Document:

EXHIBIT 12
To:      Amerada Hess Corporation ("Amerada Hess")

and      Goldman Sachs International ("Goldman Sachs")

                                                                 5 November 2000

Dear Sirs,

Amerada Hess is  proposing to make a general  offer to acquire all of the issued
and to be issued  ordinary  shares of LASMO plc ("LASMO")  substantially  on the
terms of the attached draft press announcement (the "Press Announcement").

In  consideration  of  Amerada  Hess  agreeing  to make the  Offer on the  basis
specified in paragraph 5, Electrafina S.A. ("Electrafina") has entered into this
agreement with each of Amerada Hess and Goldman Sachs.

1.       Shareholdings

Electrafina represents and warrants to Amerada Hess that:

(a)      Electrafina  is the sole  registered  holder of the number of  ordinary
         shares  of  25p  in  LASMO  referred  to in the  Schedule  (the  "LASMO
         Shares");

(b)      Electrafina  holds its  interests  in the LASMO Shares and has power to
         sell and  transfer the LASMO Shares under the Offer free from any lien,
         charge,  option,  equity or  encumbrance  and free from any third party
         right or interest;

(c)      neither  Electrafina nor any of its  subsidiaries  has entered into any
         undischarged  contract  or  arrangement  under  which it is required to
         dispose of any interest in the LASMO Shares;

(d)      Electrafina has full power and authority to enter into this undertaking
         and to  perform  its  obligations  under  it  without  the need for any
         sanction or permission from any third party.

2.       Dealings

2.1  Electrafina  undertakes to Amerada Hess that, from (and including) the date
of this  agreement to (and  including) the date on which the Offer becomes or is
declared  wholly  unconditional,  it will not (other than by  acceptance of this
Offer) sell any LASMO Shares or any interest therein;

3.       Acceptance of the Offer

3.1      Electrafina undertakes to Amerada Hess that it will:

(a)      accept the Offer,  in  accordance  with the relevant  provisions of the
         document to be despatched on terms and conditions  consistent  with the
         Press  Announcement  to LASMO  shareholders  containing  the Offer (the
         "Offer Document"),  in respect of all the LASMO Shares and will perform
         the agreement to which that  acceptance  gives rise, in accordance with
         the relevant provisions of the Offer Document;

(b)      not withdraw any acceptances of the Offer.

3.2 The  acceptances  of the Offer  which  Electrafina  is obliged to deliver or
cause to be delivered  pursuant to paragraph  3.1 will be delivered by not later
than 4.00 p.m.  on the day  falling  twenty one days after the date of the Offer
Document.

4.       Voting Rights

4.1 From (and  including) the date of this  undertaking  to (and  including) the
date on which the Offer ceases to be open for acceptance:

(a)      Electrafina  will  exercise  the voting  rights  attached  to its LASMO
         Shares  and any  Further  LASMO  Shares on a  Relevant  Resolution  (as
         defined  in  paragraph  4.3) only in  accordance  with  Amerada  Hess's
         directions; and

(b)      Electrafina  will exercise the rights attaching to its LASMO Shares and
         any  further  LASMO  Shares  in  order  to   requisition   or  join  in
         requisitioning  any general or class meeting of  shareholders  of LASMO
         for the purposes of  considering a Relevant  Resolution  and to require
         LASMO pursuant to section 376 Companies Act 1985 to give notice of such
         a resolution only in accordance with Amerada Hess's directions.

4.2 For the purpose of casting  votes or causing  votes to be cast on a Relevant
Resolution pursuant to paragraph 4.1,  Electrafina will cause to be executed and
delivered  to Amerada Hess  promptly any form of proxy  required by Amerada Hess
appointing a person nominated by Amerada Hess to attend and vote at the relevant
general meeting of LASMO.

4.3      A "Relevant Resolution" means:

(a)      a resolution  (whether or not  amended)  proposed at a general or class
         meeting of  shareholders  of LASMO,  or at an  adjourned  meeting,  the
         passing of which is necessary to implement  the Offer or the passing of
         which or failure to pass which  might  result in any  condition  of the
         Offer not being fulfilled or which might impede or frustrate the Offer;

(b)      a resolution to adjourn a general or class meeting of  shareholders  of
         LASMO the business of which includes the  consideration of a resolution
         of the kind referred to in sub-paragraph (a) above; and

(c)      a  resolution  to  amend  any  resolution  of the kind  referred  to in
         sub-paragraphs (a) or (b) above.

5.       The Offer
5.1 Subject to paragraph 5.2, Amerada Hess agrees to make the Offer if the Press
Announcement is published,  with Amerada Hess's prior approval, in substantially
the form attached (or in such other form as may be agreed  between  Amerada Hess
and LASMO or as may be required to comply with the  requirements of the Panel on
Takeovers and Mergers (the  "Panel")) by not later than 6 November 2000 (or such
later date as Amerada Hess and LASMO may agree).  Approval of the release of the
Press Announcement is at Amerada Hess's absolute discretion.

5.2 Amerada Hess will not be obliged to make or proceed with the Offer if, after
the Press Announcement is published:

(a)      the Panel consents to Amerada Hess not proceeding with the Offer; or

(b)      Amerada Hess is no longer  required by the City Code on  Takeovers  and
         Mergers (the "Code") to proceed with the Offer.

5.3 Amerada Hess shall have no liability to Electrafina  for any failure to make
or  implement  the  Offer  and  Electrafina  will not be  entitled  to  specific
performance of Clause 5.1, if, in each case,  Amerada Hess has become aware that
any  condition  of the Offer as set out in the  Press  Announcement  has  become
incapable of being fulfilled.

5.4      The obligations of Electrafina under this agreement will lapse if:

(a)      the Press Announcement is not released on 6 November 2000 or such later
         date but no later than 30 November  2000 as Amerada  Hess and LASMO may
         agree; or

(b)      the Offer is not made or Amerada  Hess does not proceed  with the Offer
         in any of the circumstances referred to in paragraph 5.2.

and in those  circumstances  neither party will have any claim against the other
except in respect of any prior breach.

6.       Documentation

6.       Electrafina consents to:

(a)      the inclusion of references to  Electrafina  and this  agreement in the
         Press Announcement;

(b)      particulars of this agreement and Electrafina's  interests and dealings
         in relevant  securities of LASMO being  included in the Offer  Document
         and any other related or ancillary document,  to the extent required by
         the City Code on  Takeovers  and  Mergers  (the  "Code") or in order to
         avoid a false market in securities of LASMO or Amerada Hess; and

(c)      this  agreement  being  available for  inspection  until the end of the
         offer period (as defined in the Code).

7.       Higher Competing Offer
7.1  Electrafina's  obligations  under  paragraph 3 above will lapse if a Higher
Competing Offer is made by a third party prior to the latest time for acceptance
of the Offer (pursuant to this letter) in respect of any LASMO Shares.

7.2 For the purposes of this agreement a "Higher Competing Offer" means an offer
by a third  party  for the  fully  diluted  ordinary  shares  of 25p each in the
capital of LASMO which has a value, upon the announcement of a firm intention on
the part of the third  party to make  such  offer  (without  a  requirement  for
fulfilment  of any  precondition),  for each  share in LASMO to which it relates
which is more than 110 per  cent.  of the lower of (a) 180p and (b) the Offer as
at close of NYSE  dealing on the NYSE  dealing day  immediately  preceding  such
announcement  translating the value of Amerada Hess shares from U.S.  dollars to
sterling at the exchange rate prevailing at the time.

8.       Confirmation
Electrafina  confirms  that in relation to signing  this  agreement  it is not a
customer of Goldman  Sachs for the purposes of the Rules of The  Securities  and
Futures Authority and that Goldman Sachs does not owe it any of the duties which
it owes to its customers.

9.       Interpretation
In this  agreement  the  "Offer"  means  the offer to be made by or on behalf of
Amerada  Hess  to  acquire  ordinary  shares  of  25p in the  capital  of  LASMO
substantially on the terms of the Press  Announcement or on such terms as may be
required  to comply with the  requirements  of the Panel.  A  reference  in this
agreement to the "Offer" also includes any new, increased,  renewed, extended or
revised  offer made by or on behalf of Amerada Hess prior to the Offer  lapsing,
closing for acceptances or being withdrawn to acquire ordinary shares in LASMO.

10.      Time of the Essence
Any time,  date or period  mentioned in this agreement may be extended by mutual
agreement  but as  regards  any  time,  date or  period  originally  fixed or as
extended, time shall be of the essence.

11.      General
11.1 The obligations of Electrafina  under this agreement are without  prejudice
to any  rights  of  Amerada  Hess or  Goldman  Sachs at  common  law or  equity.
Invalidity  of any  provision  of this  agreement  will  not  affect  any  other
provision.

11.2 Any  failure  or delay by any  person in  exercising  any  right,  power or
privilege  under  this  agreement  will not  comprise  a waiver  and a single or
partial exercise will not restrict any further exercise.

11.3 This  agreement is governed by and is to be construed  in  accordance  with
English law and each of the parties submits to the exclusive jurisdiction of the
English courts for all purposes in connection with this agreement.

<PAGE>
                                    SCHEDULE

                                  LASMO Shares

Registered Holder        Beneficial Owner         Ordinary Shares of 25p
                                                  each in LASMO

Electrafina S.A.         Electrafina S.A.         98,336,161

<PAGE>

EXECUTED by ELECTRAFINA S.A. by  )        ----------------------------

GERALD FAERE                     THIERRY de RUDDER
(print name)

EXECUTED by AMERADA HESS         )        ----------------------------
CORPORATION by                   )

-------------------------------
(print name)EXHIBIT 13
To:      Amerada Hess Corporation ("Amerada Hess")

and      Goldman Sachs International ("Goldman Sachs")

                                                                 5 November 2000

Dear Sirs,

Amerada Hess is  proposing to make a general  offer to acquire all of the issued
and to be issued  ordinary  shares of LASMO plc ("LASMO")  substantially  on the
terms of the attached draft press announcement (the "Press Announcement").

In  consideration  of  Amerada  Hess  agreeing  to make the  Offer on the  basis
specified in paragraph 5, Schroders  Investment  Management  Limited ("SIM") has
entered into this agreement with each of Amerada Hess and Goldman Sachs.

1.       Shareholdings

SIM represents and warrants to Amerada Hess that:

(a)      SIM has the  power to cause to be sold and  transferred  in  accordance
         with the terms of the Offer ____ ordinary  shares of 25p in LASMO which
         are not registered in its name (the "Controlled Shares");

(b)      SIM has power to sell and  transfer  the  Controlled  Shares  under the
         Offer free from any lien,  charge,  option,  equity or encumbrance  and
         free from any third party right or interest;

(c)      except as disclosed to Amerada Hess in writing,  neither SIM nor any of
         its  subsidiaries  has entered into any contract or  arrangement  under
         which it is  required  to dispose  of any  interest  in the  Controlled
         Shares;

(d)      SIM has full power and authority to enter into this  undertaking and to
         perform its  obligations  under it without the need for any sanction or
         permission from any third party.

2.       Dealings

2.1 SIM undertakes to Amerada Hess that,  from (and  including) the date of this
agreement to (and  including) the date on which the Offer becomes or is declared
wholly unconditional,  it will not (other than by acceptance of this Offer) sell
any Controlled Shares or any interest therein;

3.       Acceptance of the Offer

3.1      SIM undertakes to Amerada Hess that it will:

(a)      take all action within its power to cause the registered  holder of the
         Controlled  Shares to accept the Offer in respect of all the Controlled
         Shares and to perform  the  agreement  to which that  acceptance  gives
         rise, in accordance with the relevant provisions of the Offer Document;

(b)      not  withdraw  any  acceptances  of the Offer and will take all actions
         within  its  power  to  procure  that  the  registered  holder  of  any
         Controlled Shares will not do so.

3.2 The  acceptances of the Offer which SIM is obliged to deliver or cause to be
delivered  pursuant to  paragraph  3.1 will be  delivered by not later than 4.00
p.m. on the day falling twenty one days after the date of the Offer Document.

3.3 If requested to do so, SIM will procure that the registered holder(s) of the
Controlled  Shares give Amerada Hess an  undertaking in the terms of paragraph 4
of this undertaking.

4.       Voting Rights

4.1 From (and  including) the date of this  undertaking  to (and  including) the
date on which the Offer ceases to be open for acceptance:

(a)      SIM will  procure  the  exercise of the voting  rights  attached to the
         Controlled  Shares on a Relevant  Resolution  (as defined in  paragraph
         4.3) only in accordance with Amerada Hess's directions;

(b)      SIM will procure the exercise of the rights attaching to the Controlled
         Shares in order to requisition or join in requisitioning any general or
         class meeting of  shareholders of LASMO for the purposes of considering
         a Relevant  Resolution  and to require  LASMO  pursuant  to section 376
         Companies  Act  1985  to  give  notice  of  such a  resolution  only in
         accordance with Amerada Hess's directions; and

(c)      SIM will ensure that the  registered  holder of any  Controlled  Shares
         will comply with sub-paragraphs (a) and (b) above.

4.2 For the purpose of casting  votes or causing  votes to be cast on a Relevant
Resolution  pursuant  to  paragraph  4.1,  SIM  will  cause to be  executed  and
delivered  to Amerada Hess  promptly any form of proxy  required by Amerada Hess
appointing a person nominated by Amerada Hess to attend and vote at the relevant
general meeting of LASMO.

4.3      A "Relevant Resolution" means:

(a)      a resolution  (whether or not  amended)  proposed at a general or class
         meeting of  shareholders  of LASMO,  or at an  adjourned  meeting,  the
         passing of which is necessary to implement  the Offer or the passing of
         which or failure to pass which  might  result in any  condition  of the
         Offer not being fulfilled or which might impede or frustrate the Offer;

(b)      a resolution to adjourn a general or class meeting of  shareholders  of
         LASMO the business of which includes the  consideration of a resolution
         of the kind referred to in sub-paragraph (a) above; and

(c)      a  resolution  to  amend  any  resolution  of the kind  referred  to in
         sub-paragraphs (a) or (b) above.

5.       The Offer
5.1 Subject to paragraph 5.2, Amerada Hess agrees to make the Offer if the Press
Announcement is published,  with Amerada Hess's prior approval, in substantially
the form attached (or in such other form as may be agreed  between  Amerada Hess
and LASMO or as may be required to comply with the  requirements of the Panel on
Takeovers and Mergers (the "Panel")) by not later than 6 November 2000. Approval
of  the  release  of  the  Press  Announcement  is at  Amerada  Hess's  absolute
discretion.

5.2 Amerada Hess will not be obliged to make or proceed with the Offer if, after
the Press Announcement is published:

(a)      the Panel consents to Amerada Hess not proceeding with the Offer; or

(b)      Amerada Hess is no longer  required by the City Code on  Takeovers  and
         Mergers (the "Code") to proceed with the Offer.

5.3  Amerada  Hess shall  have no  liability  to SIM for any  failure to make or
implement  the Offer and SIM will not be  entitled to  specific  performance  of
Clause 5.1, if, in each case,  Amerada Hess has become aware that any  condition
of the Offer as set out in the Press  Announcement has become incapable of being
fulfilled.

5.4      The obligations of SIM under this agreement will lapse if:

(a)      the Press Announcement is not released on 6 November 2000; or

(b)      the  Offer  is not  made  in any of the  circumstances  referred  to in
         paragraph 5.2.

and in those  circumstances  neither party will have any claim against the other
except in respect of any prior breach.

6.       Documentation

6.       SIM consents to:

(a)      the  inclusion  of  references  to SIM and this  agreement in the Press
         Announcement;

(b)      particulars  of this  agreement  and SIM's  interests  and  dealings in
         relevant  securities of LASMO being  included in the Offer Document and
         any other related or ancillary document,  to the extent required by the
         City Code on Takeovers  and Mergers (the "Code") or in order to avoid a
         false market in securities of LASMO or Amerada Hess; and

(c)      this  agreement  being  available for  inspection  until the end of the
         offer period (as defined in the Code).

7.       Higher Competing Offer
7.1 SIM's  obligations  under paragraph 3 above will lapse if a Higher Competing
Offer is made by a third party prior to the latest  time for  acceptance  of the
Offer (pursuant to this letter) in respect of any LASMO Shares.

7.2 For the purposes of this agreement a "Higher Competing Offer" means an offer
by a third  party  for the  fully  diluted  ordinary  shares  of 25p each in the
capital of LASMO which has a value, upon the announcement of a firm intention on
the part of the third  party to make  such  offer  (without  a  requirement  for
fulfilment  of any  precondition),  for each  share in LASMO to which it relates
which is more than 110 per cent.  of the lower of (a) 180p and (b) the  sterling
value  of the  Offer  as at  close  of NYSE  dealing  on the  NYSE  dealing  day
immediately  preceding such  announcement  translating the value of Amerada Hess
shares from U.S.  dollars to sterling at the exchange  rate  prevailing  at that
time.

8.       Confirmation
SIM confirms that in relation to signing this  agreement it is not a customer of
Goldman  Sachs for the  purposes  of the  Rules of The  Securities  and  Futures
Authority and that Goldman Sachs does not owe it any of the duties which it owes
to its customers.

9.       Interpretation
In this  agreement  the  "Offer"  means  the offer to be made by or on behalf of
Amerada  Hess  to  acquire  ordinary  shares  of  25p in the  capital  of  LASMO
substantially on the terms of the Press  Announcement or on such terms as may be
required  to comply with the  requirements  of the Panel.  A  reference  in this
agreement to the "Offer" also includes any new, increased,  renewed, extended or
revised  offer made by or on behalf of Amerada Hess prior to the Offer  lapsing,
closing for acceptances or being withdrawn to acquire ordinary shares in LASMO.

10.      Time of the Essence
Any time,  date or period  mentioned in this agreement may be extended by mutual
agreement  but as  regards  any  time,  date or  period  originally  fixed or as
extended, time shall be of the essence.

11.      General
11.1 The  obligations of SIM under this  agreement are without  prejudice to any
rights of Amerada Hess or Goldman  Sachs at common law or equity.  Invalidity of
any provision of this agreement will not affect any other provision.

11.2 Any  failure  or delay by any  person in  exercising  any  right,  power or
privilege  under  this  agreement  will not  comprise  a waiver  and a single or
partial exercise will not restrict any further exercise.

11.3  Without  prejudice  to any right to damages in respect of a breach of this
agreement,  SIM agrees that damages would not be an adequate  remedy and Amerada
Hess will be entitled to equitable  relief  (including  specific  performance or
injunction)  if there is a  threatened,  actual or  anticipatory  breach of this
agreement by SIM.

11.4 This  agreement is governed by and is to be construed  in  accordance  with
English law and each of the parties submits to the exclusive jurisdiction of the
English courts for all purposes in connection with this agreement.

<PAGE>
EXECUTED by SCHRODERS INVESTMENT           )
MANAGEMENT LIMITED by                      )        J.C.O. METCALFE

- - - - - - - - - - - - - - - - - -
    (print name)

EXECUTED by AMERADA HESS                   )
CORPORATION by                             )        J. BARCLAY COLLINS

 - - - - - - - - - - - - - - - - - -
    (print name)

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