CONFORMED COPY


                              DATED 7th AUGUST 1998



                          NATIONAL WESTMINSTER BANK Plc
                                   (as Agent)

                                     - and -

                          NATIONAL WESTMINSTER BANK Plc
                                   (as a Bank)

                                     - and -

                       THE FIRST NATIONAL BANK OF MARYLAND
                                   (as a Bank)

                                     - and -

                                  COMERICA BANK
                                   (as a Bank)

                                      - and

                       HUNTINGDON LIFE SCIENCES GROUP plc


                        HUNTINGDON LIFE SCIENCES LIMITED

                                     - and -

                         HUNTINGDON LIFE SCIENCES, INC.

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

                         FOURTH INTERCREDITOR AGREEMENT
                        replacing the third Intercreditor
                                    Agreement
                       between the same parties dated 17th
                                   March 1998

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









<PAGE>




                                        TABLE OF CONTENTS


Clause        Heading                                    Page Number

1.            INTERPRETATION.................................2
2.            PRIORITIES.....................................5
3.            RISK-SHARING BY FNBM...........................6
4.            RISK-SHARING BY FNBM AND COMERICA..............8
6.            CO-OPERATION..................................10
7.            NO OBLIGATIONS TO BORROWERS...................10
9.            COUNTERPARTS..................................11
10.           LAW AND JURISDICTION..........................11

SCHEDULE      1 Participation in Risk-Sharing...............12
SCHEDULE      2 Security....................................13




<PAGE>


THIS AGREEMENT is made the 7th day of August 1998

BETWEEN:

(1)    NATIONAL WESTMINSTER BANK Plc of 3rd Floor, Juno Court, 25 Prescot
       Street, London E1 8BB (as Agent) (the "Agent");

(2)    NATIONAL WESTMINSTER BANK Plc of Phase 2, King's Cross House, 200
       Pentonville Road, London N1 9HL (as a Bank) ("NatWest");

(3)    THE FIRST  NATIONAL  BANK OF MARYLAND of 26 South  Charles  Street,
       Baltimore, MD21201, United States of America (as a Bank) ("FNBM");

(4)    COMERICA BANK (as a Bank) ("Comercia");

(5)    HUNTINGDON LIFE SCIENCES GROUP plc a company incorporated in England and
       Wales with registered number 502370 of Woolley Road, Alconbury,
       Huntingdon, Cambridgeshire PE17 5HS ("the Parent");

(6)    HUNTINGDON LIFE SCIENCES LIMITED a company incorporated in England and
       Wales with registered number 1815730 of Woolley Road, Alconbury,
       Huntingdon, Cambridgeshire PE17 5HS ("HLSL"); and

(7)    HUNTINGDON  LIFE SCIENCES,  INC. a company  incorporated  under the
       laws of the State of Delaware, USA, having its registered office at
       9 East Loockerman Street,  City of Dover,  County of Kent, State of
       Delaware, United States of America ("HLS").

WHEREAS:

(A)  By a  facilities  agreement  dated 1st  November  1995  between the
     Borrowers (1), the Banks (as defined therein) (2) and the Agent (3)
     as subsequently amended (the "Facilities Agreement") the Banks made
     available to the Borrowers certain facilities.

(B)  By various  security  agreements  and guarantees and debentures the
     Borrowers  granted security over their respective  assets in favour
     of the Agent as continuing security for their obligations under the
     Facilities Agreement.

(C)  By a facility letter dated 17th March 1998 (the "New Facility Letter")
     addressed to the Borrowers, NatWest in its capacity as the Overdraft Bank
     thereunder agreed to provide the First New Overdraft Facility and the
     Second New Overdraft Facility to the Parent and HLSL on the terms and
     conditions set out therein and FNBM and NatWest in their capacity as
     Banks agreed to share the risk incurred by NatWest as Overdraft Bank in
     providing the First New Overdraft Facility and FNBM, NatWest and
     Comerica in their capacity as Banks agreed to share the risk incurred
     on the terms and conditions as set out herein.

(D)  By  supplemental  deeds dated 26th February 1998 the Borrowers have
     extended  the  security  created by the  documents  referred  to in
     Recital B to cover all of the  obligations  and  liabilities of the
     Borrowers to the Banks howsoever incurred.

(E)  By a  facility  letter  of  today's  date (the  "Bridging  Facility
     Letter") addressed to the Borrowers, NatWest in its capacity as the
     Overdraft  Bank has agreed to provide the Bridging  Facility to the
     Parent and HLSL on the terms and  conditions  set out  therein  and
     FNBM,  Coamerica and NatWest in their capacity as Banks have agreed
     to grant super  priority to the Overdraft  Bank with respect to the
     amount outstanding at any time under the Bridging Facility.

NOW THIS AGREEMENT WITNESSES as follows:

1.     INTERPRETATION

1.1    In this  Agreement  (including  the  Recitals),  unless the context
       otherwise  requires or unless otherwise  defined or provided for in
       this Agreement,  words and expressions shall have the same meanings
       as are  attributable  to them under the  Facilities  Agreement.  In
       addition  the  following  words  and  expressions  shall  have  the
       respective meanings ascribed to them:

       "Bridging Facility" means the (pound)1,000,000 bridging facility to
       be provided by the  Overdraft  Bank by means of an overdraft on the
       current accounts of the Parent and HLSL at the Overdraft Bank;

       "First New Overdraft Facility" bears the same meaning as in the New
       Overdraft Document;

       "First New Overdraft  Outstandings" means at any time the aggregate
       amount  outstanding  by  way  of  overdraft  under  the  First  New
       Overdraft Facility;

       "First Participation Percentage" means, at any time, in relation to
       NatWest and FNBM the percentage of their  participation in the risk
       incurred by NatWest under the First New  Overdraft  Facility as set
       out in Column 2 of Schedule 1;

       "First  Super  Priority   Obligations"   means  all  moneys  owing,
       obligations  and other  liabilities  of the  Parent and HLSL to the
       Overdraft Bank under the Bridging Facility;

       "Junior Obligations" means the NatWest Obligations;

       "NatWest  Facility  Document"  means a facility  letter  dated 10th
       September  1997 (as amended by a letter dated 26th  February  1998)
       from NatWest to HLSL and the Parent in respect of overdraft,  forex
       daytime  exposure  and  terminable   indemnity   facilities  in  an
       aggregate amount of (pound)995,000;

       "NatWest  Obligations"  means  the  (pound)100,000  (plus  interest
       thereon)  owing by the Parent  and/or HLSL to NatWest in respect of
       the Residual Overdraft together with all moneys owing to NatWest in
       respect of the  terminable  indemnity  forex and daylight  exposure
       Facilities made available under the NatWest Facility Document;

       "Net  Proceeds"  means in relation to the Security the net proceeds
       of sale or other  realisation of the assets subject to the Security
       after  discharge  of all  direct  costs  incurred  in such  sale or
       realisation,  the discharge of any prior ranking  claims and, where
       appropriate,  all costs, charges, fees and expenses of any receiver
       appointed pursuant to the Security;

       "New Overdraft Document" means the facility letter dated 17th March
       1998 from NatWest as Overdraft Bank to the Borrowers;

       "Outstandings"  means in  relation  to each Bank,  at the time of a
       distribution of the Net Proceeds,  the amount owing to that Bank by
       all the Borrowers under the Facilities Agreement, and in respect of
       NatWest and FNBM also under the First New  Overdraft  Facility (and
       in calculating the  Outstandings in respect of FNBM, the Agent will
       take  into  account  FNBM's  liability  to  NatWest  under the risk
       sharing provisions contained in Clause 3 of this Agreement);

       "Priority  Obligations"  means all moneys  owing,  obligations  and
       other  liabilities  of the  Borrowers  to the  Banks  and the Agent
       pursuant  to the  Facilities  Agreement  and  under  the  First New
       Overdraft Facility;

       "Residual Overdraft" means the residual overdraft facility provided
       under the NatWest Facility Document;

       "Second New Overdraft Facility" bears the same meaning as in the New
       Overdraft Document;

       "Second New Overdraft Outstandings" means at any time the aggregate
       amount  outstanding  by way  of  overdraft  under  the  Second  New
       Overdraft Facility;

       "Second Participation Percentage" means at any time, in relation to
       NatWest, FNBM and Comerica the percentage of their participation in
       the risk  incurred  by  NatWest  under  the  Second  New  Overdraft
       Facility as set out in Column 3 of Schedule 1;

       "Security"  means all the  security  executed by the  Borrowers  in
       favour of the Agent as security  trustee  for the  Secured  Parties
       details  of  which  are  listed  in  Schedule  2 to this  Agreement
       together  with any further  security so created by the Borrowers or
       any of them;

       "Sharing  Percentages"  means in relation to each Bank a percentage
       calculated using the following formula:

       A = B x 100
             C

       A = Sharing  Percentage of the Bank in question B = Outstandings of
       the Bank in question C = Total Outstandings; and

       "Super Priority  Obligations"  means all moneys owing,  obligations
       and other  liabilities  of the Borrowers to the Overdraft  Bank and
       the Banks under the Second New Overdraft Facility; and

       "Total  Outstandings"  means,  at the time of a distribution of the
       Net Proceeds,  the  aggregate  amount owing to all the Banks by the
       Borrowers  under  the  Facilities   Agreement  and  the  First  New
       Overdraft Facility.


1.2    Interpretation

       In this Agreement, unless the context otherwise requires:

       (a)  references to any persons shall be construed so as to
            include that person's assigns, transferees or successors in title;

       (b)  references to any document (or any specified provisions
            of any  document)  shall be construed as  references to
            such  document or that  provision as amended or novated
            or supplemented  or replaced,  as the case may be, from
            time to time;

       (c)  references to the singular shall include the plural and
            vice  versa and  references  by way of male,  female or
            neuter pronoun shall include references to all genders;
            and

       (d)  references to Clauses and Schedules are to be construed
            as references to the Clauses of, and Schedules to, this
            Agreement as amended or varied from time to time.


2.     PRIORITIES

2.1    It is hereby  agreed by and between  the parties to this  Agreement
       that on  enforcement  of the  Security  the Net  Proceeds  shall be
       applied:

       (i)    first, in discharge of the First Super Priority Obligations;

       (ii)   second, in discharge of the Super Priority Obligations;

       (iii)  third, in discharge of the Priority Obligations; and

       (iv) fourth, in discharge of the Junior Obligations.

2.2    The Security is a continuing  security and the ranking of the First
       Super  Priority  Obligations,   Super  Priority  Obligations,   the
       Priority  Obligations and the Junior Obligations as provided for in
       this  Agreement  shall not be  affected by any  fluctuation  in the
       amounts from time to time of the First Super Priority  Obligations,
       Super Priority Obligations,  the Priority Obligations or the Junior
       Obligations  or by the existence at any time of a credit balance on
       any current or other accounts.

2.3    The  moneys  owing and  obligations  and other  liabilities  of the
       Overdraft  Borrowers  to the Banks in  respect  of the  Second  New
       Overdraft Facility shall rank pari passu in all respects so that on
       enforcement  the Net Proceeds shall be shared between the Banks pro
       rata  on  the  basis  of  their  respective  Second   Participation
       Percentages.

2.4    For the  avoidance of doubt it is  confirmed  that the moneys owing
       and obligations and other liabilities of the Borrowers to the Banks
       and the Agent under the  Facilities  Agreement and of the Overdraft
       Borrowers to NatWest and FNBM in respect of the First New Overdraft
       Facility  shall  rank  pari  passu  in all  respects  and  that  on
       enforcement,  after payment of the First Super Priority Obligations
       and the  Super  Priority  Obligations,  the Net  Proceeds  shall be
       shared between the Banks pro rata on the basis of their  respective
       Sharing Percentages.

2.5    In the  event  of the  Group  making  any  early  repayment  of the
       Facilities or of amounts due under the New Facility  Letter whether
       by voluntary repayment from cashflow or from the sale of any assets
       such  reduction  will be applied in accordance  with the priorities
       set out in Clause 2.1 as if they were Net Proceeds.


3.     RISK-SHARING BY FNBM

3.1.1  FNBM hereby  irrevocably  and unconditionally  agrees and undertakes to
       NatWest to indemnify  NatWest and to keep NatWest fully and  effectively 
       indemnified on demand and free of any  set-off,  counterclaim  or other 
       deductions  against  all  losses, liabilities,  costs,  charges  and 
       expenses  which  NatWest  at any time  incurs or suffers  arising  out
       of or in  connection  with  the  provision  of the  First  New
       Overdraft  Facility  (including  for the  avoidance of doubt the First
       New Overdraft Outstandings)  (other than in respect of gross  negligence 
       or wilful  misconduct on the part of NatWest)  (the  "Liabilities")
       PROVIDED THAT FNBM shall only be obliged to  indemnify  NatWest  under
       this Clause to the extent of an amount  equivalent  to
       its First Participation Percentage of the Liabilities.

3.1.2  A  certificate  of an  officer  of  NatWest as to the amount of the
       Liabilities  shall,  save in the case of manifest error, be binding
       on FNBM.

3.1.3  NatWest  shall not be obliged  to take any  action to  recover  the
       Liabilities   from  the   Borrowers   before   making   demand  for
       indemnification against FNBM under this Clause 3.1.

3.2    COUNTER-INDEMNITY BY THE BORROWERS

3.2.1  Each of the Borrowers hereby  unconditionally and irrevocably,  and
       jointly and  severally,  agree and undertake to each of NatWest and
       FNBM as follows:

   (a)  to indemnify  NatWest  and FNBM and to keep  NatWest and FNBM fully
        and effectively  indemnified  against  all  actions,  proceedings,
        claims, damages,  demands,  losses,  liabilities,  costs,  charges
        and  expenses (including,  for the  avoidance of doubt,  any such
        arising under any of the  indemnities  given by FNBM to NatWest
        under  Clause 3.1) which are  at any time brought or preferred
        against  NatWest  and/or FNBM or which either  or  both  of  them
        at  any  time  incurs  arising  out of or in
        connection with the provision of the First New Overdraft Facility;

   (b)  to pay NatWest and FNBM on demand free of all set-off,  counterclaim or
        other deductions of any nature whatsoever all payments,  losses,  costs
        and  expenses suffered  or incurred or arising in relation to the First
        New Overdraft Facility  together with  interest  thereon  calculated in
        accordance  with the  provisions  of  and  at  the  rate  specified  in
        Paragraph 6.1.1 of the New Facility  Letter which interest shall accrue
        and be payable as from the date on which such  payments, losses,  costs
        and  expenses are paid or incurred by NatWest  and/or FNBM  without the
        necessity for any demand being first made for payment thereof;  and

   (c)  that  until  all  obligations,   indebtedness  or  liabilities (whether
        actual or  contingent)  of the Borrowers  to both NatWest and FNBM have
        been  fully  and  effectively discharged  the  Borrowers  shall  not be
        entitled  to share in any  security held or money  received  by NatWest
        and/or  FNBM on account of the same or to stand in the place of NatWest
        and/or  FNBM in respect of any such security  or money or take any step
        to enforce any right or claim against the  Borrowers  in respect of any
        monies paid by the Borrowers  to NatWest  and/or  FNBM or exercise  any
        right of surety in competition  with  NatWest  and/or FNBM and that the
        obligations  of the Borrowers  under  this  Clause  3.2.1  shall not be
        discharged  nor  shall the  liability  of the  Borrowers  hereunder  be
        affected  or  reduced  by reason  of any  failure  of or  irregularity,
        defect or informality in any security nor by any legal  limitation, bar
        or restriction,  disability, incapacity or want of any borrowing powers
        of  the  Borrowers  or  want of  authority  of any  director,  manager,
        official or other  person appearing  to be acting for the  Borrowers in
        any matter in respect of the monies or  liabilities  hereby  secured or
        by  any   supervening   matters  rendering  the   performance   of  the
        obligations  of the  Borrowers illegal  in any  jurisdiction  and  such
        monies or liabilities  will be recoverable by the NatWest and FNBM from
        the Borrowers as sole or as principal debtors.

3.2.2   For the  avoidance of doubt the  Borrowers  shall not be obliged to
        pay under the  indemnity  contained  in Clause  3.2.1 any more than
        they  would  have had to pay had they made  payment  in full of all
        sums owing in respect of the First New  Overdraft  Facility and any
        costs and expenses attributable to the collection of the same.


4.       RISK-SHARING BY FNBM AND COMERICA

4.1.1    Each of FNBM and Comerica  severally hereby irrevocably and 
         unconditionally  agrees and  undertakes  to NatWest  to  indemnify 
         NatWest  and to keep  NatWest  fully and effectively  indemnified 
         on demand and free of any set-off,  counterclaim  or other
         deductions  against all losses,  liabilities,  costs,  charges  and 
         expenses  which NatWest  at any time  incurs or suffers  arising 
         out of or in  connection  with the  provision  of the Second New 
         Overdraft  Facility  (including  for the  avoidance of doubt the 
         Second  New  Overdraft Outstandings) (other  than in respect of gross
         negligence  or  wilful  misconduct  on the  part  of  NatWest)
         (the "Liabilities") PROVIDED  THAT FNBM and Comerica  shall only be
         obliged to indemnify  NatWest  under this  Clause to the  extent 
         of an  amount  equivalent  to their  respective  Second
         Participation Percentage of the Liabilities.

4.1.2    A  certificate  of an  officer  of  NatWest as to the amount of the
         Liabilities  shall,  save in the case of manifest error, be binding
         on FNBM and Comerica.

4.1.3    NatWest  shall not be obliged  to take any  action to  recover  the
         Liabilities   from  the   Borrowers   before   making   demand  for
         indemnification against FNBM and Comerica under this Clause 4.1.

4.2      COUNTER-INDEMNITY BY THE BORROWERS

4.2.1    Subject   to   Clause   4.2.2   each   of  the   Borrowers   hereby
         unconditionally and irrevocably,  and jointly and severally,  agree
         and undertake to each of NatWest, Comerica and FNBM as follows:

 (a)   to indemnify  NatWest,  Comerica and FNBM and to keep NatWest,  Comerica
        and  FNBM  fully  and  effectively   indemnified  against  all  actions,
        proceedings,  claims,  damages,  demands,  losses,  liabilities,  costs,
        charges and expenses  (including,  for the avoidance of doubt,  any such
        arising  under  any  of the  indemnities  given  by  FNBM,  Comerica  to
        NatWest  under  Clause 4.1) which are at any time  brought or  preferred
        against  NatWest  and/or  Comerica  and/or  FNBM or which  any or all of
        them  at any  time  incurs  arising  out of or in  connection  with  the
        provision of the Second New Overdraft Facility;

 (b)   to pay  NatWest,  Comerica  and  FNBM on  demand  free  of all  set-off,
        counterclaim   or  other   deductions  of  any  nature   whatsoever  all
        payments,  losses,  costs and  expenses  suffered or incurred or arising
        in  relation  to  the  Second  New  Overdraft   Facility  together  with
        interest  thereon  calculated in accordance  with the  provisions of and
        at the rate  specified  in Paragraph  6.1.1 of the New  Facility  Letter
        which  interest  shall  accrue  and be payable as from the date on which
        such  payments,  losses,  costs and  expenses  are paid or  incurred  by
        NatWest  and/or  Comerica  and/or  FNBM  without the  necessity  for any
        demand being first made for payment thereof;  and

(c)    that until all obligations, indebtedness or liabilities (whether actual
       or contingent) of the Borrowers to each of NatWest, Comerica and FNBM
       have been fully and effectively discharged the Borrowers shall not be
       entitled to share in any security held or money received by NatWest
       and/or Comerica and/or FNBM on account of the same or to stand in the
       place of NatWest and/or Comerica and/or FNBM in respect of any such
       security or money or take any step to enforce any right or claim against
       the Borrowers in respect of any monies paid by the Borrowers to  NatWest
       and/or Comerica and/or FNBM or exercise any right of surety in
       competition with NatWest and/or Comerica and/or FNBM and that the
       obligations of the Borrowers under this Clause 4.2.1 shall not be
       discharged nor shall the liability of the Borrowers hereunder be
       affected or reduced by reason of any failure of or irregularity,
       defect or informality in any security nor by any legal limitation,
       bar or restriction, disability, incapacity or want of any borrowing
       powers of the Borrowers or want of authority of any director, manager,
       official or other person appearing to be acting for the Borrowers in
       any matter in respect of the monies or liabilities hereby secured or
       by any supervening matters rendering the performance of the obligations
       of the Borrowers illegal in any jurisdiction and such monies or
       liabilities will be recoverable by the NatWest and Comerica and FNBM
       from the Borrowers as sole or as principal debtors.

4.2.2  For the  avoidance of doubt the  Borrowers  shall not be obliged to
       pay under the  indemnity  contained  in Clause  4.2.1 any more than
       they  would  have had to pay had they made  payment  in full of all
       sums owing in respect of the Second New Overdraft  Facility and any
       costs and expenses attributable to the collection of the same.


5.     MAKING DEMAND

       Each of the Banks hereby agrees with the other Bank that NatWest in
       its capacity as Agent and as Overdraft Bank shall not and shall not
       be obliged to make any demand for  repayment of the  Facilities  or
       the Overdraft  Facilities or the Bridging  Facility  without having
       obtained the prior written authority of all of the Banks.


6.     CO-OPERATION

       The Agent and the Banks shall  co-operate to ensure that any moneys
       in  the  hands  of a  receiver  appointed  pursuant  to  any of the
       Security are distributed in a manner consistent with the provisions
       of this Agreement.


7.     NO OBLIGATIONS TO BORROWERS

7.1    The Borrowers join in this Agreement to acknowledge the arrangements
       made between the Banks and the Agent in this Agreement and to give the
       indemnities set out in Clauses 3.2 and 4.2 but shall have no rights
       under this Agreement.

7.2    Nothing in this Agreement shall as between the Borrowers on the one hand
       and the Banks on the other hand affect or prejudice any rights or
       remedies under the Security.


8.     REPLACEMENT

       This Agreement supersedes and replaces the Intercreditor Agreements
       dated  17th  March  1998 and 26th  February  1998  except  that the
       provisions of Clause 3 of the latter agreement remain in force.


9.     COUNTERPARTS

       This  Agreement may be executed in any number of  counterparts  and
       all  of  such  counterparts  taken  together  shall  be  deemed  to
       constitute one and the same instrument.


10.    LAW AND JURISDICTION

       This Agreement  shall be governed by, and construed in all respects
       in accordance with English law.


IN WITNESS  whereof the parties hereto causes this Agreement to be duly executed
on the date set out above.


<PAGE>


                                   SCHEDULE 1

                          Participation in Risk-Sharing




Bank       First Participation Percentage     Second Participation Percentage

NatWest           71.429%                               47.619%

FNBM              28.571%                               28.571%
  
Comerica          --                                    23.810%






<PAGE>
<TABLE>

                                   SCHEDULE 2

                                    Security
<CAPTION>


                                 Document                                    Executed by           Date
<S>                                                                            <C>                <C>

1.  Guarantee and Debenture in favour of the Agent as amended by a              Parent             1.11.95
    Supplemental Deed dated 20th January 1998 and a Supplemental Deed
    dated 26th February 1998

2.  Guarantee  and  Debenture  in favour of the  Agent as  amended  by a        HLSL
    21.11.95  Supplemental  Deed dated 20th January  1998 and a  Supplemental
    Deed dated 26th February 1998

3.  Guarantee in favour of the Agent as amended by a Supplemental Deed          HLS                21.11.95
    dated 20th January 1998 and a Supplemental Deed dated 26th
    February 1998

4.  Security Agreement in favour of the Agent as amended by a                   HLS                21.11.95
    Supplemental Deed dated 20th January 1998 and a Supplemental Deed
    dated 26th February 1998

5.  Mortgage  in favour  of the Agent  over the New  Jersey  Property  as       HLS
    16.01.98 amended by a Supplemental Deed dated 26th February 1998

6.  Equipment Mortgage in favour of the Agent                                   HLSL               20.04.98

7.  Security Agreement incorporating an Equipment Mortgage and a                HLS                30.04.98
    Charge over an Operating Account in favour of the Agent

</TABLE>


<PAGE>



SIGNED by                                             )  S J HAMILTON
S J HAMILTON                                          )
for and on behalf of NATIONAL WESTMINSTER BANK Plc    )
(as Agent)                                            )





SIGNED by                                             )  S J HAMILTON
S J HAMILTON                                          )
for and on behalf of NATIONAL WESTMINSTER BANK Plc    )
(as a Bank)                                           )





SIGNED by                                             )  RONALD LAPOINTE
RONALD LAPOINTE                                       )
for and on behalf of THE FIRST NATIONAL BANK OF       )
MARYLAND (as a Bank)                                  )





SIGNED by                                             )  HENRY HADJAS
HENRY HADJAS                                          )
for and on behalf of COMERICA BANK (as a Bank)        )
                                                      )





SIGNED by                                             )  CHRISTOPHER CLIFFE
CHRISTOPHER CLIFFE                                    )
for and on behalf of HUNTINGDON LIFE SCIENCES GROUP   )
plc                                                   )





SIGNED by                                             )  CHRISTOPHER CLIFFE
CHRISTOPHER CLIFFE                                    )
for and on behalf of HUNTINGDON LIFE SCIENCES         )
LIMITED                                               )





SIGNED by                                             )  CHRISTOPHER CLIFFE
CHRISTOPHER CLIFFE                                    )
for and on behalf of HUNTINGDON LIFE SCIENCES, INC.   )
                                                      )