecential Group. There
         are no rights (whether exercisable now or in the future and whether
         contingent or not) other than rights as disclosed in the Data Room
         Information outstanding to subscribe for or call for the issue or
         transfer of any shares of any of the ComTel Companies or companies in
         the Telecential Group. In particular there are no share options,
         warrants or convertible debentures relating to the ComTel Companies or
         the companies in the Telecential Group.

4.       No resolution has been made and no action has been taken by the ComTel
         Companies or the companies in the Telecential Group to distribute
         dividends, to repay capital or to make any other distribution of
         reserves or capital, except as shown in the Annual Accounts of the
         ComTel Companies or companies in the Telecential Group. Except as shown
         in the Annual Accounts and the Articles of Association or the ComTel
         Companies and companies within the Telecential Group, no ComTel Company
         or company in the Telecential Group has issued any profit sharing bonds
         or otherwise attributed rights to third parties to share in past,
         present or future income or profits, reserves or liquidation surplus of
         such company which remain outstanding.

C.       SHARES IN THE COMPANIES WITHIN THE TELECENTIAL GROUP (EXCLUDING THE
         TELECENTIAL ASSETS) ("THE SUBSIDIARIES")

1.       ComTel Limited is the direct or indirect legal and beneficial owner of
         the shares in the subsidiaries of it as set out in Part 1 of Schedule Z
         which together comprise all the interests of ComTel Limited and
         Telecential Communications Partnership is the direct or indirect
         beneficial owner of the shares in the companies set out in Part II of
         Schedule Z which, together with P3 and P4, comprise all the interests
         of the Telecential Communications Partnership.

2.       All of the shares in the Subsidiaries are duly authorised, validly
         issued and are fully paid up. There are no capital contributions
         overdue for payment to any of the partnerships in the Telecential
         Group. All of the shares in the Subsidiaries and the participations in
         the partnerships in Telecential listed in Schedule Z are free and clear
         of any liens or charges of any kind or any encumbrances or interests in
         favour of any other person.

3.       Telecential Communications Partnership, Maza Limited and Herts Cable
         Limited are the only partners in Telecential Communications (Herts)
         Partnership. Telecential Communications Partnership, Maza Limited and
         Northampton Cable Television Limited are the only partners in
         Telecential Communications (Northants) Partnership.
<PAGE>   55
4.       There are no rights (whether exercisable now or in the future and
         whether contingent or not) outstanding to subscribe for or call for the
         issue or transfer of any shares of any of the Subsidiaries other than
         rights as disclosed in the Data Room Information for existing members
         of the ComTel Companies or companies in the Telecential Group to
         subscribe further shares of the classes of share they hold. Since the
         Balance Sheet Date, no resolution has been made and no action has been
         taken to distribute dividends, to repay capital or to make any other
         distribution of reserves or capital of any of the Subsidiaries other
         than as shown in the Annual Accounts of such company.

D.       ANNUAL ACCOUNTS

1.       The Annual Accounts (as defined) have been prepared in accordance with
         United Kingdom generally accepted accounting principles, comply in all
         material respects with the requirements of the laws of England and
         Wales and show a true and fair view of the state of affairs and the
         financial position and results of the relevant company or partnership
         as at and for the financial year ended on 31 December, 1997.

2.       To the best knowledge of the Seller the management accounts for the
         ComTel Companies and members of the Telecential Group for the period to
         30th April, attached hereto as Exhibit 1 show the true understanding of
         the management of the ComTel Companies and the Telecential Group of the
         combined affairs, assets, liabilities and profits of such companies and
         partnerships as at and for the period ended on the date to which they
         have been prepared.

E.       TAXES

1.       To the best of the knowledge of the Seller, each of the ComTel
         Companies and members of the Telecential Group have duly and timely
         paid all Taxes due, or, to the extent that any Taxes are due but not
         yet paid, adequate provision has been made in the Annual Accounts.

2.       To the best of the knowledge of the Seller, the ComTel Companies and
         members of the Telecential Group have each duly and timely filed all
         tax returns and all other documents that are required to have been
         filed by them in accordance with applicable laws and regulations. To
         the best knowledge of Seller, the ComTel Companies and members of the
         Telecential Group have not asked for any extensions of time for the
         filing of any tax returns or other documents.

3.       To the best of the knowledge of the Seller, with respect to the
         assessment or payment of Taxes, no special agreements, rulings or
         compromises have been entered into by any of the ComTel Companies and
         members of the Telecential Group with the relevant Tax authorities. To
         the best of the knowledge of the Seller, the ComTel Companies and
         members of the Telecential Group are not subject to a special regime in
         respect of the payment of Taxes.

4.       To the best knowledge of the Seller, none of the ComTel Companies or
         the members of the Telecential Group is liable for Taxes or social
         security charges imposed on or due by any third party (including
         without limitation any employee, sub-contractor, the Seller, the
         Transferors and/or any other member of the Sellers' Group), except to
         the extent that adequate provisions have been made in the Annual
         Accounts.

5.       To the best of the knowledge of the Seller, none of the ComTel
         Companies or the members of the Telecential Group are parties to any
         Tax dispute or fiscal proceedings initiated by the Inland Revenue, H M
         Customs and Excise or Contributions Agency ("Tax Authorities") nor have
         the ComTel Companies or members of the Telecential Group received
         notice of any intention by any of the Tax Authorities to initiate any
         such disputes or proceedings as of the date hereof.
<PAGE>   56
F.       CONDUCT OF BUSINESS SINCE THE BALANCE SHEET DATE

1.       To the best of the knowledge of the Seller, during the period between
         the Balance Sheet Date and the date of this Agreement, no material
         assets of the ComTel Companies or members of the Telecential Group have
         been disposed of other than in the ordinary course of trading and none
         of the ComTel Companies or members of the Telecential Group have become
         subject to any material commitment other than in the ordinary course of
         trading except for anything done by any of the ComTel Companies or
         members of the Telecential Group in accordance with Schedule Ind. prior
         to the date of this Agreement. To the best knowledge of Seller, during
         the period between the Balance Sheet Date and the date of this
         Agreement, there has been no material adverse change in the business
         position or the financial position of any of the ComTel Companies and
         members of the Telecential Group.

2.       Since the Balance Sheet Date, none of the ComTel Companies or members
         of the Telecential Group have made any investments or disposals
         material to the balance sheet in its Annual Accounts other than in the
         ordinary course of trading except for anything done by any of the
         ComTel Companies or members of the Telecential Group in accordance with
         Schedule Ind. prior to the date of this Agreement.

3.       Since the Balance Sheet Date, each of the ComTel Companies and members
         of the Telecential Group has carried on its business in the ordinary
         and usual course without any material interruption or material
         alteration in the nature, scope or manner of its business except for
         anything done by any of the ComTel Companies or members of the
         Telecential Group in accordance with Schedule Ind prior to the date of
         this Agreement.

G.       PENSIONS

1.       To the best of the knowledge of the Seller, all material contributions
         of the ComTel Companies and members of the Telecential Group due to the
         Schemes defined in paragraph G3 below have been fully paid or provided
         for in the Annual Accounts.

2.       To the best of the knowledge of the Seller, the Annual Accounts contain
         a sufficient provision for all material obligations, including
         back-service obligations, of the ComTel Companies and the members of
         the Telecential Group under the Schemes defined in paragraph G3.

3.       "Schemes" means all and each of the Telecential Communications Limited
         Group Personal Pension Scheme, the CUC Group Life Assurance Scheme, the
         ComTel Group Personal Pension Scheme and the ComTel Group Life
         Assurance Scheme.

         "Scheme Documents" means the documents relating to the Schemes set out
         in Schedule I. The Scheme Documents comprise all the material documents
         governing and relating to the Schemes including a list of the active
         members of the Schemes with details of age, sex, salaries and
         contributions payable by both the employer and the employee.

         Save pursuant to the Schemes, none of the ComTel Companies nor the
         members of the Telecential Group have entered into any agreement or
         arrangement (under contract or trust) to (i) provide relevant benefits
         (as defined in section 612 of the Income and Corporation Taxes Act 1988
         but with the omission of the exception in that definition) for any past
         and present employee, officer and/or director of any of the ComTel
         Companies or members of the Telecential Group or their respective
         spouses and dependants, or any person who at the date of 
<PAGE>   57
         this Agreement is a beneficiary (present or contingent) of the Schemes;
         (ii) or to make contributions to a personal pension scheme in respect
         of any such person.

4.       The Scheme Documents correctly describe all the benefits which may
         become payable under the Schemes. The Schemes have at all times been
         operated, and employees have been eligible to join the Schemes, in
         accordance in all material respects with the provisions governing them,
         their contracts of employment and all applicable laws, fiscal and
         regulatory requirements. The rates of contributions payable by the
         ComTel Companies and the members of the Telecential Group have been
         disclosed to the Purchaser. The liability for all lump sum death
         benefits which may become payable under the Schemes is fully insured
         with a reputable insurance company. Each of the CUC Group Life
         Assurance Scheme and ComTel Group Life Assurance Scheme is an
         exempt-approved scheme as defined in section 592 of the Income and
         Corporation Taxes Act 1988.

H.       MATERIAL AGREEMENTS

1.       To the best of the Seller's knowledge, and save with respect to the
         Minority Interest Agreements, the Seller has provided the Purchaser
         with (i) the material terms of all agreements material to the conduct
         of the business of the ComTel Companies and the members of the
         Telecential Group; (ii) all change of control provisions material to
         the conduct of the business of the ComTel Companies and members of the
         Telecential Group; (iii) all material exclusive sourcing and/or
         procurement commitments of the ComTel Companies and the members of the
         Telecential Group; (iv) all material construction, network, maintenance
         and/or operating agreements in respect of cable networks and
         programming contracts; and (v) all agreements which would prohibit or
         materially delay the completion of any of the transactions contemplated
         by this Agreement (together "the Material Agreements"). To the best of
         the Seller's knowledge, there are no material unusual restrictions on
         the business of any of the ComTel Companies or the members of
         Telecential Group as currently conducted.

2.       To the best of the Seller's knowledge, the ComTel Companies and the
         members of Telecential Group are not in material default with respect
         to the performance of contractual obligations under any Material
         Agreement.

3.       The signing and performance of this Agreement and all other documents
         which are to be signed at ComTel Completion or Telecential Completion
         will not (i) result in any of the ComTel Companies or members of the
         Telecential Group losing the benefit of any material permit, licence,
         asset, right or privilege which it now enjoys, or (ii) result in a
         material breach or termination of any Material Agreement to which any
         of the ComTel Companies and members of the Telecential Group is a
         party.

4.       To the best knowledge of the Seller, all Material Agreements to which
         any of the ComTel Companies and members of the Telecential Group is a
         party are included in the Data Room Information.

5.       To the best knowledge of the Seller, none of the ComTel Companies or
         members of the Telecential Group is a party to:

         5.1      any partnership, joint venture, European Economic Interest
                  Grouping or consortium arrangement or agreement or any
                  agreement for sharing commissions or other income (save for
                  programming and similar joint ventures);
<PAGE>   58
         5.2      any agreement containing covenants limiting or excluding its
                  right to do business and/or to compete in any area or in any
                  field or with any person, firm or company to a material
                  extent;

         5.3      any material agreement or arrangement suffering from any
                  invalidity or in respect of which there are grounds for
                  determination, rescission, avoidance or repudiation by any
                  other party, the determination, rescission, avoidance or
                  repudiation of which would have a material adverse effect on
                  the financial or trading position of any ComTel Company or
                  member of the Telecential Group.

6.       To the best knowledge of the Seller, no ComTel Company or member of the
         Telecential Group has been or is a party to any material agreement or
         concerted practice which infringes Article 85 of the EEC Treaty or
         constitutes a breach of a dominant position under the EEC Treaty and is
         not in contravention of any regulation or other enactment made under
         Article 87 of the EEC Treaty.

7.       No Indebtedness (actual or contingent) is or will be outstanding and no
         contract exists or will exist immediately following ComTel Completion
         between any of the ComTel Companies and any member of the Seller's
         Group or the Telecential Group (save for the Relationship Agreement.

8.       No contract exists or will exist immediately following Telecential
         Completion between any member of the Telecential Group and any member
         of the Seller's Group.

9.       No member of the Seller's Group is entitled to any claim of any nature
         against any of the ComTel Companies or members of the Telecential Group
         or any of their respective directors, officers and employees (other
         than in connection with the Relationship Agreement).

I.       LITIGATION

         To the best of the knowledge of the Seller (and except for debt
         collection in the ordinary course of trading), none of the ComTel
         Companies or members of the Telecential Group is a party to, has
         received notice of or is threatened with any disputes or civil, fiscal,
         administrative, penal or disciplinary proceedings (including
         arbitration and binding advice proceedings) involving an amount
         individually or in the aggregate, in excess of pound sterling 150,000,
         and to the best of the knowledgE of the Seller, there are no facts or
         circumstances which are reasonably likely to give rise to the same. To
         the best of the knowledge of the Seller, none of the ComTel Companies
         or the members of the Telecential Group are the subject of any
         investigation by any governmental, administrative or regulatory body of
         the United Kingdom or of the European Commission. To the best of the
         knowledge of the Seller, none of the ComTel Companies or members of the
         Telecential Group or any of their respective assets is subject to any
         outstanding judgement, order or attachment which will or is reasonably
         likely to have a material adverse effect on the conduct of the business
         of such ComTel Company or member of the Telecential Group.

J.       BORROWINGS AND BANK FACILITIES

1.       Details of all Indebtedness of the ComTel Companies are contained in
         Schedule Ind.

2.       To the best of the Seller's knowledge, none of the ComTel Companies or
         members of the Telecential Group has given any guarantee, indemnity or
         security which is material to its financial position for the
         obligations of any person other than another ComTel Company (in
<PAGE>   59
         the case of any ComTel Company) or another member of the Telecential
         Group (in the case of any member of the Telecential Group) or in the
         ordinary course of trading.

3.       To the best of the knowledge of the Seller, no material grant, subsidy
         or payment paid or due to be paid to any ComTel Company or member of
         the Telecential Group is liable to be refunded or withheld in whole or
         in part in consequence of any action or omission of such ComTel Company
         or member of the Telecential Group or as a consequence of ComTel
         Completion or Telecential Completion.

K.       PERMITS

1.       To the best of the knowledge of the Seller, the ComTel Companies and
         the members of the Telecential Group have obtained all licences and
         permits necessary or desirable for their current operations and
         businesses that are material for their results and the continuation
         thereof (the "Permits"). To the best knowledge of the Seller, each of
         the Permits is in full force and effect. To the best knowledge of the
         Seller, the ComTel Companies and the members of the Telecential Group
         conduct their respective businesses in accordance with the Permits and
         the terms and conditions relating thereto.

2.       To the best of the knowledge of the Seller, there are no facts or
         circumstances that could give rise to the amendment, cancellation,
         non-prolongation or non-renewal of any of the Permits other than as
         previously disclosed to the Purchaser to the effect that the licences
         for the franchise areas at Daventry, Lichfield and Tamworth may cease
         to be exclusive.

3.       No objection has been notified to the Seller or any of the ComTel
         Companies or members of the Telecential Group by the Department of
         Trade and Industry, Independent Television Commission or the Director
         General of Telecommunications and no proceedings have been threatened
         against the Seller or any of the ComTel Companies or members of the
         Telecential Group by any relevant authority (including without
         limitation by any relevant local authority) which would, if successful,
         have a material adverse effect on the business of any such ComTel
         Company or member of the Telecential Group in relation to any
         construction program of such company or partnership for the
         construction of its prospective cable television and telecommunications
         systems.

L.       ASSETS

1.       Except for assets disposed of in the ordinary course of trading, each
         of the ComTel Companies and members of the Telecential Group is the
         beneficial owner of all assets included in its Annual Accounts and all
         assets which have been acquired by each such company and/or partnership
         since the Balance Sheet Date, all of which assets are in such company's
         or partnership's possession and under its control and there is not now
         outstanding any charge, option, lien, pledge or encumbrance (or
         agreement to grant any such) over the whole or any material part of the
         undertaking, property or assets of any such company or partnership nor
         any right to acquire such, other than retention of title arising in the
         ordinary course of its trade.

2.       Each of the ComTel Companies and members of the Telecential Group owns
         or has a valid licence to use all trademarks, service marks, trade
         names, patents and copyrights (including any registrations or
         applications for registration of any of the foregoing) (collectively,
         the "Intellectual Property") necessary to carry on its business
         substantially as currently conducted except for any Intellectual
         Property the absence of which would not be capable of having a material
         adverse effect on the financial or trading position of the relevant
         ComTel Company
<PAGE>   60
         or member of the Telecential Group. To the best of the knowledge of the
         Seller, none of the ComTel Companies or members of the Telecential
         Group has received any notice of infringement of or conflict with, and,
         to the best of the knowledge of the Seller, there are no infringements
         of or conflicts with the rights of others with respect to the use of,
         or by others with respect to, any Intellectual Property that
         individually or in the aggregate, in either such case, would have a
         material adverse effect on the financial or trading position of such
         ComTel Company or member of the Telecential Group.

3.       To the knowledge of the Seller, all material assets, plant, machinery,
         receiving and other equipment and cable infrastructure currently owned
         by the ComTel Companies and members of the Telecential Group are in
         reasonable working condition for the purpose of their present use and
         application (subject to normal wear and tear) and have been reasonably,
         regularly and properly maintained in all material respects. The ComTel
         Companies own or otherwise have the legal right to use all material
         assets, plant, machinery, receiving and other equipment and cable
         infrastructure, and are party to all material contracts, necessary for
         the ComTel Companies to operate their respective businesses as the same
         are being run at the date of this Agreement. The members of the
         Telecential Group own or otherwise have the legal right to use all
         material assets, plant, machinery, receiving and other equipment and
         cable infrastructure, and are party to all material contracts,
         necessary for the members of Telecential Group to operate their
         respective businesses as the same are being run at the date of this
         Agreement.

M.       INSURANCE

         As of the date of this Agreement, to the best of the Seller's knowledge
         there are no material claims outstanding under any insurance policies
         of any of the ComTel Companies or members of the Telecential Group. To
         the best of the knowledge of the Seller, all policies are in full force
         and effect, all premiums have been fully paid or provided for and no
         policy is threatened with cancellation or an extraordinary premium
         increase.

N.       CAPACITY OF SELLER AND TRANSFERORS

1.       The Seller and each Transferor is a company duly organised and validly
         existing under the laws of the Netherlands or United Kingdom or Canada
         (as the case may be). None of the Seller and the Transferors is
         insolvent nor is any action or request pending to declare the Seller or
         any Transferor insolvent and no request has been filed for a moratorium
         or suspension of payments by the Seller or any Transferor or any
         similar arrangement for the benefit of creditors nor has the same been
         granted.

2.       The Seller and each Transferor has the corporate power to enter into
         this Agreement and to perform its obligations hereunder. This Agreement
         constitutes the legal, valid and binding obligation of each of the
         Seller and the Transferor enforceable against the Seller and each
         transferors in accordance with its terms, subject to laws relating to
         constitutional rights generally and general principles of equity.

3.       The execution of and entering into this Agreement and the consummation
         of the transactions contemplated hereby by the Seller and each
         Transferor has been duly authorised by all necessary corporate and
         other action applicable to the Seller and each Transferor. The
         individuals executing this Agreement on behalf of the Seller and each
         Transferor are duly authorised to do so.
<PAGE>   61
4.       The execution of and entering into this Agreement, and the consummation
         of the transactions contemplated hereby, do not and will not (with or
         without the passage of time or the giving of notice) violate or
         conflict with any provision of any of the Seller's or any Transferor's
         articles of incorporation or by-laws or equivalent constitutional
         documents in the relevant jurisdiction, violate or conflict with any
         law binding upon the Seller or relevant Transferor or any of its
         properties or assets or violate or conflict with, result in a breach
         of, or constitute a default under any agreement or other obligation to
         which the Seller or relevant Transferor is bound.

5.       Except for the notification to various regulatory authorities, no
         consent or approval of, or registration, notification, filing and/or
         declaration with, any court, government or governmental agency, stock
         exchange or self regulatory organisation is required to be given or
         made by the Seller or any Transferor in connection with the execution
         of and entering into this Agreement, and the consummation of the
         transactions and the other agreements and instruments contemplated
         hereby.

O.       EMPLOYEES

1.       True and complete particulars relating to the employment of each of the
         employees of the ComTel Companies and members of the Telecential Group
         whose annual salary is pound sterling 75,000 per annum Or more ("Key
         Employees") are contained in the Data Room Information including
         entitlement to annual salary, private medical care, permanent health
         insurance and company cars and details of any other benefits including
         but not limited to profit sharing, bonus, commission or other incentive
         arrangements whether provided on a contractual or discretionary basis.
         There are no key employees of the ComTel Companies or members of the
         Telecential Group other than the Key Employees.

2.       Copies of any handbooks or works rules or procedures (including any
         disciplinary or grievance procedures) and all collective, procedural,
         recognition or other agreements (whether written or oral) with any
         trade union, works council or other staff association or representative
         and details of any arrangements relating to the election of any person
         as such a representative are contained in the Data Room Information.

3.       To the best of the Seller's knowledge, each of the ComTel Companies and
         members of the Telecential Group has in all material respects complied
         with all its obligations to any of the employees of any of the ComTel
         Companies or members of the Telecential Group ("the Employees") arising
         out of or in connection with: (A) any of their terms and conditions of
         employment and/or customs and practices related thereto; (B) any
         statutes and regulations relevant to their employment including, but
         not limited to, those relating to discrimination by reason of sex, race
         or disability, any duties to inform and consult employees and/or their
         representatives and any obligation to make payments to the UK Inland
         Revenue and to pay National Insurance contributions; and/or (C) any
         orders and awards made in relation to them or any of them.

4.       There are no arrangements, whether contractual or otherwise, entitling
         any of the Employees to any payment or other benefits arising from the
         transactions contemplated hereby.

5.       There are no agreements or arrangements outside the ordinary course of
         trading for the payment of allowances or during any periods of sickness
         or disablement for the benefit of any of the Employees or their
         dependants.
<PAGE>   62
6.       No trade union is recognised in relation to any of the Employees nor
         has any ComTel Company or member of the Telecential Group entered into
         any collective agreements relating to any of the Employees and nor is
         there any works council or other staff association in existence in
         relation to any of the Employees and no person has been elected as a
         representative of any of the Employees nor have any arrangements been
         made for any such election.

P.       WORKING CAPITAL

         To the best of the knowledge of the Seller, none of the ComTel
         Companies nor the members of the Telecential Group have, in the period
         from the Balance Sheet Date until the ComTel Completion Date, deviated
         from the ordinary course of business, consistent with the past
         practice, with respect to working capital practices of such entities
         (working capital being accounts payable, accounts receivable, taxes
         payable, accrued liabilities, other current liabilities, inventions,
         prepaid expenses, and other current assets).
<PAGE>   63
                                   SCHEDULE S

                               PURCHASER SECURITY

                         TERM SHEET FOR PREFERRED STOCK

Issuer:                 NTL Incorporated ("NTL")

Securities Offered:     US$ equivalent of pound sterling 75 million principal
                        amount of 9.90% Non-voting Preferred Stock ("Preferred
                        Stock") (the exchange rate to be determined in
                        accordance with the Sale and Purchase Agreement)

Issue Price:            At par per US$1000 of principal amount at the date of
                        redemption

Issue Date:             The Telecential Completion Date as per the Sale and
                        Purchase Agreement

Dividends:              Dividends will accrue (but not be paid) at a rate of
                        9.90% per annum from the Issue Date until the date of
                        redemption or conversion

Ranking/Liquidation:    Senior to NTL Common Stock

Maturity Date:          10 years from the Issue Date unless previously redeemed
                        or converted

Redemption Date:        At any time at the Issuer's discretion during the 15
                        months from the Issue Date

Optional Redemption:    The Issuer may, at its option only, redeem this Security
                        at any time in the period between the Issue Date and the
                        Redemption Date subject to having provided a Redemption
                        Notice

Redemption Notice:      Not less than 10 days if the Redemption Price is paid in
                        either cash or through the delivery of NTL Common Stock
                        and not less than 30 days if through the delivery of
                        Convertible Preferred Stock, and in each case not more
                        than 60 days prior to the date of the redemption

Redemption Price:       At par for the principal plus any accrued dividends as
                        of the date of redemption. The Redemption Price will be
                        paid, in whole or in part, at the option of the Issuer,
                        either in cash or through the delivery of NTL Common
                        Stock at the then prevailing Current Market Price or
                        through the delivery of the Convertible Preferred Stock
                        at the Issue Price for such stock (as determined by, and
                        subject to the provisions of, the Term Sheet for
                        Convertible Preferred Stock)

Conversion:             If the Issuer has not exercised its right of redemption
                        within 15 months of the Issue Date, the Issuer shall
                        redeem this
<PAGE>   64
                        Security into NTL Common Stock at the then prevailing
                        Current Market Price or cash unless the Issuer has
                        satisfied its obligations under the Term Sheet for the
                        Convertible Preferred Stock and can deliver a
                        Convertible Preferred Stock which satisfies the
                        conditions set out in the Term Sheet for the Convertible
                        Preferred Stock

Current Market Price:   The volume-weighted average of the average high and low
                        sales price of the NTL Common Stock on NASDAQ for each
                        of the 10 trading days ending on the trading day prior
                        to the notice of redemption or the conversion date (as
                        applicable)

Registration Rights:    None

Change of Control:      Will not result in early redemption or conversion;
                        provided this Security will be convertible into new
                        parent common stock or new parent convertible preferred
                        stock with the same Redemption Price, which in turn will
                        be convertible into and redeemable by new parent common
                        stock but otherwise will be on the same terms and
                        conditions.

Pre-emptive rights:     None

Restrictions:           Non-transferable

Holdco Option:          If NTL is reorganised and as a result there is a new
                        parent undertaking of the NTL group, all of whose common
                        stock is traded on NASDAQ or another recognised
                        securities exchange, NTL shall be entitled and obliged
                        to transfer the obligations hereunder to such parent
                        undertaking without the consent of the holder and
                        references to NTL Common Stock herein shall in such
                        circumstances be deemed to refer to the common stock of
                        the new parent undertaking.
<PAGE>   65
                                   SCHEDULE S

                               PURCHASER SECURITY

                   TERM SHEET FOR CONVERTIBLE PREFERRED STOCK

Issuer:                 NTL Incorporated ("NTL")

Securities Offered:     US$[         ] million principal amount of [   ]%
                        Convertible Preferred Stock ("Convertible Preferred
                        Stock")

                        The coupon and principal will be determined by the
                        Issuer. The Issuer must, within 1 month prior to the
                        proposed date of issue of the Convertible Preferred
                        Stock (in the case of (i) below) or within 1 week prior
                        to the proposed date of issue of the Convertible
                        Preferred Stock (in the case of (ii) below) at its
                        discretion either:-

                        (i)    deliver to the holder a letter from an
                               independent investment bank to the holder to the
                               effect that the bank believes on the terms and
                               conditions set out in the letter that the
                               Convertible Preferred Stock, when issued, can be
                               distributed at the Redemption Price of the
                               Preferred Stock (ignoring commissions); such
                               letter shall be based on (i) the marketing
                               efforts that the management of the Issuer is
                               committed to make (dates, schedules, locations
                               and team specified) and (ii) the documentation
                               which the Issuer has committed to make available
                               (text of indenture, SEC-filings, marketing
                               materials etc.) and (iii) the gross spread as
                               reasonably determined by the holder of the
                               Preferred Stock in accordance with normal market
                               practice; or

                        (ii)   deliver to the holder a "bought" sale relating to
                               the sale of the Convertible Preferred Stock which
                               will entitle the holder to receive an amount
                               equal to not less than the Redemption Price of
                               the Preferred Stock.

                        If the Issuer elects for (i) above, it must procure (a)
                        that its management team will be available for a period
                        of not less than 3 business days to make presentations
                        to potential institutional and other purchasers of the
                        Convertible Preferred Stock, such presentations to take
                        place within 3 weeks of the dates specified in the
                        letter from the independent investment bank and (b) that
                        the documentation which it committed to make available,
                        is available.

                        If the Issuer elects for (ii) above, the Issuer may also
                        amend the Conversion Rate so that the Conversion Premium
                        may be the higher of US$60 per share and 30% above the
                        NTL
<PAGE>   66
                        Common Stock price at the time of setting of the
                        Conversion Premium.

Issue Price:            $[      ] per $1000 of principal amount at the
                        Redemption Date.

Costs:                  The Holder will (in case of (i) below) pay for the gross
                        spread or discount. All other costs will be for the
                        Issuer.

                        If the Issuer elects for (i), the Issue Price for the
                        Convertible Preferred Stock will be the higher of the
                        Redemption Price of the Preferred Stock and the price at
                        which the Convertible Preferred Stock can be placed with
                        institutional investors and the principal amount of the
                        Convertible Preferred Stock may be reduced accordingly
                        provided always that the Issue Price is not less than
                        the Redemption Price of the Preferred Stock. If the
                        Issuer elects for (ii) above, the Issue Price shall be
                        at the discretion of the Issuer.

Issue Date:             The date when the Preferred Stock is redeemed

Redemption Date:        10 years from the Issue Date

Dividends:              Dividends will accrue at a rate of [   ]% per annum from
                        the Issue Date until the date of redemption or
                        conversion. For the first two years after the Issue
                        Date, the dividends will simply accrue. Following that
                        period dividends will be paid semi-annually, in whole or
                        in part, at the option of the Issuer, either in cash or
                        through the delivery of NTL Common Stock at the then
                        prevailing Current Market Price or this Security.

Ranking/Liquidation:    Senior to NTL Common Stock

Conversion:             The holder may convert this Security at any time from
                        the Issue Date until the Redemption Date into NTL Common
                        Stock. The Conversion Premium will be at 25% above the
                        NTL Common Stock price at the time of setting of the
                        coupon and principal (reference price average to be
                        agreed during tender)

Optional Redemption:    The Issuer may redeem this Security at any time in the
                        period between three years after the Issue Date and the
                        Redemption Date subject to having provided a Redemption
                        Notice

Redemption Notice       Not less than 30 days nor more than 60 days prior to the
                        date of redemption

Redemption Price:       At par for the principal plus any accrued dividends not
                        paid. The Redemption Price will be paid, in whole or in
                        part, at the option of the Issuer, either in cash or
                        through the delivery of NTL Common Stock at the then
                        prevailing Current Market Price
<PAGE>   67
Current Market Price:   The volume-weighted average of the average high and low
                        sales price of the NTL Common Stock on NASDAQ for each
                        of the 10 trading days ending on the trading day prior
                        to the notice of redemption or conversion (as
                        applicable)

Registration Rights:    Yes

Change of Control:      Will not result in early redemption or conversion;
                        provided this Security will convert into new parent
                        convertible preferred stock, which in turn will be
                        convertible into and redeemable by, inter alia, new
                        parent common stock but otherwise will be on the same
                        terms and conditions.

Pre-emptive rights:     None

Anti-dilution           provisions: Subject to standard provisions relating to
                        anti-dilution, providing customary anti-dilution
                        protection.

Transferable:           Yes

Holdco Option:          If NTL is reorganised and as a result there is a new
                        parent undertaking of the NTL group, all of whose common
                        stock is traded on NASDAQ or another recognised
                        securities exchange, NTL shall be entitled and obliged
                        to transfer the obligations hereunder to such parent
                        undertaking without the consent of the holder and
                        references to NTL Common Stock herein shall in such
                        circumstances be deemed to refer to the common stock of
                        the new parent undertaking.
<PAGE>   68
                                   SCHEDULE T

                                  TAX INDEMNITY

1.       DEFINITIONS AND MEANINGS

1.1      Throughout this Schedule the following words and phrases have the
         meanings set out below:

         "COMPANY" means any person being a member of the Group;

         "COMPLETION" means ComTel Completion so far as it relates to the ComTel
         Companies and Telecential Completion so far as it relates to the
         Telecential Group;

         "COVENTRY COVENANTOR" means Devanha Group plc (registered number SC
         1344278), the "Covenantor" in the Coventry Tax Deed;

         "COVENTRY TAX DEED" means the Tax Deed dated 2 April, 1996 between
         Devanha Group plc, KPN Kabel UK Holding B.V. and Coventry Cable
         Limited, a copy of which is annexed to this Agreement as Exhibit 12;

         "EVENT" means any transaction, act, event, occurrence or omission of
         whatever nature;

         "FLEXTECH COVENANTORS" means the "Covenantors" as defined in clause
         1.2(e) of the Flextech Tax Deed;

         "FLEXTECH TAX DEED" means the Tax Deed dated 17th October 1995 between
         IVS Cable Holdings Limited, Koninklijke PTT Nederland NV and Flextech
         p.l.c, a copy of which is annexed to this Agreement as Exhibit 9;

         "GROUP" means the ComTel Companies and the Telecential Group;

         "LETTERS OF CREDIT" means the letters of credit issued and delivered to
         or available to be drawn by Koninklijke PTT Nederland NV pursuant to
         clause 5 of the Telus 1997 Tax Deed;

         "LIABILITY TO TAXATION" means a liability to make a payment of or an
         amount in respect of Taxation;

         "PROFITS" means income, profits, gains (including capital gains) or the
         value of supplies and any other consideration, value or receipts used
         or charged for taxation purposes;

         "TAXATION" means all taxes, duties, charges, levies, imposts or
         withholdings whenever and by whatever authority imposed and whether of
         the United Kingdom or elsewhere and whether or not any such taxes,
         duties, charges, levies, imposts or withholdings are directly or
         primarily chargeable against or to a Company together with in any such
         case all interest, fines, penalties, surcharges and charges incidental
         or relating to the imposing of any of such taxes, duties, charges,
         levies, imposts or withholdings;

         "TAX ASSESSMENT" means any notice, demand, assessment, letter, return,
         accounts or other document or action taken indicating that a Company is
         placed under a liability to make a payment of or in respect of
         Taxation;
<PAGE>   69
         "TAXATION AUTHORITY" means any Taxation or other authority (whether
         within or outside the United Kingdom) which seeks to impose or
         administers Taxation;

         "TAXES ACT" means the Income and Corporation Taxes Act 1988;

         "TELUS 1995 COVENANTORS" means the companies described in the Telus
         1995 Tax Deed as the "Covenantors";

         "TELUS 1997 COVENANTORS" means the companies described in the Telus
         1997 Tax Deed as the "Covenantors";

         "TELUS 1995 TAX DEED" means the Deed of Tax Covenant dated 6th
         September 1995 between Telus Corporation, 288922 Alberta Ltd and KPN
         Kabel BV, a copy of which is annexed to this Agreement as Exhibit 10;

         "TELUS 1997 TAX DEED" means the Deed of Tax Covenant dated 27th May
         1997 between Telus Corporation, Telus Information Services, Telus Cable
         Holdings and Koninklijke PTT Nederland NV, a copy of which is annexed
         to this Agreement as Exhibit 11;

         "TELUS COMPANY" means a "Company" as defined in clause 1(a) of the
         Telus 1997 Tax Deed;

         "VATA" means the Value Added Tax Act 1994.

1.2      References to Profits being earned, accrued or received on or before a
         particular date or in respect of a particular period shall include
         Profits deemed for taxation purposes otherwise than as a result of
         Profits being pro-rated to have been earned, accrued or received on or
         before that date or in respect of that period.

1.3      References to any payment, dividend or distribution paid or made on or
         before a particular date shall include:

         1.3.1    any payment, dividend or distribution which on or before that
                  date has fallen due to be made; and

         1.3.2    any Event which has occurred on or before that date and is
                  deemed to be a payment, dividend or distribution.

1.4      References to any payment, dividend or distribution shall include
         anything which is deemed, for taxation purposes, to be a payment,
         dividend or distribution.

1.5      References to something being deemed or treated "for taxation purposes"
         in a certain way or at a certain time shall mean that for the purposes
         of any applicable legislation or decided case law relating to or having
         reference to taxation such things are deemed or treated in the way or
         at the time described.

1.6      References to a "person" include references to any persons,
         unincorporated association, body of persons, partnership, trust or
         company.

1.7      References in this Schedule to any statute or statutory provision shall
         be construed first as a reference to such statute or statutory
         provision as is in force at the date of this Agreement and as
         respectively re-enacted or consolidated except that in the case of
         section 767AA Taxes Act
<PAGE>   70
         1988 it means the provision to be enacted with effect in relation to
         changes in ownership occurring, on or after 2nd July, 1997 when the Act
         to be cited as the Finance Act 1998 enters into force and second as a
         reference to any statute or statutory provision of which such statute
         or statutory provision is a re-enactment or consolidation.

1.8      Except as are specifically provided references to paragraphs are to the
         paragraphs of this Schedule.

2.       COVENANT

2.1      Subject to the exclusions and limitations in paragraph 4 the Seller
         covenants to pay to the Purchaser an amount equal to any Liability to
         Taxation of a Company resulting from:

         2.1.1    any Event occurring or deemed, for Taxation purposes, to have
                  occurred on or before Completion; or

         2.1.2    any Profits earned, accrued or received in respect of any
                  period ending on or before Completion.

2.2      Subject to the exclusions and limitations in paragraph 4 the Seller
         hereby agrees with and undertakes to the Purchaser to pay to the
         Purchaser an amount equal to the amount of the reasonable costs and
         expenses reasonably and properly incurred by a Company in connection
         with or in consequence of any Tax Assessment or any claim which results
         in a payment being made by the Purchaser under this paragraph 2.

2.3      Any payment under this Schedule shall constitute a reduction in the
         consideration payable by the Purchaser to the Seller under this
         Agreement.

3.       AMOUNTS PAYABLE TO THE PURCHASER

         The amount of the Liability to Taxation of a Company resulting from a
         Tax Assessment and which is payable to the Purchaser under this
         Schedule shall be the amount of the payment made by a Company in
         respect of the Liability to Taxation.

4.       EXCLUSIONS AND LIMITATIONS

4.1      The Seller shall not have a liability under this Schedule to the extent
         that:

         4.1.1    provision or reserve in respect of such Liability to Taxation
                  was made in the Completion Balance Sheet; or

         4.1.2    the Liability to Taxation arises or is increased as a result
                  of the ordinary and usual course of trading of a Company which
                  is a member of the Telecential Group since the ComTel
                  Completion Date; or

         4.1.3    the Liability to Taxation arises or is increased as a result
                  of any increase in the rates of Taxation made after the date
                  of this Agreement with retrospective effect or as a result of
                  any change in law occurring after the date of this Agreement
                  with retrospective effect; or

         4.1.4    the Liability to Taxation would not have arisen but for a
                  voluntary act or deliberate or negligent omission of a Company
                  and/or the Purchaser after Completion otherwise
<PAGE>   71
                  than in the ordinary course of business of a Company and in
                  circumstances in which a Company or the Purchaser, as the case
                  may be, was aware or ought reasonably to have been aware that
                  the act or omission would give rise to the Liability to
                  Taxation; or

         4.1.5    the Liability to Taxation would not have arisen or would have
                  been reduced or eliminated but for a failure or omission on
                  the part of a Company after Completion to make any claim,
                  disclaimer or election the making of which was taken into
                  account in computing any provision or reserve for Taxation in
                  the Completion Balance Sheet; or

         4.1.6    the Liability to Taxation would not have arisen but for a
                  change after Completion of the date to which any of the
                  Companies makes up its accounts; or

         4.1.7    the Liability to Taxation would not have arisen or been
                  increased but for a failure on the part of the Purchaser or a
                  Company to comply with the provisions of paragraph 6 or of
                  Article 11.1 or 11.2 of this Agreement.

4.2      For the purposes of paragraph 4.1.2, "normal course of trading"
         excludes, without limitation:

         4.2.1    the payment of any dividend or the making of any distribution;
                  or

         4.2.2    the disposal or realisation or acquisition of any asset
                  (including trading stock) in circumstances to the extent that
                  the consideration (if any) actually received (or due to be
                  received) or given (or due to be given) for such disposal or
                  realisation or acquisition is less than (or in the case of an
                  acquisition is more than) the consideration deemed to be or
                  have been received or given for taxation purposes; or

         4.2.3    the supply or receipt of any service or business facility of
                  any kind (including the lending of money or the letting,
                  hiring, licensing or creation of any tangible or intangible
                  property or rights) in circumstances where consideration
                  received (or due to be received) is less than (or in the case
                  of a receipt of a service is more than) that which is deemed
                  to be received or given for taxation purposes; or

         4.2.4    any Event which results in a Company becoming liable to bear a
                  Liability to Taxation directly or primarily chargeable against
                  or attributable to another person, firm or company or any
                  Event which results in a Company becoming liable to pay or
                  bear a Liability to Taxation under Part VIII of the Taxes
                  Management Act 1970 (charges on non-residents), or section 118
                  of Schedule 23 to the Finance Act 1995 (obligations imposed on
                  UK representatives) or section 48 of the Value Added Tax Act
                  1994 (representative members),

         but only where the relevant occurrence occurred or is deemed, for
         Taxation purposes, to have occurred after the ComTel Completion Date
         but on or before Telecential Completion.

4.3      The provisions of Articles 9.6.1, 9.6.2, 9.7 and 9.8 of the Agreement
         (but no other, including, without limitation, Articles 9.12 and 9.14)
         shall apply to limit the liability of the Seller under this Schedule.
<PAGE>   72
5.       WITHHOLDING AND DEDUCTIONS

5.1      All sums payable by the Seller to the Purchaser under this Schedule
         other than interest shall be paid free and clear of all deductions or
         withholdings whatsoever save only as may be required by law. If any
         such deductions or withholdings are required by law the Seller shall be
         obliged to pay such sum as will after such deduction or withholding has
         been made leave the amount the recipient would have been entitled to
         receive in the absence of any such requirement to make a deduction or
         withholding.

5.2      In the event that any sum paid to the Purchaser as a result of the
         obligations contained in this Schedule or in the Agreement will be
         subject to Taxation the Seller shall be obliged to pay such sum as
         will, after payment of the Taxation so charged, leave a sum equal to
         the amount that would otherwise be payable under any such obligation.

6.       CONDUCT OF CLAIMS

6.1      Subject to paragraphs 6.4 and 6.5, if the Purchaser or a Company
         becomes aware of a Tax Assessment relevant for the purposes of this
         Schedule, the Purchaser shall, or shall procure that a Company shall,
         give written notice thereof to the Seller within ten Business Days if
         the Tax Assessment is subject to a time limitation of 30 days or less
         for an appeal and otherwise within 25 Business Days but so that the
         giving of notice under this paragraph shall not be a condition
         precedent to the making of a claim under this Schedule unless the
         Seller is wholly prevented by the lack of notice from avoiding,
         resisting, appealing or compromising the Tax Assessment or from making
         a claim under any Tax Deed mentioned in paragraph 6.5. The Purchaser
         shall procure that a Company shall (if the Seller shall indemnify the
         Company concerned to the reasonable satisfaction of the Purchaser
         against all losses, costs, damages and expenses, including, without
         limitation, interest on overdue Taxation, which may be incurred
         thereby) take such action and give such information and assistance in
         connection with the affairs of the Company concerned as the Seller may
         reasonably and promptly by written notice request to avoid, resist,
         appeal or compromise the Tax Assessment.

6.2      Subject to sub-paragraph 6.3 the actions which the Seller may
         reasonably request under sub-paragraph 6.1 shall include (without
         limitation) the procuring of the Company concerned to apply to postpone
         (so far as legally possible) the payment of any Taxation and/or
         allowing the Seller to take on or take over at its own expense the
         conduct of all or any proceedings of whatsoever nature arising in
         connection with the Tax Assessment in question, and, if the Seller
         takes on or takes over the conduct of proceedings, the Purchaser shall
         provide and shall procure that the Company concerned shall provide such
         information and assistance as the Seller may reasonably require in
         connection with the preparation for and conduct of those proceedings.

6.3      If the Seller elects to have conduct of a Tax Assessment in accordance
         with the provisions of this paragraph the Purchaser shall be kept
         informed of all matters pertaining thereto and all steps proposed to be
         taken by the Seller and shall be sent copies of all material
         correspondence in connection with the Tax Assessment in question.

6.4      In the case of a Liability to Taxation mentioned in sub-clause 2(2) of
         the Telus 1997 Tax Deed arising as a result of a Telus 1997 Covenantor
         or a Telus Company failing to perform its obligations under clause 2(1)
         of that Deed, the notice mentioned in paragraph 6.1 shall be given
         within fourteen days if that is earlier than within ten Business Days
         and shall also in accordance with paragraph 6.5 below be given to the
         Telus 1997 Covenantors at the same time.
<PAGE>   73
6.5      The Purchaser shall, and shall procure that the Companies shall, do all
         such things and give the Seller such cooperation and assistance as is
         reasonably required to enable it to comply with the provisions of any
         of the Telus 1995 Tax Deed, the Telus 1997 Tax Deed (including the
         Letters of Credit), the Flextech Tax Deed and the Coventry Tax Deed
         (the "Tax Deeds") in order to make and conduct a claim under the
         provisions of any of the Tax Deeds in respect of a Liability to
         Taxation mentioned in paragraph 2.1 or any costs or expenses mentioned
         in paragraph 2.2, obtain payment in respect of the claim and otherwise
         comply with its responsibilities under each Tax Deed and in particular
         it will procure that any notice required to be given to the Seller
         pursuant to paragraph 6.1 shall also at the same time be given to the
         Telus 1995 Covenantors, the Telus 1997 Covenantors, the Flextech
         Covenantors and the Coventry Covenantor, as the case may be, where a
         claim would or might be capable of being made under the provisions of
         the relevant Tax Deed.

6.6      Notwithstanding any other provisions of this paragraph 6, the Purchaser
         shall not be obliged to comply with this paragraph 6 where to do so
         would require the disclosure by the Purchaser of any information the
         subject of confidentiality obligations owed to any third party.

7.       DUE DATE FOR PAYMENT

7.1      Subject to sub-paragraph 7.2, where a Tax Assessment to which this
         Schedule applies requires the Purchaser or a Company to make a payment
         in respect of a Liability to Taxation, the Seller shall pay to the
         Purchaser or the relevant Taxation Authority (as the case may be) the
         amount claimed in respect of that Tax Assessment under this Schedule
         and any further amount which the Seller is liable to pay by virtue of
         paragraph 5 on or before the date which is the later of the date five
         Business Days after formal written demand is made by the Purchaser and
         the second Business Day prior to the date on which the Taxation in
         question is payable to the Taxation Authority demanding the same.

7.2      If the date for payment of the Taxation is deferred following
         application to the appropriate Taxation Authority the date for payment
         by the Seller shall be such later date when the amount of Taxation is
         finally determined to be due to such Taxation Authority demanding the
         same. For this purpose, an amount of Taxation shall be deemed to be
         finally determined when, in respect of such amount, an agreement under
         Section 54 of the Taxes Management Act 1970 or any legislative
         provision corresponding to that section for the purposes of the
         relevant tax is made or a decision of a court of tribunal is given from
         which either no appeal lies or in respect of which no appeal is made
         within the prescribed time limit.

8.       REIMBURSEMENT FROM THIRD PARTIES

8.1      This paragraph applies if:

         8.1.1    the Seller makes a payment under paragraph 7 in respect of a
                  payment of Taxation;

         8.1.2    subsequently and before the sixth anniversary of ComTel
                  Completion the Purchaser or a Company receives from any person
                  (other than the Purchaser or another Company) a payment in
                  respect of the Taxation in question; and

         8.1.3    in the case of a payment to a Company, the Company is at the
                  time of receipt a 75 per cent. subsidiary of the Purchaser or,
                  in the case of a Company which is a partnership at the date of
                  this Agreement, a 75 per cent subsidiary of the Purchaser is,
                  or 75 per cent subsidiaries of the Purchaser together are,
                  entitled to 75 per cent of the profits of
<PAGE>   74
                  the Company or of the profits of the trade, (as the case may
                  be). For the purposes of this paragraph, a 75 per cent
                  subsidiary is a 75 per cent subsidiary for the purposes of
                  section 838(1) Taxes Act 1988.

8.2      If this clause applies, the Purchaser shall repay to the Seller (or
         procure the repayment to it of) the amount received (less any costs of
         recovering the amount and any payment of Taxation on such amount) to
         the extent that it does not exceed the payment originally made by the
         Seller.

9.       OVERPROVISIONS

9.1      The Seller may (at its request and expense) require the auditors for
         the time being of a Company to certify the existence and amount of any
         Overprovision and the Purchaser shall provide, or procure that the
         Company provides, any information or assistance required for the
         purpose of production by the auditors of a certificate to that effect.

9.2      If the auditors certify the existence of an Overprovision then it shall
         be dealt with as follows:-

         9.2.1    any Overprovision shall first be set against any payment then
                  due from the Seller under this Schedule;

         9.2.2    to the extent there is an excess, a refund shall be made to
                  the Seller of any previous payment or payments made by the
                  Seller under this Schedule (and not previously refunded) up to
                  the amount of the excess; and

         9.2.3    to the extent that the excess referred to in sub-paragraph
                  9.2.2 is not exhausted under that sub-paragraph, the remainder
                  of that excess shall be carried forward and set against any
                  future payment or payments which become due from the Seller
                  under this Schedule.

         9.3      For the purposes of this clause an Overprovision exists if any
                  Taxation liability has been overstated in the Completion
                  Balance Sheet, or such Taxation liability has been discharged
                  or satisfied below the amount attributed thereto in the
                  Completion Balance Sheet.

10.      COUNTER INDEMNITY

10.1     The Purchaser hereby covenants with the Seller to pay to the Seller by
         way of adjustment to the consideration payable by the Purchaser to the
         Seller under this Agreement, an amount equivalent to:

         10.1.1   any Taxation for which the Seller or any other person falling
                  within section 767A(2) or section 767AA(4) of the Taxes Act
                  becomes liable by virtue of the operation of section 767A,
                  767AA and 767B of the Taxes Act in circumstances where the
                  taxpayer company (as referred to in section 767A(1) of the
                  Taxes Act) or the transferred company (as referred to in
                  section 767AA(1) of the Taxes Act) is a Company; and

         10.1.2   any other Taxation for which the Seller becomes liable as a
                  result of the failure by a Company to discharge it.

10.2     The covenant contained in paragraph 10.1 shall:
<PAGE>   75
         10.2.1   extend to any reasonable costs properly incurred by the Seller
                  or such other person in connection with such Taxation or claim
                  under paragraph 10.1 above;

         10.2.2   not apply to Taxation to the extent that the Purchaser could
                  claim payment in respect of it under paragraph 2;

         10.2.3   not apply to the extent that the Seller has already made
                  recovery in respect of the Taxation in question pursuant to
                  section 767B(2) of the Taxes Act.

10.3     Paragraphs 6 and 7 (conduct of claims and due date for payment) shall
         apply to the covenants contained in paragraph 10.1 above as they apply
         to the covenants contained in paragraph 2, replacing references to the
         Seller by the Purchaser (and vice versa) and making any other necessary
         modifications.

11.      VAT - COMTEL COMPLETION

11.1     In this clause:

         11.1.1   "PRE-SALE GROUP" means the group registration for value added
                  tax purposes registered under number 541 7002 81; and

         11.1.2   "RELEVANT VAT" means VAT (but not related interest or
                  penalties), attributable to supplies, acquisitions and imports
                  by the ComTel Companies, less input tax deductible from it on
                  supplies to and acquisitions and imports by the ComTel
                  Companies, but excluding any VAT to the extent that it would,
                  if paid by the Purchaser or by any of the ComTel Companies,
                  give rise to a claim under this Schedule (and for the purpose
                  of Articles 9.6.1, 9.6.2 and 9.7 any VAT so excluded shall be
                  treated as a liability of the Seller under this Schedule
                  claimed by the Purchaser).

         11.1.3   If the Relevant VAT is a positive number, there shall be no
                  "Seller's VAT" and the amount of the "Purchaser's VAT" shall
                  be equal to the amount of the Relevant VAT. If the Relevant
                  VAT is a negative number, there shall be no "Purchaser's VAT"
                  and the amount of the "Seller's VAT" shall be a positive
                  number equal to the absolute value of the Relevant VAT.

11.2     In determining for the purposes of paragraph 11.1 by or to whom a
         supply, acquisition or import is made, section 43(1)(b) of the Value
         Added Tax Act 1994 shall be ignored.

11.3     The Seller and the Purchaser shall co-operate to procure that the
         ComTel Companies leave the Pre-Sale Group as of Completion, so far as
         they are still members and that ComTel Cable Services Limited is
         replaced as representative member of any continuing group of which any
         Company which is not a ComTel Company is a member.

11.4     The Purchaser shall procure that the ComTel Companies pay to the
         representative member of the Pre-Sale Group, the amount of any
         Purchaser's VAT which is to be paid by the Seller or any member of a
         Pre-Sale Group (other than a ComTel Company) to any Taxation Authority,
         such payment to be made in cleared funds not later than three Business
         Days before it is due to the relevant Taxation Authority. The Seller
         shall procure that the Telecential Partnerships shall pay to the
         relevant ComTel Companies the amount of any Seller's VAT which may be
         reclaimed or credited against output tax by the Seller or any member of
         the Pre-Sale Group
<PAGE>   76
         (other than a ComTel Company), such payment to be made in cleared funds
         on the date the representative member of the Pre-Sale Group obtains the
         benefit of the credit by reducing a payment of VAT otherwise due or one
         Business Day after it receives repayment of VAT reclaimed by it (as the
         case may be). Where the amount of the Relevant VAT is subsequently
         adjusted or discovered to be incorrect (under an end of year adjustment
         or otherwise), the Purchaser or Seller shall as soon as is practicable
         after such adjustment or discovery procure the appropriate payment is
         made to effect the adjustment.

11.5     The Purchaser shall on request provide or procure to be provided to the
         Seller (or as it directs) any information and documents in the
         possession, custody or power of the Purchaser or any of the ComTel
         Companies required by any Company in any Pre-Sale Group in connection
         with calculating the VAT liability of the Pre-Sale Group or complying
         with any requirement to submit an EC sales list or Intrastat
         declarations.

11.6     The provisions of this paragraph 11 shall cease to have effect
         immediately following the Telecential Completion.

12.      VAT-TELECENTIAL COMPLETION

12.1     The Seller and the Purchaser shall cooperate in obtaining a
         determination from HM Customs & Excise as to the manner in which the
         sales and assignments mentioned in Articles 2.1, 2.2, 2.3.2, 2.3.3,
         2.3.4, 2.4.2, 2.4.3, 2.5.2 and 2.5.3 (the "Partnership Transfers") are
         to be treated for value added tax purposes, including, but not limited
         to, the extent to which the Partnership Transfers are to be left out of
         account for the purposes mentioned in section 45(1) VATA or treated as
         the transfer of a business as a going concern for the purposes of
         section 49 VATA and article 5(1) of the Value Added Tax (Special
         Provisions) Order 1995.

12.2     If HM Customs & Excise shall determine that value added tax is
         chargeable in respect of any, or any part of, the Partnership Transfers
         and/or any other sale of Assets pursuant to this Agreement, the Seller
         shall procure delivery to the Purchaser of an appropriate tax invoice
         for value added tax purposes, against which the Purchaser shall pay to
         the relevant Transferor the amount of value added tax chargeable in
         respect of the Partnership Transfers and/or the sale of Assets.

12.3     The Seller and the Purchaser shall cooperate in ensuring that notice is
         given to HM Customs & Excise immediately after Completion of the change
         in each of the Telecential Partnerships which is either separately
         registered for value added tax purposes or included as a member of a
         VAT group pursuant to section 43 VATA or any concessional treatment
         available in connection with that section.

12.4     Each of the Seller and the Purchaser agrees that the working papers of
         the Purchaser's Accountant used in drawing up the Completion Balance
         Sheet and arriving at any provision for liability to VAT contained in
         it will represent a proper basis for determining for the purposes of
         section 45(5) VATA what proportion of the firm's liability is the VAT
         liability of each person who has been a partner in the Telecential
         Partnership in the prescribed accounting period in which Completion
         occurs for the purposes of section 45(5) VATA and that it will conduct
         any correspondence with HM Customs & Excise on that basis.

                                   SCHEDULE V

                         RESIGNATION FORMAT : DIRECTORS
<PAGE>   77
To:      The Directors
         Limited
         [Registered Office]


Date:    [            ], 1998



Dear Sir[s],

[                       ] Limited(the "Company")

I resign as a director/the secretary of the Company with effect from the end of
the board meeting to be held on [the ComTel Completion Date/the Telecential
Completion Date].

Subject as provided below I confirm that I have no claim whatsoever against the
Company and/or its officers and employees in respect of any cause, matter or
thing (including, but without limitation, for unfair or wrongful dismissal and
redundancy), but to the extent that any such claim exists or may exist, I hereby
irrevocably waive such claim and hereby release the Company from any liability
whatsoever in respect thereof.

Notwithstanding the foregoing, this waiver shall not extent to any indemnity to
which I might be entitled at law or under the articles of association of the
Company in respect of any act, matter or thing done, permitted or suffered by me
in good faith whilst a director/the secretary of the Company and in any capacity
as such or to the payment of my remuneration accrued to date and the
reimbursement of any expenses properly incurred by me in the performance of my
duties to date.

IN WITNESS whereof I have executed this as a deed the day and year first above
written.


SIGNED and DELIVERED           )
by [            ]              )
in the presence of:            )
<PAGE>   78
                                   SCHEDULE Y

                        FORMAT : PURCHASER'S CONFIRMATION

The Purchaser hereby declares to the Seller and confirms:

1.       that the representations and warranties set out in Article 8 of the
         Sale and Purchase Agreement for the Assets entered into between, inter
         alia, Vision Networks III B.V., ComTel UK Finance B.V. and NTL Group
         Limited ("the Sale and Purchase Agreement") dated o 1998 are true and
         correct as on the date of this Confirmation; and

2.       that save as disclosed above, the Purchaser is not aware of any matter
         or thing which constitutes a material breach of the representations and
         warranties set out in Schedule R of the Sale and Purchase Agreement.

Words and phrases defined in the Sale and Purchase Agreement shall have the same
meanings in this Confirmation.

Signed in (place) on this (day) of (month) 199o.



____________________________________
For    :     The Purchaser
By     :     (Print name)
Its    :     (Print title)
<PAGE>   79
                                   SCHEDULE Z

                                THE COMTEL GROUP
<PAGE>   80
                                                                  CONFORMED COPY


                     AGREEMENT FOR THE SALE AND PURCHASE OF


                          THE VISION NETWORKS UK GROUP



                                 by and between



                            VISION NETWORKS III B.V.
                    (hereinafter referred to as the "Seller")



                             COMTEL UK FINANCE B.V.
                         VISION NETWORKS (UK) I LIMITED
                     TELECENTIAL COMMUNICATIONS (CANADA) LTD
                         VISION NETWORKS (UK) II LIMITED
                     TELECENTIAL COMMUNICATIONS (UK) LIMITED
                VISION NETWORKS UK HOLDING B.V. (IN LIQUIDATION)
                 (HEREINAFTER REFERRED TO AS THE "TRANSFERORS")


                                       and



                                NTL GROUP LIMITED
                  (hereinafter referred to as the "Purchaser")

                                       and

                                    NTL INC.
                       (hereinafter referred to as "NTL")






                                  ALLEN & OVERY
                                   C2:232559.1
<PAGE>   81
                                INDEX OF ARTICLES

Article 1      :     Definitions and Interpretation

Article 2      :     Sale, Purchase, Purchase Price

Article 3      :     Signing of this Agreement, and
                     Covenants to Completion

Article 4      :     ComTel Completion, Payment, Telecential Completion,
                     Payment

Article 5      :     Actions at ComTel Completion and Actions at Telecential
                     Completion

Article 6      :     Completion Balance Sheet

Article 7      :     Due Diligence, Warranties and Acknowledgements

Article 8      :     Warranties of the Purchaser and NTL

Article 9      :     Breach and Non-Fulfilment

Article 10     :     Secrecy

Article 11     :     Tax Affairs Post Completion

Article 12     :     Miscellaneous

Article 13     :     Repayment of Indebtedness

Article 14     :     Assignment of contracts

Article 15     :     Minority Interests provisions
<PAGE>   82
                               INDEX OF SCHEDULES

Schedule A    :      Apportionment of Purchase Price

Schedule B    :      Board Resolution (Article 2, 5.2 and 5.3.5)

Schedule C    :      Covenants to Telecential Completion

Schedule D    :      Defined Terms

Schedule F    :      Guarantee

Schedule I    :     Data Room Information

Schedule J    :     Stikeman, Elliott Opinion Letter

Schedule K    :     Skadden Arps Slate Meagher & Flom LLP Opinion Letter

Schedule Ind  :     Indebtedness (Article 4.5)

Schedule M    :     Relationship Agreement

Schedule O, P, Q:   Deeds of Retirement and Appointment.

Schedule R    :     Representations and Warranties

Schedule S    :     Purchaser Security

Schedule T    :     Tax Indemnity

Schedule V    :     Resignation of Directors

Schedule Y    :     Format: Purchaser's Confirmation

Schedule Z    :     The ComTel Group


Schedule AA   :     Deloitte & Touche Letter
<PAGE>   83
                        INDEX OF EXHIBITS TO SCHEDULE R:


Exhibit 1     :      Management Accounts


<PAGE>   1
  SUPPLEMENTAL AGREEMENT TO A SALE AND PURCHASE AGREEMENT DATED 16TH JUNE 1998
   ENTERED INTO BETWEEN INTER ALIA VISION NETWORKS III BV, COMTEL UK FINANCE
     B.V. AND NTL GROUP LIMITED IN RESPECT OF THE SALE AND PURCHASE OF THE
                            VISION NETWORKS UK GROUP

This Supplemental Agreement is made on the 22nd day of September 1998 by and
between:-

(1) VISION NETWORKS III B.V., a private limited liability company incorporated
in accordance with the laws of the Netherlands and having its registered office
at Hoofddorp and its principal place of business at Polarisavenue 41,2132 JH
Hoofddorp the Netherlands, for the purposes hereof duly represented by W.C.M.
van der Hoeven (hereinafter referred to as the "Seller");

(2) COMTEL UK FINANCE B.V. a private limited liability company incorporated in
accordance with the laws of the Netherlands and having its registered office at
Hoofddorp and its principal place of business at Polarisavenue 41,2132 JH
Hoofddorp the Netherlands for the purposes hereof duly represented by W.C.M. van
der Hoeven (hereinafter referred to as "ComTel");

(3) VISION NETWORKS (UK) I LIMITED, a private limited liability company
incorporated in England and having its registered office at Wharfedale Road,
Winnersh, Wokingham, Berkshire RG41 5TZ (hereinafter referred to as "UKI");

(4) TELECENTIAL COMMUNICATIONS (CANADA) LTD, a private limited liability company
incorporated in the Province of New Brunswick, Canada and having its registered
office at 300 Consilium Pl., Suite 1300, Scarborough, Ont. M1H 3G2 (hereinafter
referred to as "Canco 1");

(5) VISION NETWORKS (UK) II LIMITED, a private limited liability company
incorporated in England and having its registered office at Wharfedale Road,
Winnersh, Wokingham, Berkshire, RG41 5TZ (hereinafter referred to as "UKII");

(6) TELECENTIAL COMMUNICATIONS (UK) LIMITED, a private limited liability company
incorporated in the Province of New Brunswick, Canada and having its registered
office at 300 Consilium Pl., Suite 1300, Scarborough, Ont. M1H 3G2 aforesaid
(hereinafter referred to as "Canco 3");

(7) VISION NETWORKS UK HOLDING B.V. (IN LIQUIDATION) a private limited liability
company incorporated in accordance with the laws of the Netherlands and having
its registered office at Hoofddorp and its principal place of business at
Polarisavenue 41,2132 JH Hoofddorp the Netherlands for the purposes hereof duly
represented by its liquidator ComTel U.K. Finance B.V., represented by W.C.M.
van der Hoeven (hereinafter referred to as "VNUK")

(ComTel, UKI, Canco 1, UKII, Canco 3 and VNUK being hereafter referred to
jointly as the "Transferors" and individually as a "Transferor");

(8) VISION NETWORKS HOLDINGS B.V. a private limited liability company
incorporated in accordance with the laws of the Netherlands and having its
registered office at Hoofddorp and its principal place of business at
Polarisavenue 41,2132 JH Hoofddorp the Netherlands, for the purposes hereof duly
represented by W.C.M. van der Hoeven;
<PAGE>   2
(9) NTL GROUP LIMITED, a private limited liability company incorporated in
England and having its registered office at Bristol House, 1 Lakeside Road,
Farnborough, Hampshire, England (hereinafter referred to as the "Purchaser");

(10) NTL INC, a company incorporated and existing in accordance with the laws of
the State of Delaware, USA and having its principal place of business at 110
East 59th Street, 26th Floor, NYC 10022, USA (hereinafter referred to as the
"NTL");

(11) CABLETEL INVESTMENTS LIMITED, a private limited liability company
incorporated in England and having its registered office at Bristol House, 1
Lakeside Road, Farnborough, Hampshire, England (hereinafter referred to as
"CableTel Investments Limited");

(12) CABLETEL LIMITED, a private limited liability company incorporated in
England and having its registered office at Bristol House, 1 Lakeside Road,
Farnborough, Hampshire, England (hereinafter referred to as "CableTel Limited");
and

(13) NTL LIMITED, a private limited liability company incorporated in England
and having its registered office at Bristol House, 1 Lakeside Road, Farnborough,
Hampshire, England (hereinafter referred to as "NTL Limited").

WHEREAS

A.    The Seller, the Transferors, the Purchaser and NTL entered into a Sale and
      Purchase Agreement dated 16th June 1998 ("the Agreement");

B.    The parties to the Agreement wish to make certain amendments to the
      Agreement.

IT IS HEREBY AGREED AS FOLLOWS:-

1.    Articles 2 and 5.3 of the Agreement provide for the sale and assignment of
      various Partnership Interests to the Purchaser or its nominee. The
      Purchaser hereby nominates CableTel Investments Limited, CableTel Limited
      and NTL Limited for the purposes of Articles 2 and 5.3 of the Agreement to
      the extent set out in and in accordance with the following provisions of
      this Article. Accordingly, Articles 2 and 5.3 of the Agreement shall be
      varied so that:-

      1.1   UK I shall sell and assign absolutely its Partnership Interest as a
            general partner in the Telecential Communications Partnership to
            CableTel Investments Limited which Canco 1 and UK I shall procure
            becomes a general partner of the Telecential Communications
            Partnership ("P1") (and by virtue thereof a general partner of the
            Telecential Communications (Herts) Partnership ("P3") and the
            Telecential Communications (Northants) Partnership) ("P4") in place
            of UK I;

      1.2   UK II shall assign absolutely all its Partnership Interest as a
            limited partner in LP5 to NTL Limited and Canco 3 and UK II shall
            procure that NTL Limited becomes a limited partner of LP5 in place
            of UK II;

      1.3   VNUK shall assign absolutely all its Partnership Interest as a
            limited partner in LP6 to NTL Limited and Canco 3 and VNUK shall
            procure that NTL Limited becomes a limited partner of LP6 in place
            of VNUK;


                                       2
<PAGE>   3
      1.4   Canco 1 shall sell and assign absolutely all its Partnership
            Interest as managing general partner in P1 to CableTel Limited and
            Canco 1 and UK I shall procure that CableTel Limited becomes
            managing general partner of P1 (and by virtue thereof, a general
            partner of P3 and P4) in place of Canco 1; and

      1.5   Canco 3 shall sell and assign absolutely all its Partnership
            Interest as managing general partner in LP5 and LP6 to CableTel
            Limited and Canco 3 and UK II and Canco 3 and VNUK respectively
            shall procure that CableTel Limited becomes managing general partner
            of LP5 and LP6 respectively in place of Canco 3.

      and for the purposes of effecting the same, Canco 1, Canco 3, UK I, UK II,
      VNUK, CableTel Limited, CableTel Investments Limited and NTL Limited shall
      enter into Deeds of Retirement and Appointment in the forms contained in
      Schedules O, P and Q to the Agreement.

      The Partnership Interests to be sold and/or assigned to CableTel
      Investments Limited, NTL Limited and CableTel Limited (as the case may be)
      shall be sold to CableTel Investments Limited, CableTel Limited and/or NTL
      Limited absolutely in their own right and not on behalf of the Purchaser.

2.    Article 7 of the Agreement and Schedule R thereto shall be varied:-

      2.1   so that, subject as provided in those provisions of Article 7 not
            hereby varied, the representations and warranties in respect of the
            Telecential Group given by the Seller and the Transferors shall be
            given to each of the Purchaser, CableTel Investments Limited, NTL
            Limited and CableTel Limited except that no such warranties and
            representations shall be given in respect of the Further
            Subsidiaries (as defined in clause 12 below) or:-

            2.1.1 to CableTel Investments Limited in respect of LP5, LP6,
                  Heartland Cablevision (UK) Limited, Heartland Cablevision II
                  (UK) Limited, ComTel Limited, Maza Limited, Herts Cable
                  Limited and Northampton Cable Television Limited;

            2.1.2 to the Purchaser in respect of the Telecential Group other
                  than ComTel Limited, Maza Limited, Herts Cable Limited and
                  Northampton Cable Television Limited;

            2.1.3 to NTL Limited in respect of the Telecential Group other than
                  LP5, LP6, Heartland Cablevision (UK) Limited and Heartland
                  Cablevision II (UK) Limited; or

            2.1.4 to CableTel Limited in respect of ComTel Limited, Maza
                  Limited, Herts Cable Limited and Northampton Cable Television
                  Limited; and

      2.2   so that any claim arising out of a breach of such representations
            and warranties given by the Seller and the Transferors may be
            brought by each of the Purchaser, NTL Limited, CableTel Limited and
            CableTel Investments Limited (as applicable),


                                       3
<PAGE>   4
      Provided that for the avoidance of doubt, references in Article 9 to the
      Purchaser shall be deemed to refer also to NTL Limited, CableTel Limited
      and/or CableTel Investments Limited (as the case may be) in respect of any
      such claim as may be brought by any of them in respect of any Breach or
      Non-fulfilment.

3.    Article 12.15 of the Agreement shall be varied so that references to the
      Purchaser shall also refer to each of CableTel Investments Limited,
      CableTel Limited and NTL Limited and references in such Article to the
      "Agreement" shall include the Deeds of Retirement and Appointment referred
      to in clause 1 above.

4.    Article 6.4 of the Agreement shall be varied so that the number and words
      "80 (in words : eighty)" shall be inserted in substitution for the number
      and words "70 (in words : seventy)" where they appear in the second line
      of Article 6.4 of the Agreement and the number and words "90 (in words :
      ninety)" shall be inserted in substitution for the number and words "80
      (in words : eighty)" where they appear in the fourth line of Article 6.4
      of the Agreement.

5.1   Article 4.3 of the Agreement shall be varied so that completion of the
      sale and purchase of the Telecential Assets will take place at the offices
      of Allen & Overy in London, UK on 22 September 1998 (which,
      notwithstanding any other provision of the Agreement, shall for the
      purposes of the Agreement be the "Telecential Completion Date") when the
      transfer of the Telecential Assets will take place in accordance with
      Article 5.3 of the Agreement except that the deeds of retirement and
      appointment referred to in Articles 5.3.2, 5.3.3 and 5.3.4 of the
      Agreement shall be signed by Canco 1, UK I, Canco 3, UK II and VNUK in the
      Netherlands and delivered to the offices of Travers Smith Braithwaite,
      Douglas, Isle of Man on such date and the counterparts of such deeds of
      retirement and appointment shall be signed by CableTel Investments
      Limited, CableTel Limited and NTL Limited at Douglas, Isle of Man and
      delivered to the offices of Loeff Claeys Verbeke, Amsterdam, the
      Netherlands on behalf of the Seller and the Transferors on such date.

5.2   Article 5.3.1(b) shall be amended by the inclusion of the words ",
      Pirunico Nominees (Jersey) Limited or Praetor Trust Company Limited" after
      the words "other than those appointed by Pirunico Trustees (Jersey)
      Limited".

5.3   Article 5.3.6 of the Agreement shall be varied so that:-

      5.3.1 the Seller's obligations in respect of the passing of Board
            Resolutions of HCL and NCTL (as defined in Article 15 of the
            Agreement) shall be to use its reasonable endeavours, subject to the
            provisions of the Minority Interest Agreements (as similarly
            defined), to procure the passing of such Resolutions; provided that
            the Seller shall in any event procure the appointment of the
            Purchaser's nominees as directors of HCL and NCTL as "A" directors
            in accordance with the Articles of Association of HCL and NCTL,
            respectively, subject only to compliance by the Purchaser's nominees
            with their obligations in respect of such appointment under the
            Minority Agreements; and

      5.3.2 the Seller's obligations in respect of the passing of Board
            Resolutions of Chiltern Cable Limited shall be to procure the
            appointment of the 


                                       4
<PAGE>   5
            Purchaser's nominees as "A" directors in accordance with the
            Articles of Association of Chiltern Cable Limited.

6.    Article 6.8 of the Agreement shall be amended such that:-

      6.1   the total amount of cash and equivalents in hand or at a bank as
            shown in the Completion Balance Sheet shall be an increase to the
            cash element of the Purchase Price and the sum of pound sterling
            9,558,000 in respect of which amount shall be paid by the Purchaser
            to the Seller on the Telecential Completion Date, PROVIDED that in
            the event that the total amount of cash and equivalents in hand or
            at a bank as shown in the Completion Balance Sheet is not pound
            sterling9,558,000, the Purchaser shall pay any excess over pound
            sterling9,558,000 to the Seller or the Seller shall pay any
            shortfall under pound sterling9,558,000 to the Purchaser (as the
            case may be) not later than the fifth business day after agreement
            or determination of the Completion Balance Sheet in accordance with
            Article 6 of the Agreement; and

      6.2   there shall be deducted from the Purchase Price to be paid by the
            Purchaser on the Telecential Completion Date the cost (net of any
            associated credit note) of the acquisition of any relevant asset to
            the Purchaser or any subsidiary of the Purchaser in the event that
            the Purchaser or such subsidiary acquires such asset from a third
            party which is a lessor of such asset to a ComTel Company or member
            of the Telecential Group in connection with the prepayment or
            termination of any financial lease which constituted Indebtedness
            (which deduction it is agreed shall amount to pound
            sterling73,888.24 in total),

      the balance of the amount referred to in clause 6.1 above remaining after
      deduction of the amount referred to in clause 6.2 above being referred to
      in the Agreement as the "Cash Adjustment".

7.    In Schedule D to the Agreement, the definition of "Indebtedness" shall be
      varied so as to exclude any liabilities owed by any ComTel Company to any
      other ComTel Company and any liabilities owed by any member of the
      Telecential Group to any other member of the Telecential Group.

8.    Without prejudice to accrued rights under those Articles, the Seller and
      the Transferors covenant as at the date hereof to the Purchaser, CableTel
      Investments Limited, CableTel Limited and NTL Limited in the same terms,
      mutatis mutandis, as Articles 3.2 and 3.4 of the Agreement, the Purchaser
      covenants as at the date hereof to ComTel in the same terms, mutatis
      mutandis, as clause 4.7 of the Relationship Agreement dated 16 June 1998
      between ComTel, the Purchaser and the ComTel Companies (as defined in that
      agreement) and the Seller, the Transferors, the Purchaser, CableTel
      Investments Limited, CableTel Limited and NTL Limited covenant as at the
      date hereof with each other mutatis mutandis in accordance with Article 10
      of the Agreement.

9.    Vision Networks Holdings BV hereby confirms the terms of its guarantee
      dated 26 August 1998 in favour of NTL Group Limited notwithstanding the
      terms of this Supplemental Agreement and confirms that the benefit of such
      guarantee shall extend to CableTel Investments Limited, CableTel Limited
      and NTL Limited (in addition to the Purchaser) in respect of the
      obligations of the Seller and the 


                                       5
<PAGE>   6
      Transferors to any of them under the Agreement as amended by this
      Supplemental Agreement.

10.   Part 2 of Schedule Ind to the Agreement shall be deleted and Schedule 1
      annexed to this Supplemental Agreement shall be inserted in substitution
      therefor.

11.   The Purchaser and ComTel agree that paragraph 2 of Part 1 of Schedule 1 to
      the Relationship Agreement dated 16 June 1998 between ComTel, the
      Purchaser and the ComTel Companies (as defined in that agreement) shall be
      amended by the insertion of the following words at the end of that
      paragraph:-

      "Provided that so long as Telecential Completion takes place on 22nd
      September 1998,

      (a)   NTL's obligations to pay such fee shall be only to pay such fee to
            the extent that in the aggregate this exceeds pound sterling 3.5
            million (the "Excess Amount"). Any Excess Amount payable by NTL
            shall be paid simultaneously with payment of the Purchase Price (as
            defined in the Principal Agreement) on the Telecential Completion
            Date; and

      (b)   the Excess Amount shall be pound sterling 427,553.00"

12.   The Seller, ComTel and the Purchaser acknowledge that although not
      included in Schedule Z of the Agreement, ComTel Limited, a member of the
      Telecential Group, has two further subsidiary companies namely South
      Yorkshire Cablevision (UK) Limited and Chiltern Cable Limited (together
      the "Further Subsidiaries"). The existence of the Further Subsidiaries
      shall not be treated as a breach of the Warranties given by the Seller and
      the Transferors. The Seller and ComTel represent and warrant to the
      Purchaser :-

12.1  ComTel Limited is the legal and a member of the Telecential Group is the
      beneficial owner of the entire issued share capital of South Yorkshire
      Cablevision (UK) Limited which shares are validly issued and fully paid
      up;

12.2  ComTel Limited is the legal and a member of the Telecential Group is the
      beneficial owner of 160 A Ordinary Shares of pound sterling 1 each in the
      capital of Chiltern Cable Limited, which shares carry the right to
      exercise 80% of the votes which may be cast at general meetings of that
      company, subject to the rights of the holder of the C Special Rights
      Redeemable Shares in the capital of the company as set out in the Articles
      of Association of the Company, and are validly issued and fully paid up;

12.3  no person has any right to call for the transfer of any shares of South
      Yorkshire Cablevision (UK) Limited or any A Ordinary Shares of pound
      sterling 1 each in the capital of Chiltern Cable Limited in each case held
      by ComTel Limited or, so far as the Seller and ComTel are aware, no person
      has the right to call for the issue of any such shares except in each case
      as set out in the Articles of Association of such Further Subsidiary and
      none of the shares in these companies held by ComTel Limited are subject
      to any liens or charges of any kind or any encumbrances or interests in
      favour of any other person;


                                       6
<PAGE>   7
12.4  neither South Yorkshire Cablevision (UK) Limited nor Chiltern Cable
      Limited have any liabilities or have ever traded and both are dormant
      companies within the meaning of the Companies Acts 1985 (as amended).

      The Seller and ComTel hereby covenant to indemnify and keep indemnified
      South Yorkshire Cablevision (UK) Limited, Chiltern Cable Limited and the
      Purchaser (for itself and as trustee for South Yorkshire Cablevision (UK)
      Limited and Chiltern Cable Limited) against all liabilities, costs and
      expenses (including Tax and any liability to Tax) and all actions incurred
      by any of them as a result of or arising out of or in connection with any
      liabilities which South Yorkshire Cablevision (UK) Limited and Chiltern
      Cable Limited may have as at or incurred prior to Telecential Completion.
      The Seller and ComTel further hereby covenant to indemnify and keep
      indemnified the Purchaser for itself and as trustee for each member of the
      Telecential Group against all liabilities, costs and expenses incurred by
      any of them in respect of or arising out of or in connection with any
      obligation of them to provide funding (whether in the form of debt or
      equity subscription) to either of the Further Subsidiaries which
      obligation is in force (either as an actual or contingent obligation) as
      at the date of this Supplemental Agreement. The Seller and ComTel shall
      cease to have any liability under this clause 12 (save for any liability
      already accrued due thereunder or notified in writing prior thereto) on
      and following the tenth anniversary of the Telecential Completion Date.
      Neither the Seller nor ComTel shall be liable in respect of any losses or
      liabilities arising in connection with either or both of the Further
      Subsidiaries except to the extent of their obligations under clauses 5 and
      12 of this Supplemental Agreement. For the avoidance of doubt, the Seller
      and ComTel shall have no liability under this clause 12 in respect of any
      obligations of the Further Subsidiaries or any obligation of any of the
      parties listed in (10) through (13) above not accrued or existing, or in
      respect of any liabilities or losses suffered by any such parties in
      connection with any actions taken by either of the Further Subsidiaries
      except pursuant to obligations accrued or existing, (and in each case
      whether actual or contingent) at the date of this Agreement. None of the
      provisions of Articles 7, 9 and 11 of the Agreement shall apply to this
      clause or the Further Subsidiaries. References in the Agreement to members
      of the Telecential Group shall include South Yorkshire Cablevision (UK)
      Limited and Chiltern Cable Limited.

13.1  Subject as more particularly mentioned in clause 13.3 below, the cash
      element of the Purchase Price shall be increased by pound sterling250,000
      which sum shall be payable by the Purchaser to the Seller at Telecential
      Completion.

13.2  For the avoidance of doubt, payments in the ordinary course by any member
      of the Telecential Group in accordance with the terms of any Indebtedness
      (other than any prepayment or termination charges and associated costs)
      shall be for the account of the relevant member of the Telecential Group
      and shall not be treated as forming part of Indebtedness and their
      discharge shall not be treated as being for the account of the Seller or
      any Transferor.


13.3  The Parties acknowledge that the cash element of the Purchase Price
      payable by the Purchaser on the Telecential Completion Date in accordance
      with the terms of the Agreement (as amended hereby) shall be the "Total
      Receivable" amount set out in Schedule 2 annexed hereto.


                                       7
<PAGE>   8
13.4  The Seller hereby agrees that in the event that Telecential Completion
      occurs on 22 September 1998, the Seller shall not be entitled to any
      interest on the loan referred to in Article 3.3 of Agreement.

14.1  Article 12 (other than Articles 12.1 to 12.3 (inclusive), 12.13A, 12.14,
      12.15 (but without prejudice to the effect of clause 3 hereof), 12.16,
      12.19, 12.20 and 12.21) shall be incorporated in this Supplemental
      Agreement as if set out in full herein by reference to this Supplemental
      Agreement. For the purposes of Article 12.4 of the Agreement as so
      incorporated, the address and telefax details for notices or other
      communications to be given to Vision Networks Holdings BV shall be the
      same as those for the Seller and Transferors.

14.2  Except as expressly set out herein, capitalised terms defined in the
      Agreement shall have the same meaning in this Supplemental Agreement.

14.3  References in the Agreement to the "Agreement" shall be deemed to refer to
      the Agreement as varied by this Supplemental Agreement and references in
      the Agreement to the "Parties" shall include NTL Limited, CableTel
      Limited, CableTel Investments Limited and Vision Networks Holdings B.V..

15.   Except to the extent varied hereby, the parties confirm the terms of the
      Agreement.

AS WITNESS this Supplemental Agreement has been executed by the parties hereto
on the date first above written.


                                       8
<PAGE>   9
                                   SCHEDULE 1

                                  INDEBTEDNESS


                                       9
<PAGE>   10
                                   SCHEDULE 2

                                 PURCHASE PRICE


                                       10
<PAGE>   11
SIGNED on behalf of                  )
VISION NETWORKS III B.V.                     )
acting by                                    )       W.C.M. van der Hoeven
its director/duly authorised officer )





SIGNED on behalf of                  )
COMTEL UK FINANCE B.V.                       )
acting by                                    )       W.C.M. van der Hoeven
its director/duly authorised officer )





SIGNED on behalf of                  )
VISION NETWORKS (UK) I LIMITED       )
acting by                                    )       D.D. Adams
its director/duly authorised officer )





SIGNED on behalf of                  )
TELECENTIAL COMMUNICATIONS           )
(CANADA) LIMITED                     )
acting by                                    )       D.D. Adams
its director/duly authorised officer )





SIGNED on behalf of                  )
VISION NETWORKS (UK) II LIMITED      )
acting by                                    )       D.D. Adams
its director/duly authorised officer )





SIGNED on behalf of                  )
VISION NETWORKS HOLDINGS B.V.        )
acting by                                    )       W.C.M. van der Hoeven
its director/duly authorised officer )


                                       11
<PAGE>   12
SIGNED on behalf of                  )
TELECENTIAL COMMUNICATIONS           )
(UK) LIMITED                                 )
acting by                                    )       D.D. Adams
its director/duly authorised officer )





SIGNED on behalf of                  )
VISION NETWORKS UK HOLDING           )
B.V. (IN LIQUIDATION)                        )
acting by                                    )       W.C.M. van der Hoeven
its director/duly authorised officer )





SIGNED on behalf of                  )
NTL GROUP LIMITED                    )
acting by                                    )       R.M. Mackenzie
its director/duly authorised officer )





SIGNED on behalf of                  )
NTL INC.                             )
acting by                                    )       J. Gregg
its director/duly authorised officer )





SIGNED on behalf of                  )
CABLETEL INVESTMENTS LIMITED         )
acting by                                    )       R.M. Mackenzie
its director/duly authorised officer )


                                       12
<PAGE>   13
SIGNED on behalf of                  )
CABLETEL LIMITED                     )
acting by                                    )       R.M. Mackenzie
its director/duly authorised officer )





SIGNED on behalf of                  )
NTL LIMITED                                  )
acting by                                    )       R.M. Mackenzie
its director/duly authorised officer )


                                       13


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