MCI COMMUNICATIONS CORP
8-K, 1996-11-05
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549


                                    FORM 8-K

                               CURRENT REPORT

                      Pursuant to Section 13 or 15(d) of
                      the Securities Exchange Act of 1934

                      November 5, 1996 (November 3, 1996)

                Date of Report (Date of earliest event reported)


                       MCI COMMUNICATIONS CORPORATION
            ----------------------------------------------------
           (Exact name of registrant as specified in its charter)


        Delaware                0-6457         52-0886267
     --------------       ----------------     -------------
     (State or other         (Commission       (IRS Employer
     jurisdiction of           File Number)   Identification No.)
     incorporation)



           1801 Pennsylvania Avenue, N.W., Washington, D.C. 20006
           ------------------------------------------------------
                  (Address of Principal Executive Offices)

     Registrant's telephone number, including area code (202) 872-1600.



                                 Not Applicable
         -------------------------------------------------------------
         (Former name or former address, if changed since last report)















<PAGE>




                             PAGE 2

Item 5.  Other Events

         On  November  3,  1996,  MCI  Communications  Corporation,  a  Delaware
corporation (the  "Company"),  entered into an Agreement and Plan of Merger (the
"Agreement")  with  British  Telecommunications  plc, a public  limited  company
incorporated   under  the  laws  of  England  and  Wales  ("BT"),  and  Tadworth
Corporation,  a  Delaware  corporation  and  a  wholly-owned  subsidiary  of BT
("Tadworth"),  pursuant to which the Company  will merge with and into  Tadworth
(the  "Merger").  As a  result  of the  Merger,  each  outstanding  share of the
Company's  common stock, par value $.10 per share (other than shares held in the
treasury of the Company or owned by BT or Tadworth or any persons who shall have
properly  exercised  their  rights to appraisal  under  Delaware  law),  will be
converted into the right to receive (i) 0.54 American Depositary Shares ("ADSs")
of BT, each  representing ten ordinary shares of 25 pence each of BT (with cash 
being paid in lieu of fractional ADSs), and (ii) $6.00 in cash. The combined 
company will be named Concert plc and will operate under the BT and MCI brand 
names in the United Kingdom and the United States, respectively.

         Consummation of the Merger is subject to certain conditions,  including
receipt of the approval of the Merger and the transactions  contemplated thereby
by the  stockholders  of the Company  and BT and receipt of required  regulatory
approvals.

         The  foregoing  description  of  the  Agreement  and  the  transactions
contemplated  thereby  does not purport to be complete  and is  qualified in its
entirety by reference to the Agreement, a copy of which is attached as Exhibit 2
hereto. A copy of the press release, dated November 3, 1996, issued by the
Company,  relating  to the  above-described  transaction  is attached as
Exhibit 99 hereto.

Item 7.  Financial Statements and Exhibits

         (c)  The following exhibits are filed with this report:

         2.  Agreement  and Plan of Merger  dated as of November 3, 1996,  among
British  Telecommunications  plc, MCI  Communications  Corporation  and Tadworth
Corporation.

         99. Press Release of the Company, dated  November 3, 1996,
relating to the Merger and the transactions contemplated thereby.

<PAGE>


                           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.



                                   MCI COMMUNICATIONS CORPORATION

                                    /s/ David M. Case 
                                   ------------------------------
                                    David M. Case
                                    Vice President and Controller
                                    

Date: November 5, 1996















<PAGE>


                                                   EXHIBIT INDEX


Exhibit
No.               Description

2                 Agreement  and Plan of Merger,  dated as of  November 3, 1996,
                  among  British   Telecommunications  plc,  MCI  Communications
                  Corporation and Tadworth Corporation.

99                Press Release of the Company, dated November 3, 1996, relating
                  to the Merger and the transactions contemplated thereby.








                  AGREEMENT  AND PLAN OF MERGER,  dated as of  November  3, 1996
(this  "Agreement"),  among  BRITISH  TELECOMMUNICATIONS  plc, a public  limited
company   incorporated   under  the  laws  of  England  and  Wales  ("BT"),  MCI
COMMUNICATIONS   CORPORATION,  a  Delaware  corporation  ("MCI"),  and  TADWORTH
CORPORATION, a Delaware corporation and a wholly owned subsidiary of BT ("Merger
Sub").


                              W I T N E S S E T H :


                  WHEREAS,  the  respective  Boards of  Directors of BT, MCI and
Merger  Sub have each  determined  that the Merger is in the best  interests  of
their  respective  shareholders  and have approved the Merger upon the terms and
subject to the conditions set forth in this  Agreement,  whereby each issued and
outstanding share of common stock, par value $.10 per share, of MCI ("MCI Common
Stock"), other than shares owned directly or indirectly by BT or by MCI, will be
converted  into the  right to  receive  ordinary  shares  of BT  represented  by
American  Depositary  Shares of BT ("BT ADSs"),  each  representing ten ordinary
shares  of 25p each of BT ("BT  Ordinary  Shares")  and  evidenced  by  American
Depositary Receipts ("BT ADRs") and cash;

                  WHEREAS,  in order to effectuate the foregoing,  MCI, upon the
terms and subject to the conditions of this Agreement and in accordance with the
General  Corporation Law of the State of Delaware (the "DGCL"),  will merge with
and into Merger Sub (the "Merger");

                  WHEREAS,  BT,  MCI and  Merger  Sub  desire  to  make  certain
representations,  warranties,  covenants and  agreements in connection  with the
Merger and also to prescribe various conditions to the Merger; and

                  WHEREAS, for United States Federal income tax purposes,  it is
intended that the Merger shall qualify as a reorganization  under the provisions
of Section 368(a) of the Internal  Revenue Code of 1986, as amended (the "Code")
and that this Agreement  constitute a plan of reorganization  within the meaning
of Section 1.368-2(g) of the income tax regulations promulgated under the Code.

                  NOW,  THEREFORE,  in  consideration  of the  foregoing and the
respective  representations,  warranties,  covenants  and  agreements  set forth
herein,  and intending to be legally bound hereby,  the parties  hereto agree as
follows:




<PAGE>


                                                         2

                                    ARTICLE I

                                   THE MERGER


                  1.1. The Merger.  Upon the terms and subject to the conditions
set forth in this  Agreement,  and in  accordance  with the  DGCL,  MCI shall be
merged with and into Merger Sub at the Effective Time. Following the Merger, the
separate corporate existence of MCI shall cease and Merger Sub shall continue as
the surviving corporation (the "Surviving Corporation").

                  1.2.  Closing.  The closing of the Merger (the "Closing") will
take place on the fifth Business Day after  satisfaction  or waiver  (subject to
applicable law) of the conditions  (excluding  conditions  that, by their terms,
cannot be  satisfied  until the  Closing  Date)  set  forth in  Article  VI (the
"Closing  Date"),  unless  another  time or date is agreed to in  writing by the
parties hereto. The Closing shall be held at the offices of Shearman & Sterling,
599 Lexington Avenue,  New York, New York 10022,  unless another place is agreed
to in writing by the parties hereto.

                  1.3.  Effective  Time.  As soon as  practicable  following the
Closing,  the  parties  shall  (i) take all  steps to  obtain  admission  to the
official list of the London Stock Exchange (the "LSE") of the BT Ordinary Shares
to be issued in connection with the Merger and (if possible) simultaneously with
such  admission  file a  certificate  of merger (the  "Delaware  Certificate  of
Merger")  in such form as is required by and  executed  in  accordance  with the
relevant  provisions  of the DGCL and (ii) make all other  filings or recordings
required under the DGCL.  The Merger shall become  effective at such time as the
Delaware  Certificate  of Merger is duly filed with the  Delaware  Secretary  of
State or at such  other  time as BT and MCI  shall  agree in  writing  should be
specified  in the Delaware  Certificate  of Merger (the date and time the Merger
becomes effective being the "Effective Time").

                  1.4.  Effects of the Merger.  At and after the Effective Time,
the Merger  will have the effects set forth in the DGCL.  Without  limiting  the
generality of the foregoing,  and subject thereto, at the Effective Time all the
property, rights, privileges,  powers and franchises of MCI and Merger Sub shall
be vested in the Surviving Corporation, and all debts, liabilities and duties of
MCI and  Merger  Sub shall  become  the  debts,  liabilities  and  duties of the
Surviving Corporation.

                  1.5.   Certificate  of   Incorporation.   The  certificate  of
incorporation  of Merger Sub, as in effect  immediately  prior to the  Effective
Time,  shall be the certificate of  incorporation  of the Surviving  Corporation
(except that Article I of the Certificate of  Incorporation  shall be amended as
of the Effective  Time to read as follows:  "The name of the  Corporation is MCI
Communications  Corporation"),  until thereafter  changed or amended as provided
therein or by applicable law.



<PAGE>

                                                         3

     1.6. By-Laws.  The by-laws of Merger Sub as in effect at the Effective Time
shall be the by-laws of the Surviving  Corporation  until thereafter  changed or
amended as provided therein or by applicable law.

                  1.7. Officers of Surviving Corporation. The officers of MCI as
of the Effective Time shall be the officers of the Surviving Corporation,  until
the  earlier  of their  resignation  or removal  or  otherwise  ceasing to be an
officer or until their respective successors are duly elected and qualified,  as
the case may be, and BT and the Surviving  Corporation  shall use all reasonable
efforts to cause such officers to be elected as of the Effective Time.

                  1.8.  Effect on Capital  Stock.  As of the Effective  Time, by
virtue of the Merger and  without  any action on the part of the  holders of (i)
any shares of MCI Common  Stock,  (ii) any shares of Class A Common  Stock,  par
value $.10 per share, of MCI ("MCI Class A Common Stock") or (iii) any shares of
common stock, par value $.01 per share, of Merger Sub:

                  (a)  Cancellation of Treasury Stock and BT-Owned  Stock.  Each
         share of MCI Common  Stock that is owned by MCI as  treasury  stock and
         each  share of MCI  Common  Stock and each  share of MCI Class A Common
         Stock  that  are  owned  by BT or any  wholly  owned  Subsidiary  of BT
         (together, in each case, with the associated Right) shall automatically
         be cancelled and retired and shall cease to exist and no stock of BT or
         (subject to Section 1.8(c)) other  consideration  shall be delivered in
         exchange therefor.

                  (b) Conversion of MCI Common Stock. Subject to Section 2.5 and
         Section  2.14,  each issued and  outstanding  share of MCI Common Stock
         (other than shares to be cancelled in accordance  with Section  1.8(a))
         together with the associated Right shall be converted into the right to
         receive 0.54 BT ADSs (the "Stock Consideration") and $6.00 in cash (the
         "Cash  Consideration" and,  collectively with the Stock  Consideration,
         the "Merger Consideration").  As of the Effective Time, all such shares
         of MCI Common  Stock  (and the  associated  Rights)  shall no longer be
         outstanding and shall  automatically be cancelled and retired and shall
         cease to exist, and each holder of a certificate  representing any such
         shares of MCI Common Stock (and the  associated  Rights) shall cease to
         have any rights with respect thereto, except the right to receive, upon
         surrender  of such  certificate  in  accordance  with  Section 2.2, the
         Merger  Consideration  with  respect to the shares of MCI Common  Stock
         formerly  represented thereby to which such holder is entitled pursuant
         to this  Section  1.8 and a check in the  amount of any cash in lieu of
         fractional BT ADSs to which such holder is entitled pursuant to Section
         2.5(b), without interest.

(c) Allotment of BT Ordinary Shares. In consideration of and in exchange for the
issuance to BT by the Surviving  Corporation  of such number of shares of common
stock of the Surviving Corporation as BT shall specify, BT shall (i) allot and

<PAGE>


                                                         4

         issue the number of BT  Ordinary  Shares  represented  by BT ADSs to be
         issued in the Merger to the ADR  Depositary on behalf of the holders of
         MCI Common Stock entitled  thereto for the purposes of giving effect to
         the conversion  and exchange  referred to in this Article I, (ii) cause
         the  Surviving  Corporation  to pay cash in the amount  required  to be
         exchanged for shares of MCI Common Stock in the Merger pursuant to this
         Section 1.8 and any cash in lieu of  fractional BT ADSs and (iii) agree
         to the cancellation of the MCI Class A Common Stock. Holders of BT ADSs
         to be issued  in the  Merger  shall  not be  entitled  to  receive  the
         forecast  dividend,  whether paid as an interim or final  dividend,  of
         11.95p per BT Ordinary Share (the "Second  Dividend") to be recommended
         for payment in respect of its financial  year ending March 31, 1997 and
         BT shall in respect of the Second  Dividend  notify the LSE to mark the
         BT Ordinary Shares  "ex-dividend"  in the Stock Exchange Daily Official
         List on a date prior to the Effective Time. If the Effective Time shall
         be prior to March 31, 1998,  such holders  shall be entitled to receive
         the interim  dividend  payable by BT on the BT Ordinary  Shares for the
         year  ending  March 31, 1998  (normally  paid in February of each year)
         which  shall be payable on the later of (i) the  payment  date for such
         dividend  or  (ii)  at  the  Effective   Time  to  the  ADR  Depositary
         concurrently  with  payment of the  Merger  Consideration  pursuant  to
         Section 2.1. Holders of BT ADSs to be issued in the Merger shall not be
         entitled to receive the special  dividend or dividends  payable on each
         BT Ordinary Share referred to in Section 4.2(b)(i)(C).



                                   ARTICLE II

                            EXCHANGE OF CERTIFICATES


                  2.1.  Exchange Fund. At the Effective Time, (a) BT shall issue
to and deposit with BT's United States  depositary (the "ADR  Depositary"),  for
the benefit of the holders of shares of MCI Common Stock converted in accordance
with  Article I, BT Ordinary  Shares in an amount  sufficient  to permit the ADR
Depositary to issue BT ADRs representing the number of BT ADSs issuable pursuant
to Section 1.8 and (b) the Surviving Corporation shall deposit with such bank or
trust company as may be  designated  by BT and be  reasonably  acceptable to MCI
(the "Exchange Agent") cash in the amount required to be exchanged for shares of
MCI Common  Stock in the Merger  pursuant to Section 1.8 and any cash in lieu of
fractional  BT ADSs.  BT  shall  cause  the ADR  Depositary  to  issue  upon the
instructions of the Exchange Agent,  for the benefit of the holders of shares of
MCI Common Stock  converted in  accordance  with Article I, through the Exchange
Agent, BT ADRs  representing the number of BT ADSs issuable  pursuant to Section
1.8, as soon as  practicable  after the Effective  Time,  and the Exchange Agent
shall  deliver cash  contemplated  to be paid  pursuant to Section 1.8 and, from
time to time as required to make payments in lieu of fractional BT ADSs pursuant
to Section 2.5(b) (such cash and BT ADRs representing BT ADSs, together with any
dividends or distributions with respect thereto, being hereinafter


<PAGE>


                                                         5

referred to as the "Exchange Fund") in exchange for outstanding shares of MCI
Common Stock.

                  2.2. Exchange  Procedures.  As soon as reasonably  practicable
after the Effective Time, the Exchange Agent shall mail to each holder of record
of a certificate or certificates  which  immediately prior to the Effective Time
represented  outstanding  shares of MCI Common Stock (and the associated Rights)
(the  "Certificates")  that were  converted  into the right to  receive  BT ADSs
pursuant to Section  1.8(b),  (i) a letter of  transmittal  (which shall specify
that delivery shall be effected,  and risk of loss and title to the Certificates
shall pass, only upon delivery of the  Certificates  to the Exchange Agent,  and
which shall be in such form and have such other  provisions as BT may reasonably
specify)  and  (ii)  instructions  for use in  effecting  the  surrender  of the
Certificates  in exchange  for BT ADRs.  Upon  surrender  of a  Certificate  for
cancellation  to the Exchange  Agent  together with such letter of  transmittal,
duly executed and completed in accordance  with the  instructions  thereto,  and
such other  documents as may reasonably be required by the Exchange  Agent,  the
holder of such Certificate shall be entitled to receive in exchange therefor (A)
one or more BT ADRs representing,  in the aggregate, the whole number of BT ADSs
that such holder has the right to receive  pursuant to the provisions of Article
I (after  taking into  account all shares of MCI Common  Stock then held by such
holder) and (B) a check in the amount equal to the cash that such holder has the
right to receive  pursuant to the  provisions  of Article I and this Article II,
including  cash in lieu of any  fractional  BT ADSs pursuant to Section 2.5, and
the Certificate so surrendered  shall forthwith be cancelled.  In the event of a
transfer of ownership of MCI Common Stock that is not registered in the transfer
records of MCI, one or more BT ADRs  evidencing,  in the  aggregate,  the proper
number of BT ADSs may be  issued,  a check in the  proper  amount of cash may be
paid pursuant to Section 1.8 and cash in lieu of any  fractional BT ADSs and any
dividends or other  distributions  to which such holder is entitled  pursuant to
Section  2.3 may be paid to a Person  other  than the  Person in whose  name the
Certificate so surrendered is registered if the  Certificate  representing  such
MCI  Common  Stock  is  presented  to the  Exchange  Agent,  accompanied  by all
documents  required to evidence and effect such  transfer and evidence  that any
applicable   stock  transfer  taxes  have  been  paid.   Until   surrendered  as
contemplated  by this Article II, each  Certificate  shall be deemed at any time
after the Effective  Time to represent  only the right to receive upon surrender
the Merger Consideration with respect to the shares of MCI Common Stock formerly
represented thereby to which such holder is entitled pursuant to Section 1.8(b),
cash in lieu of any fractional BT ADSs to which such holder is entitled pursuant
to Section 2.5 and any dividends or other  distributions to which such holder is
entitled pursuant to Section 2.3. No interest will be paid or will accrue on any
cash payable in lieu of any  fractional BT ADSs payable  pursuant to Section 2.5
or any dividends or other distributions payable pursuant to Section 2.3.

                  2.3.  Distributions  with Respect to  Unexchanged  Shares.  No
dividends  or other  distributions  declared or made with respect to BT Ordinary
Shares with a record date after the  Effective  Time shall be paid to the holder
of any  unsurrendered  Certificate  with respect to the BT ADSs that such holder
would be entitled to receive upon surrender of such


<PAGE>


                                                         6

Certificate  and no cash payment in lieu of  fractional BT ADSs shall be paid to
any such holder  pursuant to Section 2.5 until such holder shall  surrender such
Certificate in accordance with Section 2.2.  Subject to the effect of applicable
laws,  following  surrender of any such Certificate,  there shall be paid to the
holder of BT ADSs issued in exchange  therefor,  without interest,  (a) promptly
after the time of such  surrender,  the  amount of any cash  payable  in lieu of
fractional BT ADSs to which such holder is entitled  pursuant to Section 2.5 and
the amount of  dividends  or other  distributions  with a record  date after the
Effective Time  theretofore  paid with respect to such whole BT ADSs, and (b) at
the  appropriate  payment date,  the amount of dividends or other  distributions
with a record date after the  Effective  Time but prior to such  surrender and a
payment date subsequent to such surrender payable with respect to such BT ADSs.

                  2.4. No Further  Ownership  Rights in MCI Common Stock. All BT
ADRs (and the BT ADSs  represented  by such BT ADRs)  issued  and cash paid upon
conversion of shares of MCI Common Stock in accordance with the terms of Article
I and this Article II (including  any cash paid pursuant to Sections 2.3 or 2.5)
shall be deemed to have been issued or paid in full  satisfaction  of all rights
pertaining  to the  shares  of MCI  Common  Stock  (and  the  Rights  associated
therewith).

                  2.5. No Fractional BT ADSs. (a) No certificates or scrip or BT
ADRs  representing  fractional  BT ADSs shall be issued upon the  surrender  for
exchange of Certificates  and such  fractional  share interests will not entitle
the owner  thereof  to vote or to have any  rights of a  shareholder  of BT or a
holder of BT ADRs or BT ADSs.

                  (b)  Notwithstanding  any other  provision of this  Agreement,
each holder of shares of MCI Common Stock  exchanged  pursuant to the Merger who
would  otherwise  have been  entitled  to receive a fraction  of a BT ADS (after
taking into account all Certificates delivered by such holder) shall receive, in
lieu thereof,  cash (without  interest) in an amount equal to the product of (i)
such  fractional part of a BT ADS multiplied by (ii) the last sales price per BT
ADS on the New York Stock Exchange, Inc. (the "NYSE") Composite Transaction Tape
for the Closing Date. As promptly as practicable  after the determination of the
amount of cash,  if any,  to be paid to holders  of  fractional  interests,  the
Exchange Agent shall so notify BT, and BT shall cause the Surviving  Corporation
to deposit  such amount  with the  Exchange  Agent and shall cause the  Exchange
Agent to forward payments to such holders of fractional interests subject to and
in accordance with the terms hereof.

                  2.6. Termination of Exchange Fund. Any portion of the Exchange
Fund which  remains  undistributed  to the  holders of  Certificates  for twelve
months after the Effective Time shall be delivered to the Surviving  Corporation
or otherwise on the instruction of the Surviving Corporation, and any holders of
the  Certificates  who have not theretofore  complied with this Article II shall
thereafter  look  only  to  the  Surviving  Corporation  or BT  for  the  Merger
Consideration   with  respect  to  the  shares  of  MCI  Common  Stock  formerly
represented  thereby to which such holders are entitled pursuant to Section 2.2,
any cash in lieu of fractional BT ADSs to which such holders are entitled


<PAGE>


                                                         7

pursuant to Section 2.5 and any  dividends or  distributions  with respect to BT
ADSs to which such holders are entitled pursuant to Section 2.3. Any such former
portion of the  Exchange  Fund  remaining  unclaimed by holders of shares of MCI
Common  Stock  five  years  after  the  Effective  Time  (or such  earlier  date
immediately  prior to such time as such amounts  would  otherwise  escheat to or
become property of any  Governmental  Entity) shall, to the extent  permitted by
applicable law, become the property of the Surviving  Corporation free and clear
of any claims or interest of any Person previously entitled thereto.

                  2.7.  No  Liability.  None of BT,  Merger  Sub,  MCI,  the ADR
Depositary,  the Surviving  Corporation or the Exchange Agent shall be liable to
any Person in respect of any BT ADRs (or dividends or distributions with respect
to BT ADSs) or cash  from  the  Exchange  Fund  delivered  to a public  official
pursuant to any applicable abandoned property, escheat or similar law.

2.8.  Investment  of Exchange  Fund.  The  Exchange  Agent shall invest any cash
included in the  Exchange  Fund as directed by the  Surviving  Corporation  on a
daily basis. Any interest and other income resulting from such investments shall
promptly be paid to the Surviving Corporation.

                  2.9. Lost  Certificates.  If any  Certificate  shall have been
lost,  stolen or destroyed,  upon the making of an affidavit of that fact by the
Person  claiming  such  Certificate  to be lost,  stolen or  destroyed  and,  if
required by BT, the posting by such Person of a bond in such  reasonable  amount
as BT may direct as indemnity against any claim that may be made against it with
respect to such  Certificate,  the  Exchange  Agent will deliver in exchange for
such lost, stolen or destroyed  Certificate the applicable Merger  Consideration
with respect to the shares of MCI Common Stock formerly represented thereby, any
cash in lieu of fractional BT ADSs, and unpaid dividends and distributions on BT
ADSs deliverable in respect thereof, pursuant to this Agreement.

                  2.10.  Withholding Rights.  Each of the Surviving  Corporation
and BT shall be entitled to deduct and withhold from the consideration otherwise
payable  pursuant to this  Agreement to any holder of shares of MCI Common Stock
such amounts as it is required to deduct and withhold with respect to the making
of such payment under the Code, or any provision of state,  local or foreign tax
law,  including the tax laws of the United  Kingdom.  To the extent that amounts
are so withheld  by the  Surviving  Corporation  or BT, as the case may be, such
withheld  amounts shall be treated for all purposes of this  Agreement as having
been paid to the holder of the  shares of MCI  Common  Stock in respect of which
such deduction and withholding  was made by the Surviving  Corporation or BT, as
the case may be.

     2.11. Further Assurances. At and after the Effective Time, the officers and
directors  of the  Surviving  Corporation  will be  authorized  to  execute  and
deliver,  in the name and on behalf of MCI or Merger  Sub,  any deeds,  bills of
sale, assignments or assurances and to take and do, in the name and on behalf of
MCI or Merger Sub, any other actions and

<PAGE>


                                                         8

things to vest,  perfect  or  confirm of record or  otherwise  in the  Surviving
Corporation  any and all right,  title and  interest in, to and under any of the
rights,  properties  or  assets  acquired  or to be  acquired  by the  Surviving
Corporation as a result of, or in connection with, the Merger.

                  2.12. Stock Transfer Books. At the close of business, New York
City time, on the day the Effective Time occurs, the stock transfer books of MCI
shall be closed  and there  shall be no further  registration  of  transfers  of
shares of MCI Common Stock  thereafter on the records of MCI. From and after the
Effective Time, the holders of Certificates  shall cease to have any rights with
respect to such shares of MCI Common Stock formerly represented thereby,  except
as otherwise  provided  herein or by law. On or after the  Effective  Time,  any
Certificates  presented  to the  Exchange  Agent or BT for any  reason  shall be
converted into the Merger Consideration with respect to the shares of MCI Common
Stock formerly  represented  thereby,  any cash in lieu of fractional BT ADSs to
which the holders thereof are entitled pursuant to Section 2.5 and any dividends
or other  distributions  to which the holders  thereof are entitled  pursuant to
Section 2.3.

                  2.13. Restricted BT ADRs.  Notwithstanding  anything contained
in Article I or this Article II,  stockholders of MCI who are affiliates  ("Rule
145  Affiliates") of MCI as of the Effective Time within the meaning of Rule 145
under the  Securities  Act of 1933,  as amended  (the  "Securities  Act"),  will
receive  restricted BT ADRs ("Restricted BT ADRs") pursuant to this Section 2.13
and all  references  to BT ADRs to be received  pursuant to Articles I and II by
Rule 145 Affiliates shall be deemed to be references to Restricted BT ADRs.

                  2.14.  Shares  of  Dissenting  Stockholders.   Notwithstanding
anything in this Agreement to the contrary,  any shares of MCI Common Stock that
are  outstanding  immediately  prior to the Effective  Time and that are held by
stockholders  who  shall  not have  voted in favor of the  Merger  or  consented
thereto in writing and who shall have demanded properly in writing appraisal for
such  shares in  accordance  with  Section  262 of the DGCL  (collectively,  the
"Dissenting  Shares")  shall not be  converted  into or  represent  the right to
receive the Merger Consideration. Such stockholders shall be entitled to receive
payment of the  appraised  value of such shares of MCI Common Stock held by them
in accordance  with the  provisions of Section 262 of the DGCL,  except that all
Dissenting  Shares held by stockholders  who shall have failed to perfect or who
effectively  shall have  withdrawn  or lost their  rights to  appraisal  of such
shares of MCI Common Stock under such  Section 262 shall  thereupon be deemed to
have been  converted into and to have become  exchangeable,  as of the Effective
Time,  for the right to  receive,  without  any  interest  thereon,  the  Merger
Consideration.  MCI shall give BT (i) prompt notice of any notice or demands for
appraisal or payment for shares of MCI Common Stock received by MCI and (ii) the
opportunity to participate in and direct all  negotiations  and proceedings with
respect to any such demands or notices. MCI shall not, without the prior written
consent of BT, make any payment with  respect to, or settle,  offer to settle or
otherwise negotiate, any such demands.



<PAGE>


                                                         9



                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES


                  3.1.  Representations  and  Warranties  of MCI.  Except as set
forth in the MCI Disclosure  Schedule  delivered by MCI to BT at or prior to the
execution of this Agreement  (the "MCI  Disclosure  Schedule")  (each section of
which  qualifies the  correspondingly  numbered  representation  and warranty or
covenant to the extent specified therein),  MCI represents and warrants to BT as
follows:

                  (a) Organization,  Standing and Power. Each of MCI and each of
         its Subsidiaries is a corporation duly organized,  validly existing and
         in good standing under the laws of its jurisdiction of incorporation or
         organization,  has all requisite  power and authority to own, lease and
         operate  its  properties  and to carry  on its  business  as now  being
         conducted and is duly  qualified and in good standing to do business in
         each  jurisdiction in which the nature of its business or the ownership
         or leasing of its properties makes such  qualification  necessary other
         than in such  jurisdictions  where the failure so to qualify would not,
         either individually or in the aggregate, have a Material Adverse Effect
         on MCI. The copies of the certificate of  incorporation  and by-laws of
         MCI  which  were  previously  furnished  to BT are true,  complete  and
         correct  copies  of such  documents  as in  effect  on the date of this
         Agreement.

                  (b)      Capital Structure.

                           (i) As of September 30, 1996, the authorized  capital
                  stock  of MCI  consists  of (A)  2,000,000,000  shares  of MCI
                  Common Stock, of which 548,903,285 shares are outstanding, (B)
                  500,000,000  shares  of MCI  Class A  Common  Stock,  of which
                  135,998,932  shares are outstanding and (C) 50,000,000  shares
                  of designated  preferred stock, of which 10,000,000  shares of
                  Series  E  Junior  Participating  Preferred  Stock  have  been
                  designated  and  reserved for  issuance  upon  exercise of the
                  rights (the "Rights") distributed to the holders of MCI Common
                  Stock pursuant to the Rights  Agreement  dated as of September
                  30, 1994  between MCI and Mellon Bank,  N.A.,  as rights agent
                  (the "Rights Agreement"). Since September 30, 1996 to the date
                  of this  Agreement,  there have been no issuances of shares of
                  the capital stock of MCI or any other  securities of MCI other
                  than  issuances  of  shares  pursuant  to  options  or  rights
                  outstanding  as of  September  30,  1996 under the MCI Benefit
                  Plans. All issued and outstanding  shares of the capital stock
                  of MCI are duly  authorized,  validly  issued,  fully paid and
                  nonassessable,  and no class of capital  stock (other than MCI
                  Class A Common Stock) is entitled to preemptive rights.  There
                  were outstanding as of September 30, 1996 no options, warrants


<PAGE>


                                                        10

                  or other rights to acquire  capital  stock from MCI other than
                  (x)  options  representing  in  the  aggregate  the  right  to
                  purchase  78,036,440 shares of MCI Common Stock under the 1989
                  MCI Stock Option Plan,  the MCI 1988  Directors'  Stock Option
                  Plan and the MCI 1979 Stock  Option  Plan  (collectively,  the
                  "MCI  Stock  Option  Plans")  and (y)  rights to  purchase  an
                  aggregate of  19,068,621  shares of MCI Common Stock under the
                  ESPP.  No  options  or  warrants  or other  rights to  acquire
                  capital  stock  from MCI have  been  issued or  granted  since
                  September 30, 1996 to the date of this Agreement.

                           (ii)  As of the  date of this  Agreement,  no  bonds,
                  debentures,  notes or other  indebtedness  of MCI  having  the
                  right to vote on any  matters on which  stockholders  may vote
                  ("MCI Voting Debt") are issued or outstanding.

                           (iii) Except as  otherwise  set forth in this Section
                  3.1(b),  as of  the  date  of  this  Agreement,  there  are no
                  securities,  options,  warrants,  calls, rights,  commitments,
                  agreements,  arrangements or undertakings of any kind to which
                  MCI or any of its  Subsidiaries  is a party or by which any of
                  them is bound  obligating  MCI or any of its  Subsidiaries  to
                  issue,  deliver or sell,  or cause to be issued,  delivered or
                  sold,  additional  shares  of  capital  stock or other  voting
                  securities of MCI or any of its Subsidiaries or obligating MCI
                  or any of its  Subsidiaries to issue,  grant,  extend or enter
                  into  any  such  security,   option,   warrant,  call,  right,
                  commitment,  agreement,  arrangement or undertaking. As of the
                  date of this Agreement,  there are no outstanding  obligations
                  of MCI or any of its  Subsidiaries  to  repurchase,  redeem or
                  otherwise acquire any shares of capital stock of MCI or any of
                  its Subsidiaries.

                  (c)      Authority; No Conflicts.

                           (i)  MCI  has  all  requisite   corporate  power  and
                  authority  to enter into this  Agreement  and,  subject to the
                  adoption  of  this  Agreement  by the  requisite  vote  of the
                  holders  of MCI  Common  Stock and the  requisite  vote of the
                  holders of MCI Class A Common  Stock,  voting  separately as a
                  class, to consummate the transactions contemplated hereby. The
                  execution and delivery of this Agreement and the  consummation
                  of  the  transactions   contemplated  hereby  have  been  duly
                  authorized  by all necessary  corporate  action on the part of
                  MCI,  subject in the case of the consummation of the Merger to
                  the  adoption of this  Agreement by the  stockholders  of MCI.
                  This Agreement has been duly executed and delivered by MCI and
                  constitutes a valid and binding agreement of MCI,  enforceable
                  against  it in  accordance  with  its  terms,  except  as such
                  enforceability  may  be  limited  by  bankruptcy,  insolvency,
                  reorganization,  moratorium  and similar  laws  relating to or
                  affecting  creditors  generally,  by general equity principles
                  (regardless of whether such enforceability is


<PAGE>


                                                        11

                  considered  in a  proceeding  in  equity  or at  law) or by an
                  implied covenant of good faith and fair dealing.

                           (ii) The  execution  and  delivery of this  Agreement
                  does not or will not, as the case may be, and the consummation
                  of the  transactions  contemplated  hereby will not,  conflict
                  with,  or result in any  violation of, or constitute a default
                  (with or without  notice or lapse of time, or both) under,  or
                  give rise to a right of termination,  amendment,  cancellation
                  or  acceleration  of any  obligation or the loss of a material
                  benefit  under,  or the creation of a lien,  pledge,  security
                  interest,  charge or other encumbrance on any assets (any such
                  conflict, violation, default, right of termination, amendment,
                  cancellation or acceleration, loss or creation, a "Violation")
                  pursuant  to:  (A)  any  provision  of  the   certificate   of
                  incorporation  or by-laws of MCI or any  Subsidiary  of MCI or
                  (B) except as would not have a Material  Adverse Effect on MCI
                  and,  subject to obtaining or making the consents,  approvals,
                  orders,   authorizations,   registrations,   declarations  and
                  filings  referred to in  paragraph  (iii)  below,  any loan or
                  credit agreement,  note,  mortgage,  bond,  indenture,  lease,
                  benefit  plan  or  other  agreement,  obligation,  instrument,
                  permit,  concession,   franchise,  license,  judgment,  order,
                  decree, statute, law, ordinance, rule or regulation applicable
                  to MCI or any Subsidiary of MCI or their respective properties
                  or assets.

                           (iii) No consent,  approval,  order or  authorization
                  of,  or   registration,   declaration   or  filing  with,  any
                  supra-national,    national,   state,   municipal   or   local
                  government,   any   instrumentality,    subdivision,    court,
                  administrative   agency  or  commission  or  other   authority
                  thereof, or any  quasi-governmental or private body exercising
                  any  regulatory,  taxing,  importing or other  governmental or
                  quasi-governmental authority,  including the European Union (a
                  "Governmental  Entity"), is required by or with respect to MCI
                  or any Subsidiary of MCI in connection  with the execution and
                  delivery of this Agreement by MCI or the  consummation  by MCI
                  of the  transactions  contemplated  hereby,  except  for those
                  required  under or in  relation  to (A) the  Hart-Scott-Rodino
                  Antitrust Improvements Act of 1976, as amended (the "HSR Act")
                  and  Council   Regulation   (EEC)  No.  4064/89   ("Regulation
                  4064/89"), (B) the Communications Act of 1934, as amended (the
                  "Communications   Act"),   and  any  rules   and   regulations
                  promulgated by the Federal Communications  Commission ("FCC"),
                  (C) state  securities or "blue sky" laws,  (D) the  Securities
                  Act, (E) the Securities  Exchange Act of 1934, as amended (the
                  "Exchange  Act"),  (F) the DGCL with respect to the filing and
                  recordation  of  appropriate  merger or other  documents,  (G)
                  rules and  regulations  of any state or foreign public service
                  commissions or similar state or foreign regulatory bodies, (H)
                  Section 721 of the Defense Production Act of 1950, as amended,
                  and the rules promulgated  thereunder  ("Exon-Florio") and the
                  rules  and  regulations   promulgated  by  the  Department  of
                  Defense, (I) rules and


<PAGE>


                                                        12

                  regulations of the Nasdaq National Market ("NASDAQ"),  (J) the
                  Fair Trading Act of 1973, (K) the Restrictive  Trade Practices
                  Act 1976,  (L)  antitrust or other  competition  laws of other
                  jurisdictions,  and  (M)  such  consents,  approvals,  orders,
                  authorizations,  registrations,  declarations  and filings the
                  failure  of which to make or obtain  would not have a Material
                  Adverse   Effect   on  MCI.   Consents,   approvals,   orders,
                  authorizations,   registrations,   declarations   and  filings
                  required under or in relation to any of the foregoing  clauses
                  (A)  through  (L) are  hereinafter  referred  to as  "Required
                  Consents."

                  (d)      Reports and Financial Statements.

                           (i) MCI has filed all  required  reports,  schedules,
                  forms,  statements and other documents required to be filed by
                  it with the SEC since January 1, 1995 (collectively, including
                  all exhibits thereto, the "MCI SEC Reports"). No Subsidiary of
                  MCI is  required  to file any form,  report or other  document
                  with  the  SEC.  None  of the  MCI SEC  Reports,  as of  their
                  respective  dates (and,  if amended or  superseded by a filing
                  prior to the date of this  Agreement  or of the Closing  Date,
                  then on the date of such  filing),  contained  or will contain
                  any untrue  statement  of a  material  fact or omitted or will
                  omit to state a material fact required to be stated therein or
                  necessary  to make  the  statements  therein,  in light of the
                  circumstances under which they were made, not misleading. Each
                  of the  financial  statements  (including  the related  notes)
                  included  in the  MCI  SEC  Reports  presents  fairly,  in all
                  material  respects,  the consolidated  financial  position and
                  consolidated  results of operations  and cash flows of MCI and
                  its  Subsidiaries  as of  the  respective  dates  or  for  the
                  respective  periods set forth therein,  all in conformity with
                  United States generally accepted accounting  principles ("U.S.
                  GAAP") consistently applied during the periods involved except
                  as otherwise  noted therein,  and subject,  in the case of the
                  unaudited   interim  financial   statements,   to  normal  and
                  recurring year-end  adjustments that have not been and are not
                  expected  to be  material  in  amount.  All of  such  MCI  SEC
                  Reports,  as of their  respective dates (and as of the date of
                  any amendment to the respective  MCI SEC Report),  complied as
                  to  form  in  all  material   respects  with  the   applicable
                  requirements  of the  Securities  Act and the Exchange Act and
                  the rules and regulations promulgated thereunder.

                           (ii) Except as set forth in the MCI SEC Reports filed
                  prior  to  the  date  of  this   Agreement,   and  except  for
                  liabilities and obligations incurred in the ordinary course of
                  business  consistent  with past  practice  since  December 31,
                  1995,  neither  MCI  nor  any  of  its  Subsidiaries  has  any
                  liabilities  or obligations  of any nature  (whether  accrued,
                  absolute,  contingent or otherwise) which,  individually or in
                  the aggregate,  would have a Material Adverse Effect on MCI or
                  would  prevent or  materially  delay the  performance  of this
                  Agreement by MCI.


<PAGE>


                                                        13


                  (e)      Information Supplied.

                           (i)  None  of  the  information  supplied  or  to  be
                  supplied by MCI for inclusion or incorporation by reference in
                  (A) the  registration  statement  on Form F-4 to be filed with
                  the SEC by BT in  connection  with the  issuance of BT ADSs in
                  the Merger (the "Form F-4") will,  at the time the Form F-4 is
                  filed with the SEC, at any time it is amended or  supplemented
                  or at the time it becomes  effective under the Securities Act,
                  contain  any untrue  statement  of a material  fact or omit to
                  state any  material  fact  required  to be stated  therein  or
                  necessary to make the  statements  therein not  misleading and
                  (B) the proxy  statement/prospectus  included  in the Form F-4
                  related  to  the  MCI   Stockholders   Meeting)   (the  "Proxy
                  Statement/Prospectus")  and, if applicable, the Schedule 13E-3
                  will, on the date it is first mailed to MCI stockholders or at
                  the time of the MCI Stockholders  Meeting,  contain any untrue
                  statement  of a  material  fact or omit to state any  material
                  fact  required to be stated  therein or  necessary in order to
                  make the  statements  therein,  in light of the  circumstances
                  under  which  they  were  made,  not  misleading.   The  Proxy
                  Statement/Prospectus  will  comply as to form in all  material
                  respects  with the  requirements  of the  Exchange Act and the
                  Securities  Act  and  the  rules  and  regulations  of the SEC
                  thereunder.

                           (ii) The  information  supplied  or to be supplied by
                  MCI for  inclusion in the Super Class 1  Shareholder  Circular
                  (comprising listing particulars under Part IV of the Financial
                  Services  Act 1986 of the  United  Kingdom,  as  amended  (the
                  "FSA")) (the "BT Disclosure  Document")  will, on the date the
                  BT Disclosure  Document is first mailed to  shareholders of BT
                  and at the time of the BT  Shareholder  Meeting,  include  all
                  such information within the knowledge of each of the directors
                  of MCI (or which it would be reasonable  for them to obtain by
                  making enquiries) as investors and their professional advisers
                  reasonably  require  and  expect to find,  for the  purpose of
                  making an informed  assessment of the assets and  liabilities,
                  financial position, profits and losses and prospects of BT and
                  of the  rights  attaching  to the  securities  to which the BT
                  Disclosure Document relates.

                           (iii)  Notwithstanding  the  foregoing  provisions of
                  this Section 3.1(e),  no representation or warranty is made by
                  MCI  with  respect  to  statements  made  or  incorporated  by
                  reference  in the F-4,  the  Proxy  Statement/Prospectus,  the
                  Schedule 13E-3 (if  applicable) or the BT Disclosure  Document
                  based  on   information   supplied  by  BT  for  inclusion  or
                  incorporation by reference therein.

     (f)  Compliance  with  Applicable  Laws;  Regulatory  Matters.  MCI and its
Subsidiaries   hold   all   permits,   licenses,    certificates,    franchises,
registrations,  variances,  exemptions, orders and approvals of all Governmental
Entities  which are material to the  operation of the  businesses of MCI and its
Subsidiaries, taken as a whole (the

<PAGE>


                                                        14

         "MCI  Permits").  MCI and its  Subsidiaries  are in compliance with the
         terms of the MCI  Permits,  except  where  the  failure  so to  comply,
         individually  or in the  aggregate,  would not have a Material  Adverse
         Effect on MCI.  Except as disclosed in the MCI SEC Reports  filed prior
         to  the  date  of  this  Agreement,  the  businesses  of  MCI  and  its
         Subsidiaries  are not being and have not been conducted in violation of
         any law, ordinance,  regulation,  judgment, decree, injunction, rule or
         order  of  any  Governmental  Entity,   except  for  violations  which,
         individually  or in the  aggregate,  would not have a Material  Adverse
         Effect  on MCI.  As of the  date of this  Agreement,  no  investigation
         (other  than with  respect to Taxes) by any  Governmental  Entity  with
         respect to MCI or any of its  Subsidiaries  is pending  or, to the best
         knowledge  of  MCI,  threatened,   other  than  investigations   which,
         individually  or in the  aggregate,  would not have a Material  Adverse
         Effect  on  MCI.   Since  December  31,  1994,  MCI  and  each  of  its
         Subsidiaries  required  to  make  filings  under  all  applicable  laws
         regulating   the   telephone,   mobile   cellular,   paging   or  other
         telecommunications  business has filed with all applicable Governmental
         Entities (including the applicable public utilities  commissions or the
         FCC, as the case may be) all material  forms,  statements,  reports and
         documents  (including  exhibits,  annexes and any  amendments  thereto)
         required to be filed by them,  and each such filing  complied  with all
         applicable laws, rules and regulations,  except for such  noncompliance
         which  would not,  individually  or in the  aggregate,  have a Material
         Adverse Effect on MCI or prevent or materially delay the performance of
         this Agreement by MCI.

                  (g)  Litigation.  Except as  disclosed  in the MCI SEC Reports
         filed  prior to the  date of this  Agreement,  there is no  litigation,
         arbitration,  claim, suit, action,  investigation or proceeding pending
         or, to the  knowledge of MCI,  threatened,  against or affecting MCI or
         any Subsidiary of MCI which,  individually or in the aggregate, has had
         or would  have a  Material  Adverse  Effect  on MCI,  nor is there  any
         judgment, award, decree, injunction,  rule or order of any Governmental
         Entity or arbitrator  outstanding  against MCI or any Subsidiary of MCI
         which,  individually  or in the  aggregate,  has  had or  would  have a
         Material Adverse Effect on MCI.

                  (h) Taxes. (i) MCI and each of its Subsidiaries  have prepared
         in good  faith and duly and  timely  filed  (taking  into  account  any
         extension  of time  within  which to file)  all  material  Tax  Returns
         required  to be filed by any of them and all such filed Tax Returns are
         complete and accurate in all  material  respects;  (ii) MCI and each of
         its  Subsidiaries  have  paid all  Taxes  that are shown as due on such
         filed Tax Returns or that MCI or any of its  Subsidiaries  is obligated
         to  withhold  from  amounts  owing to any  employee,  creditor or third
         party,  except with  respect to matters  contested in good faith or for
         such amounts that,  individually or in the aggregate,  would not have a
         Material Adverse Effect on MCI; (iii) as of the date of this Agreement,
         there are no pending or, to the best  knowledge of MCI,  threatened  in
         writing  material  audits,   examinations,   investigations   or  other
         proceedings  in respect of Taxes or Tax matters  relating to MCI or any
         of its Subsidiaries;  (iv) there are not, to the best knowledge of MCI,
         any unresolved questions or claims concerning its or any


<PAGE>


                                                        15

         of  its  Subsidiaries'  Tax  liability  that,  individually  or in  the
         aggregate, would have a Material Adverse Effect on MCI and there are no
         deficiencies or claims for any Taxes that have been proposed,  asserted
         or  assessed  against  MCI or any of its  Subsidiaries  which,  if such
         deficiencies or claims were finally  resolved against MCI or any of its
         Subsidiaries would,  individually or in the aggregate,  have a Material
         Adverse Effect on MCI; (v) neither MCI nor any of its  Subsidiaries has
         any liability with respect to Taxes in excess of the amounts accrued in
         respect thereof that are reflected in the financial statements included
         in the MCI SEC Reports,  except such excess  liabilities  as would not,
         individually  or in the  aggregate,  have a Material  Adverse Effect on
         MCI; (vi) there are no material  Liens for Taxes upon the assets of MCI
         or any of its Subsidiaries,  other than Liens for current Taxes not yet
         due and  payable and Liens for Taxes that are being  contested  in good
         faith by  appropriate  proceedings;  (vii)  neither  MCI nor any of its
         Subsidiaries  has agreed to or is required to make any adjustment under
         Section  481(a)  of the Code;  and  (viii)  neither  MCI nor any of its
         Subsidiaries has made an election under Section 341(f) of the Code.

                  (i)  Subsidiaries  and Equity  Interests.  Exhibit 21 to MCI's
         Annual Report on Form 10-K for the fiscal year ended  December 31, 1995
         includes all the  Subsidiaries  of MCI as of the date of this Agreement
         required to be included on such exhibit by the rules and regulations of
         the SEC, were it to be filed as of the date of this  Agreement.  Unless
         otherwise   described  therein,   MCI  owns,  directly  or  indirectly,
         beneficially  and of record 100% of the issued and  outstanding  voting
         securities of each such Subsidiary  (other than  directors'  qualifying
         shares,  if any).  Section 3.1(i) of the MCI Disclosure  Schedule lists
         each  corporation,  partnership,  limited  liability company or similar
         entity with respect to which, as of the date of this Agreement,  MCI or
         any Subsidiary of MCI owns more than 5% but less than a majority of the
         voting equity or similar  voting  interest or any interest  convertible
         into, or exchangeable or exercisable  for, more than 5% but less than a
         majority  of the voting  equity or similar  voting  interest  and which
         interest is carried on MCI's most recent  financial  statements  (or if
         not held as of the date  thereof,  would be carried on MCI's  financial
         statements  if prepared as of the date  hereof) at a value in excess of
         $10,000,000  (collectively,  the "MCI Equity Interests").  There are no
         plans to  restructure  in any  material  respect  any of the MCI Equity
         Interests.  All  of  the  shares  of  capital  stock  of  each  of  the
         Subsidiaries  and all the MCI  Equity  Interests  held by MCI and  each
         Subsidiary of MCI are fully paid and nonassessable and are owned by MCI
         or such  Subsidiary  free and clear of any security  interest,  pledge,
         option,   right  of  first   refusal,   limitation  on  MCI's  or  such
         Subsidiary's voting rights, charge, claim, lien or other encumbrance of
         any nature whatsoever  (collectively,  "Liens").  There are no material
         outstanding  contractual  obligations of MCI or any of its Subsidiaries
         to  provide  funds to, or make any  investment  (in the form of a loan,
         capital  contribution  or  otherwise)  in, any  Subsidiary  of MCI, any
         entity  in  which  MCI or any  Subsidiary  of MCI  owns  an MCI  Equity
         Interest,  or any other Person,  except such  obligations  as would not
         require any investment or provision of funds or assets in an


<PAGE>


                                                        16

         amount or having a fair market value in excess of  $10,000,000  for any
         such   investment  or   $50,000,000  in  the  aggregate  for  all  such
         investments.

                  (j)      Absence of Certain Changes or Events.

                           (i) Except as disclosed in the MCI SEC Reports  filed
                  prior to the date of this  Agreement:  (A) since  December 31,
                  1995, MCI and its Subsidiaries have conducted their respective
                  businesses in the ordinary  course  consistent with their past
                  practices and have not incurred any material liability, except
                  in  the  ordinary  course  of  their   respective   businesses
                  consistent with their past  practices;  (B) since December 31,
                  1995 to the  date of this  Agreement,  there  has not been any
                  change in or effect on, or any event or circumstance involving
                  a prospective change in or effect on, the business,  financial
                  condition  or  results  of  operations  of  MCI  or any of its
                  Subsidiaries,  that has had, or would have, a Material Adverse
                  Effect on MCI; and (C) since December 31, 1995,  there has not
                  been any change in or effect on, or any event or  circumstance
                  involving a prospective  change in or effect on, the business,
                  financial  condition or results of operations of MCI or any of
                  its  Subsidiaries  that has had,  or is  reasonably  likely to
                  have, a material  adverse effect on the business,  operations,
                  assets, liabilities (including, without limitation, contingent
                  liabilities),  financial condition or results of operations of
                  MCI and its  Subsidiaries,  taken as a whole,  other than as a
                  result  of (1)  changes  after the date of this  Agreement  in
                  general economic conditions or the securities markets, and (2)
                  legal or regulatory  changes  effective after the date of this
                  Agreement affecting the telecommunications industry generally.

                           (ii) As of the  date of this  Agreement,  no plans or
                  proposals  are  under  consideration  by  MCI to  announce  or
                  implement any restructuring or other similar actions by MCI or
                  any of its  Subsidiaries  which would be reasonably  likely to
                  result in material  charges or write-offs to the  consolidated
                  financial  statements  of MCI or  material  reductions  in the
                  anticipated consolidated revenues or operating income of MCI.

                  (k)  Section  203 of the DGCL  Not  Applicable.  The  Board of
         Directors of MCI has approved the Merger and this  Agreement,  and such
         approval is  sufficient to render  inapplicable  to the Merger and this
         Agreement  and the  transactions  contemplated  by this  Agreement  the
         provisions of Section 203 of the DGCL. To the best knowledge of MCI, no
         other state takeover  statute or similar statute or regulation  applies
         or  purports  to  apply to the  Merger,  this  Agreement  or any of the
         transactions contemplated by this Agreement.

     (l) Vote Required. The affirmative vote of the holders of a majority of the
outstanding  shares of MCI Common Stock and the affirmative  vote of the holders
of a majority of the outstanding shares of MCI Class A Common Stock, each voting
as a

<PAGE>


                                                        17

         separate  class (the  "Required MCI Votes"),  are the only votes of the
         holders  of any class or  series  of MCI  capital  stock  necessary  to
         approve  this  Agreement  and  the  transactions   contemplated  hereby
         (assuming  for  purposes  of this  representation  the  accuracy of the
         representations  contained in Section 3.2(o),  without giving effect to
         the knowledge qualification thereto).

                  (m) MCI Rights  Agreement.  The MCI Rights  Agreement has been
         amended so as to provide  that neither BT nor Merger Sub will become an
         "Acquiring   Person"   and  that  no   "Stock   Acquisition   Date"  or
         "Distribution  Date"  (as such  terms  are  defined  in the MCI  Rights
         Agreement)  will  occur  as a  result  of the  approval,  execution  or
         delivery of this Agreement or the consummation of the Merger.

                  (n)      Certain Agreements.

                           (i) All  contracts  listed or which would be required
                  to be listed as an exhibit to MCI's Annual Report on Form 10-K
                  under the rules and  regulations  of the SEC  relating  to the
                  business of MCI and its  Subsidiaries  and any contracts  that
                  would be required to be so listed but for the  exception  with
                  respect to listing  contracts  made in the ordinary  course of
                  business (the "MCI Material  Contracts") are valid and in full
                  force and  effect  except to the extent  they have  previously
                  expired in  accordance  with their terms,  and neither MCI nor
                  any of its  Subsidiaries  has  violated any  provision  of, or
                  committed or failed to perform any act which,  with or without
                  notice,  lapse of time,  or both,  would  constitute a default
                  under  the  provisions  of,  any such MCI  Material  Contract,
                  except for defaults  which,  individually or in the aggregate,
                  would not have a Material  Adverse  Effect on MCI. To the best
                  knowledge  of MCI, no  counterparty  to any such MCI  Material
                  Contract has violated any provision of, or committed or failed
                  to perform  any act which,  with or without  notice,  lapse of
                  time,  or both,  would  constitute  a default or other  breach
                  under the  provisions of, such MCI Material  Contract,  except
                  for  defaults  or  breaches  which,  individually  or  in  the
                  aggregate, would not have a Material Adverse Effect on MCI.

                           (ii) Except for existing  agreements  between MCI and
                  BT, as of the date of this  Agreement  neither  MCI nor any of
                  its Subsidiaries  nor any of their  respective  affiliates has
                  entered  into  any  agreement  or   arrangement   limiting  or
                  otherwise restricting MCI or any of its Subsidiaries or any of
                  their  respective  affiliates or  successors  from engaging or
                  competing in any line of business or in any geographic area.



<PAGE>


                                                        18

                  (o)      Employee Benefit Plans; Labor Matters.

                           (i)  With  respect  to each  employee  benefit  plan,
                  program,   arrangement   and  contract   (including,   without
                  limitation, any "employee benefit plan," as defined in Section
                  3(3) of the Employee  Retirement  Income Security Act of 1974,
                  as amended  ("ERISA")  and any bonus,  deferred  compensation,
                  stock bonus,  stock purchase,  restricted stock, stock option,
                  employment, termination, change in control and severance plan,
                  program, arrangement and contract), to which MCI or any of its
                  Subsidiaries is a party, which is maintained or contributed to
                  by MCI or any of its  Subsidiaries,  or with  respect to which
                  MCI or any of its Subsidiaries  could incur material liability
                  under Section 4069, 4201 or 4212(c) of ERISA (the "MCI Benefit
                  Plans"), MCI has made available to BT a true and complete copy
                  of (A) such MCI  Benefit  Plan,  (B) the  most  recent  annual
                  report  (Form 5500) filed with the  Internal  Revenue  Service
                  (the  "IRS"),  (C) each  trust or  other  funding  arrangement
                  relating to such MCI Benefit Plan, (D) the most recent summary
                  plan description  related to each MCI Benefit Plan for which a
                  summary  plan  description  is  required,  (E) the most recent
                  actuarial  report (if  applicable)  relating to an MCI Benefit
                  Plan and (F) the most  recent  determination  letter,  if any,
                  issued  by the  IRS  with  respect  to any  MCI  Benefit  Plan
                  qualified under Section 401(a) of the Code.

                           (ii)  Each  of  the  MCI  Benefit  Plans  that  is an
                  "employee  pension benefit plan" within the meaning of Section
                  3(2) of  ERISA  and that is  intended  to be  qualified  under
                  Section   401(a)  of  the  Code  has   received  a   favorable
                  determination letter from the IRS, and MCI is not aware of any
                  circumstances  likely to result in the  revocation of any such
                  favorable  determination  letter  that  would  have a Material
                  Adverse Effect on MCI.

                           (iii) With respect to the MCI Benefit Plans, no event
                  has occurred  and, to the  knowledge  of MCI,  there exists no
                  condition or set of  circumstances,  in connection  with which
                  MCI or  any  of  its  Subsidiaries  could  be  subject  to any
                  liability  under the terms of such MCI Benefit  Plans,  ERISA,
                  the Code or any other applicable law which, individually or in
                  the aggregate, would have a Material Adverse Effect on MCI.

                           (iv)  MCI has  made  available  to BT all  collective
                  bargaining or other labor union  contracts to which MCI or any
                  of its  Subsidiaries is a party applicable to persons employed
                  by MCI or any of its Subsidiaries and no collective bargaining
                  agreement   is  being   negotiated   by  MCI  or  any  of  its
                  Subsidiaries.  There is no  pending or  threatened  in writing
                  labor dispute,  strike or work stoppage  against MCI or any of
                  its  Subsidiaries  which  may  interfere  with the  respective
                  business activities of MCI or any of its Subsidiaries,  except
                  where such dispute,  strike or work stoppage  would not have a
                  Material


<PAGE>


                                                        19

                  Adverse  Effect on MCI. To the  knowledge of MCI,  neither MCI
                  nor   any   of  its   Subsidiaries,   nor   their   respective
                  representatives  or employees,  has committed any unfair labor
                  practices in connection  with the operation of the  respective
                  businesses of MCI or any of its Subsidiaries,  and there is no
                  pending or threatened in writing  charge or complaint  against
                  MCI or any of its Subsidiaries by the National Labor Relations
                  Board or any comparable state agency, except where such unfair
                  labor practice,  charge or complaint would not have a Material
                  Adverse Effect on MCI.

                  (p) Brokers or Finders. No agent,  broker,  investment banker,
         financial advisor or other firm or Person is or will be entitled to any
         broker's  or finder's  fee or any other  similar  commission  or fee in
         connection with any of the transactions contemplated by this Agreement,
         except Lazard Freres & Co. LLC, whose fees and expenses will be paid by
         MCI in  accordance  with MCI's  agreement  with such  firm,  based upon
         arrangements made by or on behalf of MCI.

                  (q) Opinion of Financial Advisor. MCI has received the opinion
         of Lazard Freres & Co. LLC,  dated the date of this  Agreement,  to the
         effect that, as of such date, the Merger  Consideration  is fair to the
         holders of MCI Common  Stock  (other than BT), a copy of which  opinion
         has been made available to BT.

                  (r)      Intellectual Property Rights.

                           (i) Neither MCI nor any of its  Subsidiaries  (a) has
                  licensed  Intellectual  Property  Rights  owned  by  them  (or
                  licensed  to them by a third  party) to any Person in a manner
                  that would have a Material Adverse Effect on MCI; or (b) is in
                  breach of any  agreements  related to licenses from MCI or its
                  Subsidiaries of Intellectual Property Rights owned by them (or
                  licensed to them by a third  party)  which breach would have a
                  Material   Adverse   Effect  on  MCI,  and  the   transactions
                  contemplated  by this  Agreement  will not  constitute  such a
                  breach or otherwise reduce or impair, in any material respect,
                  the  rights of MCI and its  Subsidiaries  under  such  license
                  agreements.

                           (ii) The terms of licenses of  Intellectual  Property
                  Rights  by  third  parties  to MCI  and its  Subsidiaries  are
                  sufficient to allow MCI and its  Subsidiaries to conduct,  and
                  to continue  to  conduct,  their  businesses  in all  material
                  respects as  currently  conducted.  Neither MCI nor any of its
                  Subsidiaries is in breach of any of the agreements relating to
                  such  licenses  which  breach  would have a  Material  Adverse
                  Effect  on MCI,  and  the  transactions  contemplated  by this
                  Agreement  will  not  constitute  such a breach  or  otherwise
                  impair,  in any  material  respect,  the rights of MCI and its
                  Subsidiaries  under such license  agreements.  For purposes of
                  this clause (ii),  joint  ownership of  Intellectual  Property
                  Rights between MCI and its


<PAGE>


                                                        20

                  Subsidiaries,  on the one hand,  and any other Person,  on the
                  other hand,  shall be deemed to be a license  from such Person
                  to MCI and its Subsidiaries.

                           (iii)  Neither  MCI nor any of its  Subsidiaries  has
                  received  any  written  notice from any Person  regarding  any
                  actual  or  potential  infringements  by  MCI  or  any  of its
                  Subsidiaries of any Intellectual  Property Rights of any other
                  Person which infringements,  individually or in the aggregate,
                  would if proven  have a Material  Adverse  Effect on MCI.  For
                  purposes of this  paragraph  (iii), a challenge by a Person to
                  the ownership of  Intellectual  Property Rights of MCI and its
                  Subsidiaries shall be deemed to be an allegation by the Person
                  so challenging of actual or potential  infringement by MCI and
                  its Subsidiaries.

                           (iv) No claims are pending or, to the best  knowledge
                  of  MCI,   threatened  by  any  Person  with  respect  to  the
                  ownership,  validity  or  enforceability  of any  Intellectual
                  Property Rights or challenging or questioning the right of MCI
                  or any of its  Subsidiaries to use any  Intellectual  Property
                  Rights, except as would not, individually or in the aggregate,
                  have a Material Adverse Effect on MCI.

                           (v) Neither MCI nor any of its  Subsidiaries  has, as
                  of the date of this Agreement,  any outstanding  claim against
                  it of an infringement, the loss of which would have a Material
                  Adverse  Effect  on  MCI;  and  neither  MCI  nor  any  of its
                  Subsidiaries  has made any still  outstanding  claim against a
                  Person of a violation or infringement, the loss of which would
                  have a Material Adverse Effect on MCI.

                           (vi) The ownership of  Intellectual  Property  Rights
                  and the right to secure  such rights  (including  the right to
                  apply  for   patents)   currently   enjoyed  by  MCI  and  its
                  Subsidiaries   will  not  be  affected  by  the   transactions
                  contemplated by this Agreement in any manner that would have a
                  Material Adverse Effect on MCI.

                           (vii)    "Intellectual    Property   Rights"   means:
                  trademarks,  trade names, and service marks whether registered
                  or not and applications to register them;  patents  (including
                  petty patents) and applications  therefor;  industrial  models
                  (including  U.S.  design patents and  registered  designs) and
                  applications therefor; copyrights;  unregistered design rights
                  (in the United Kingdom and like countries); sui generis rights
                  in databases,  semiconductor  topographies and mask works; and
                  rights in confidential information and trade secrets.

     3.2.  Representations  and  Warranties of BT. Except as set forth in the BT
Disclosure  Schedule delivered by BT to MCI at or prior to the execution of this
Agreement (the "BT Disclosure  Schedule")  (each section of which  qualifies the
correspondingly

<PAGE>


                                                        21

numbered  representation  and  warranty  or  covenant  to the  extent  specified
therein), BT represents and warrants to MCI as follows:

                  (a)  Organization,  Standing and Power. Each of BT and each of
         its  Subsidiaries is a corporation  duly organized and validly existing
         under the laws of its jurisdiction of incorporation or organization and
         each of its Subsidiaries  incorporated outside the United Kingdom is in
         good  standing  (with  respect to  jurisdictions  which  recognize  the
         concept  of  good  standing)  under  the  laws of its  jurisdiction  of
         incorporation or organization, has all requisite power and authority to
         own,  lease and operate its  properties and to carry on its business as
         now being  conducted and is duly  qualified and in good standing  (with
         respect to jurisdictions  which recognize the concept of good standing)
         to do business in each jurisdiction in which the nature of its business
         or the ownership or leasing of its properties makes such  qualification
         necessary  other  than in such  jurisdictions  where the  failure so to
         qualify would not,  either  individually  or in the  aggregate,  have a
         Material  Adverse  Effect  on BT.  The  copies  of the  memorandum  and
         articles of  association of BT which were  previously  furnished to MCI
         are true, complete and correct copies of such documents as in effect on
         the date of this Agreement.

                  (b)      Capital Structure.

                           (i) As of September 30, 1996,  the  authorized  share
                  capital  of BT  consists  of (A)  10,500,000,000  BT  Ordinary
                  Shares, of which 6,347,488,575 shares have been issued and (B)
                  one Special  Rights  Redeemable  Preference  Share of (pound)1
                  (the  "Special  Share"),  which has been issued and is held by
                  Her   Majesty's   Government   of  the  United   Kingdom  ("HM
                  Government").  Since  September  30,  1996 to the date of this
                  Agreement, there have been no issuances of shares of BT or any
                  other securities of BT other than issuances of shares pursuant
                  to options or rights  outstanding as of such date to subscribe
                  or purchase BT Ordinary  Shares.  All issued  shares of BT are
                  duly  authorized,  validly issued and fully paid, and no class
                  of share is entitled to preemptive rights, save as provided by
                  Section  89  Companies  Act 1985 of the  United  Kingdom  (the
                  "Companies  Act").  There were outstanding as of September 30,
                  1996 no  options,  warrants or other  rights to acquire  share
                  capital  from  BT  other  than  options  representing,  in the
                  aggregate,  the right to subscribe or purchase  277,400,188 BT
                  Ordinary  Shares.  No options or warrants  or other  rights to
                  acquire  share  capital  from BT have been  issued or  granted
                  since September 30, 1996 to the date of this Agreement.

                           (ii)  As of the  date of this  Agreement,  no  bonds,
                  debentures, notes or other indebtedness of BT having the right
                  to vote on any  matters  on which  shareholders  may vote ("BT
                  Voting Debt") are issued or outstanding.



<PAGE>


                                                        22

                           (iii) Except as  otherwise  set forth in this Section
                  3.2(b),  as of  the  date  of  this  Agreement,  there  are no
                  securities,  options,  warrants,  calls, rights,  commitments,
                  agreements,  arrangements or undertakings of any kind to which
                  BT or any of its  Subsidiaries  is a party or by which  any of
                  them is  bound  obligating  BT or any of its  Subsidiaries  to
                  issue,  deliver or sell,  or cause to be issued,  delivered or
                  sold,  additional  shares or other voting  securities of BT or
                  any  of  its  Subsidiaries  or  obligating  BT or  any  of its
                  Subsidiaries  to issue,  grant,  extend or enter into any such
                  security, option, warrant, call, right, commitment, agreement,
                  arrangement or undertaking.  As of the date of this Agreement,
                  there  are  no  outstanding  obligations  of BT or  any of its
                  Subsidiaries  to repurchase,  redeem or otherwise  acquire any
                  shares  of  BT  or  any  of  its  Subsidiaries,   except  such
                  obligations  of BT with  respect to shares of its wholly owned
                  Subsidiaries  or of  wholly  owned  Subsidiaries  of  BT  with
                  respect to shares of other wholly owned Subsidiaries of BT.

                  (c)      Authority; No Conflicts.

                           (i)  BT  has  all  requisite   corporate   power  and
                  authority  to  enter  into  this  Agreement  and,  subject  to
                  approval of the Merger by the Required BT Vote,  to consummate
                  the  transactions   contemplated  hereby.  The  execution  and
                  delivery  of  this  Agreement  and  the  consummation  of  the
                  transactions  contemplated hereby have been duly authorized by
                  all necessary  corporate  action on the part of BT, subject to
                  the approval by the  shareholders of BT of the Merger and this
                  Agreement and the matters  referred to in Section 5.16 and the
                  creation  and  issue  of a  sufficient  amount  of  authorized
                  ordinary  share  capital  of BT,  the  granting  of  authority
                  pursuant to Section 80  Companies  Act and the  issuance  upon
                  conversion  of  MCI  Common  Stock,  of BT  ADSs,  appropriate
                  alterations  to the  Articles  of  Association  of BT and  the
                  change of name referred to in Section 5.17. This Agreement has
                  been duly executed and delivered by BT and constitutes a valid
                  and  binding  agreement  of  BT,  enforceable  against  it  in
                  accordance with its terms,  except as such  enforceability may
                  be  limited   by   bankruptcy,   insolvency,   reorganization,
                  moratorium  and other  similar  laws  relating to or affecting
                  creditors generally,  by general equity principles (regardless
                  of whether such  enforceability  is considered in a proceeding
                  in equity or at law) or by an implied  covenant  of good faith
                  and fair dealing.

                           (ii) The  execution  and  delivery of this  Agreement
                  does not or will not, as the case may be, and the consummation
                  of the  transactions  contemplated  hereby will not, result in
                  any  Violation  of: (A) any  provision  of the  memorandum  or
                  articles  of  association  of  BT  or  comparable  charter  or
                  organizational documents of any Subsidiary of BT or (B) except
                  as would not have a Material  Adverse Effect on BT and subject
                  to  obtaining  or  making  the  consents,  approvals,  orders,
                  authorizations, registrations, declarations and


<PAGE>


                                                        23

                  filings  referred to in  paragraph  (iii)  below,  any loan or
                  credit agreement,  note,  mortgage,  bond,  indenture,  lease,
                  benefit  plan  or  other  agreement,  obligation,  instrument,
                  permit,  concession,   franchise,  license,  judgment,  order,
                  decree, statute, law, ordinance, rule or regulation applicable
                  to BT or any Subsidiary of BT or their  respective  properties
                  or assets.

                           (iii) No consent,  approval,  order or  authorization
                  of,  or   registration,   declaration   or  filing  with,  any
                  Governmental  Entity is required  by or with  respect to BT or
                  any  Subsidiary  of BT in  connection  with the  execution and
                  delivery of this Agreement by BT or the  consummation by BT of
                  the  transactions  contemplated  hereby,  except  for  (A) the
                  Required Consents, (B) the appropriate  applications,  filings
                  and notices  to, and  approval  of, the LSE and the NYSE,  (C)
                  those  required  under the  Companies Act and the FSA, (D) the
                  consent of H.M.  Treasury pursuant to Section 765(1)(c) of the
                  Income and  Corporation  Taxes Act 1988 and (E) such consents,
                  approvals, orders, authorizations, registrations, declarations
                  and filings  the failure of which to make or obtain  would not
                  have a Material Adverse Effect on BT.

                  (d)      Reports and Financial Statements.

                           (i) BT has filed  all  required  reports,  schedules,
                  forms,  statements and other documents required to be filed by
                  it with the SEC since April 1, 1995  (collectively,  including
                  all exhibits thereto, the "BT SEC Reports").  No Subsidiary of
                  BT is required to file any form, report or other document with
                  the SEC.  None of the BT SEC Reports,  as of their  respective
                  dates (and,  if amended or superseded by a filing prior to the
                  date of this  Agreement  or of the Closing  Date,  then on the
                  date of such  filing),  contained  or will  contain any untrue
                  statement of a material  fact or omitted or will omit to state
                  a material fact required to be stated  therein or necessary to
                  make the  statements  therein,  in light of the  circumstances
                  under  which  they  were  made,  not  misleading.  Each of the
                  financial statements (including the related notes) included in
                  the BT SEC Reports presents fairly, in all material  respects,
                  the consolidated  financial position and consolidated  results
                  of operations and cash flows of BT and its  Subsidiaries as of
                  the respective  dates or for the respective  periods set forth
                  therein,  all in conformity  with  accounting  principles  and
                  practices generally accepted in the United Kingdom ("UK GAAP")
                  consistently  applied during the periods  involved,  except as
                  otherwise noted therein. The financial  information  contained
                  in the unaudited  interim  financial  statements for the three
                  months ended June 30, 1996 has been prepared with all due care
                  and  attention  and in  accordance  with UK  GAAP  (on a basis
                  consistent  with the financial  statements  included in the BT
                  SEC Reports)  insofar as appropriate in the  preparation of an
                  unaudited   interim  statement  and  all  statements  of  fact
                  contained   in  such   statement   relating   to  BT  and  its
                  Subsidiaries  are, in the context of such statement,  true and
                  accurate in all material respects and not


<PAGE>


                                                        24

                  misleading  in any  material  respect and all  expressions  of
                  opinion,  intention and expectation contained therein are fair
                  and  honestly  held and have been made  after due and  careful
                  enquiry and  consideration.  All of the BT SEC Reports,  as of
                  their respective dates (and as of the date of any amendment to
                  the  respective  BT SEC  Report),  complied  as to form in all
                  material  respects  with the  applicable  requirements  of the
                  Securities  Act  and  the  Exchange  Act  and  the  rules  and
                  regulations promulgated thereunder.

                           (ii) Except as set forth in the BT SEC Reports  filed
                  prior  to  the  date  of  this   Agreement,   and  except  for
                  liabilities and obligations incurred in the ordinary course of
                  business  consistent  with past practice since March 31, 1996,
                  neither BT nor any of its  Subsidiaries has any liabilities or
                  obligations  of  any  nature   (whether   accrued,   absolute,
                  contingent  or  otherwise)  which,   individually  or  in  the
                  aggregate, would have a Material Adverse Effect on BT or would
                  prevent or materially  delay the performance of this Agreement
                  by BT.

                  (e)      Information Supplied.

                           (i)  None  of  the  information  supplied  or  to  be
                  supplied by BT for inclusion or  incorporation by reference in
                  (A) the Form F-4 will,  at the time the Form F-4 is filed with
                  the SEC, at any time it is amended or  supplemented  or at the
                  time it becomes  effective under the Securities  Act,  contain
                  any untrue  statement of a material  fact or omit to state any
                  material  fact  required to be stated  therein or necessary to
                  make the  statements  therein not misleading and (B) the Proxy
                  Statement/Prospectus  and, if  applicable,  the Schedule 13E-3
                  will, at the date it is first mailed to MCI stockholders or at
                  the time of the MCI Stockholders  Meeting,  contain any untrue
                  statement  of a  material  fact or omit to state any  material
                  fact  required to be stated  therein or  necessary in order to
                  make the  statements  therein,  in light of the  circumstances
                  under which they were made, not misleading.  The BT Disclosure
                  Document and any  supplements  thereto and any other circulars
                  or   documents   issued   to   shareholders,    employees   or
                  debentureholders  of BT will contain all particulars  relating
                  to BT and MCI required to comply in all material respects with
                  all  United  Kingdom  statutory  and  other  legal  provisions
                  (including, without limitation, the Companies Act, the FSA and
                  the rules and  regulations  made  thereunder and the rules and
                  requirements of the LSE) and all such information contained in
                  such documents will be  substantially  in accordance  with the
                  facts and will not omit anything material likely to affect the
                  import  of such  information.  The  Form  F-4  and  the  Proxy
                  Statement/Prospectus  will  comply as to form in all  material
                  respects  with the  requirements  of the  Exchange Act and the
                  Securities  Act  and  the  rules  and  regulations  of the SEC
                  thereunder.



<PAGE>


                                                        25

                           (ii) The information supplied or to be supplied by BT
                  for inclusion in the BT Disclosure  Document will, on the date
                  the BT Disclosure  Document is first mailed to shareholders of
                  BT, and at the time of the BT Shareholder Meeting, comply with
                  the provisions of section 146 of the FSA.

                           (iii)  Notwithstanding  the  foregoing  provisions of
                  this Section 3.2(e),  no representation or warranty is made by
                  BT  with  respect  to  statements   made  or  incorporated  by
                  reference in the Form F-4, the Proxy Statement/Prospectus, the
                  Schedule 13E-3 (if  applicable) or the BT Disclosure  Document
                  based  on  information   supplied  by  MCI  for  inclusion  or
                  incorporation by reference therein.

                  (f) Compliance with Applicable Laws;  Regulatory  Matters.  BT
         and  its  Subsidiaries  hold  all  permits,   licenses,   certificates,
         franchises, registrations,  variances, exemptions, orders and approvals
         of all Governmental Entities which are material to the operation of the
         businesses  of BT and  its  Subsidiaries,  taken  as a whole  (the  "BT
         Permits").  BT and its Subsidiaries are in compliance with the terms of
         the BT Permits, except where the failure so to comply,  individually or
         in the  aggregate,  would  not have a  Material  Adverse  Effect on BT.
         Except as  disclosed  in the BT SEC Reports  filed prior to the date of
         this Agreement, the businesses of BT and its Subsidiaries are not being
         and  have not  been  conducted  in  violation  of any  law,  ordinance,
         regulation,   judgment,  decree,  injunction,  rule  or  order  of  any
         Governmental  Entity,  except for violations which,  individually or in
         the  aggregate,  would not have a Material  Adverse Effect on BT. As of
         the date of this Agreement,  no investigation  (other than with respect
         to Taxes) by any  Governmental  Entity with respect to BT or any of its
         Subsidiaries  is pending or, to the best  knowledge of BT,  threatened,
         other than  investigations  which,  individually  or in the  aggregate,
         would not have a Material  Adverse  Effect on BT.  Since  December  31,
         1994,  BT and each of its  Subsidiaries  required to make filings under
         all applicable laws regulating the telephone,  mobile cellular,  paging
         or other  telecommunications  business  has filed  with all  applicable
         Governmental  Entities  all  material  forms,  statements,  reports and
         documents  (including  exhibits,  annexes and any  amendments  thereto)
         required to be filed by them,  and each such filing  complied  with all
         applicable laws, rules and regulations,  except for such  noncompliance
         which  would not,  individually  or in the  aggregate,  have a Material
         Adverse Effect on BT or prevent or materially  delay the performance of
         this Agreement by BT.

                  (g)  Litigation.  Except as  disclosed  in the BT SEC  Reports
         filed  prior to the  date of this  Agreement,  there is no  litigation,
         arbitration,  claim, suit, action,  investigation or proceeding pending
         or, to the knowledge of BT, threatened,  against or affecting BT or any
         Subsidiary of BT which,  individually  or in the aggregate,  has had or
         would have a Material  Adverse Effect on BT, nor is there any judgment,
         award, decree, injunction,  rule or order of any Governmental Entity or
         arbitrator


<PAGE>


                                                        26

         outstanding  against BT or any Subsidiary of BT which,  individually or
         in the  aggregate,  has had or would have a Material  Adverse Effect on
         BT.

                  (h) Taxes. (i) BT and each of its  Subsidiaries  have prepared
         in good  faith and duly and  timely  filed  (taking  into  account  any
         extension  of time  within  which to file)  all  material  Tax  Returns
         required  to be filed by any of them and all such filed Tax Returns are
         complete and accurate in all material respects; (ii) BT and each of its
         Subsidiaries  have paid all Taxes  that are shown as due on such  filed
         Tax  Returns  or that BT or any of its  Subsidiaries  is  obligated  to
         withhold from amounts  owing to any employee,  creditor or third party,
         except  with  respect  to matters  contested  in good faith or for such
         amounts  that,  individually  or in the  aggregate,  would  not  have a
         Material  Adverse Effect on BT; (iii) as of the date of this Agreement,
         there are no pending or, to the best  knowledge  of BT,  threatened  in
         writing  material  audits,   examinations,   investigations   or  other
         proceedings in respect of Taxes or Tax matters relating to BT or any of
         its Subsidiaries;  (iv) there are not, to the best knowledge of BT, any
         unresolved   questions  or  claims   concerning   its  or  any  of  its
         Subsidiaries'  Tax  liability  that  would,   individually  or  in  the
         aggregate,  have a  Material  Adverse  Effect  on BT and  there  are no
         deficiencies or claims for any Taxes that have been proposed,  asserted
         or  assessed  against  BT or any of its  Subsidiaries  which,  if  such
         deficiencies or claims were finally  resolved  against BT or any of its
         Subsidiaries,  would, individually or in the aggregate, have a Material
         Adverse  Effect on BT; (v) neither BT nor any of its  Subsidiaries  has
         any liability with respect to Taxes in excess of the amounts accrued in
         respect thereof that are reflected in the financial statements included
         in the BT SEC  Reports,  except such excess  liabilities  as would not,
         individually or in the aggregate, have a Material Adverse Effect on BT;
         and (vi) there are no material Liens for Taxes upon the assets of BT or
         any of its Subsidiaries, other than Liens for current Taxes not yet due
         and payable and Liens for Taxes that are being  contested in good faith
         by appropriate proceedings.

                  (i)  Subsidiaries  and  Equity  Interests.   Note  31  of  the
         Consolidated  Financial  Statements  of BT filed as part of BT's Annual
         Report on Form 20-F for the fiscal year ended  March 31, 1996  includes
         all the Subsidiaries of BT as of the date of this Agreement required to
         be included on such  exhibit by the rules and  regulations  of the SEC,
         were it to be  filed on the date of this  Agreement.  Unless  otherwise
         described therein, BT owns, directly or indirectly, beneficially and of
         record 100% of the issued and  outstanding  voting  securities  of each
         such Subsidiary  (other than  directors'  qualifying  shares,  if any).
         Section 3.2(i) of the BT Disclosure  Schedule  lists each  corporation,
         partnership,  limited  liability company or similar entity with respect
         to which, as of the date of this Agreement,  BT or any Subsidiary of BT
         owns more  than 5% but less than a  majority  of the  voting  equity or
         similar  voting   interest  or  any  interest   convertible   into,  or
         exchangeable or exercisable  for, more than 5% but less than a majority
         of the voting equity or similar  voting  interest and which interest is
         carried on BT's most recent financial  statements (or if not held as of
         the date  thereof,  would be carried on BT's  financial  statements  if
         prepared as of the date


<PAGE>


                                                        27

         hereof) at a value in excess of  (pound)10,000,000  (collectively,  the
         "BT  Equity  Interests").  There  are no  plans to  restructure  in any
         material respect any of the BT Equity  Interests.  All of the shares of
         capital  stock  of each of the  Subsidiaries  and all of the BT  Equity
         Interests  held by BT and  each  Subsidiary  of BT are  fully  paid and
         nonassessable (with respect to jurisdictions that recognize the concept
         of  nonassessability)  and are owned by BT or such  Subsidiary free and
         clear of any Lien. There are no outstanding  contractual obligations of
         BT or any of  its  Subsidiaries  to  provide  funds  to,  or  make  any
         investment (in the form of a loan,  capital  contribution or otherwise)
         in, any Subsidiary of BT (other than wholly owned  Subsidiaries of BT),
         any  entity  in  which  BT or any  Subsidiary  of BT  owns a BT  Equity
         Interest,  or any other Person,  except such  obligations  as would not
         require any  investment or provision of funds or assets in an amount or
         having a fair market value in excess of (pound)10,000,000  for any such
         investment  or   (pound)50,000,000   in  the  aggregate  for  all  such
         investments.

                  (j)      Absence of Certain Changes or Events.

                           (i) Except as disclosed  in the BT SEC Reports  filed
                  and publicly  available prior to the date of this Agreement or
                  disclosed  in LSE  announcements  prior  to the  date  of this
                  Agreement:  (A) since March 31, 1996, BT and its  Subsidiaries
                  have  conducted  their  respective  businesses in the ordinary
                  course  consistent  with  their  past  practices  and have not
                  incurred any material liability, except in the ordinary course
                  of their  respective  businesses  consistent  with  their past
                  practices;  (B)  since  March  31,  1996  to the  date of this
                  Agreement,  there has not been any  change in or effect on, or
                  any event or circumstance involving a prospective change in or
                  effect on, the  business,  financial  condition  or results of
                  operations of BT or any of its Subsidiaries,  that has had, or
                  would  have,  a Material  Adverse  Effect on BT; and (C) since
                  March 31, 1996, there has not been any change in or effect on,
                  or any event or circumstance involving a prospective change in
                  or effect on, the business,  financial condition or results of
                  operations of BT or any of its  Subsidiaries  that has had, or
                  is reasonably likely to have, a material adverse effect on the
                  business,  operations, assets, liabilities (including, without
                  limitation,  contingent  liabilities),  financial condition or
                  results of operations of BT and its  Subsidiaries,  taken as a
                  whole, other than as a result of (1) changes after the date of
                  this   Agreement  in  general   economic   conditions  or  the
                  securities  markets,  and  (2)  legal  or  regulatory  changes
                  effective  after  the  date of this  Agreement  affecting  the
                  telecommunications industry generally.

                           (ii) As of the  date of this  Agreement,  no plans or
                  proposals  are  under  consideration  by  BT  to  announce  or
                  implement any  restructuring or other similar actions by BT or
                  any of its  Subsidiaries  which would be reasonably  likely to
                  result in material charges or write-offs to the consolidated


<PAGE>


                                                        28

                  financial  statements  of BT or  material  reductions  in  the
                  anticipated consolidated revenues or operating income of BT.

                  (k) Vote  Required.  The  affirmative  vote of not  less  than
         three-fourths  of such members of BT as (being  entitled to do so) vote
         at the BT Shareholder Meeting (the "Required BT Vote") is the only vote
         or  approval  of the  holders  of any class of BT shares  necessary  to
         approve this Agreement and the transactions contemplated hereby.

                  (l)      Certain Agreements.

                           (i) All  contracts  listed or which would be required
                  to be listed as an exhibit to BT's most recent  Annual  Report
                  on Form  20-F  under  the  rules  and  regulations  of the SEC
                  relating to the  business of BT and its  Subsidiaries  and any
                  contracts  that would be  required to be so listed but for the
                  exception  with  respect  to  listing  contracts  made  in the
                  ordinary course of business (the "BT Material  Contracts") are
                  valid and in full force and effect  except to the extent  they
                  have previously  expired in accordance  with their terms,  and
                  neither  BT nor  any  of its  Subsidiaries  has  violated  any
                  provision of, or committed or failed to perform any act which,
                  with  or  without  notice,  lapse  of  time,  or  both,  would
                  constitute a default under the  provisions of, any BT Material
                  Contract,  except for defaults  which,  individually or in the
                  aggregate,  would not have a Material Adverse Effect on BT. To
                  the  best  knowledge  of BT,  no  counterparty  to any such BT
                  Material  Contract has violated any provision of, or committed
                  or failed to perform  any act which,  with or without  notice,
                  lapse of time,  or both,  would  constitute a default or other
                  breach  under the  provisions  of, such BT Material  Contract,
                  except for defaults or breaches which,  individually or in the
                  aggregate, would not have a Material Adverse Effect on BT.

                           (ii) Except for existing  agreements  between MCI and
                  BT, as of the date of this Agreement neither BT nor any of its
                  Subsidiaries  nor  any  of  their  respective  affiliates  has
                  entered  into  any  agreement  or   arrangement   limiting  or
                  otherwise  restricting BT or any of its Subsidiaries or any of
                  their  respective  affiliates or  successors  from engaging or
                  competing in any line of business or in any geographic area.

                  (m)      Employee Benefit Plans; Labor Matters.

                           (i)  Trade  Disputes.  Neither  BT  nor  any  of  its
                  Subsidiaries  is involved  in, and,  to the  knowledge  of BT,
                  there  are no  circumstances  likely  to  give  rise  to,  any
                  industrial  or trade  dispute or any  dispute  or  negotiation
                  regarding a claim of material  importance with any trade union
                  or other body  which has had or would have a Material  Adverse
                  Effect on BT.


<PAGE>


                                                        29


                           (ii)  Pensions.  BT has made available to MCI copies,
                  as of the date of this  Agreement,  of: (A) the current  trust
                  deeds and rules of each of the  material  schemes  to which BT
                  and its  Subsidiaries  make or  could  become  liable  to make
                  payments for providing retirement,  death,  disability or life
                  assurance  benefits  (the "BT Schemes")  (including  any draft
                  amendments);   (B)  the  most  recently  prepared  explanatory
                  booklets and announcements relating to each of the BT Schemes;
                  and (C) a copy of the actuary's report on the latest actuarial
                  valuation of the BT Schemes,  if  applicable.  With respect to
                  the BT Schemes, no event has occurred and, to the knowledge of
                  BT,  there exists no  condition  or set of  circumstances,  in
                  connection with which BT or any of its  Subsidiaries  could be
                  subject to any  liability  under the terms of such BT Schemes,
                  the Pension  Schemes Act of 1993 or any other  applicable  law
                  which, individually or in the aggregate, would have a Material
                  Adverse Effect on BT.

                  (n) Brokers or Finders. No agent,  broker,  investment banker,
         financial advisor or other firm or Person is or will be entitled to any
         broker's  or finder's  fee or any other  similar  commission  or fee in
         connection with any of the transactions contemplated by this Agreement,
         except N M Rothschild & Sons Limited, Rothschild Inc., Morgan Stanley &
         Co. Limited and Cazenove & Co., whose fees and expenses will be paid by
         BT in  accordance  with BT's  agreements  with such  firms,  based upon
         arrangements made by or on behalf of BT.

                  (o)  Ownership  of MCI  Common  Stock.  As of the date of this
         Agreement,  except as contemplated by that certain Amended and Restated
         Investment  Agreement  dated as of January  31,  1994 (the  "Investment
         Agreement")  between  BT and MCI,  neither  BT nor,  to the best of its
         knowledge,  any of its  affiliates  or  associates  (as such  terms are
         defined  under the Exchange  Act) (i)  beneficially  owns,  directly or
         indirectly  or  (ii)  is  party  to  any   agreement,   arrangement  or
         understanding  for  the  purpose  of  acquiring,   holding,  voting  or
         disposing of, in case of either  clause (i) or (ii),  shares of capital
         stock of MCI.

                  (p)      Intellectual Property Rights.

                           (i)  Neither BT nor any of its  Subsidiaries  (a) has
                  licensed  Intellectual  Property  Rights  owned  by  them  (or
                  licensed  to them by a third  party) to any Person in a manner
                  that would have a Material  Adverse Effect on BT; or (b) is in
                  breach of any  agreements  related to licenses  from BT or its
                  Subsidiaries of Intellectual Property Rights owned by them (or
                  licensed to them by a third  party)  which breach would have a
                  Material   Adverse   Effect  on  BT,   and  the   transactions
                  contemplated  by this  Agreement  will not  constitute  such a
                  breach or otherwise reduce or impair, in any material respect,
                  the  rights  of BT and its  Subsidiaries  under  such  license
                  agreements.



<PAGE>


                                                        30

                           (ii) The terms of licenses of  Intellectual  Property
                  Rights  by  third  parties  to BT  and  its  Subsidiaries  are
                  sufficient to allow BT and its Subsidiaries to conduct, and to
                  continue to conduct, their businesses in all material respects
                  as currently conducted. Neither BT nor any of its Subsidiaries
                  is in  breach  of any  of  the  agreements  relating  to  such
                  licenses which breach would have a Material  Adverse Effect on
                  BT, and the  transactions  contemplated by this Agreement will
                  not  constitute  such a breach  or  otherwise  impair,  in any
                  material respect,  the rights of BT and its Subsidiaries under
                  such  license  agreements.  For  purposes of this clause (ii),
                  joint ownership of Intellectual Property Rights between BT and
                  its  Subsidiaries,  on the one hand, and any other Person,  on
                  the other  hand,  shall be  deemed  to be a license  from such
                  Person to BT and its Subsidiaries.

                           (iii)  Neither  BT nor  any of its  Subsidiaries  has
                  received  any  written  notice from any Person  regarding  any
                  actual  or  potential  infringements  by  BT  or  any  of  its
                  Subsidiaries of any Intellectual  Property Rights of any other
                  Person which infringements,  individually or in the aggregate,
                  would if proven  have a  Material  Adverse  Effect on BT.  For
                  purposes of this  paragraph  (iii), a challenge by a Person to
                  the ownership of  Intellectual  Property  Rights of BT and its
                  Subsidiaries shall be deemed to be an allegation by the Person
                  so challenging of actual or potential  infringement  by BT and
                  its Subsidiaries.

                           (iv) No claims are pending or, to the best  knowledge
                  of BT, threatened by any Person with respect to the ownership,
                  validity or enforceability of any Intellectual Property Rights
                  or challenging  or  questioning  the right of BT or any of its
                  Subsidiaries to use any Intellectual  Property Rights,  except
                  as  would  not,  individually  or in  the  aggregate,  have  a
                  Material Adverse Effect on BT.

                           (v) Neither BT nor any of its Subsidiaries has, as of
                  the date of this Agreement,  any outstanding  claim against it
                  of an  infringement,  the loss of which  would have a Material
                  Adverse   Effect  on  BT;  and  neither  BT  nor  any  of  its
                  Subsidiaries  has made any still  outstanding  claim against a
                  Person of a violation or infringement, the loss of which would
                  have a Material Adverse Effect on BT.

                           (vi) The ownership of  Intellectual  Property  Rights
                  and the right to secure  such rights  (including  the right to
                  apply  for   patents)   currently   enjoyed   by  BT  and  its
                  Subsidiaries   will  not  be  affected  by  the   transactions
                  contemplated by this Agreement in any manner that would have a
                  Material Adverse Effect on BT.

     3.3. Representations and Warranties of BT and Merger Sub. BT and Merger Sub
represent and warrant to MCI as follows:

<PAGE>


                                                        31


     (a)  Organization  and Corporate  Power.  Merger Sub is a corporation  duly
incorporated, validly existing and in good standing under the laws of Delaware.
                  (b)  Corporate  Authorization.  Merger  Sub has all  requisite
         corporate  power and  authority  to enter  into this  Agreement  and to
         consummate  the  transactions   contemplated   hereby.  The  execution,
         delivery  and  performance  by  Merger  Sub of this  Agreement  and the
         consummation by Merger Sub of the transactions contemplated hereby have
         been duly authorized by all necessary  corporate  action on the part of
         Merger Sub.  This  Agreement  has been duly  executed and  delivered by
         Merger Sub and constitutes a valid and binding agreement of Merger Sub,
         enforceable  against it in  accordance  with its terms,  except as such
         enforceability    may   be   limited   by    bankruptcy,    insolvency,
         reorganization,  moratorium  and  other  similar  laws  relating  to or
         affecting creditors generally, by general equity principles (regardless
         of whether such  enforceability is considered in a proceeding in equity
         or at law) or by an implied covenant of good faith and fair dealing.

                  (c) Non-Contravention. The execution, delivery and performance
         by Merger Sub of this Agreement and the  consummation  by Merger Sub of
         the transactions  contemplated hereby do not and will not contravene or
         conflict with the  certificate  of  incorporation  or by-laws of Merger
         Sub.

     (d) No Business  Activities.  Merger Sub has not conducted  any  activities
other than in connection  with the  organization  of Merger Sub, the negotiation
and  execution  of this  Agreement  and  the  consummation  of the  transactions
contemplated hereby. Merger Sub has no Subsidiaries.

                                   ARTICLE IV

                    COVENANTS RELATING TO CONDUCT OF BUSINESS


                  4.1. Covenants of MCI. During the period from the date of this
Agreement and continuing  until the Effective  Time, MCI agrees as to itself and
its  Subsidiaries  that (except as expressly  contemplated  or permitted by this
Agreement or as otherwise  indicated  on the MCI  Disclosure  Schedule or to the
extent that BT shall otherwise consent in writing):

                  (a)      Ordinary Course.

                           (i) MCI and its  Subsidiaries  shall  carry  on their
                  respective  businesses  in the  usual,  regular  and  ordinary
                  course in all material  respects,  in  substantially  the same
                  manner as heretofore  conducted,  and shall use all reasonable
                  efforts to preserve  intact their  present  lines of business,
                  maintain  their  rights  and  franchises  and  preserve  their
                  relationships with customers,


<PAGE>


                                                        32

                  suppliers and others having business dealings with them to the
                  end that their ongoing businesses shall not be impaired in any
                  material  respect at the Effective  Time;  provided,  however,
                  that no  action by MCI or its  Subsidiaries  with  respect  to
                  matters specifically  addressed by any other provision of this
                  Section 4.1 shall be deemed a breach of this Section 4.1(a)(i)
                  unless such action would constitute a breach of one or more of
                  such other provisions.

                           (ii) MCI shall  not,  and shall not permit any of its
                  Subsidiaries  to,  (A)  enter  into any new  material  line of
                  business  or (B) incur or commit to any  capital  expenditures
                  other than  capital  expenditures  incurred or committed to in
                  the ordinary course of business  consistent with past practice
                  and which,  together  with all such  expenditures  incurred or
                  committed to during any fiscal year, are not in excess of 115%
                  of the  aggregate  amounts set forth in Section  4.1(a) of the
                  MCI Disclosure Schedule.

                  (b) Dividends;  Changes in Share  Capital.  MCI shall not, and
         shall not permit any of its  Subsidiaries to, and shall not propose to,
         (i)  declare or pay any  dividends  on or make other  distributions  in
         respect of any of its capital  stock,  except (A) MCI may  continue the
         declaration  and payment of regular  semiannual  cash  dividends not in
         excess of $0.025 per share of MCI Common Stock, in each case with usual
         record and payment dates for such  dividends in  accordance  with MCI's
         past  practice and (B) dividends by wholly owned  Subsidiaries  of MCI,
         (ii) split,  combine or reclassify any of its capital stock or issue or
         authorize  or propose the issuance of any other  securities  in respect
         of, in lieu of or in  substitution  for,  shares of its capital  stock,
         except for any such  transaction  by a wholly owned  Subsidiary  of MCI
         which  remains a wholly owned  Subsidiary  after  consummation  of such
         transaction,  or (iii)  repurchase,  redeem or  otherwise  acquire  any
         shares  of its  capital  stock or any  securities  convertible  into or
         exercisable for any shares of its capital stock except for the purchase
         from time to time by MCI of MCI Common Stock in the ordinary  course of
         business  consistent  with past  practice  in  connection  with the MCI
         Benefit Plans.

                  (c)  Issuance of  Securities.  Except as set forth in Sections
         5.8  and  5.9(b),  MCI  shall  not  and  shall  not  permit  any of its
         Subsidiaries  to,  issue,  deliver or sell, or authorize or propose the
         issuance,  delivery or sale of, any shares of its capital  stock of any
         class,  any MCI  Voting  Debt  or any  securities  convertible  into or
         exercisable  for,  or any rights,  warrants or options to acquire,  any
         such  shares or MCI  Voting  Debt,  or enter  into any  agreement  with
         respect to any of the foregoing and shall not amend any  equity-related
         awards  issued  pursuant to the MCI Benefit  Plans,  other than (i) the
         issuance  of MCI Common  Stock  (and the  associated  Rights)  upon the
         exercise of stock options issued in the ordinary course of business and
         consistent  with past practice in accordance  with the terms of the MCI
         Stock  Option  Plans as in effect on the date of this  Agreement,  (ii)
         issuances by a wholly owned  Subsidiary of MCI of capital stock to such
         Subsidiary's  parent and (iii)  issuances  of options,  rights or other
         awards, and amendments to equity-related awards, in the ordinary course
         of business


<PAGE>


                                                        33

         and  consistent  with past  practice  pursuant to the MCI Stock  Option
         Plans as in effect on the date of this Agreement.

                  (d)  Governing  Documents.  Except to the extent  required  to
         comply with their respective obligations hereunder,  required by law or
         required  by  the  rules  and  regulations  of  NASDAQ,   MCI  and  its
         Subsidiaries  shall  not amend or  propose  to amend  their  respective
         certificates of incorporation, by-laws or other governing documents.

                  (e) No  Acquisitions.  Other than  acquisitions in existing or
         related  lines of business  of MCI the fair  market  value of the total
         consideration  (including the value of  indebtedness or other liability
         acquired or assumed) for which does not exceed $50,000,000 individually
         or $200,000,000  in the aggregate,  MCI shall not, and shall not permit
         any of its  Subsidiaries  to, acquire or agree to acquire by merging or
         consolidating  with, or by purchasing a substantial  equity interest in
         or a substantial  portion of the assets of, or by any other manner, any
         business or any corporation, partnership, association or other business
         organization  or  division  thereof  or  otherwise  acquire or agree to
         acquire any assets  (other than the  acquisition  of assets used in the
         operations of the business of MCI and its  Subsidiaries in the ordinary
         course);  provided,  however, that the foregoing shall not prohibit (x)
         internal   reorganizations   or   consolidations   involving   existing
         Subsidiaries  of MCI or (y) the  creation  of new  Subsidiaries  of MCI
         organized to conduct or continue activities otherwise permitted by this
         Agreement.

                  (f) No Dispositions.  Other than (i) internal  reorganizations
         or  consolidations   involving  existing   Subsidiaries  of  MCI,  (ii)
         dispositions  referred to in MCI SEC Reports filed prior to the date of
         this  Agreement  and (iii) as may be required by law in order to permit
         the consummation of the  transactions  contemplated  hereby,  MCI shall
         not,  and shall not  permit  any  Subsidiary  of MCI to,  sell,  lease,
         encumber or otherwise dispose of, or agree to sell, lease,  encumber or
         otherwise  dispose of, any of its assets  (including  capital  stock of
         Subsidiaries  of  MCI)  which  are  material,  individually  or in  the
         aggregate, to MCI.

                  (g)  Indebtedness.  MCI shall not, and shall not permit any of
         its  Subsidiaries to, (i) incur or suffer to exist any indebtedness for
         borrowed money or guarantee any such  indebtedness or issue or sell any
         debt securities or warrants or rights to acquire any debt securities of
         MCI or any of its  Subsidiaries  or guarantee  any debt  securities  of
         other Persons other than  indebtedness  of MCI or any Subsidiary of MCI
         to MCI  or any  wholly  owned  Subsidiary  of MCI  and  other  than  as
         permitted  pursuant to Section 4.1(g) of the MCI  Disclosure  Schedule,
         (ii)  make  any  loans,   advances  or  capital  contributions  to,  or
         investments in, any other Person,  other than by MCI or a Subsidiary of
         MCI to or in MCI or any  Subsidiary  of MCI or (iii) pay,  discharge or
         satisfy any claims,  liabilities  or  obligations  (absolute,  accrued,
         asserted or  unasserted,  contingent or  otherwise),  other than in the
         case of clauses (ii) and (iii),


<PAGE>


                                                        34

         loans,   advances,   capital  contributions,   investments,   payments,
         discharges  or  satisfactions  incurred or committed to in the ordinary
         course of business consistent with past practice.

                  (h) Benefit  Plans.  Subject to Sections  5.8 and 5.9(b),  MCI
         shall  not,  and shall  not  permit  any of its  Subsidiaries  to,  (i)
         increase the  compensation  payable or to become  payable to any of its
         executive officers or employees or (ii) take any action with respect to
         the grant of any severance or termination  pay, or stay, bonus or other
         incentive  arrangement  (other  than  pursuant  to  benefit  plans  and
         policies  in effect  on the date of this  Agreement),  except  any such
         increases  or grants made in the  ordinary  course of  business  and in
         accordance with past practice.

                  (i) Other Actions.  MCI shall not, and shall not permit any of
         its  Subsidiaries  to,  take  any  action  that  would,  or that  could
         reasonably be expected to, result in (i) any of the  representations or
         warranties of MCI set forth in this  Agreement that are qualified as to
         materiality  becoming  untrue,  (ii)  any of  such  representations  or
         warranties  that are not so qualified  becoming  untrue in any material
         respect or (iii) except as  otherwise  permitted by Section 5.7, any of
         the  conditions  to the  Merger  set  forth  in  Article  VI not  being
         satisfied.

                  (j)  Accounting  Methods;  Income  Tax  Elections.  Except  as
         disclosed in MCI SEC Reports filed prior to the date of this Agreement,
         or as  required  by a  Governmental  Entity,  MCI shall not  change its
         methods  of  accounting  in  effect at  December  31,  1995,  except as
         required  by changes in US GAAP as  concurred  in by MCI's  independent
         auditors.  MCI shall not (i) change  its  fiscal  year or (ii) make any
         material Tax  election,  other than in the ordinary  course of business
         consistent with past practice, without consultation with BT.

                  (k)  Tax-Free  Qualification.  MCI  shall  not,  and shall not
         permit any of its  Subsidiaries  to, take any action that would prevent
         or impede (i) the Merger from  qualifying as a tax-free  reorganization
         under  Section 368 of the Code or (ii) either party from  obtaining the
         Required Consents.

                  (l) Certain  Agreements.  MCI shall not,  and shall not permit
         any of its  Subsidiaries  to, enter into any  agreement or  arrangement
         that limits or otherwise  restricts MCI or any of its  Subsidiaries  or
         any of their  respective  affiliates or any  successor  thereto or that
         could, after the Closing, limit or restrict BT or any of its affiliates
         or any  successor  thereto  from  engaging or  competing in any line of
         business or in any geographic area.

                  4.2.  Covenants of BT. During the period from the date of this
Agreement and  continuing  until the Effective  Time, BT agrees as to itself and
its  Subsidiaries  that (except as expressly  contemplated  or permitted by this
Agreement or as  otherwise  indicated  on the BT  Disclosure  Schedule or to the
extent that MCI shall otherwise consent in writing):


<PAGE>


                                                        35


                  (a)      Ordinary Course.

                           (i) BT and its  Subsidiaries  shall  carry  on  their
                  respective  businesses  in the  usual,  regular  and  ordinary
                  course in all material  respects,  in  substantially  the same
                  manner as heretofore  conducted,  and shall use all reasonable
                  efforts to preserve  intact their  present  lines of business,
                  maintain  their  rights  and  franchises  and  preserve  their
                  relationships  with  customers,  suppliers  and others  having
                  business  dealings  with  them to the end that  their  ongoing
                  businesses  shall not be impaired in any  material  respect at
                  the Effective Time; provided, however, that no action by BT or
                  its   Subsidiaries   with  respect  to  matters   specifically
                  addressed by any other  provision of this Section 4.2 shall be
                  deemed a breach of this  Section  4.2(a)  unless  such  action
                  would  constitute  a  breach  of one or  more  of  such  other
                  provisions.

                           (ii) BT shall  not,  and shall not  permit any of its
                  Subsidiaries  to,  (A)  enter  into any new  material  line of
                  business  or (B) incur or commit to any  capital  expenditures
                  other than  capital  expenditures  incurred or committed to in
                  the ordinary course of business  consistent with past practice
                  and which,  together  with all such  expenditures  incurred or
                  committed to during any fiscal year, are not in excess of 115%
                  of the aggregate amount of capital  expenditures  reflected in
                  BT's  capital  expenditure  budget for the  applicable  fiscal
                  year.

                  (b) Dividends;  Changes in Stock.  BT shall not, and shall not
         permit  any of its  Subsidiaries  to,  and shall not  propose  to,  (i)
         declare or pay any dividends on or make other  distributions in respect
         of any of its share capital, except (A) BT may continue the declaration
         and payment of regular  semiannual cash dividends in amounts consistent
         with past practice  (including  increases in such amounts in accordance
         with past  practice),  in each case with usual record and payment dates
         for such  dividends in  accordance  with BT's past  dividend  practice,
         provided that,  notwithstanding the exception in Section  4.2(b)(i)(A),
         BT shall in respect of the Second  Dividend  notify the LSE to mark the
         BT Ordinary Shares  "ex-dividend"  in the Stock Exchange Daily Official
         List on a date prior to the  Effective  Time,  (B)  dividends by wholly
         owned  Subsidiaries  of BT and (C) BT may  declare  and pay one or more
         special  dividends  in an  aggregate  amount  not to exceed  35p per BT
         Ordinary  Share (net),  (ii) split,  combine or  reclassify  any of its
         share  capital or issue or  authorize  or propose  the  issuance of any
         other  securities  in  respect  of, in lieu of or in  substitution  for
         shares, except for any such transaction by a wholly owned Subsidiary of
         BT which remains a wholly owned Subsidiary  after  consummation of such
         transaction,  or (iii)  repurchase,  redeem or  otherwise  acquire,  or
         permit any  Subsidiary  of BT to purchase  or  otherwise  acquire,  any
         shares  of its  capital  stock or any  securities  convertible  into or
         exercisable  for any shares of its capital  stock  except the  purchase
         from time to time by BT of BT Ordinary Shares in the ordinary course of
         business consistent with past practice in


<PAGE>


                                                        36

         connection  with  share  options,  share  incentive  schemes  or profit
         sharing schemes of BT.

                  (c) Issuance of Securities. BT shall not, and shall not permit
         any of its  Subsidiaries  to,  issue,  deliver or sell, or authorize or
         propose the issuance, delivery or sale of, any shares of any class, any
         BT Voting Debt or any securities  convertible  into or exercisable for,
         or any rights,  warrants  or options to acquire,  any such shares or BT
         Voting  Debt,  or enter into any  agreement  with respect to any of the
         foregoing,  other than (i) the issuance of BT Ordinary  Shares upon the
         exercise of stock options,  (ii) issuances by a wholly owned Subsidiary
         of BT of share capital to such Subsidiary's parent or to another wholly
         owned Subsidiary of BT and (iii) issuances of options,  rights or other
         awards pursuant to the BT benefit plans as in effect from time to time.

                  (d)  Governing  Documents.  Except to the extent  required  to
         comply with their respective obligations hereunder,  required by law or
         required by the rules and  regulations  of the LSE or the NYSE,  BT and
         its  Subsidiaries  shall not amend or propose to amend their respective
         memoranda and articles of association or other  governing  documents in
         any manner  which would be adverse (i) to the  interests  of MCI or the
         stockholders  of MCI,  unless such amendment is equally  adverse to the
         shareholders  of  BT  or  (ii)  to  MCI's  ability  to  consummate  the
         transactions contemplated hereby.

                  (e) No  Acquisitions.  Other than  acquisitions in existing or
         related  lines of  business  of BT the fair  market  value of the total
         consideration  (including the value of  indebtedness or other liability
         acquired  or  assumed)  for  which  does not  exceed  (pound)50,000,000
         individually or (pound)200,000,000 in the aggregate,  BT shall not, and
         shall  not  permit  any of its  Subsidiaries  to,  acquire  or agree to
         acquire  by  merging  or   consolidating   with,  or  by  purchasing  a
         substantial  equity interest in or a substantial  portion of the assets
         of,  or  by  any  other  manner,   any  business  or  any  corporation,
         partnership,  association  or other business  organization  or division
         thereof or otherwise acquire or agree to acquire any assets (other than
         the  acquisition of assets used in the operations of the business of BT
         and its Subsidiaries in the ordinary course);  provided,  however, that
         the  foregoing  shall not  prohibit  (x)  internal  reorganizations  or
         consolidations  involving  existing  Subsidiaries  of  BT  or  (y)  the
         creation of new  Subsidiaries  of BT  organized  to conduct or continue
         activities otherwise permitted by this Agreement.

                  (f) No Dispositions.  Other than (i) internal  reorganizations
         or  consolidations   involving   existing   Subsidiaries  of  BT,  (ii)
         dispositions  referred to in BT SEC Reports  filed prior to the date of
         this  Agreement  and (iii) as may be required by law in order to permit
         the consummation of the transactions contemplated hereby, BT shall not,
         and shall not permit any Subsidiary of BT to, sell, lease,  encumber or
         otherwise  dispose of, or agree to sell,  lease,  encumber or otherwise
         dispose of, any of


<PAGE>


                                                        37

         its assets  (including  capital stock of  Subsidiaries of BT) which are
         material, individually or in the aggregate, to BT.

                  (g)  Indebtedness.  BT shall not,  and shall not permit any of
         its  Subsidiaries to, (i) incur or suffer to exist any indebtedness for
         borrowed money or guarantee any such  indebtedness or issue or sell any
         debt securities or warrants or rights to acquire any debt securities of
         BT or any of its Subsidiaries or guarantee any debt securities of other
         Persons other than  indebtedness of BT or any Subsidiary of BT to BT or
         any wholly owned Subsidiary of BT and other than as permitted  pursuant
         to Section 4.2(g) of the BT Disclosure  Schedule,  (ii) make any loans,
         advances  or capital  contributions  to, or  investments  in, any other
         Person,  other  than  by BT or a  Subsidiary  of BT to or in BT or  any
         Subsidiary  of BT or  (iii)  pay,  discharge  or  satisfy  any  claims,
         liabilities or obligations (absolute,  accrued, asserted or unasserted,
         contingent  or  otherwise),  other than in the case of clauses (ii) and
         (iii), loans, advances, capital contributions,  investments,  payments,
         discharges  or  satisfactions  incurred or committed to in the ordinary
         course of business consistent with past practice.

                  (h) Benefit Plans. BT shall, to the extent permitted by law or
         regulations or any applicable confidentiality  agreement,  consult with
         MCI in advance with respect to any  proposed  material  changes in BT's
         benefits  plans,  and shall  consider  in good faith  MCI's  views with
         respect to the foregoing.

                  (i) Other  Actions.  BT shall not, and shall not permit any of
         its  Subsidiaries  to,  take  any  action  that  would,  or that  could
         reasonably be expected to, result in (i) any of the  representations or
         warranties of BT set forth in this  Agreement  that are qualified as to
         materiality  becoming  untrue,  (ii)  any of  such  representations  or
         warranties  that are not so qualified  becoming  untrue in any material
         respect or (iii) except as  otherwise  permitted by Section 5.7, any of
         the  conditions  to the  Merger  set  forth  in  Article  VI not  being
         satisfied.

                  (j)  Accounting  Methods;  Income  Tax  Elections.  Except  as
         disclosed in BT SEC Reports filed prior to the date of this  Agreement,
         or as  required  by a  Governmental  Entity,  BT shall not  change  its
         accounting  policies in effect at March 31, 1996, except as required or
         permitted  by changes in UK GAAP as  concurred  in by BT's  independent
         auditors.  BT shall not (i) change its fiscal  year  (unless  otherwise
         required by law) or (ii) make any material Tax elections, other than in
         the ordinary course of business consistent with past practice,  without
         consultation with MCI.

                  (k) Tax-Free Qualification. BT shall not, and shall not permit
         any of its  Subsidiaries  to,  take any action  that  would  prevent or
         impede  (i) the Merger  from  qualifying  as a tax-free  reorganization
         under  Section 368 of the Code or (ii) either party from  obtaining the
         Required Consents.



<PAGE>


                                                        38

                  (l) Certain Agreements. BT shall not, and shall not permit any
         of its  Subsidiaries  to, enter into any agreement or arrangement  that
         limits or  otherwise  restricts  BT or any of its  Subsidiaries  or any
         successor thereto from engaging or competing in any line of business or
         in any  geographic  area which would have a Material  Adverse Effect on
         BT.

                  (m) Certain  Arrangements.  BT shall take reasonable  steps to
         implement and maintain  arrangements under which holders of BT ADSs who
         satisfy the conditions for the  application of such  arrangements  will
         receive a Tax Treaty  Payment to which they are entitled  directly from
         BT rather than from the Inland Revenue at the same time as and together
         with the payment of the associated  cash dividend.  For the purposes of
         this  Section  4.2(m)  the Tax  Treaty  Payment is that part of the tax
         credit  attaching to the relevant  dividend  that would,  but for these
         arrangements,  be  reclaimed  by the  holder of BT ADSs from the United
         Kingdom  Inland  Revenue  under the income tax  convention  between the
         United States and the United Kingdom.

                  4.3. Advice of Changes;  Government Filings.  Each party shall
(a) confer on a regular and  frequent  basis with the other,  (b) report (to the
extent  permitted  by  law  or  regulation  or  any  applicable  confidentiality
agreement) on operational  matters and (c) promptly  advise the other orally and
in writing of (i) any  representation  or warranty  made by it contained in this
Agreement that is qualified as to materiality  becoming  untrue or inaccurate in
any  respect or any such  representation  or warranty  that is not so  qualified
becoming  untrue or inaccurate in any material  respect,  (ii) the failure by it
(A) to  comply  with or  satisfy  in any  respect  any  covenant,  condition  or
agreement  required to be complied with or satisfied by it under this  Agreement
that is  qualified  as to  materiality  or (B) to comply  with or satisfy in any
material  respect any covenant,  condition or agreement  required to be complied
with or  satisfied  by it under this  Agreement  that is not so  qualified as to
materiality  or (iii) any change,  event or  circumstance  that has had or would
have a Material Adverse Effect on such party;  provided,  however,  that no such
notification  shall  affect  the  representations,   warranties,   covenants  or
agreements of the parties or the  conditions to the  obligations  of the parties
under this Agreement.  MCI and BT shall file all reports required to be filed by
each of them  with the SEC (and  all  other  Governmental  Entities)  and  shall
announce or publish all information required to be announced or published by the
LSE  (including  pursuant to the Listing  Rules of the LSE)  between the date of
this Agreement and the Effective Time and shall (to the extent  permitted by law
or regulation or any applicable  confidentiality agreement) deliver to the other
party copies of all such reports,  announcements and publications promptly after
the same are filed, announced or published.  Subject to applicable laws relating
to the  exchange  of  information,  each of MCI and BT shall  have the  right to
review in advance,  and to the extent  practicable  each will  consult  with the
other, with respect to all the information  relating to the other party and each
of their respective Subsidiaries, which appears in any filings, announcements or
publications  made with, or written  materials  submitted to, any third party or
any Governmental Entity in connection with the transactions contemplated by this
Agreement.  In exercising the foregoing right, each of the parties hereto agrees
to act reasonably and as promptly as


<PAGE>


                                                        39

practicable.  Each party agrees that, to the extent practicable, it will consult
with the other party with respect to the  obtaining  of all  permits,  consents,
approvals  and  authorizations  of all third parties and  Governmental  Entities
necessary or advisable  to  consummate  the  transactions  contemplated  by this
Agreement  and each party will keep the other  party  apprised  of the status of
matters relating to completion of the transactions contemplated hereby.

                  4.4.  Transition  Planning.   Sir  Peter  Bonfield,  as  Chief
Executive  Officer of BT, and Gerald H. Taylor,  as  President  of MCI,  jointly
shall be responsible  for  coordinating  all aspects of transition  planning and
implementation  relating to the Merger and the other  transactions  contemplated
hereby. If either such person ceases to be Chief Executive Officer or President,
respectively,  of his company  for any reason,  such  person's  successor  shall
assume his  predecessor's  responsibilities  under this Section 4.4.  During the
period  between  the date of this  Agreement  and the  Effective  Time,  Messrs.
Bonfield and Taylor jointly shall (i) examine various alternatives regarding the
manner in which to best  organize and manage the  businesses of BT and MCI after
the Effective Time and (ii)  coordinate  policies and strategies with respect to
regulatory authorities and bodies, in all cases subject to applicable law.

                  4.5. Control of Other Party's  Business.  Nothing contained in
this Agreement shall give MCI,  directly or indirectly,  the right to control or
direct BT's operations  prior to the Effective Time.  Nothing  contained in this
Agreement shall give BT, directly or indirectly,  the right to control or direct
MCI's  operations prior to the Effective Time. Prior to the Effective Time, each
of MCI and BT shall  exercise,  consistent with the terms and conditions of this
Agreement, complete control and supervision over its respective operations.


                                    ARTICLE V

                              ADDITIONAL AGREEMENTS


     5.1.   Preparation  of  Disclosure   Documents;   MCI  Stockholder  and  BT
Shareholder Meetings.

                  (a)  As  soon  as  practicable  following  the  date  of  this
         Agreement, MCI and BT shall prepare the Proxy Statement/Prospectus. MCI
         shall, in cooperation with BT, file the Proxy Statement/Prospectus with
         the SEC as its preliminary Proxy Statement and BT shall, in cooperation
         with MCI,  prepare  and file  with the SEC the Form  F-4,  in which the
         Proxy  Statement/Prospectus  will be  included as BT's  prospectus.  If
         required  under the Exchange Act, BT, Merger Sub and MCI shall together
         prepare  and  file a  Transaction  Statement  on  Schedule  13E-3  (the
         "Schedule  13E-3")  under the Exchange Act at the time of the filing of
         the preliminary Proxy


<PAGE>


                                                        40

         Statement.  At the time of the filing of any amended  preliminary Proxy
         Statement  and at the  time  of the  filing  of the  Form  F-4  and any
         amendment  to the Form  F-4,  the  parties  shall  file with the SEC an
         appropriate  amendment  to the  Schedule  13E-3  which  includes  as an
         exhibit thereto and incorporates by reference such amended  preliminary
         Proxy Statement or such Proxy Statement/Prospectus, or any amendment or
         supplement thereto. Each of MCI and BT shall use all reasonable efforts
         to have the Form F-4 declared  effective  under the  Securities  Act as
         promptly  as  practicable  after  such  filing and to keep the Form F-4
         effective as long as is necessary to  consummate  the Merger.  BT shall
         also, as promptly as practicable,  use all reasonable  efforts to cause
         the ADR  Depositary  to file with the SEC a  registration  statement on
         Form F-6 (the "Form  F-6") with  respect to the BT ADRs to be issued in
         connection  with  the  Merger  under  the  Securities  Act  and use all
         reasonable  efforts to have the Form F-6 declared  effective as soon as
         practicable   after   such   filing.   MCI   shall   mail   the   Proxy
         Statement/Prospectus  to MCI's  stockholders as promptly as practicable
         after the Form F-4 is declared  effective under the Securities Act and,
         if necessary,  after the Proxy  Statement/Prospectus shall have been so
         mailed, promptly circulate amended,  supplemental or supplemented proxy
         material, and, if required in connection therewith,  resolicit proxies,
         it being  understood  that MCI shall not be  required to hold more than
         one meeting of stockholders.  BT shall also take any action (other than
         qualifying to do business in any jurisdiction in which BT is not now so
         qualified)  required to be taken  under any  applicable  United  States
         state securities laws in connection with the issuance of BT ADSs and BT
         ADRs in connection  with the Merger and under the MCI Benefit Plans and
         MCI shall furnish all information concerning MCI and the holders of MCI
         Common Stock as may be reasonably requested in connection with any such
         action.

                  (b)  Unless  otherwise  required  pursuant  to the  applicable
         fiduciary  duties of the Board of Directors of MCI to the  stockholders
         of MCI (as  determined  in good faith by the Board of  Directors of MCI
         based  upon the advice of outside  counsel)  (i) MCI shall,  as soon as
         practicable  following the date of this Agreement and the effectiveness
         of the Form F-4, duly call,  give notice of, convene and hold a meeting
         of its stockholders (the "MCI Stockholders Meeting") for the purpose of
         obtaining the Required MCI Votes with respect to this  Agreement,  (ii)
         the  Board  of  Directors  of MCI  shall  recommend  adoption  of  this
         Agreement  by the  Stockholders  of MCI and (iii)  MCI  shall  take all
         lawful action to solicit such adoption.

                  (c)  Unless  otherwise  required  pursuant  to the  applicable
         fiduciary duties of the Board of Directors of BT to the shareholders of
         BT (as  determined  in good faith by the Board of Directors of BT based
         upon the  advice  of  counsel),  (i) BT shall,  as soon as  practicable
         following the date of this Agreement, convene and hold a meeting of the
         holders of BT Ordinary  Shares (the "BT  Shareholder  Meeting") for the
         purpose of  obtaining  the Required BT Vote with respect to the Merger,
         the share repurchase  authorization referred to in Section 5.16 and the
         other transactions  contemplated hereby and (ii) the Board of Directors
         of BT shall recommend approval of the


<PAGE>


                                                        41

         Merger,  the share repurchase  authorization and the other transactions
         contemplated hereby.

                  (d) In  connection  with the BT  Shareholder  Meeting,  to the
         extent required by applicable law, (i) BT shall, as soon as practicable
         after the date of this  Agreement  and in  accordance  with the listing
         rules of the LSE,  prepare  and submit to the LSE for  approval  the BT
         Disclosure Document,  and shall use all reasonable efforts to have such
         document formally approved by the LSE and shall thereafter  publish the
         BT  Disclosure  Document  and  mail  the  same to its  shareholders  in
         compliance with all legal requirements applicable to the BT Shareholder
         Meeting and the listing rules of the LSE and (ii) if  necessary,  after
         the BT  Disclosure  Document  has been so  posted,  promptly  circulate
         amended,  supplemental  or  supplemented  materials and, if required in
         connection  therewith,  resolicit  votes,  it being  understood that BT
         shall not be required to hold more than one meeting of shareholders.

                  (e) Except as required by law, no amendment or  supplement  to
         the Proxy  Statement/Prospectus or the Form F-4 or, if applicable,  the
         Schedule  13E-3 shall be made by BT or MCI without the  approval of the
         other party  (which  shall not be  unreasonably  withheld).  Each party
         shall  advise  the  other  party,  promptly  after it  receives  notice
         thereof,  of the time  when the Form F-4 has  become  effective  or any
         supplement  or  amendment  has been filed,  of the issuance of any stop
         order,  of the  suspension of the  qualification  of BT ADSs or BT ADRs
         issuable  in  connection  with the Merger for  offering  or sale in any
         jurisdiction,  or of any request by the SEC or the LSE for amendment of
         the Proxy  Statement/Prospectus or the Form F-4 or comments thereon and
         responses  thereto  or  requests  by the SEC or the LSE for  additional
         information.

                  5.2.     BT Board of Directors; Officers; Headquarters.

                  (a) BT shall take all  necessary  action to  reconstitute  the
         Board of Directors of BT as of the Effective  Time in  accordance  with
         Exhibit 5.2(a).

     (b) BT shall take all necessary  action to cause Sir Iain Vallance and Bert
C. Roberts,  Jr. to be appointed  Co-Chairmen of BT as of the Effective Time and
to amend the Articles of Association of BT to provide for Co-Chairmen.

     (c) BT will have,  after the  Closing,  United  Kingdom  and United  States
headquarters.

                  (d) BT shall take all reasonable  steps to ensure that,  after
         the Effective  Time, five out of the first ten meetings of the Board of
         Directors  of BT each year will be held in the United  Kingdom with Sir
         Iain Vallance (or his  successor)  acting as the Chairman and presiding
         at such five meetings and the  remaining  five meetings will be held in
         the United States with Bert C. Roberts,  Jr. (or his successor)  acting
         as the


<PAGE>


                                                        42

         Chairman  and  presiding  at such  five  meetings,  and any  additional
         meetings of the Board of  Directors of BT each year will be held in the
         United Kingdom with Sir Iain Vallance (or his successor)  acting as the
         Chairman and presiding at such additional meetings.

                  (e) BT shall take reasonable steps after the Effective Time to
         enable  United  States  holders  of BT  ADSs  to  attend  and,  at  the
         invitation  of the  Chairman,  speak  (but not  vote) by means of video
         conference,   conference  telephone  or  other  similar  communications
         equipment, at any shareholder meeting of BT held in the United Kingdom;
         provided,  however, that (i) in no event will the failure to so provide
         such United  States  holders with such  opportunity  or any  mechanical
         failure of the video conference,  conference telephone or other similar
         communication  equipment  during  the course of a  shareholder  meeting
         affect the  validity of such  shareholder  meeting or any action  taken
         pursuant thereto and (ii) under no circumstances  will the provision of
         such  opportunity for such attendance by any United States holder of BT
         ADSs (in his capacity as a holder of BT ADSs or in any other  capacity)
         be taken to  constitute  an  additional  place for the  holding  of any
         General Meeting with the meaning of Article  62(c)(ii) of BT's Articles
         of Association.

                  5.3. Access to Information. Upon reasonable notice, MCI and BT
shall each (and shall cause each of their respective  Subsidiaries to) afford to
the officers,  employees,  accountants,  counsel,  financial  advisors and other
representatives  of the other  reasonable  access during normal  business hours,
during the period prior to the  Effective  Time, to all its  properties,  books,
contracts,  commitments and records and, during such period,  each of MCI and BT
shall  (and  shall  cause  each of their  respective  Subsidiaries  to)  furnish
promptly  to the  other  (a) a  copy  of  each  report,  schedule,  registration
statement  and other  document  filed,  published,  announced  or received by it
during such period pursuant to the  requirements of Federal or state  securities
laws, the LSE or the FSA, as applicable  (other than reports or documents  which
such party is not permitted to disclose under applicable law) and (b) consistent
with its legal  obligations,  all other  information  concerning  its  business,
properties and personnel as such other party may reasonably  request;  provided,
however, that BT or MCI may restrict the foregoing access to the extent that (i)
a Governmental Entity requires such party or any of its Subsidiaries to restrict
access to any properties or information  reasonably related to any such contract
on the  basis of  applicable  laws and  regulations  with  respect  to  national
security matters or (ii) any law, treaty, rule or regulation of any Governmental
Entity  applicable  to such party  requires  such party or its  Subsidiaries  to
restrict access to any properties or information. The parties will hold any such
information  which is non-public in confidence to the extent required by, and in
accordance  with, the provisions of the letter dated October 4, 1996 between MCI
and BT (the "Confidentiality  Agreement"). Any investigation by either BT or MCI
shall not affect the representations and warranties of the other.

     5.4.  Approvals and Consents;  Cooperation.  (a) MCI and BT shall cooperate
with each other and use (and shall cause their  respective  Subsidiaries to use)
all

<PAGE>


                                                        43

reasonable  best  efforts  to take or cause to be taken all  actions,  and do or
cause to be done all things, necessary,  proper or advisable on their part under
this Agreement and  applicable  laws to consummate and make effective the Merger
and  the  other   transactions   contemplated  by  this  Agreement  as  soon  as
practicable,  including (i) preparing and filing as promptly as practicable  all
documentation to effect all necessary applications, notices, petitions, filings,
tax ruling requests and other documents and to obtain as promptly as practicable
all consents, waivers, licenses, orders, registrations,  approvals, permits, tax
rulings and authorizations  necessary or advisable to be obtained from any third
party and/or any Governmental Entity in order to consummate the Merger or any of
the other  transactions  contemplated  by this  Agreement  and (ii)  taking  all
reasonable  steps as may be  necessary  to obtain  all such  consents,  waivers,
licenses,  registrations,  permits,  authorizations,  tax  rulings,  orders  and
approvals. Without limiting the generality of the foregoing, MCI and BT agree to
make all necessary filings in connection with the Required Regulatory  Approvals
as  promptly as  practicable  after the date of this  Agreement,  and to use all
reasonable  best  efforts to furnish or cause to be  furnished,  as  promptly as
practicable,  all  information  and  documents  requested  with  respect to such
Required Regulatory  Approvals and shall otherwise cooperate with the applicable
Governmental Entity in order to obtain any Required  Regulatory  Approvals in as
expeditious  a manner as possible.  Each of MCI and BT shall use all  reasonable
best efforts to resolve such objections,  if any, as any Governmental Entity may
assert with respect to this Agreement and the transactions  contemplated  hereby
in connection with the Required Regulatory  Approvals.  In the event that a suit
is instituted by a Person or Governmental  Entity challenging this Agreement and
the  transactions  contemplated  hereby as violative of applicable  antitrust or
competition  laws or the  Communications  Act,  each of MCI and BT shall use its
reasonable best efforts to resist or resolve such suit. Notwithstanding anything
to the contrary in this Section 5.4(a), (i) neither MCI nor BT shall be required
to agree to the imposition of a Combined Company Burdensome Condition,  (ii) MCI
shall not agree to the  imposition of an MCI Burdensome  Condition  without BT's
prior  written  consent and (iii) BT shall not agree to the  imposition  of a BT
Burdensome Condition without MCI's prior written consent.

                  (b) MCI and BT each shall, upon request by the other,  furnish
the other with all information  concerning itself, its Subsidiaries,  directors,
officers and  stockholders and such other matters as may reasonably be necessary
or advisable in connection  with the BT Disclosure  Document,  the Form F-4, the
Form F-6 and the Proxy  Statement/Prospectus  and, if  applicable,  the Schedule
13E-3 (collectively, the "Disclosure Documents") or any other statement, filing,
tax ruling request, notice or application made by or on behalf of MCI, BT or any
of their  respective  Subsidiaries  to any third party  and/or any  Governmental
Entity in connection with the Merger or the other  transactions  contemplated by
this Agreement.

     5.5.  Affiliates' and Auditors' Letters. (a) Prior to the Closing Date, MCI
shall deliver to BT a letter identifying all Persons who are,  immediately prior
to the Effective  Time, Rule 145 Affiliates of MCI. MCI shall use all reasonable
efforts to cause each such

<PAGE>


                                                        44

Person to deliver to BT on or prior to the Closing  Date a written  agreement in
the form customarily obtained from such affiliates for purposes of Rule 145.

                  (b) MCI and BT each shall use all reasonable  efforts to cause
to be delivered to the other party and such other party's  directors a letter of
its  independent  auditors,  dated the date on which  the Form F-4 shall  become
effective, and addressed to the other party and such other party's directors, in
form and  substance  customary for "comfort"  letters  delivered by  independent
public  accountants in connection with  registration  statements  similar to the
Form F-4.

                  5.6. Stock  Exchange  Listings.  (a) BT shall,  as promptly as
practicable, prepare and submit to the LSE a listing application covering the BT
Ordinary Shares to be represented by the BT ADSs to be issued in the Merger, and
shall  use all  reasonable  efforts  to  obtain,  prior to the  Effective  Time,
agreement  by the LSE for the  admission  of  such  BT  Ordinary  Shares  to the
Official List of the London Stock Exchange, and MCI shall cooperate with BT with
respect to such listing.

                  (b) BT shall, if necessary, promptly prepare and submit to the
NYSE or NASDAQ (as shall be agreed  between the parties  prior to the Closing) a
listing  application  covering the BT ADSs to be issued in the Merger, and shall
use all reasonable efforts to obtain,  prior to the Effective Time, approval for
the listing of such BT ADSs,  subject to official  notice of  issuance,  and MCI
shall cooperate with BT with respect to such listing.

                  5.7.  Acquisition  Proposals.  (a) MCI and BT each agrees that
neither it nor any of its  Subsidiaries nor any of the officers and directors of
it or its Subsidiaries  shall, and that it shall direct and use its best efforts
to  cause  its and  its  Subsidiaries'  employees,  agents  and  representatives
(including any investment banker,  attorney or accountant  retained by it or any
of  its  Subsidiaries)  not  to,  directly  or  indirectly,  initiate,  solicit,
encourage or otherwise facilitate  (including by way of furnishing  information)
any inquiries or the making of any proposal,  or offer with respect to a merger,
reorganization,    share   exchange,   consolidation,    business   combination,
recapitalization,  liquidation, dissolution or similar transaction involving, or
any purchase or sale of all or any  significant  portion of the assets or 10% or
more of the equity  securities  of, it or any of its  Subsidiaries  that, in any
such case,  could reasonably be expected to interfere with the completion of the
Merger  or the  other  transactions  contemplated  by this  Agreement  (any such
proposal or offer being hereinafter  referred to as an "Acquisition  Proposal").
MCI and BT each further agrees that neither it nor any of its  Subsidiaries  nor
any of the officers and directors of it or its  Subsidiaries  shall, and that it
shall  direct  and use its  best  efforts  to  cause  its and its  Subsidiaries'
employees, agents and representatives (including any investment banker, attorney
or accountant  retained by it or any of its  Subsidiaries)  not to,  directly or
indirectly,  have any discussion with or provide any confidential information or
data  to any  Person  relating  to an  Acquisition  Proposal  or  engage  in any
negotiations  concerning an Acquisition  Proposal,  or otherwise  facilitate any
effort or attempt to make or  implement  an  Acquisition  Proposal  or accept an
Acquisition  Proposal;   provided,  however,  that  nothing  contained  in  this
Agreement shall


<PAGE>


                                                        45

prevent  either MCI or BT or its Board of Directors from (A) complying with Rule
14e-2  promulgated  under the Exchange Act or complying  with the City Code,  as
applicable,  with  regard  to an  Acquisition  Proposal;  (B)  engaging  in  any
discussions or negotiations with, or providing any information to, any Person in
response to an unsolicited  bona fide written  Acquisition  Proposal by any such
Person;  or (C) recommending  such an unsolicited bona fide written  Acquisition
Proposal  to the  stockholders  of MCI or BT, as the case may be, if and only to
the extent  that,  in any such case as is referred to in clause (B) or (C),  (i)
the Board of Directors of MCI or BT, as the case may be, concludes in good faith
(after consultation with its financial advisors) that such Acquisition  Proposal
is  reasonably  capable  of being  completed,  taking  into  account  all legal,
financial,  regulatory  and other  aspects of the proposal and the Person making
the proposal, and would, if consummated,  result in a transaction more favorable
to  MCI's  or BT's  stockholders,  as the  case  may be,  from a  financial  and
strategic point of view than the transaction contemplated by this Agreement (any
such more favorable  Acquisition Proposal being referred to in this Agreement as
a "Superior  Proposal"),  (ii) the Board of  Directors of MCI or BT, as the case
may be, determines in good faith after consultation with legal counsel that such
action is necessary  for its Board of  Directors  to act in a manner  consistent
with its fiduciary  duties under  applicable  law,  (iii) prior to providing any
information or data to any Person in connection with an Acquisition  Proposal by
any such Person,  such Board of Directors  receives from such Person an executed
confidentiality  agreement on terms substantially  similar to those contained in
the  confidentiality  agreement  previously  entered  into between BT and MCI in
connection  with their  consideration  of the Merger and (iv) prior to providing
any  information  or  data  to  any  Person  or  entering  into  discussions  or
negotiations  with any Person,  the Board of Directors of MCI or BT, as the case
may be, notifies the other party,  immediately of such  inquiries,  proposals or
offers received by, any such information requested from, or any such discussions
or  negotiations   sought  to  be  initiated  or  continued  with,  any  of  its
representatives  indicating,  in connection  with such notice,  the name of such
Person and the terms and conditions of any proposals or offers.  MCI and BT each
agrees that it will  immediately  cease and cause to be terminated  any existing
activities,  discussions or negotiations with any parties  conducted  heretofore
with respect to any  Acquisition  Proposal.  MCI and BT each agrees that it will
take the necessary steps to promptly inform the individuals or entities referred
to in the first sentence  hereof of the  obligations  undertaken in this Section
5.7. MCI and BT each agrees that it shall keep the other informed,  on a current
basis, of the status and terms of any such proposals or offers and the status of
any such discussions or negotiations.

                  (b)  Except in  connection  with any  potential  change in the
terms of this Agreement in response to any Acquisition  Proposal as contemplated
by  Section  5.7(a)  and  Section  7.1(f),  neither  MCI  nor BT will  take  any
initiatives  involving the other party that would  otherwise  require such other
party to make a public  announcement,  make any public  comment or proposal with
respect to any Acquisition  Proposal with respect to such other party,  become a
member of a "group"  within the meaning of Section  13(d) of the  Exchange  Act,
enter into any discussions, negotiations, arrangements or understanding with any
third party with respect to any of the foregoing or otherwise seek to control or
influence the other party, in all cases except as expressly contemplated by this
Agreement or, in the case of BT,


<PAGE>


                                                        46

the  Investment  Agreement.  MCI and BT agree  that each will  notify  the other
immediately  if any inquiries or proposals are received by, any  information  is
requested from, or any negotiations or discussions are sought to be initiated or
continued  with,  either  MCI or BT or any of  their  respective  affiliates  or
representatives  regarding any  Acquisition  Proposal with respect to such other
party.

                  (c) BT agrees that,  while this  Agreement  remains in effect,
neither it nor any of its  Subsidiaries nor any of the officers and directors of
it or its Subsidiaries  shall, and that it shall direct and use its best efforts
to  cause  its and  its  Subsidiaries'  employees,  agents  and  representatives
(including any investment banker,  attorney or accountant  retained by it or any
of its  Subsidiaries)  not to, (i) directly or  indirectly,  initiate,  solicit,
encourage or otherwise facilitate any inquiries or the making of any proposal or
offer with  respect to the  purchase or sale of any shares of MCI Class A Common
Stock owned by BT or any of its Subsidiaries or (ii) sell,  transfer,  pledge or
assign,  or grant any proxy  with  respect  to, any shares of MCI Class A Common
Stock owned by BT or any of its Subsidiaries.

                  (d) BT agrees that, while this Agreement remains in effect, at
any meeting of the holders of shares of MCI Common  Stock at which BT shall have
the right to vote its  shares of MCI Class A Common  Stock or at any  meeting of
the  holders  of shares  of MCI  Class A Common  Stock,  however  called,  or in
connection with any written consent of the holders of shares of MCI Common Stock
or MCI Class A Common Stock,  BT shall vote (or cause to be voted) the shares of
MCI Class A Common  Stock held by it, to the  extent  voting  rights  exist with
respect  to the  proposals  to be  acted  upon,  in favor  of  adoption  of this
Agreement and approval of the other transactions contemplated by this Agreement.

                  5.8.  Stock  Options  and Other  Stock  Plans.  (a) During the
period from the date of this  Agreement to the Effective  Time, MCI may grant to
certain of its  employees,  pursuant to the MCI 1989 Stock Option  Plan,  Senior
Retention  ISUs,  1997 ISUs and 1997  Options  (as each such term is  defined in
Annex A hereto) substantially on the terms and conditions described in Annexes A
and B hereto. MCI and BT will discuss any  equity-related  award to be issued by
MCI during the period from the date of this Agreement to the Effective Time that
affects employees at the level of vice president and above and is significant in
the context of such employee's compensation.

                  (b) On or prior to the  Effective  Time,  MCI  shall  take all
action  necessary  to cause each option to purchase  shares of MCI Common  Stock
(each, an "MCI Stock Option") that was granted  pursuant to the MCI Stock Option
Plans  prior  to the  date of  this  Agreement  and  which  remains  outstanding
immediately  prior to the  Effective  Time to be  immediately  vested  and fully
exercisable  immediately  prior to the Effective Time (it being  understood that
MCI and BT will develop a mechanism to permit any such accelerated  option to be
exercised  immediately prior to the Effective Time so as to enable the holder to
receive the Merger  Consideration with respect to the underlying option shares).
Each MCI Stock Option  (including  each 1997 Option) which is outstanding at the
Effective  Time shall be  converted,  at the Effective  Time,  into an option to
acquire, on the same terms and conditions


<PAGE>


                                                        47

as were applicable under the MCI Stock Option Plans (as modified by this Section
5.8 and Annex A hereto),  that number of BT ADSs  determined by multiplying  the
number of shares of MCI Common  Stock  subject  to such MCI Stock  Option by the
Conversion Ratio,  rounded,  if necessary,  up to the nearest whole BT ADS, at a
price per share equal to (y) the aggregate  exercise price for the shares of MCI
Common Stock  subject to such MCI Stock  Option  divided by (z) the number of BT
ADSs deemed to be subject to such MCI Stock Option;  provided,  however, that in
the case of any MCI Stock  Option to which  section  421 of the Code  applies by
reason of its qualification under section 422 of the Code, the option price, the
number of shares subject to such option and the terms and conditions of exercise
of such option shall be determined in a manner  consistent with the requirements
of section 424(a) of the Code. For purposes of this Section 5.8, the "Conversion
Ratio"  means the sum of (i) 0.54 and (ii) the quotient  determined  by dividing
the amount of the Cash  Consideration by the average of the last sales prices on
the  NYSE  Composite  Transaction  Tape  of the BT  ADSs  on  each  of the  five
consecutive trading days ending on the last trading day immediately prior to the
day on which the Effective Time occurs.

                  (c) Each  option to acquire a BT ADS which has been  converted
from an MCI Stock  Option  pursuant  to the  terms of  Section  5.8(b)  shall be
amended as of the  Effective  Time to provide  for the  payment  (or, in certain
cases,  elective  deferral) of dividend  equivalents  equal to the amount of any
dividends  that  would  have  been  paid to the  holder  thereof  following  the
Effective  Time had the BT ADSs  underlying  such  options  been  delivered  and
outstanding on the applicable dividend record date; provided,  however, that any
such dividend equivalents shall be credited to a bookkeeping account in the name
of the option holder and shall be paid to such option  holder (with  interest at
the prime rate as  published  by Chase  Manhattan  Bank,  N.A.) when the related
option is  exercised  (or, if elected by such option  holder,  further  deferred
under the  terms of MCI's  deferred  compensation  program);  provided  further,
however,  that  any  such  dividend  equivalents  that  are  credited  to such a
bookkeeping account in respect of any option that is not subsequently  exercised
shall  be  forfeited  upon  the  expiration  or  forfeiture  of such  option  in
accordance with its terms.

                  (d) Each holder of a restricted  share of MCI Common Stock (an
"MCI  Restricted  Share") issued pursuant to the MCI Stock Option Plans shall be
offered,  prior to the  Effective  Time,  the  opportunity  to convert  such MCI
Restricted  Share  into  an  incentive  stock  unit  (a  "Converted  ISU")  that
represents a  contractual  right to receive one share of MCI Common Stock on the
terms and conditions specified in Annex B hereto,  subject to the same terms and
conditions as were applicable to the MCI Restricted Share  immediately  prior to
the  Effective  Time (as modified by this Section 5.8 and Annex B hereto).  Each
holder of an MCI Restricted Share that has not been converted in accordance with
the terms of the  previous  sentence  shall be entitled  to  receive,  as of the
Effective Time, for each Restricted Share held by such holder  immediately prior
to the  Effective  Time,  (i)  0.54  restricted  BT ADSs on the same  terms  and
conditions  applicable to the MCI  Restricted  Shares  immediately  prior to the
Effective Time (as modified by this Section 5.8) and (ii) the Cash Consideration
which shall be paid promptly after the Effective Time.


<PAGE>


                                                        48


                  (e) Effective as of the Effective  Time,  each  Converted ISU,
Senior Retention ISU and 1997 ISU outstanding immediately prior to the Effective
Time  (collectively,  the "MCI ISUs") shall be  converted  into (i) an incentive
stock unit to receive 0.54 BT ADSs, on the same terms and conditions  applicable
to the MCI ISUs  immediately  prior to the  Effective  Time (as modified by this
Section 5.8 and Annex B hereto) and (ii) the Cash  Consideration  which shall be
paid promptly after the Effective Time.

                  (f) As soon as practicable  after the Effective Time, BT shall
deliver to the holders of MCI Stock Options,  MCI Restricted Shares and MCI ISUs
(collectively, the "MCI Awards") appropriate notices setting forth such holders'
rights pursuant to the applicable MCI Benefit Plans and the agreements  pursuant
to which such MCI Awards were issued and the agreements evidencing the grants of
such MCI Awards  shall  continue in effect on the same terms and  conditions  as
specified  with  respect  to such MCI  Awards  as of the  Effective  Time in the
applicable  MCI  Benefit  Plan  governing  such  MCI  Awards   (subject  to  the
adjustments  and  amendments  required  by this  Section 5.8 and Annexes A and B
hereto,  and after giving  effect to the Merger and the  conversion as set forth
above). It is the intention of the parties that, subject to applicable law, each
MCI Stock Option which  qualified as an incentive stock option under section 422
of the Code prior to the  Effective  Time  continue  to qualify as an  incentive
stock option of BT after the Effective Time.

                  (g) BT  shall  take all  corporate  action  necessary  to have
available for delivery a sufficient number of BT Ordinary Shares  represented by
BT ADSs to be delivered upon exercise, vesting or payment, as applicable, of the
MCI Awards converted in accordance with this Section 5.8. As soon as practicable
after the Effective Time, BT shall file a registration statement on Form S-8 (or
any successor or other appropriate form) with respect to the delivery of such BT
ADSs and  shall use its best  efforts  to  maintain  the  effectiveness  of such
registration  statement or  registration  statements  (and  maintain the current
status of the prospectus or prospectuses  contained therein) for so long as such
MCI Awards remain outstanding.

                  (h) Prior to the Effective Time, BT and MCI shall cooperate to
take all such other  action as may be  necessary  to carry out the terms of this
Section 5.8.

                  5.9. Employment Agreements; Employee Benefits Matters. (a) MCI
has entered into employment  agreements (the "Employment  Agreements")  with the
eight senior  executives  whose names have been provided to BT prior to the date
of this  Agreement,  and in the forms  provided  to BT prior to the date of this
Agreement. Promptly after the date of this Agreement, BT and MCI shall cooperate
in good  faith to  resolve  any tax  issues  that may arise  with  regard to the
identity of the employer for purposes of the  Employment  Agreements.  MCI shall
use its reasonable  efforts in good faith to amend the Employment  Agreements to
reflect the foregoing resolution.



<PAGE>


                                                        49

                  (b)  Annexes  A and B  hereto  set  forth  certain  additional
agreements  among the parties hereto with respect to employee  benefits  matters
and are hereby incorporated herein by reference.

                  5.10.  Fees  and  Expenses.  Whether  or  not  the  Merger  is
consummated,  all Expenses  incurred in connection  with this  Agreement and the
transactions  contemplated  hereby  shall be paid by the  party  incurring  such
Expenses,  except (a) if the Merger is  consummated,  the Surviving  Corporation
shall pay, or cause to be paid,  any and all property or transfer  taxes imposed
on MCI or its  Subsidiaries  and any real  property  transfer tax imposed on any
holder of shares of capital stock of MCI resulting from the Merger, (b) Expenses
incurred  in  connection  with  filing,  printing  and  mailing  the  Disclosure
Documents  and with  listing on the NYSE the BT ADSs into which MCI Common Stock
shall be converted  shall be shared equally by BT and MCI and (c) as provided in
Section 7.2. As used in this Agreement,  "Expenses"  includes all  out-of-pocket
expenses  (including,  without  limitation,  all fees and  expenses  of counsel,
accountants,  investment bankers,  experts and consultants to a party hereto and
its  affiliates)  incurred  by a party or on its  behalf in  connection  with or
related  to  the   authorization,   preparation,   negotiation,   execution  and
performance  of  this  Agreement  and  the  transactions   contemplated  hereby,
including  the  preparation,  printing,  filing and  mailing  of the  Disclosure
Documents and the  solicitation  of stockholder  approvals and all other matters
related to the transactions contemplated hereby.

                  5.11. Indemnification; Directors' and Officers' Insurance. The
Surviving Corporation shall cause to be maintained in effect (i) for a period of
six  years  after  the  Effective   Time,  the  current   provisions   regarding
indemnification  of officers  and  directors  contained  in the  certificate  of
incorporation and by-laws of MCI and (ii) for a period of six years, the current
policies of directors' and officers' liability insurance and fiduciary liability
insurance  maintained  by MCI  (provided  that  the  Surviving  Corporation  may
substitute  therefor  policies  of  at  least  the  same  coverage  and  amounts
containing  terms  and  conditions   which  are,  in  the  aggregate,   no  less
advantageous to the insured) with respect to claims arising from facts or events
that occurred on or before the Effective  Time;  provided,  however,  that in no
event shall the Surviving  Corporation  be required to expend in any one year an
amount in excess of 200% of the annual  premiums  currently paid by MCI for such
insurance; and, provided, further, that if the annual premiums of such insurance
coverage  exceed such amount,  the Surviving  Corporation  shall be obligated to
obtain a policy with the greatest  coverage  available  for a cost not exceeding
such amount.

                  5.12.  Rights  Agreement.  The Board of Directors of MCI shall
take all  further  action (in  addition to that  referred to in Section  3.1(m))
necessary  (including  redeeming the Rights  immediately  prior to the Effective
Time  or  amending  the  Rights   Agreement)  in  order  to  render  the  Rights
inapplicable  to the  Merger  and the other  transactions  contemplated  by this
Agreement.

     5.13.  Interim  Cooperative  Arrangements.  BT and  MCI  agree  to use  all
reasonable   efforts  to  negotiate  and  implement  such  interim   cooperative
arrangements as may

<PAGE>


                                                        50

be appropriate to enable the parties, prior to Closing, to realize to the extent
practicable the benefits anticipated from the Merger.

                  5.14.  Public   Announcements.   MCI  and  BT  shall  use  all
reasonable efforts to develop a joint  communications  plan and each party shall
use all  reasonable  efforts  (i) to ensure  that all press  releases  and other
public statements with respect to the transactions  contemplated hereby shall be
consistent  with such  joint  communications  plan,  and (ii)  unless  otherwise
required by applicable law or by obligations  pursuant to any listing  agreement
with or rules of any  securities  exchange,  to consult  with each other  before
issuing any press release or otherwise  making any public statement with respect
to this Agreement or the transactions contemplated hereby.

                  5.15. Investment Agreement. MCI hereby waives compliance by BT
with the  provisions  of Section 7 of the  Investment  Agreement  as required in
order to  permit  the  consummation  of the  transactions  contemplated  by this
Agreement.  Immediately  prior to the Effective  Time, the Investment  Agreement
shall be deemed  to have  been  amended  to  delete  Section  7  thereof  in its
entirety.  BT hereby waives  compliance  by MCI with the  provisions of Sections
9.4(a)  and  9.5(d)  of the  Investment  Agreement  (i)  from  the  date of this
Agreement  until  termination of this Agreement in accordance with its terms and
(ii) for such period of time after a  termination  of this  Agreement  by MCI in
accordance  with the terms of Section  7.1(f) as would be  required  in order to
permit the consummation of the Superior Transaction proposed at the time of such
termination;  provided, however, that the waiver of compliance contained in this
sentence shall not be effective if MCI is in breach of this Agreement. Except as
provided in this Section 5.15,  the  Investment  Agreement  shall remain in full
force and effect,  and the parties shall  continue to abide by their  respective
covenants and other obligations thereunder.

                  5.16.  Repurchase  Authorization.  BT shall  seek  shareholder
approval at the BT Shareholder Meeting of a resolution empowering BT to purchase
from time to time up to  approximately  990,000,000 BT Ordinary Shares following
the  Effective  Time in  accordance  with  Section  166  Companies  Act. BT will
consider  favourably  making such  purchases  following the  Effective  Time, as
market conditions warrant.

     5.17. Holding Company Structure;  Name. The parties' intent is to create to
the extent  practicable  at or following  the Effective  Time a holding  company
structure for the combined businesses of BT and MCI. In furtherance thereof: 

   (a) As of the  Effective  Time,  BT's name will be changed to Concert plc; 

   (b) As of the Effective  Time, BT will form a wholly owned  subsidiary to be
   named British Telecommunications  plc; and 

   (c) Pending the Effective  Time,  the parties shall use all  reasonable 
   efforts  to cause the  respective local and long distance businesses of BT
   and MCI to be

<PAGE>


                                                        51

         operated or managed  following the Effective Time or as soon thereafter
         as  practicable  through  wholly owned United Kingdom and United States
         subsidiaries;  provided  that,  with  respect  to  the  United  Kingdom
         business,   BT  is  satisfied  in  its   reasonable   judgment,   after
         consultation  with MCI,  that  there are no adverse  tax or  regulatory
         consequences (except for immaterial consequences).

                  5.18.  Global  Activities.  MCI  and  BT  hereby  agree  that,
effective  as of the date of this  Agreement  and  pending  the  Closing,  MCI's
Chairman of the Board of Directors,  on behalf of the boards of directors of MCI
and BT, will assume management and oversight of the integration  planning of the
two companies' global  activities to the extent  permissible under antitrust and
regulatory laws.



                                   ARTICLE VI

                              CONDITIONS PRECEDENT


     6.1.  Conditions  to Each  Party's  Obligation  to Effect the  Merger.  The
obligations  of MCI,  BT and Merger Sub to effect the Merger are  subject to the
satisfaction  or  waiver  on or  prior  to the  Closing  Date  of the  following
conditions:
                  (a)  Stockholder  Approvals.  (i) MCI shall have  obtained all
         approvals  of holders of shares of capital  stock of MCI  necessary  to
         approve this  Agreement and all the  transactions  contemplated  hereby
         (including the Merger) and (ii) BT shall have obtained all approvals of
         holders of share capital of BT necessary to approve this  Agreement and
         all the transactions  contemplated hereby (including the Merger and the
         share repurchase authorization referred to in Section 5.16).

                  (b) Stock  Exchange  Listings.  The LSE shall  have  agreed to
         admit to the Official List  (subject to allotment)  the new BT Ordinary
         Shares to be issued in  connection  with the Merger and such  agreement
         shall  not have  been  withdrawn,  and the BT ADSs to be  issued in the
         Merger shall have been  authorized for listing on the NYSE,  subject to
         official notice of issuance.

                  (c) HSR Act. The waiting  period (and any  extension  thereof)
         applicable  to the Merger under the HSR Act shall have been  terminated
         or shall have expired.

                  (d) FCC Order.  If then legally  required,  an FCC Order shall
         have  been  obtained,  which has not been  revoked  or stayed as of the
         Closing Date.



<PAGE>


                                                        52

                  (e) Exon-Florio.  Review and  investigation  under Exon-Florio
         shall have been terminated and the President shall have taken no action
         authorized under Exon-Florio.

                  (f) Securities  Law. The Form F-4 filed by BT and the Form F-6
         filed by the ADR  Depositary  shall  have  become  effective  under the
         Securities Act and no stop order  suspending the  effectiveness of such
         registration  statements  shall  have  been  issued  by the  SEC and no
         proceeding  for that  purpose  shall then be  threatened  by the SEC or
         shall have been  initiated by the SEC and not  concluded or  withdrawn,
         and all state  securities  or "blue sky"  authorizations  necessary  to
         carry out the transactions contemplated hereby shall have been obtained
         and be in full force and effect.

                  (g) No  Injunctions or  Restraints,  Illegality.  No temporary
         restraining order,  preliminary or permanent  injunction or other order
         issued  by  a  court  or  other   Governmental   Entity  of   competent
         jurisdiction  shall be in effect  and have the  effect  of  making  the
         Merger  illegal or otherwise  prohibiting  consummation  of the Merger;
         provided, however, that the provisions of this Section 6.1(g) shall not
         be  available  to any party whose  failure to fulfill  its  obligations
         pursuant  to  Section  5.4 shall  have been the cause of, or shall have
         resulted in, such order or injunction.

                  (h) No  Litigation.  There  shall not be  pending  or  overtly
         threatened  any suit,  action,  investigation  or proceeding to which a
         Governmental  Entity is a party (i) seeking to restrain or prohibit the
         consummation   of  the   Merger  or  any  of  the  other   transactions
         contemplated  by this  Agreement or seeking to obtain from MCI or BT or
         any of their  respective  Subsidiaries any damages that are material in
         relation  to MCI and its  Subsidiaries  taken  as a whole or BT and its
         Subsidiaries, taken as a whole, as applicable, (ii) seeking to prohibit
         or  limit  the  ownership  or  operation  by MCI or BT or any of  their
         respective  Subsidiaries  of any  material  portion of the  business or
         assets  of MCI and its  Subsidiaries  taken as a  whole,  or BT and its
         Subsidiaries  taken as a whole,  or seeking to require MCI or BT or any
         of their  respective  Subsidiaries  to dispose of or hold  separate any
         material  portion of the business or assets of MCI and its Subsidiaries
         taken as a whole  or BT and its  Subsidiaries  taken  as a whole,  as a
         result of the Merger or any of the other  transactions  contemplated by
         this Agreement, (iii) seeking to prohibit BT or any of its Subsidiaries
         from  effectively  controlling in any material  respect the business or
         operations of MCI and its Subsidiaries  taken as a whole, or BT and its
         Subsidiaries  taken as a whole,  or (iv) which  otherwise  would have a
         Material  Adverse Effect on either MCI or BT; provided,  however,  that
         the  provisions  of this  Section  6.1(h) shall not be available to any
         party whose failure to fulfill its obligations  pursuant to Section 5.4
         shall have been the cause of, or shall  have  resulted  in,  such suit,
         action, investigation or proceeding.

     (i) EU  Antitrust.  BT and MCI shall have received in respect of the Merger
and any matters arising  therefrom:  (i)  confirmation by way of a decision from
the Commission of the European Communities under Regulation 4064/89 (with

<PAGE>


                                                        53

         or without the initiation of proceedings under Article 6(1)(c) thereof)
         that the Merger and any matters  arising  therefrom are compatible with
         the common market; or (ii) confirmation either: (A) in writing from the
         office of Fair Trading that it is not the intention of the Secretary of
         State for Trade  and  Industry  to refer  the  Merger  and any  matters
         arising therefrom to the Monopolies and Mergers Commission  pursuant to
         part V of the Fair Trading Act 1973; or (B) following such a reference,
         that the  Secretary of State for Trade and Industry has  permitted  the
         merger  and  any  matters  arising   therefrom  to  take  place;   such
         confirmation   being   subject  in  each  of  Sections   6.1(i)(i)  and
         6.1(i)(ii)(A)  and (B)  above to the  imposition  of no  conditions  or
         undertakings  or obligations or to the imposition only of conditions or
         undertakings or obligations  which: (1) unless BT agrees otherwise,  do
         not  constitute  a MCI  Burdensome  Condition;  (2)  unless  MCI agrees
         otherwise, do not constitute a BT Burdensome Condition; (3) unless both
         BT and MCI  agree  otherwise,  do not  constitute  a  Combined  Company
         Burdensome Condition .

     (j) United Kingdom  Treasury  Consent.  H.M.  Treasury shall have consented
pursuant to section  765(1)(c) of the Income and Corporation  Taxes Act 1988, or
H.M. Treasury or the Inland Revenue shall have confirmed that no such consent is
required, to the issue of Common Stock of the Surviving Corporation contemplated
by Section 1.8.

     6.2.  Additional  Conditions  to  Obligations  of BT and  Merger  Sub.  The
obligations  of BT and  Merger  Sub to effect  the  Merger  are  subject  to the
satisfaction  of,  or  waiver  by BT,  on or  prior to the  Closing  Date of the
following additional conditions:

                  (a)    Representations    and   Warranties.    Each   of   the
         representations  and warranties of MCI set forth in this Agreement that
         is  qualified as to  materiality  shall have been true and correct when
         made and shall be true and correct on and as of the Closing  Date as if
         made on and as of such date (other than  representations and warranties
         which address matters only as of a certain date which shall be true and
         correct as of such certain date), and each of the  representations  and
         warranties  of MCI that is not so  qualified  shall  have been true and
         correct  in all  material  respects  when  made  and  shall be true and
         correct in all  material  respects on and as of the Closing  Date as if
         made on and as of such date (other than  representations and warranties
         which address matters only as of a certain date which shall be true and
         correct in all material respects as of such certain date), and BT shall
         have  received a  certificate  of the chief  executive  officer and the
         chief financial officer of MCI to such effect.

                  (b)   Performance  of  Obligations  of  MCI.  MCI  shall  have
         performed or complied with all agreements and covenants  required to be
         performed  by it under this  Agreement  at or prior to the Closing Date
         that are  qualified  as to  materiality  and shall  have  performed  or
         complied  in all  material  respects  with  all  other  agreements  and
         covenants  required to be  performed  by it under this  Agreement at or
         prior to the


<PAGE>


                                                        54

         Closing Date that are not so qualified as to materiality,  and BT shall
         have  received a  certificate  of the chief  executive  officer and the
         chief financial officer of MCI to such effect.

                  (c) Tax  Opinion.  BT  shall  have  received  the  opinion  of
         Shearman & Sterling, counsel to BT, to the effect that, on the basis of
         the facts,  representations  and  assumptions set forth in such opinion
         (i) the Merger will be treated  for United  States  Federal  income tax
         purposes as a  reorganization  within the meaning of Section  368(a) of
         the Code,  (ii) each of MCI,  BT and Merger Sub will be a party to that
         reorganization  within the  meaning  of Section  368(b) of the Code and
         (iii) no gain or loss will be  recognized  on the exchange of shares of
         MCI Common  Stock for the Merger  Consideration,  except that gain,  if
         any,  shall be  recognized  to the  extent  of the  Cash  Consideration
         received, which opinion shall be dated on or about the date that is two
         Business Days prior to the date the Proxy Statement/Prospectus is first
         mailed to  stockholders  of MCI and which shall not have been withdrawn
         or  modified  in any  material  respect  as of the  Closing  Date.  The
         issuance  of  such  opinion   shall  be   conditioned   on  receipt  of
         representation letters from each of MCI and BT. The specific provisions
         of each  such  representation  letter  shall be in form  and  substance
         satisfactory to Shearman & Sterling and Simpson Thacher & Bartlett, and
         each such representation letter shall be dated on or before the date of
         such  opinion  and shall not have been  withdrawn  or  modified  in any
         material respect as of the Closing Date.

                  (d) Inland  Revenue  Ruling.  BT shall have  received a ruling
         from the Inland Revenue  confirming that no stamp duty reserve tax will
         be payable in respect of the issuance of BT Ordinary  Shares to the ADR
         Depositary for the benefit of holders of MCI Common Stock.

                  (e) Required Regulatory  Approvals.  All Required Consents and
         all other  authorizations,  consents,  orders  and  approvals  of,  and
         declarations  and filings with, and all  expirations of waiting periods
         imposed  by,  any  Governmental   Entity  which,  if  not  obtained  in
         connection  with  the  consummation  of the  transactions  contemplated
         hereby,  would  have a  Material  Adverse  Effect on MCI or BT (with or
         without including MCI as a Subsidiary after the Merger)  (collectively,
         "Required  Regulatory  Approvals") shall have been obtained,  have been
         declared  or filed or have  occurred,  as the case may be, and all such
         Required  Regulatory  Approvals  shall  be in full  force  and  effect;
         provided,  however,  that a Required  Regulatory  Approval shall not be
         deemed to have been  obtained if in  connection  with the grant thereof
         there shall have been an imposition by any  Governmental  Entity of any
         condition,  requirement,  restriction or change of  regulation,  or any
         other action directly or indirectly related to such grant taken by such
         Governmental  Entity  (including with respect to divestitures of assets
         or Subsidiaries), which would either (i) have a Material Adverse Effect
         on MCI (an "MCI Burdensome  Condition") or (ii) have a Material Adverse
         Effect  on BT  including  MCI  as a  Subsidiary  after  the  Merger  (a
         "Combined Company Burdensome Condition").


<PAGE>


                                                        55


                  (f) Burdensome Condition. There shall not have been any action
         taken or overtly threatened, or any statute, rule, regulation, order or
         decree enacted, entered, enforced or deemed applicable to the Merger by
         any  Governmental  Entity  which  imposes  or seeks to  impose  any MCI
         Burdensome Condition or Combined Company Burdensome Condition.

     6.3. Additional Conditions to Obligations of MCI. The obligations of MCI to
effect the Merger are  subject to the  satisfaction  of, or waiver by MCI, on or
prior to the Closing Date of the following additional conditions:

                  (a)    Representations    and   Warranties.    Each   of   the
         representations  and  warranties of BT and Merger Sub set forth in this
         Agreement that is qualified as to materiality  shall have been true and
         correct  when  made  and  shall be true  and  correct  on and as of the
         Closing   Date  as  if  made  on  and  as  of  such  date  (other  than
         representations  and  warranties  which  address  matters  only as of a
         certain date which shall be true and correct as of such certain  date),
         and each of the representations and warranties of each of BT and Merger
         Sub that is not so  qualified  shall have been true and  correct in all
         material  respects  when  made and  shall be true  and  correct  in all
         material respects on and as of the Closing Date as if made on and as of
         such date (other than  representations  and  warranties  which  address
         matters  only as of a certain  date which  shall be true and correct in
         all  material  respects as of such  certain  date),  and MCI shall have
         received a  certificate  of the chief  executive  officer and the chief
         financial officer of BT to such effect.

                  (b)  Performance of Obligations of BT. BT shall have performed
         or complied with all agreements and covenants  required to be performed
         by it under this  Agreement  at or prior to the  Closing  Date that are
         qualified as to materiality and shall have performed or complied in all
         material  respects with all  agreements  and  covenants  required to be
         performed  by it under this  Agreement  at or prior to the Closing Date
         that  are  not so  qualified  as to  materiality,  and MCI  shall  have
         received a  certificate  of the chief  executive  officer and the chief
         financial officer of BT to such effect.

                  (c) Tax  Opinion.  MCI shall  have  received  the  opinion  of
         Simpson Thacher & Bartlett,  counsel to MCI, to the effect that, on the
         basis of the facts,  representations  and assumptions set forth in such
         opinion, (i) the Merger will be treated for Federal income tax purposes
         as a  reorganization  within the meaning of Section 368(a) of the Code,
         (ii)  each  of  MCI,  BT  and  Merger  Sub  will  be a  party  to  that
         reorganization  within the  meaning  of Section  368(b) of the Code and
         (iii) no gain or loss will be  recognized  on the exchange of shares of
         MCI Common  Stock for the Merger  Consideration,  except that gain,  if
         any,  shall be  recognized  to the  extent  of the  Cash  Consideration
         received, which opinion shall be dated on or about the date that is two
         Business Days prior to the date the Proxy Statement/Prospectus is first
         mailed to  stockholders  of MCI and which shall not have been withdrawn
         or  modified  in any  material  respect  as of the  Closing  Date.  The
         issuance of such opinion shall be


<PAGE>


                                                        56

         conditioned on receipt of  representation  letters from each of MCI and
         BT. The specific provisions of each such representation letter shall be
         in form and substance  satisfactory  to Shearman & Sterling and Simpson
         Thacher & Bartlett,  and each such representation letter shall be dated
         on or before the date of such opinion and shall not have been withdrawn
         or modified in any material respect as of the Closing Date.

                  (d) Required Regulatory  Approvals.  All Required Consents and
         all other  authorizations,  consents,  orders  and  approvals  of,  and
         declarations  and filings with, and all  expirations of waiting periods
         imposed  by,  any  Governmental   Entity  which,  if  not  obtained  in
         connection  with  the  consummation  of the  transactions  contemplated
         hereby,  would have a Material  Adverse  Effect on BT after the Merger,
         including  MCI as a  Subsidiary  (collectively,  "Regulatory  Approvals
         Required"),  shall have been  obtained,  have been declared or filed or
         have occurred,  as the case may be, and all such  Regulatory  Approvals
         Required shall be in full force and effect;  provided,  however, that a
         Regulatory  Approval Required shall not be deemed to have been obtained
         if in  connection  with the  grant  thereof  there  shall  have been an
         imposition by any  Governmental  Entity of any condition,  requirement,
         restriction  or change of regulation,  or any other action  directly or
         indirectly  related to such  grant  taken by such  Governmental  Entity
         (including  with respect to  divestitures  of assets or  Subsidiaries),
         which  would  either  (i) have a Material  Adverse  Effect on BT (a "BT
         Burdensome Condition") or (ii) constitute a Combined Company Burdensome
         Condition.

                  (e) Burdensome Condition. There shall not have been any action
         taken or overtly threatened, or any statute, rule, regulation, order or
         decree enacted, entered, enforced or deemed applicable to the Merger by
         any  Governmental  Entity  which  imposes  or  seeks to  impose  any BT
         Burdensome Condition or Combined Company Burdensome Condition.



                                   ARTICLE VII

                            TERMINATION AND AMENDMENT


     7.1. Termination. This Agreement may be terminated at any time prior to the
Effective  Time,  by action taken or authorized by the Board of Directors of the
terminating  party or parties,  whether  before or after approval of the matters
presented in connection  with the Merger by the  stockholders  of MCI and by the
shareholders of BT:
   
     (a) By mutual written consent of BT and MCI, by action of their  respective
Boards of Directors;


<PAGE>


                                                        57

                  (b) By either MCI or BT if the  Effective  Time shall not have
         occurred  on or  before  October  31,  1997 (the  "Termination  Date");
         provided,  however,  that the right to terminate this  Agreement  under
         this Section  7.1(b) shall not be available to any party whose  failure
         to fulfill any  obligation  under this Agreement has been the cause of,
         or resulted in, the failure of the Effective Time to occur on or before
         the Termination Date; and provided, further, that if on the Termination
         Date any conditions to the Closing set forth in Sections  6.1(c),  (d),
         (e),  (i) and (j),  Section  6.2(e) and (f) and Section  6.3(d) and (e)
         shall not have been fulfilled,  but all other conditions to the Closing
         shall be  fulfilled  or shall be capable of being  fulfilled,  then the
         Termination Date shall be extended to April 30, 1998;

                  (c) By either MCI or BT if any  Governmental  Entity (i) shall
         have issued an order, decree or ruling or taken any other action (which
         order,  decree,  ruling or other action the parties shall have used all
         reasonable  best  efforts to resist,  resolve or lift,  as  applicable,
         subject to the  provisions  of Section  5.4)  permanently  restraining,
         enjoining or otherwise  prohibiting  the  transactions  contemplated by
         this Agreement,  and such order,  decree,  ruling or other action shall
         have become final and  nonappealable or (ii) shall have failed to issue
         an order,  decree or ruling or to take any other action  (which  order,
         decree  or ruling  or other  action  the  parties  shall  have used all
         reasonable best efforts to obtain, subject to the provisions of Section
         5.4), in each case  necessary to fulfill the  conditions to the Closing
         set forth in Sections 6.1(c), (d), (e), (i) and (j), Section 6.2(e) and
         (f) and  Section  6.3(d) and (e), as  applicable,  and such denial of a
         request to issue such order,  decree,  ruling or take such other action
         shall have become final and nonappealable;

                  (d) By either BT or MCI if the approval by the stockholders of
         MCI or of BT required for the  consummation  of the Merger or the other
         transactions contemplated hereby shall not have been obtained by reason
         of the failure to obtain the  required  vote at a duly held  meeting of
         stockholders or at any adjournment thereof;

                  (e) By either MCI or BT if the Board of Directors of the other
         party (i) shall  withdraw or modify in any adverse  manner its approval
         or recommendation  of this Agreement or the Merger,  (ii) shall fail to
         reaffirm such  approval or  recommendation  upon such party's  request,
         (iii) shall approve or recommend any acquisition of such other party or
         a material  portion of its assets or any tender offer for shares of its
         capital  stock,  in each  case,  other  than by a  party  hereto  or an
         affiliate  thereof,  or (iv) shall  resolve to take any of the  actions
         specified in clauses (i) through (iii) above;

                  (f) By either MCI or BT, upon five Business Days' prior notice
         to the other, if, as a result of a Superior  Proposal  received by such
         party from a Person other than a party to this  Agreement or any of its
         affiliates,  the Board of  Directors of such party  determines  in good
         faith that their fiduciary obligations under applicable


<PAGE>


                                                        58

         law require that such Superior Proposal be accepted; provided, however,
         that (i) the Board of Directors  of such party shall have  concluded in
         good faith,  after considering  applicable  provisions of law and after
         giving  effect to all  concessions  which may be  offered  by the other
         party pursuant to clause (ii) below, on the basis of advice of counsel,
         that such action is  necessary  for such Board of Directors to act in a
         manner  consistent with its fiduciary  duties under applicable laws and
         (ii) prior to any such  termination,  such party shall, and shall cause
         its  respective  financial and legal  advisors to,  negotiate  with the
         other party to this Agreement to make such adjustments in the terms and
         conditions of this Agreement as would enable such party to proceed with
         the transactions contemplated hereby; provided,  however, that it shall
         be a condition to  termination  by BT pursuant to this  Section  7.1(f)
         that BT shall have made the payment of the Alternative  Transaction Fee
         to MCI  required  by Section  7.2(b),  and it shall be a  condition  to
         termination  by MCI pursuant to this Section 7.1(f) that MCI shall have
         made the payment of the  Alternative  Transaction Fee to BT required by
         Section 7.2(c);

                  (g) By BT,  upon a  breach  of any  representation,  warranty,
         covenant or agreement  on the part of MCI set forth in this  Agreement,
         or if any  representation  or warranty of MCI shall have become untrue,
         in either case such that the  conditions set forth in Section 6.2(a) or
         Section  6.2(b) would not be satisfied (a  "Terminating  MCI  Breach");
         provided,  however,  that, if such Terminating MCI Breach is capable of
         being cured by MCI prior to October 31,  1997  through the  exercise of
         its best efforts and for so long as MCI continues to exercise such best
         efforts, BT may not terminate this Agreement under this Section 7.1(g);
         or

                  (h)  By  MCI,  upon  breach  of any  material  representation,
         warranty,  covenant or  agreement  on the part of BT and Merger Sub set
         forth in this Agreement, or if any representation or warranty of BT and
         Merger  Sub shall  have  become  untrue,  in either  case such that the
         conditions  set forth in Section  6.3(a) or Section 6.3(b) would not be
         satisfied ("Terminating BT Breach");  provided,  however, that, if such
         Terminating  BT Breach is capable of being cured by BT prior to October
         31, 1997 through the exercise of best efforts,  so long as BT continues
         to exercise such best efforts,  MCI may not  terminate  this  Agreement
         under this Section 7.1(h).

                  7.2.     Effect of Termination.

                  (a) In the event of  termination  of this  Agreement by either
         MCI or BT as provided in Section 7.1, this  Agreement  shall  forthwith
         become void and there shall be no liability or  obligation  on the part
         of BT or MCI or their respective  officers or directors except (i) with
         respect to Sections 3.1(p), 3.2(n), the second sentence of Section 5.3,
         Section  5.10,  this Section 7.2 and Article VIII and (ii) with respect
         to any  liabilities  or damages  incurred  or  suffered by a party as a
         result  of  the  willful  breach  by  the  other  party  of  any of its
         representations, warranties, covenants or other agreements set forth in
         this Agreement.


<PAGE>


                                                        59


                  (b) BT and MCI  agree  that (i) if MCI  shall  terminate  this
         Agreement pursuant to Section 7.1(e) and, at the time of the occurrence
         of the circumstance  permitting  termination  pursuant to such Section,
         there shall exist an Acquisition Proposal with respect to BT or (ii) if
         BT shall  terminate this Agreement  pursuant to Section 7.1(f) or (iii)
         if (A) BT or MCI shall  terminate  this  Agreement  pursuant to Section
         7.1(d) due to the  failure of BT's  shareholders  to approve  and adopt
         this  Agreement  and (B) at the time of such  failure to so approve and
         adopt this  Agreement  there shall exist an  Acquisition  Proposal with
         respect  to BT  and,  within  12  months  of the  termination  of  this
         Agreement,  BT enters into a definitive  agreement with any third party
         with respect to an  Acquisition  Proposal,  then BT shall pay to MCI an
         amount  equal  to  the  sum  of  (w)  $450,000,000   (the  "Alternative
         Transaction  Fee") and (x) all of MCI's  Expenses up to an amount equal
         to $15,000,000  (the "Expense  Amount").  BT and MCI agree that, if MCI
         shall   terminate  this   Agreement   pursuant  to  Section  7.1(e)  in
         circumstances in which the Alternative  Transaction Fee is not payable,
         then BT shall pay to MCI an amount equal to the sum of (y) $150,000,000
         (the  "Termination  Fee") and (z) all of MCI's Expenses up to an amount
         equal to the Expense Amount.

                  (c) BT and MCI  agree  that  (i) if BT  shall  terminate  this
         Agreement pursuant to Section 7.1(e) and, at the time of the occurrence
         of the circumstance  permitting  termination  pursuant to such Section,
         there shall exist an  Acquisition  Proposal with respect to MCI or (ii)
         if MCI shall  terminate  this  Agreement  pursuant to Section 7.1(f) or
         (iii) if (A) MCI or BT  shall  terminate  this  Agreement  pursuant  to
         Section 7.1(d) due to the failure of MCI's  stockholders to approve and
         adopt this  Agreement and (B) at the time of such failure to so approve
         and adopt this Agreement there shall exist an Acquisition Proposal with
         respect  to MCI  and,  within  12  months  of the  termination  of this
         Agreement,  MCI enters into a definitive agreement with any third party
         with respect to an  Acquisition  Proposal,  then MCI shall pay to BT an
         amount equal to the sum of (w) the Alternative  Transaction Fee and (x)
         all of BT's  Expenses up to an amount equal to the Expense  Amount.  BT
         and MCI agree that, if BT shall  terminate this  Agreement  pursuant to
         Section 7.1(e) in  circumstances  in which the Alternative  Transaction
         Fee is not payable, then MCI shall pay to BT an amount equal to the sum
         of (y) the Termination Fee and (z) all of BT's Expenses up to an amount
         equal to the Expense Amount.

                  (d)  The  Alternative  Transaction  Fee  required  to be  paid
         pursuant to Section 7.2(b)(ii) or 7.2(c)(ii),  as applicable,  shall be
         made  prior  to,  and  shall  be a  precondition  to  effectiveness  of
         termination   of  this   Agreement   pursuant  such  Sections  and  the
         Alternative  Transaction  Fee  required to be paid  pursuant to Section
         7.2(b)(iii) or 7.2(c)(iii),  as applicable,  shall be made to the party
         entitled  to  receive  such  payment on the next  Business  Day after a
         definitive agreement is entered into with a third party with respect to
         an Acquisition Proposal. Any payment of an Alternative  Transaction Fee
         or a Termination Fee otherwise required to be made pursuant to


<PAGE>


                                                        60

         Section 7.2(b) or 7.2(c) shall be made to the party entitled to receive
         such payment not later than two Business Days after termination of this
         Agreement.  Payment of Expenses  pursuant  to Section  7.2(b) or 7.2(c)
         shall be made not later than two  Business  Days after  delivery to the
         other party of notice of demand for payment and an itemization  setting
         forth in  reasonable  detail  all  Expenses  of the party  entitled  to
         receive payment (which itemization may be supplemented and updated from
         time to time by such party until the 60th day after such party delivers
         such notice of demand for payment). All payments under this Section 7.2
         shall be made by wire  transfer of  immediately  available  funds to an
         account designated by the party entitled to receive payment.

                  7.3.  Amendment.  This Agreement may be amended by the parties
hereto,  by action taken or authorized by their respective  Boards of Directors,
at any time before or after approval of the matters presented in connection with
the Merger by the stockholders of MCI or of BT, but, after any such approval, no
amendment  shall be made  which by law or in  accordance  with the  rules of any
relevant stock exchange requires further approval by such  stockholders  without
such further approval. This Agreement may not be amended except by an instrument
in writing signed on behalf of each of the parties hereto.

                  7.4.  Extension;  Waiver.  At any time prior to the  Effective
Time,  the parties  hereto,  by action taken or authorized  by their  respective
Boards of Directors, may, to the extent legally allowed, (i) extend the time for
the  performance  of any of the  obligations  or other acts of the other parties
hereto,  (ii)  waive any  inaccuracies  in the  representations  and  warranties
contained  herein or in any document  delivered  pursuant hereto and (iii) waive
compliance  with any of the  agreements  or  conditions  contained  herein.  Any
agreement on the part of a party hereto to any such extension or waiver shall be
valid only if set forth in a written  instrument signed on behalf of such party.
The  failure of any party to this  Agreement  to assert any of its rights  under
this Agreement or otherwise shall not constitute a waiver of those rights.


                                  ARTICLE VIII

                               GENERAL PROVISIONS


                  8.1.   Non-Survival   of   Representations,   Warranties   and
Agreements.  None  of  the  representations,  warranties,  covenants  and  other
agreements in this  Agreement or in any  instrument  delivered  pursuant to this
Agreement,   including   any   rights   arising   out  of  any  breach  of  such
representations,  warranties,  covenants and other agreements, shall survive the
Effective Time,  except for those covenants and agreements  contained herein and
therein  that by their  terms apply or are to be  performed  in whole or in part
after the  Effective  Time and this  Article  VIII.  Nothing in this Section 8.1
shall relieve any party for any breach of any


<PAGE>


                                                        61

representation,   warranty,  covenant  or  other  agreement  in  this  Agreement
occurring prior to termination.

                  8.2. Notices. All notices and other  communications  hereunder
shall be in writing  and shall be deemed  duly given (a) on the date of delivery
if delivered personally,  or by telecopy or telefacsimile,  upon confirmation of
receipt,  (b) on the  first  Business  Day  following  the date of  dispatch  if
delivered by a recognized next-day courier service, or (c) on the tenth Business
Day following the date of mailing if delivered by registered or certified  mail,
return  receipt  requested,  postage  prepaid.  All notices  hereunder  shall be
delivered as set forth below,  or pursuant to such other  instructions as may be
designated in writing by the party to receive such notice:

                  (a)      if to BT or Merger Sub, to

                           British Telecommunications plc
                           BT Centre
                           81 Newgate Street
                           Attention:  Colin R. Green, Secretary and
                                            Chief Legal Adviser
                           Facsimile No.:  011-44-171-356-6135

                           with copies to

                           Shearman & Sterling
                           599 Lexington Avenue
                           New York, New York  10022
                           Attention:  Creighton O'M. Condon
                           Facsimile No.:  (212) 848-7179

                           and

                           Shearman & Sterling
                           199 Bishopsgate
                           London EC2M 3TY
                           England
                           Attention:  W. Jeffrey Lawrence
                           Facsimile No.:  011-44-171-920-9020



<PAGE>


                                                        62

                  (b)      if to MCI, to

                           MCI Communications Corporation
                           1801 Pennsylvania Avenue, NW
                           Attention: Michael Salsbury, Executive Vice President
                                            and General Counsel
                           Facsimile No.:  202-887-3353

                           with a copy to

                           Simpson Thacher & Bartlett
                           425 Lexington Avenue
                           New York, New York 10017
                           Attention:  Philip T. Ruegger
                           Facsimile No.:  (212) 455-2502

                  8.3.  Interpretation.   When  a  reference  is  made  in  this
Agreement to  Sections,  Exhibits or  Schedules,  such  reference  shall be to a
Section of or Exhibit or Schedule to this Agreement unless otherwise  indicated.
The table of contents,  glossary of defined terms and headings contained in this
Agreement  are for  reference  purposes only and shall not affect in any way the
meaning or  interpretation  of this  Agreement.  Whenever  the words  "include",
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed  by the  words  "without  limitation".  The  phrases  "the date of this
Agreement"  and "the date hereof"  shall be deemed to refer to November 3, 1996.
The parties agree that the Closing  conditions  set forth in Section  6.2(a) and
6.2(b),  respectively,  shall be  deemed  not to be  satisfied  in the event the
aggregate  number of  outstanding  shares of MCI Common  Stock and shares of MCI
Common Stock subject to outstanding  options,  warrants and rights (i) as of the
date of execution  of this  Agreement,  or (ii) issued  between the date of this
Agreement and the  Effective  Time,  in either case  aggregates  500,000 or more
shares than as represented by MCI under Section 3.1(b) or as permitted  pursuant
Section 4.1(c), respectively.

                  8.4.  Counterparts.  This  Agreement may be executed in one or
more  counterparts,  all of which shall be considered one and the same agreement
and shall become  effective  when one or more  counterparts  have been signed by
each of the parties and delivered to the other party,  it being  understood that
both parties need not sign the same counterpart.

                  8.5. Entire Agreement; No Third Party Beneficiaries.  (a) This
Agreement  constitutes the entire  agreement and supersedes all prior agreements
and understandings, both written and oral, among the parties with respect to the
subject matter hereof,  other than the  Confidentiality  Agreement,  which shall
survive the execution and delivery of this Agreement.



<PAGE>


                                                        63

                  (b) This  Agreement  shall be binding upon and inure solely to
the  benefit of each party  hereto,  and nothing in this  Agreement,  express or
implied, is intended to or shall confer upon any other Person any right, benefit
or remedy of any nature  whatsoever under or by reason of this Agreement,  other
than  Section  5.11  (which is  intended  to be for the  benefit of the  Persons
covered thereby and may be enforced by such Persons).

     8.6.  Governing  Law.  This  Agreement  shall be governed and  construed in
accordance with the laws of the State of New York.

                  8.7.  Severability.  If any  term or other  provision  of this
Agreement  is  invalid,  illegal or  incapable  of being  enforced by any law or
public  policy,   all  other  terms  and  provisions  of  this  Agreement  shall
nevertheless  remain in full force and effect so long as the  economic  or legal
substance of the transactions  contemplated hereby is not affected in any manner
materially  adverse to any party. Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall  negotiate  in good  faith to modify  this  Agreement  so as to effect the
original intent of the parties as closely as possible in an acceptable manner in
order that the  transactions  contemplated  hereby are consummated as originally
contemplated to the greatest extent possible.

                  8.8. Assignment. Neither this Agreement nor any of the rights,
interests  or  obligations  hereunder  shall be  assigned  by any of the parties
hereto, in whole or in part (whether by operation of law or otherwise),  without
the prior written  consent of the other party,  and any attempt to make any such
assignment  without such consent shall be null and void,  except that Merger Sub
may assign,  in its sole  discretion,  any or all of its rights,  interests  and
obligations  under  this  Agreement  to any  direct  or  indirect  wholly  owned
Subsidiary  of BT without  the  consent  of MCI,  but no such  assignment  shall
relieve Merger Sub of any of its obligations  under this  Agreement.  Subject to
the  preceding  sentence,  this  Agreement  will be binding  upon,  inure to the
benefit of and be enforceable by the parties and their respective successors and
assigns.

                  8.9.  Restrictive Trade Practices.  Notwithstanding  any other
provisions of this Agreement, each party declares that it shall not give effect,
and shall  procure  that none of its  Subsidiaries  shall  give  effect,  to any
restriction  or  restrictions  contained  in this  Agreement  which  cause  this
Agreement to be registrable under the Restrictive Trade Practices Act 1976 until
one day after  particulars  of this  Agreement  shall have been furnished to the
Director  General  of Fair  Trading.  For the  purposes  of  this  Section  8.9,
"Agreement"  shall  include  any  other  agreement  which,  together  with  this
Agreement,  may form part of an agreement  for the  purposes of the  Restrictive
Trade Practices Act 1976.

                  8.10. Submission to Jurisdiction;  Waivers. Each of BT and MCI
irrevocably  agrees that any legal  action or  proceeding  with  respect to this
Agreement or for  recognition  and enforcement of any judgment in respect hereof
brought by the other party  hereto or its  successors  or assigns may be brought
and  determined in the Supreme Court of the State of New York in New York County
or in the United States District Court for the Southern


<PAGE>


                                                        64

District of New York,  and each of BT and MCI hereby  irrevocably  submits  with
regard  to any such  action or  proceeding  for  itself  and in  respect  to its
property, generally and unconditionally, to the nonexclusive jurisdiction of the
aforesaid courts.  Each of BT and MCI hereby irrevocably  waives, and agrees not
to assert,  by way of motion,  as a defense,  counterclaim or otherwise,  in any
action  or  proceeding  with  respect  to this  Agreement,  (a) the  defense  of
sovereign  immunity,  (b) any claim  that it is not  personally  subject  to the
jurisdiction of the above-named  courts for any reason other than the failure to
serve process in accordance  with this Section 8.10, (c) that it or its property
is  exempt  or  immune  from  jurisdiction  of any such  court or from any legal
process commenced in such courts (whether through service of notice,  attachment
prior to judgment,  attachment  in aid of  execution  of judgment,  execution of
judgment or otherwise),  and (d) to the fullest  extent  permitted by applicable
law, that (i) the suit,  action or proceeding in any such court is brought in an
inconvenient  forum,  (ii) the  venue of such  suit,  action  or  proceeding  is
improper and (iii) this  Agreement,  or the subject  matter  hereof,  may not be
enforced in or by such courts.

                  8.11.  Enforcement.  The parties agree that irreparable damage
would occur in the event that any of the  provisions of this  Agreement were not
performed in accordance with their specific terms. It is accordingly agreed that
the parties shall be entitled to specific  performance of the terms hereof, this
being in  addition to any other  remedy to which they are  entitled at law or in
equity.

                  8.12.    Definitions.  As used in this Agreement:

                  (a)      "Board of Directors" means the Board of Directors of
         any specified Person and any committees thereof.

                  (b)  "Business  Day"  means  any day on  which  banks  are not
         required or  authorized  to close in either the City of New York or the
         City of London.

                  (c)      "FCC Order" means either:

                           (i) A written order or other  determination  from the
                  staff of the FCC (either in the first instance or upon review,
                  reconsideration  or  other  action  subsequent  to an order or
                  other   determination  of  the  staff)  either  approving  the
                  consummation   of  the   transactions   contemplated  by  this
                  Agreement or stating that no such approval is required (or, in
                  the case of such review,  reconsideration  or other subsequent
                  action,  a written order or other  determination to the effect
                  set forth  above or  affirming  or  upholding,  or having  the
                  effect of affirming or  upholding,  whether by  dismissing  or
                  denying a petition  for  reconsideration  or  terminating  the
                  consideration  thereof  or  otherwise,  a  previous  order  or
                  determination  to the effect set forth in this paragraph (i)),
                  which  order or  determination  shall no longer be  subject to
                  further administrative review by the FCC; or



<PAGE>


                                                        65

                           (ii) A written  or other  determination  from the FCC
                  itself   (either  in  the  first   instance  or  upon  review,
                  reconsideration  or  other  action  subsequent  to an order or
                  other  determination of the staff of the FCC) either approving
                  the  consummation  of the  transactions  contemplated  by this
                  Agreement or stating that no such approval is required (or, in
                  the  case of such  review,  reconsideration  or  other  action
                  subsequent  to an order or  determination  of the staff of the
                  FCC,  a  written  order  or other  determination  from the FCC
                  itself to the effect set forth above or  affirming,  upholding
                  or having the effect of  affirming  or  upholding,  whether by
                  dismissing  or  denying  a  petition  for  reconsideration  or
                  application  for  review  or  terminating  the   consideration
                  thereof or otherwise,  an order or other  determination of the
                  staff of the FCC to the effect set forth in paragraph (i)).

         For purposes of this definition, an order or other determination of the
         staff  shall be deemed  no longer  subject  to  further  administrative
         review by the FCC:

                           (x) If no petition for reconsideration or application
                  for  review  by the FCC of the order or  determination  of the
                  staff has been  filed  within 30 days after the date of public
                  notice of the order or  determination,  as such 30- day period
                  is computed and as such date is defined in sections  1.104 and
                  1.4, as  applicable,  of the FCC's rules,  and the FCC has not
                  initiated review of the order or determination of the staff on
                  its own motion  within 40 days after the date of public notice
                  of the  order  or  determination,  as such  40-day  period  is
                  computed and as such date is defined in sections 1.117 and 1.4
                  of the FCC's rules, or

                           (y) If  any  such  petition  for  reconsideration  or
                  application  for  review  has been  filed,  or, if the FCC has
                  initiated review of the order or determination of the staff on
                  its own motion,  the FCC itself has issued a written  order or
                  other  determination  or taken other  action to the effect set
                  forth in paragraph (ii) above.

                  (d)  "Material  Adverse  Effect"  means,  with  respect to any
         entity, any adverse change,  circumstance or effect that,  individually
         or in the aggregate with all other adverse changes,  circumstances  and
         effects,  is or is reasonably  likely to be  materially  adverse to the
         business,   operations,   assets,   liabilities   (including,   without
         limitation, contingent liabilities),  financial condition or results of
         operations of such entity and its Subsidiaries taken as a whole.

                  (e) "the other  party"  means,  with  respect  to MCI,  BT and
         means, with respect to BT, MCI.

                  (f) "Person"  means an individual,  corporation,  partnership,
         association,  trust, unincorporated  organization,  entity or group (as
         defined in the Exchange Act).


<PAGE>


                                                        66


                  (g) "Subsidiary" when used with respect to any party means any
         corporation   or   other   organization,    whether   incorporated   or
         unincorporated, (i) of which such party or any other Subsidiary of such
         party  is  a  general  partner  (excluding  partnerships,  the  general
         partnership  interests of which held by such party or any Subsidiary of
         such  party do not have a  majority  of the  voting  interests  in such
         partnership)  or (ii) at least a majority  of the  securities  or other
         interests of which having by their terms ordinary voting power to elect
         a  majority  of the Board of  Directors  or others  performing  similar
         functions  with respect to such  corporation or other  organization  is
         directly or indirectly  owned or controlled by such party or by any one
         or more of its  Subsidiaries,  or by such  party and one or more of its
         Subsidiaries.

                  (h) (i) "Tax" (including,  with correlative meaning, the terms
         "Taxes" and  "Taxable")  means all  federal,  state,  local and foreign
         income,  profits,  franchise,  gross receipts,  environmental,  customs
         duty, capital stock,  severance,  stamp,  payroll,  sales,  employment,
         unemployment   disability,   use,   property,   withholding,    excise,
         production,   value  added,   occupancy  and  other  taxes,  duties  or
         assessments  of any  nature  whatsoever,  together  with all  interest,
         penalties,  fines and  additions  to tax imposed  with  respect to such
         amounts and any interest in respect of such  penalties and additions to
         tax,  and (ii) "Tax  Return"  means all returns and reports  (including
         elections, claims,  declarations,  disclosures,  schedules,  estimates,
         computations and information  returns) required to be supplied to a Tax
         authority in any jurisdiction relating to Taxes.

                  8.13.  Other  Agreements.  The parties hereto  acknowledge and
agree that,  except as  otherwise  expressly  set forth in this  Agreement,  the
rights  and  obligations  of MCI and BT  under  the  Investment  Agreement,  the
Modified  Joint Venture  Agreement  made the 14th day of June,  1994 between BT,
Moorgate   (Twelve)   Limited,   MCI,  MCI  Ventures   Corporation,   Shepperton
Communications  Company and any other agreement between the parties shall not be
affected by any provision of this Agreement.



<PAGE>


                                                        67



     8.14.  Waiver of Jury Trial.  Each of the parties  hereto  irrevocably  and
unconditionally  waives trial by jury in any legal action or proceeding relating
to  this  Agreement  or  the  transactions   contemplated  hereby  and  for  any
counterclaim therein.

                  IN WITNESS  WHEREOF,  BT, MCI and Merger Sub have  caused this
Agreement to be signed by their respective  officers  thereunto duly authorized,
all as of November 3, 1996.


                                     BRITISH TELECOMMUNICATIONS plc

ATTEST BY:
                                       By:
                                      Name:
___________________                                           Title:



                                     MCI COMMUNICATIONS CORPORATION

ATTEST BY:
                                       By:
                                      Name:
___________________                                           Title:



                                      TADWORTH CORPORATION

ATTEST BY:
                                       By:
                                      Name:
___________________                                           Title:





                                                                                
                                TABLE OF CONTENTS
                                                                          Page


                                    ARTICLE I

                                   THE MERGER

         1.1.     The Merger................................................ 2
         1.2.     Closing................................................... 2
         1.3.     Effective Time............................................ 2
         1.4.     Effects of the Merger..................................... 2
         1.5.     Certificate of Incorporation.............................. 2
         1.6.     By-Laws................................................... 3
         1.7.     Officers of Surviving Corporation......................... 3
         1.8.     Effect on Capital Stock................................... 3
                  (a)      Cancellation of Treasury Stock and BT-Owned Stock 3
                  (b)      Conversion of MCI Common Stock................... 3
                  (c)      Allotment of BT Ordinary Shares.................. 3

                                   ARTICLE II

                            EXCHANGE OF CERTIFICATES

         2.1.     Exchange Fund............................................. 4
         2.2.     Exchange Procedures....................................... 5
         2.3.     Distributions with Respect to Unexchanged Shares.......... 5
         2.4.     No Further Ownership Rights in MCI Common Stock........... 6
         2.5.     No Fractional BT ADSs..................................... 6
         2.6.     Termination of Exchange Fund.............................. 6
         2.7.     No Liability.............................................. 7
         2.8.     Investment of Exchange Fund............................... 7
         2.9.     Lost Certificates......................................... 7
         2.10.    Withholding Rights........................................ 7
         2.11.    Further Assurances........................................ 7
         2.12.    Stock Transfer Books...................................... 8
         2.13.    Restricted BT ADRs........................................ 8
         2.14.    Shares of Dissenting Stockholders......................... 8

                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

         3.1.     Representations and Warranties of MCI..................... 9
                  (a)      Organization, Standing and Power................. 9
                  (b)      Capital Structure................................ 9


<PAGE>


                                                   -ii-

                  (c)      Authority; No Conflicts..........................  10
                  (d)      Reports and Financial Statements.................  12
                  (e)      Information Supplied.............................  13
                  (f)      Compliance with Applicable Laws;Regulatory Matters 13
                  (g)      Litigation........................................ 14
                  (h)      Taxes............................................. 14
                  (i)      Subsidiaries and Equity Interests................. 15
                  (j)      Absence of Certain Changes or Events.............. 16
                  (k)      Section 203 of the DGCL Not Applicable............ 16
                  (l)      Vote Required..................................... 16
                  (m)      MCI Rights Agreement.............................. 17
                  (n)      Certain Agreements................................ 17
                  (o)      Employee Benefit Plans; Labor Matters..............18
                  (p)      Brokers or Finders.................................19
                  (q)      Opinion of Financial Advisor.......................19
                  (r)      Intellectual Property Rights.......................19
         3.2.  Representations and Warranties of BT...........................20
                  (a)      Organization, Standing and Power...................21
                  (b)      Capital Structure..................................21
                  (c)      Authority; No Conflicts............................22
                  (d)      Reports and Financial Statements...................23
                  (e)      Information Supplied...............................24
                  (f)      Compliance with Applicable Laws;Regulatory Matters.25
                  (g)      Litigation.........................................25
                  (h)      Taxes..............................................26
                  (i)      Subsidiaries and Equity Interests..................26
                  (j)      Absence of Certain Changes or Events...............27
                  (k)      Vote Required......................................28
                  (l)      Certain Agreements.................................28
                  (m)      Employee Benefit Plans; Labor Matters..............28
                  (n)      Brokers or Finders.................................29
                  (o)      Ownership of MCI Common Stock......................29
                  (p)      Intellectual Property Rights.......................29
         3.3.     Representations and Warranties of BT and Merger Sub.........30
                  (a)      Organization and Corporate Power...................31
                  (b)      Corporate Authorization............................31
                  (c)      Non-Contravention..................................31
                  (d)      No Business Activities.............................31

                                   ARTICLE IV

                    COVENANTS RELATING TO CONDUCT OF BUSINESS

         4.1.     Covenants of MCI........................................... 31


<PAGE>


                                                  -iii-

                  (a)      Ordinary Course................................... 31
                  (b)      Dividends; Changes in Share Capital............... 32
                  (c)      Issuance of Securities............................ 32
                  (d)      Governing Documents............................... 33
                  (e)      No Acquisitions................................... 33
                  (f)      No Dispositions................................... 33
                  (g)      Indebtedness...................................... 33
                  (h)      Benefit Plans..................................... 34
                  (i)      Other Actions..................................... 34
                  (j)      Accounting Methods; Income Tax Elections...........34
                  (k)      Tax-Free Qualification.............................34
                  (l)      Certain Agreements.................................34
         4.2.     Covenants of BT.............................................34
                  (a)      Ordinary Course....................................35
                  (b)      Dividends; Changes in Stock........................35
                  (c)      Issuance of Securities.............................36
                  (d)      Governing Documents................................36
                  (e)      No Acquisitions....................................36
                  (f)      No Dispositions....................................36
                  (g)      Indebtedness.......................................37
                  (h)      Benefit Plans......................................37
                  (i)      Other Actions......................................37
                  (j)      Accounting Methods; Income Tax Elections...........37
                  (k)      Tax-Free Qualification.............................37
                  (l)      Certain Agreements.................................38
                  (m)      Certain Arrangements...............................38
         4.3.     Advice of Changes; Government Filings.......................38
         4.4.     Transition Planning.........................................39
         4.5.     Control of Other Party's Business...........................39

                                    ARTICLE V

                              ADDITIONAL AGREEMENTS

         5.1.     Preparation of Disclosure Documents; MCI Stockholder and BT
                  Shareholder Meetings....................................... 39
         5.2.     BT Board of Directors; Officers; Headquarters.............. 41
         5.3.     Access to Information...................................... 42
         5.4.     Approvals and Consents; Cooperation........................ 42
         5.5.     Affiliates' and Auditors' Letters.......................... 43
         5.6.     Stock Exchange Listings.................................... 44
         5.7.     Acquisition Proposals...................................... 44
         5.8.     Stock Options and Other Stock Plans........................ 46
         5.9.     Employment Agreements; Employee Benefits Matters........... 48


<PAGE>


                                                   -iv-

         5.10.    Fees and Expenses.......................................... 49
         5.11.    Indemnification; Directors' and Officers' Insurance........ 49
         5.12.    Rights Agreement........................................... 49
         5.13.    Interim Cooperative Arrangements........................... 49
         5.14.    Public Announcements....................................... 50
         5.15.    Investment Agreement....................................... 50
         5.16.    Repurchase Authorization................................... 50
         5.17.    Holding Company Structure; Name............................ 50
         5.18.    Global Activities.......................................... 51

                                   ARTICLE VI

                              CONDITIONS PRECEDENT

         6.1.     Conditions to Each Party's Obligation to Effect the Merger. 51
                  (a)      Stockholder Approvals............................. 51
                  (b)      Stock Exchange Listings........................... 51
                  (c)      HSR Act........................................... 51
                  (d)      FCC Order......................................... 51
                  (e)      Exon-Florio....................................... 52
                  (f)      Securities Law.................................... 52
                  (g)      No Injunctions or Restraints, Illegality.......... 52
                  (h)      No Litigation..................................... 52
                  (i)      EU Antitrust...................................... 52
                  (j)      United Kingdom Treasury Consent................... 53
         6.2.     Additional Conditions to Obligations of BT and Merger Sub.. 53
                  (a)      Representations and Warranties.................... 53
                  (b)      Performance of Obligations of MCI................. 53
                  (c)      Tax Opinion....................................... 54
                  (d)      Inland Revenue Ruling............................. 54
                  (e)      Required Regulatory Approvals..................... 54
                  (f)      Burdensome Condition.............................. 55
         6.3.     Additional Conditions to Obligations of MCI................ 55
                  (a)      Representations and Warranties.................... 55
                  (b)      Performance of Obligations of BT.................. 55
                  (c)      Tax Opinion....................................... 55
                  (d)      Required Regulatory Approvals..................... 56
                  (e)      Burdensome Condition.............................. 56

                                   ARTICLE VII

                            TERMINATION AND AMENDMENT

         7.1.     Termination................................................ 56


<PAGE>


                                                   -v-

         7.2.     Effect of Termination.....................................  58
         7.3.     Amendment.................................................. 60
         7.4.     Extension; Waiver.......................................... 60

                                  ARTICLE VIII

                               GENERAL PROVISIONS

         8.1.     Non-Survival of Representations, Warranties and Agreements. 60
         8.2.     Notices.................................................... 61
         8.3.     Interpretation............................................. 62
         8.4.     Counterparts............................................... 62
         8.5.     Entire Agreement; No Third Party Beneficiaries............. 62
         8.6.     Governing Law.............................................. 63
         8.7.     Severability............................................... 63
         8.8.     Assignment................................................. 63
         8.9.     Restrictive Trade Practices................................ 63
         8.10.    Submission to Jurisdiction; Waivers........................ 63
         8.11.    Enforcement................................................ 64
         8.12.    Definitions................................................ 64
         8.13.    Other Agreements........................................... 66
         8.14.    Waiver of Jury Trial....................................... 67



<PAGE>


                                      -vi-

                                List of Exhibits


Exhibit           Title

5.2(a)                     Reconstitution of the Board of Directors of BT


                                 List of Annexes


Annex                      Title

A                          Employee Benefits Matters
B                          Summary of Terms and  Conditions of Senior  Retention
                           ISUs,  1997  ISUs and  Converted  ISUs to Be  Granted
                           Pursuant to the Agreement and Annex A Thereto



<PAGE>


                                      -vii-

                            Glossary of Defined Terms

Definition

Acquisition Proposal..........................................  ss. 5.7(a)
ADR Depositary................................................  ss. 2.1
Agreement.....................................................  Preamble
Alternative Transaction Fee...................................  ss. 7.2(b)
Board of Directors............................................  ss. 8.12(a)
BT............................................................  Preamble
BT ADRs.......................................................  Recitals
BT ADSs.......................................................  Recitals
BT Burdensome Condition.......................................  ss. 6.3(d)
BT Disclosure Document........................................  ss.3.1(e)(ii)
BT Disclosure Schedule........................................  ss. 3.2
BT Equity Interests...........................................  ss. 3.2(i)
BT Material Contracts.........................................  ss. 3.2(l)(i)
BT Ordinary Shares............................................  Recitals
BT Permits....................................................  ss. 3.2(f)
BT Schemes....................................................  ss. 3.2(m)(ii)
BT SEC Reports................................................  ss. 3.2(d)(i)
BT Shareholder Meeting........................................  ss. 5.1(c)
BT Voting Debt................................................  ss. 3.2(b)(ii)
Business Day..................................................  ss. 8.12(b)
Cash Consideration............................................  ss.  1.8(b)
Cause.........................................................  Exh. B to
Certificates..................................................  ss. 2.2
Closing.......................................................  ss. 1.2
Closing Date..................................................  ss. 1.2
Code..........................................................  Recitals
Combined Company Burdensome Condition.........................  ss. 6.2(e)
Communications Act............................................  ss. 3.1(c)(iii)
Companies Act.................................................  ss. 3.2(b)(i)
Confidentiality Agreement.....................................  ss. 5.3
Constructive Discharge........................................ Exh. B to Annex A
Certificates..................................................  ss. 2.2
Conversion Ratio..............................................  ss. 5.8(b)
Converted ISU.................................................  ss. 5.8(d)
Covered Executives............................................  Annex A



<PAGE>


                                     -viii-


Definition

Delaware Certificate of Merger................................  ss. 1.3
DGCL..........................................................  Recitals
Disclosure Documents..........................................  ss. 5.4(b)
Dissenting Shares.............................................  ss. 2.14
Effective Time................................................  ss. 1.3
Employment Agreements.........................................  ss. 5.9(a)
ERISA.........................................................  ss. 3.1(o)(i)
ESPP..........................................................  Annex A
Exchange Act..................................................  ss. 3.1(c)(iii)
Exchange Agent................................................  ss. 2.1
Exchange Fund.................................................  ss. 2.1
Executive Retention Program...................................  Annex A
Executive Severance Program...................................  Annex A
Exon-Florio...................................................  ss. 3.1(c)(iii)
Expense Amount................................................  ss. 7.2(b)
Expenses......................................................  ss. 5.10
FCC...........................................................  ss. 3.1(c)(iii)
FCC Order.....................................................  ss. 8.12(c)
Form F-4......................................................  ss. 3.1(e)(i)
Form F-6......................................................  ss. 5.1(a)
FSA...........................................................  ss. 3.1(e)(ii)
Governmental Entity...........................................  ss. 3.1(c)(iii)
HM Government.................................................  ss. 3.2(b)(i)
HSR Act.......................................................  ss. 3.1(c)(iii)
Intellectual Property Rights..................................  ss. 3.1(r)(vii)
Investment Agreement..........................................  ss. 3.2(o)
IRS...........................................................  ss. 3.1(o)(i)
Liens.........................................................  ss. 3.1(i)
LSE...........................................................  ss. 1.3
Management Employee Bonus Program.............................  Annex A
Material Adverse Effect.......................................  ss. 8.12(d)
MCI...........................................................  Preamble
MCI Awards....................................................  ss. 5.8(f)
MCI Benefit Plans.............................................  ss. 3.1(o)(i)
MCI Burdensome Condition......................................  ss. 6.2(e)
MCI Class A Common Stock......................................  ss. 1.8
MCI Common Stock..............................................  Recitals
MCI Disclosure Schedule.......................................  ss. 3.1
MCI Equity Interests..........................................  ss. 3.1(i)



<PAGE>


                                      -ix-
                                                          Location of
                                                          Defined Term 
Definition

MCI ISUs...................................................... ss. 5.8(e)
MCI Material Contracts........................................ ss. 3.1(l)(i)
MCI Permits................................................... ss. 3.1(f)
MCI Restricted Share.......................................... ss. 5.8(d)
MCI SEC Reports............................................... ss. 3.1(d)(i)
MCI Stockholders Meeting...................................... ss. 5.1(b)
MCI Stock Option.............................................. ss. 5.8(b)
MCI Stock Option Plans........................................ ss. 3.1(b)(i)
MCI Voting Debt............................................... ss. 3.1(b)(ii)
Merger........................................................ Recitals
Merger Consideration.......................................... ss. 1.8(b)
Merger Sub.................................................... Preamble
NASDAQ........................................................ ss. 3.1(c)(iii)
1996 Program.................................................. Annex A
1997 ISUs..................................................... Annex A
1997 Options.................................................. Annex A
NYSE.......................................................... ss. 2.5(b)
Other Employee Bonus Program.................................. Annex A
Person........................................................ ss. 8.12(f)
Proxy Statement/Prospectus.................................... ss. 3.1(e)(i)
Purchase Date................................................. Annex A
Regulation 4064/89............................................ ss. 3.1(c)(iii)
Regulatory Approvals Required................................. ss. 6.3(d)
Restricted BT ADRs............................................ ss. 2.13
Required BT Vote.............................................. ss. 3.2(k)
Required Consents............................................. ss. 3.1(c)(iii)
Required MCI Votes............................................ ss. 3.1(l)
Required Regulatory Approvals................................. ss. 6.2(e)
Retention Bonus Pool.......................................... Annex A
Rights........................................................ ss. 3.1(b)(i)
Rights Agreement.............................................. ss. 3.1(b)(i)
Rule 145 Affiliates........................................... ss. 2.13
Schedule 13E-3................................................ ss. 5.1(a)
Securities Act................................................ ss. 2.13
Second Dividend............................................... ss. 1.8(c)
Senior Retention ISUs......................................... Annex A
Special Share................................................. ss. 3.2(b)(i)
Stock Consideration........................................... ss. 1.8(b)
Subsidiary.................................................... ss. 8.12(g)



<PAGE>


                                       -x-



                                                          Location of
                                                          Defined Term
Definition

Superior Proposal............................................   ss. 5.7(a)
Surviving Corporation........................................   ss. 1.1
Tax..........................................................   ss. 8.12(h)
Taxable......................................................   ss. 8.12(h)
Tax Return...................................................   ss. 8.12(h)
Terminating BT Breach........................................   ss. 7.1(h)
Terminating MCI Breach.......................................   ss. 7.1(g)
Termination Date.............................................   ss. 7.1(b)
Termination Fee..............................................   ss. 7.2(b)
the other party..............................................   ss. 8.12(e)
U.K. GAAP....................................................   ss. 3.2(d)(i)
U.S. GAAP....................................................   ss. 3.1(d)(i)
Violation....................................................   ss. 3.1(c)(ii)




<PAGE>






             





                          AGREEMENT AND PLAN OF MERGER


                          dated as of November 3, 1996


                                      among



                         BRITISH TELECOMMUNICATIONS plc,

                         MCI COMMUNICATIONS CORPORATION

                                       and

                              TADWORTH CORPORATION



















<PAGE>



                




                 Reconstitution of the Board of Directors of BT



The Board of Directors of BT, as of the  Effective  Time,  shall  consist of the
following persons:


         Sir Iain Vallance
         Bert C. Roberts, Jr.
         Sir Peter Bonfield
         Gerald H. Taylor
         Sir Colin Marshall
         Douglas L. Maine
         Robert P. Brace

and eight other  members,  four of whom shall be designated by BT from among the
directors  of BT and four of whom  shall be  designated  by MCI from  among  the
directors of MCI;  provided  that the persons  designated by each party shall be
reasonably acceptable to the other party.

If prior to the Effective Time, any of Messrs.  Roberts,  Taylor or Maine or any
other person designated by MCI shall decline or be unable to serve as a director
of BT, MCI shall designate another person who is a then current director of MCI;
provided that such  designated  person shall be reasonably  acceptable to BT. If
prior to the Effective  Time,  any of Messrs.  Vallance,  Bonfield,  Marshall or
Brace or any other person  designated  by BT shall decline or be unable to serve
as a director of BT, BT shall  designate  another  person who is a then  current
director  of BT;  provided  that  such  designated  person  shall be  reasonably
acceptable to MCI.








<PAGE>


                                       A-1


                                     ANNEX A

                            EMPLOYEE BENEFITS MATTERS


         MCI and BT agree to the following with respect to the  compensation and
benefits programs of MCI and its Subsidiaries:


                  1. Executive  Severance  Program.  Effective as of the date of
         this Agreement, MCI shall establish an executive severance program (the
         "Executive  Severance  Program") for the benefit of approximately 20 of
         its senior executive  officers (other than those eight  individuals who
         are entering into Employment  Agreements)  (the "Covered  Executives").
         The Executive Severance Program shall have the terms and conditions set
         forth in Exhibit A to this Annex A.

                  2. Retention  Bonuses for Senior  Executives.  Effective as of
         the date of this  Agreement,  MCI shall  establish  a  retention  bonus
         program (the "Executive Retention Program") for the benefit of up to 80
         key  executives  (including  those 8 executives  who are entering  into
         Employment  Agreements  and  each  of  the  Covered  Executives).   The
         Executive Retention Program shall provide for the granting of retention
         bonuses in the form of incentive stock units of MCI ("Senior  Retention
         ISUs")  entitling the holders to receive up to 3,035,000  shares of MCI
         Common  Stock  in  the  aggregate.  The  Senior  Retention  ISUs  shall
         otherwise  have the terms and  conditions  specified in Annex B to this
         Agreement.

                  3. Retention Bonuses for Management Employees. Effective as of
         the date of this  Agreement,  MCI shall  establish  a  retention  bonus
         program (the "Management Employee Bonus Program") for the benefit of up
         to 150 of  its  management  employees  who  do not  participate  in the
         Executive  Retention  Program.  The  Management  Employee Bonus Program
         shall  provide  for the  payment  of cash  bonuses,  as  follows:  each
         participant  shall  receive,  as  promptly  as  practicable  after  the
         Effective  Time,  a cash  bonus  in an  amount  equal  to  50% of  such
         management  employee's  base salary as of the Effective Time. Each such
         participant  shall  receive  a  second  cash  bonus  as  of  the  first
         anniversary  of the  Effective  Time in an amount  equal to 50% of such
         employee's  base  salary.  Such  bonuses  will  not be  payable  to any
         participant  whose  employment  terminates  for any reason other than a
         termination  by MCI  without  "cause"  (as defined in Exhibit B to this
         Annex A ("Exhibit B")) on or prior to the applicable payment date.

     4. Retention Bonuses for Other Employees.  Effective as of the date of this
Agreement,  MCI shall  establish a retention  bonus program (the "Other Employee
Bonus Program") for the benefit of up to 200 of its management  employees who do
not participate in the Executive  Retention  Program or the Management  Employee
Bonus Program. The Other Employee Bonus Program shall provide for the payment

<PAGE>


                                       A-2

         of cash bonuses as follows: each participant shall receive, as promptly
         as  practicable  after the  Effective  Time,  a cash bonus in an amount
         equal to 25% of such  participant's  base  salary  as of the  Effective
         Time. Each such participant shall receive a second cash bonus as of the
         first  anniversary  of the Effective  Time in an amount equal to 25% of
         such  employee's  base salary.  Such bonuses will not be payable to any
         participant  whose  employment  terminates  for any reason other than a
         termination  by MCI  without  "cause"  (as  defined in Exhibit B) on or
         prior to the applicable payment date.

                  5.  Discretionary  Retention  Bonus Pool.  Effective as of the
         date of this Agreement, MCI shall establish, in consultation with BT, a
         discretionary  retention bonus pool (the  "Retention  Bonus Pool") in a
         budgeted  amount of up to $100 million,  to be utilized for purposes of
         retaining  and   incentivizing   key  employees  (other  than  those  8
         individuals who are entering into Employment  Agreements,  and it being
         understood  that it is intended that the Covered  Executives  generally
         will not be eligible to participate). The Retention Bonus Pool shall be
         awarded to participating key employees as follows:  (i) up to 1/3 shall
         be  awarded  during  the  period  commencing  as of the  date  of  this
         Agreement and ending as of the Effective  Time, (ii) up to 1/3 shall be
         awarded during the one-year period  commencing as of the Effective Time
         and  (iii) up to 1/3  shall  be  awarded  during  the  one-year  period
         commencing as of the first anniversary of the Effective Time; provided,
         however,  that the  allocation of the  Retention  Bonus Pool among such
         periods may be altered if necessary to reflect MCI's business needs.

                  6. 1997 and 1998 ISUs.  During 1997, MCI shall grant incentive
         stock units of MCI (the "1997 ISUs") in  accordance  with the incentive
         program  in  effect  prior to the  date of this  Agreement  (the  "1996
         Program"),  and with an aggregate  value  (determined as of the date of
         grant) of approximately $30 million. The 1997 ISUs shall have the terms
         and conditions specified in Annex B to this Agreement. It is understood
         that  it is  the  intention  of MCI to put  into  effect  a  short-term
         incentive  compensation program in 1997 comparable to the 1996 Program,
         under which awards may be payable in the form of incentive  stock units
         of MCI. Any such incentive stock units shall have terms consistent with
         the 1997 ISUs, and shall be awarded by MCI in consultation with BT.

                  7. 1997  Options.  During 1997,  MCI shall grant,  pursuant to
         MCI's Stock Option  Plan,  options to purchase up to an aggregate of 14
         million   shares  of  MCI  Common   Stock  (the  "1997   Options")   to
         approximately  7,000  employees of MCI. The 1997 Options  shall vest in
         equal annual  installments on each of the first three  anniversaries of
         the date of grant;  provided,  however, that the unvested portion of an
         optionee's 1997 Options shall become fully vested in the event that the
         employment of such optionee is terminated  without  "cause" (as defined
         in  Exhibit  B).  All  1997  Options  that  are  outstanding  as of the
         Effective  Time shall be treated  in the  manner  specified  in Section
         5.8(b) of the Agreement.


<PAGE>


                                       A-3


                  8. MCI 1990 Stock  Purchase  Plan. MCI shall take such actions
         as are  necessary  to cause  any Offer (as such term is used in the MCI
         1990 Stock Purchase Plan (the "ESPP")) to expire as of the last trading
         day on which the MCI  Common  Stock is quoted  on the  NASDAQ  National
         Market  immediately  prior to the Effective Time (the Purchase  Date");
         provided,  however,  that such  change  shall be  conditioned  upon the
         consummation  of the Merger.  On the Purchase Date, MCI shall apply the
         funds credited as of such date under the ESPP within each participant's
         payroll  withholdings  account to the  purchase of whole  shares of MCI
         Common Stock in accordance with the terms of the ESPP, and shall return
         any residual cash.

                  9.   Establishment  of  Compensation  and  Benefits  Programs.
         Following  the date of this  Agreement,  BT and MCI shall  undertake  a
         review of the compensation  and benefits  programs for employees of MCI
         and its Subsidiaries, and shall cooperate to determine the compensation
         and benefits programs that will be implemented for employees of MCI and
         its  Subsidiaries  as of and following  the  Effective  Time. It is the
         intention  of the parties to work  together to  establish  new long and
         short-term  incentive  compensation and other employee benefit programs
         for employees of MCI and its  Subsidiaries  as of the  Effective  Time.
         Such  programs are intended to be  competitive  within the industry and
         the locales in which MCI conducts its  business,  and,  with respect to
         long  and  short-term  incentive   compensation  programs,  to  reflect
         (subject  to  applicable   requirements)   the   important   role  that
         equity-based  compensation  arrangements  have  played  in the  overall
         compensation  philosophy of MCI. Such programs shall  provide,  through
         the  second  anniversary  of the  date of this  Agreement,  a level  of
         benefits that is comparable in the aggregate to that provided under the
         MCI Benefit  Plans as in effect  immediately  prior to the date of this
         Agreement.  BT and MCI will discuss in general  terms the approach that
         will be taken with respect to MCI's  compensation and benefits programs
         (including any compensation  and benefits  programs to be adopted prior
         to the Effective  Time),  and the manner in which such programs will be
         implemented in practice.  Notwithstanding the foregoing,  to the extent
         that the existing MCI Benefit Plans,  including the ESPP, have not been
         replaced by new compensation and benefits  programs as of the Effective
         Time,  such MCI  Benefit  Plans  will  continue  in effect  until  such
         replacement  programs have been  finalized  or, if earlier,  the second
         anniversary  of the date of this  Agreement;  provided,  however,  that
         changes  may be made to any such MCI  Benefit  Plans that  continue  in
         effect to reflect applicable requirements.

                  10. Employment Agreements and Retention Arrangements. From and
         after the Effective Time, BT shall honor, and shall cause the Surviving
         Corporation  to honor in accordance  with their terms,  all  employment
         agreements and retention arrangements with current and former employees
         of  MCI  and  its  Subsidiaries,  to the  extent  such  agreements  and
         arrangements  are to be  entered  into or adopted  by MCI  pursuant  to
         Section 5.9(a) of the Agreement or this Annex A.




<PAGE>
                    Exhibit A to Annex A





<PAGE>



               

         For purposes of Annexes A and B to the Merger Agreement,  the following
terms are defined as set forth below:

ISU Holders.

     Cause. For purposes of the Converted ISUs and the 1997 ISUs,  "Cause" shall
mean (i) "Cause" as defined in the  participant's  employment  agreement,  or if
applicable to such participant,  the Executive Severance Program,  and (ii) with
respect to any other participant,:

     (a) a  deliberate  and  material  act or omission by the  participant  with
respect to the participant's duties and  responsibilities  with MCI that results
in demonstrable  harm to MCI, which act or omission is (A) either the product of
willful  malfeasance  or gross  neglect,  (B)  committed in bad faith or without
reasonable  belief that such act or omission is in, or not contrary to, the best
interests  of MCI and (C) not remedied  within 30 days after  receipt of written
notice from MCI specifying such breach, or

     (b)  the   participant's   plea  of  guilty  or  nolo   contendere  to,  or
nonappealable  conviction of, a felony, which conviction or plea causes material
damage to the reputation or financial position of MCI.

Constructive Discharge.
     For  purposes  of the  Converted  ISUs  and the  1997  ISUs,  "Constructive
Discharge"  shall  mean  (i)  "good  reason"  as  defined  in the  participant's
employment  agreement  or, if  applicable  to such  participant,  the  Executive
Severance  Program,  and  (ii)  with  respect  to  any  other  participant,  the
occurrence of any of the following  without the  participant's  express  written
consent:

     (a) The assignment to the participant of any duties materially inconsistent
with the participant's current position, duties or responsibilities with MCI and
its subsidiaries to the detriment of the participant, provided that no change in
- -------- the participant's position, duties or responsibilities that occurs as a
result of MCI no longer being a public  company or becoming a  subsidiary  after
the Merger shall constitute Constructive Discharge hereunder; or

<PAGE>




     (b) A  material  reduction  in the sum of the  participant's  base  salary,
target annual bonus and long-term incentive, as such salary and incentive may be
increased from time to time;
                              
     provided,  however,  that an event  specified in (a) or (b) above shall not
constitute  "Constructive  Discharge"  if it is  remedied  within 30 days  after
receipt of written notice from the participant specifying such event.

     Optionholders;  Management  Employee Bonus Program and Other Employee Bonus
Program.
                  With  respect to options  held by employees of MCI not holding
Converted  ISUs or 1997 ISUs (and  bonuses to be paid to  employees of MCI under
the Management  Employee Bonus Program and Other  Employee Bonus  Program),  the
concept of Constructive  Discharge shall not apply and the definition of "Cause"
set forth below shall apply.

                  Cause.   "Cause" shall mean:

     (1) a failure by the employee to perform his or her  employment  duties and
responsibilities with MCI; or
                                  
     (2) the employee's plea of guilty or nolo  contendere to, or  nonappealable
conviction of, a felony.



<PAGE>





                                     ANNEX B

            SUMMARY OF TERMS AND CONDITIONS OF SENIOR RETENTION ISUs,
                   1997 ISUs AND CONVERTED ISUs TO BE GRANTED
                  PURSUANT TO THIS AGREEMENT AND ANNEX A HERETO


1.       In General

         o        All MCI ISUs will be granted pursuant to the MCI 1989 Stock 
                  Option Plan.

         o        Each  MCI  ISU  will   entitle   the   holder  to  receive  an
                  unrestricted,  fully transferable share of MCI Common Stock as
                  of  the  applicable   payment  date  specified  in  the  award
                  agreement,  or cash in the  event the ISU is  deferred  by the
                  holder and diversified into fixed income or equity investments
                  offered by MCI.

         o        MCI ISU's will vest on the terms and conditions described 
                  below.

         o        In the event of a termination  of the holder's  employment for
                  any reason,  any MCI ISUs that have not previously vested (and
                  which do not vest by reason of such termination,  as described
                  below) will be forfeited and cancelled.

         o        MCI ISUs will not be transferable other than by will or the 
                  laws of descent and distribution.

         o        The Cash  Consideration  that would have been paid to a holder
                  of an MCI ISU  pursuant  to Section  5.8(e) of this  Agreement
                  shall,  at the  election  of the  holder,  be  credited  to an
                  account  providing for deferral  into certain  equity or fixed
                  income investments offered by MCI.

         o        Payment in respect of an MCI ISU will be subject to applicable
                  withholding taxes.

         o        All MCI ISUs that remain  outstanding as of the Effective Time
                  will be treated in the manner  specified in Section  5.8(e) of
                  this Agreement.

2.       Converted ISUs

         o        Each  Converted ISU will vest in accordance  with the original
                  vesting  schedule  for  the  related  MCI  Restricted   Share;
                  provided,  however,  that each such  Converted ISU will become
                  100%  vested  on the  third  anniversary  of the  date of this
                  Agreement.



<PAGE>


                                       B-2
         o        Upon a termination  of the holder's  employment,  the unvested
                  portion of such holder's Converted ISUs will only be forfeited
                  in the event that such  termination  is for  "cause,"  or such
                  holder's  resignation is not due to  "constructive  discharge"
                  (as such terms are defined in Exhibit B); each such  Converted
                  ISU would fully vest upon any other  termination of employment
                  (including death or disability).

         o        Each  Converted ISU will provide for the payment,  deferral or
                  reinvestment,  at the holder's  election pursuant to a program
                  established  by MCI prior to the  Effective  Time, of dividend
                  equivalents  equal to the amount of any  dividends  that would
                  have been paid to the holder  thereof  following the Effective
                  Time  had the BT ADSs  underlying  such  Converted  ISUs  been
                  issued and outstanding on the applicable dividend record date.

3.       Senior Retention ISUs

         o        Each Senior  Retention ISU will vest over three years:  1/3 as
                  of the Effective  Time,  1/3 on the first  anniversary  of the
                  Effective  Time  and  1/3 on  the  second  anniversary  of the
                  Effective Time.

4.       1997 ISUs

         o        Each 1997 ISU will vest in equal annual  installments  on each
                  of the first three anniversaries of the date of grant.

         o        Upon a termination  of the holder's  employment,  the unvested
                  portion of such  holder's  1997 ISUs will only be forfeited in
                  the event that such  termination  is for  "cause,"  or if such
                  holder's  resignation is not due to  "constructive  discharge"
                  (as such terms are  defined in Exhibit  B); each such 1997 ISU
                  would  fully  vest upon any other  termination  of  employment
                  (including death or disability).

         o        Each  1997 ISU  will  provide  for the  payment,  deferral  or
                  reinvestment,  at the holder's  election pursuant to a program
                  established  by MCI prior to the  Effective  Time, of dividend
                  equivalents  equal to the amount of any  dividends  that would
                  have been paid to the holder  thereof  following the Effective
                  Time had the BT ADSs underlying such 1997 ISUs been issued and
                  outstanding on the applicable dividend record date.








MCI AND BT ANNOUNCE LARGEST INTERNATIONAL MERGER IN HISTORY

Move Creates First Global Communications Company For the 21st Century

     WASHINGTON, DC, November 3, 1996 - British Telecommunications plc (BT), the
U.K.-based  telecom giant,  and MCI, the second largest U.S.  telecommunications
company and the world's third largest  international  carrier,  today  announced
that they have signed a definitive merger agreement.

     The merger combines the substantial financial resources and global position
of BT with the growth  momentum  and  competitive  market  expertise of MCI. The
combined company will be headquartered in London and Washington,  D.C., and will
be called Concert.

     Under the  terms of the  agreement,  at  closing,  each MCI  share  will be
converted into .54 of a Concert American  Depository Share (ADS),  equivalent to
 .54 of a BT ADS, plus $6.00 in cash. The stock portion of the consideration will
be tax free to MCI  shareholders.  The merger agreement has been approved by the
Boards
of Directors of both companies.

     As part of the BT shareholder  vote  approving the merger,  Concert will be
authorized  to purchase  up to 10 percent of its  outstanding  shares  after the
closing.

     The Board of Directors of Concert will comprise fifteen members, eight from
BT and seven from MCI. The Board will be jointly  chaired by Sir Iain  Vallance,
the current chairman of BT, and Bert C. Roberts,  the current chairman and chief
executive  officer of MCI. Sir Peter Bonfield will be Concert's  chief executive
officer.  Gerald H.  Taylor will be  president  and chief  operating  officer of
Concert.  Messrs.  Bonfield  and Taylor  will  comprise  the Office of the Chief
Executive Officer.

     Six members of the Concert Board of Directors will be from management --
three
from BT (Sir Iain Vallance, Sir Peter Bonfield and Robert Brace), and three from
MCI (Bert C. Roberts, Gerald H. Taylor and Douglas L. Maine).

     This merger creates the world's first global  communications  company, with
trans--global  customers,  a multinational  management team, dual  transatlantic
headquarters and shares traded on three stock exchanges globally.

     This communications powerhouse will have revenues of over $42 billion, cash
flow of $12 billion and 183,000  employees  who support 43 million  business and
residential  customers  in 72  countries.  Based on the most  recent  fiscal net
income  of  both  companies,  the  combined  company  would  be the  sixth  most
profitable in the world.

     The decision to merge MCI and BT follows the investment by BT in 20 percent
of MCI in 1993 and the  creation of the Concert  Communications  Services  joint
venture between the two companies. The joint venture has been touted by industry
analysts as having a one-year  lead over its  competitors  in  providing  global
services  and  solutions  to  the  world's  multinational   companies.   Concert
Communications Services has sold more than $1.5 billion in contract revenue, and
recently  announced  that it would  break even one full year  ahead of  original
forecasts.

     The new merged  company  will  provide  an  integrated  set of local,  long
distance, and international  services including voice, data, wireless,  Internet
and intranet,  information technologies and outsourcing.  Under the terms of the
agreement,  MCI and BT will continue to sell and service  customers  under their
own names in their respective home countries.  MCI will continue to aggressively
support the opening of the U.S. local telecommunications market.

     Sir Iain Vallance, Chairman of BT said: "Concert will be exceptionally well
placed to play a leading role in the major  growth areas of the changing  global
communications marketplace. The complementary strengths and skills of BT and MCI
will  enable  Concert to take full  advantage  of the  tremendous  opportunities
provided by the forthcoming  liberalization of telecommunications markets in the
U.S.  and Europe.  We believe this merger will  provide  major  benefits for the
shareholders, customers and employees of both BT and MCI."

     Bert Roberts, Chairman and CEO of MCI, said: "This merger creates the first
telecommunications   company  of  the  new  century.  Financial  muscle,  global
customers and brands, and customer-driven  innovation will trump the competition
as we open up  communications  markets both  domestically  and around the world.
Concert's scale will allow it to pursue major opportunities in new markets while
maintaining  the financial  stability that comes from strong core  businesses in
the developed markets of the U.S. and U.K."

Organization

     Concert will be managed by current MCI and BT executives.  Reporting to the
Office of the CEO will be:  Timothy  F.  Price,  president  and chief  operating
officer,  MCI Communications;  Alfred T. Mockett,  president and chief operating
officer,  International  Operations;  Scott Ross,  president and chief operating
officer,  Systems  Integration;  Robert  Brace,  president  and chief  operating
officer,  Operating  Alliances.  BT (UK)  will  continue  to  operate  under the
management of Sir Peter Bonfield.

     Also  reporting  to the Office of the CEO will be Douglas L.  Maine,  chief
financial  officer;  Michael  J.  Rowny,  Strategy  Development;   Colin  Green,
secretary and chief legal  counsel;  Michael H.  Salsbury,  general  counsel and
deputy secretary;  Fred M. Briggs, chief technology officer;  John Steele, Human
Resources; Rupert Gavin, Multimedia; and Andy Green, Mobility.

Significant Benefits to Merger

     The merger creates a first-of-its-kind  global  telecommunications  company
and is expected to bring major  benefits to its  customers by providing  greater
reach,  integrated  end-to-end  services  and the  combined  strength of the two
global  companies.  The merged companies already address the biggest and fastest
growth  markets in the world,  including  the local  market in both the U.S. and
Europe,    European   and   U.S.   wireless,    global   systems    integration,
Internet/intranet and international services.

     For MCI,  financial  strength and stability are essential as it pursues the
U.S.   local   telecommunications   market,   opened  to   competition   by  the
Telecommunications  Act of 1996.  This market is the largest and most profitable
segment of the U.S.  market and  represents the company's  largest  opportunity,
with  annual  revenues  of nearly  $100  billion  and  EBITDA  (earnings  before
interest,  tax,  depreciation and amortization) of $43 billion.  In this market,
MCI  will   benefit   from  BT's   90-year   experience   in   providing   local
telecommunications services.

     BT's  broad  range of  international  relationships  around  the world will
enable Concert to capture an increasing share of the rapidly growing global
telecommunications market.

     Concert will capitalize on MCI's tremendous growth record. In the last five
years,  MCI has captured over 40 percent of the growth in the U.S. long distance
market.  BT will gain access to the North  American  telecommunications  market,
which  represents  40 percent of the  world's  international  telecommunications
traffic. In addition,  Concert will take advantage of MCI's expertise and proven
success in opening up new markets to competition.

     Both companies  have  significant  investments in intelligent  networks and
information technology. This technology will be shared by the companies and used
to develop new  services for  multinational  customers.  With this  merger,  the
companies  will combine  their  international  networks  and expect  significant
synergies from common technology platforms.

Financial Impacts

     The  combined  company  will be  financially  powerful.  Concert's  initial
leverage ratio of debt to total  capitalization after the merger and the special
dividend is expected to be  approximately  40 percent.  Concert  will be able to
maintain substantial capital expenditures in existing operations and will invest
for growth in new markets,  while maintaining a competitive dividend policy, the
ability to repurchase shares and reduce leverage over time.

Additional Revenues and Reduced Costs

     Immediate   opportunities   will  be  created   for   significant   revenue
enhancements  and savings in operating  costs and capital  expenditure.  The two
companies  are  targeting  cumulative  synergy  benefits  arising  from  a  full
integration  of the two  businesses at  approximately  $2.5 billion  within five
years following the closing of the merger.  Annual pre-tax synergy  benefits are
estimated at nearly $850  million by the fifth year  following  the merger.  The
transaction is expected to use purchase accounting.

Dividends

     Dividends will continue to be an important  component of shareholder value.
BT's dividend policy will not be affected by the merger.  BT's directors believe
that its earnings and cash flow will  continue to be strong  enough to support a
growing dividend,  as adjusted for the effect of the special dividend (valued at
$3.6  billion),  although the policy will be to grow earnings at a higher level,
which would lead to an increase in dividend  cover over time.  Provided that the
merger closes before March 31, 1998, MCI  shareholders  will receive in full the
BT dividend for that year.

Interim Activities

     In   addition   to  his   current   duties,   Bert   Roberts   will  assume
responsibilities for the management and oversight of the integration planning of
the global  activities of the two  companies'  international  and  correspondent
activities,
including Concert Communications Services.

 Board Appointments

     Gerald H. Taylor,  president and chief  operating  officer of MCI, has been
elected to the Board of Directors of BT. He joins Bert  Roberts,  who has been a
member of the BT board since 1993.

     MCI has elected to its board of directors Sir Colin  Marshall,  Chairman of
British Airways and Keith Oates,  deputy  chairman,  Marks & Spencer,  plc. They
join Sir Peter Bonfield as the three BT members of the MCI Board of Directors.

Financial and legal advisors

     MCI was advised by Lazard Freres & Co. and the law firm of Simpson, Thacher
& Bartlett.  The Board of  Directors  of MCI  received a fairness  opinion  from
Lazard in connection with the proposed transaction.

     MCI, headquartered in Washington, D.C., provides a full range of integrated
communication services to more than 20 million customers.  Credited with opening
up the U.S. long distance market for competition,  MCI is now leading the charge
to bring  competition  to the  $100  billion  local  market,  offering  American
consumers  for the first time the freedom to choose  their local  carrier.  With
quarterly annualized revenue of more than $18 billion, MCI is one of the largest
and fastest growing telecommunication companies in the world.





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