PRESS RELEASE                            LIFE SCIENCES RESEARCH, INC.
                                         (OTCBB: LSRI)
                                         PO Box 2360
                                         Mettlers Road
                                         East Millstone, NJ 08875-2360

                                         For Further Information:
                                         Richard Michaelson
                                         Phone:   US: (732) 649-9961
                                         e-mail: LifeSciencesResearch@LSRinc.net


November 3, 2003

                       LSR ANNOUNCES THIRD QUARTER RESULTS

East  Millstone,  New Jersey,  November 3, 2003 - Life Sciences  Research,  Inc.
(OTCBB:LSRI)  announced  today that revenues for the quarter ended September 30,
2003 were $32.7  million,  9.3% above the  revenues  for the same  period in the
prior year of $30.0  million.  The Company  reported  net income for the quarter
ended  September  30, 2003 of $0.4  million,  compared with $1.5 million for the
quarter ended  September  30, 2002.  Net income per common share for the quarter
ended  September  30, 2003 was $0.03  compared  with $0.13 in the quarter  ended
September 30, 2002. Net income included  non-cash foreign  exchange  transaction
gains on the conversion of the Company's dollar  denominated bonds into UK pound
sterling of $0.3 million  compared to $1.6 million in the same period last year.
Excluding the non-cash  foreign  exchange  transaction  gains,  Earnings  before
Interest,  Taxes,  Depreciation and Amortization ("EBITDA") was $3.9 million for
the third quarter, or 11.9% of revenues, compared with $3.7 million, or 12.3% of
revenues, for the same period in the prior year.

Revenues for the nine months ended September 30, 2003 were $97.3 million,  which
were 14.9%  above the  revenues  for the same  period in the prior year of $84.7
million. The Company reported net income for the nine months ended September 30,
2003 of $1.9 million compared with net income of $1.1 million in the nine months
ended  September 30, 2002. Net income per common share for the nine months ended
September  30,  2003 was $0.16  compared  with  $0.11 in the nine  months  ended
September 30, 2002. Net income included  non-cash foreign exchange  transactions
gains on the conversion of the Company's dollar  denominated bonds into UK pound
sterling of $1.4 million compared to a $3.9 million foreign exchange transaction
gain in the same period  last year.  Excluding  the  non-cash  foreign  exchange
transaction gain/loss, EBITDA was $12.1 million for the first nine months of the
year, or 12.4% of revenues, compared with $7.3 million, or 8.6% of revenues, for
the same period in the prior year.

Brian Cass,  LSR's  President and Managing  Director  said "LSR again  delivered
consistent results in this quarter, representing the seventh consecutive quarter
of revenue growth.  Operating  profits were maintained and as we look forward we
shall  continue to focus on cost  management to push through more of the revenue
growth to the bottom line. Cash management is still a priority, but the progress
we have made has also  allowed us to invest  more in new capital  projects  this
year as we update our systems and  infrastructure,  reflecting our positive view
of the future."

Mr. Cass added "Order levels were softer this quarter but new business enquiries
were encouraging and we have been particularly  pleased with the strength of our
Japanese market."

Life  Sciences  Research,  Inc.  is  a  global  Contract  Research  Organization
providing product development  services to the pharmaceutical,  agrochemical and
biotechnology  industries.  LSR brings  leading  technology  and  capability  to
support its clients in  non-clinical  safety  testing of new  compounds in early
stage development and assessment.  The purpose of this work is to identify risks
to humans, animals or the environment resulting from the use or manufacture of a
wide  range of  chemicals  which  are  essential  components  of LSR's  clients'
products.   The  Company's   services  are  designed  to  meet  the   regulatory
requirements of governments  around the world. LSR operates research  facilities
in the United States (the Princeton  Research Center, New Jersey) and the United
Kingdom (Huntingdon and Eye, England).

This announcement  contains statements that may be forward-looking as defined by
the USA's Private Securities Litigation Reform Act of 1995. These statements are
based  largely on LSR's  expectations  and are  subject to a number of risks and
uncertainties,  certain  of  which  are  beyond  LSR's  control,  as more  fully
described in LSR's Registration  Statement on Form S-1, dated July 25, 2002, and
the  Company's  Form 10-K for the fiscal year ended  December 31, 2002,  each as
filed with the US Securities and Exchange Commission.


                              - tables to follow -






                           Life Sciences Research Inc.
                             Statement of Operations

                                    Unaudited


                                              Three months ended          Nine months ended
                                                 September 30               September 30
(Dollars in thousands,                           2003        2002         2003       2002
except per share data)
                                                                       
Net revenues ...............................   $ 32,723    $ 29,951    $ 97,287    $ 84,676
Cost of revenue ............................    (26,164)    (24,023)    (76,979)    (68,689)
                                                --------    --------    --------    --------
Gross profit ...............................      6,559       5,928      20,308      15,987
Selling, general and administrative expenses      5,189      (4,637)    (15,505)    (13,363)
Other operating income .....................        387        --           255        --
                                                --------    --------    --------    --------
Operating income ...........................      1,757       1,291       5,058       2,624
Interest income ............................         10          20          49          53
Interest expense ...........................     (1,464)     (1,522)     (4,616)     (4,672)
Other (expense)/income .....................        308       1,747       2,037       2,364
                                                --------    --------    --------    --------
Income before income taxes .................        611       1,536       2,528         369
Income tax (expense)/ benefit ..............       (215)        (34)       (630)        734
                                                --------    --------    --------    --------

Net income .................................   $    396    $  1,502    $  1,898    $  1,103
                                                --------    --------    --------    --------
                                                --------    --------    --------    --------
Income per common share
- - Basic ....................................      0.03        0.13        0.16        0.11
- - Diluted ..................................      0.03        0.12        0.15        0.10

Weighted average common shares outstanding
- - Basic  (000').............................     11,932      11,932      11,932      10,256
- - Diluted  (000's) .........................     12,271      12,224      12,920      10,642









                           Life Sciences Research Inc.
                                  Balance Sheet



(Dollars in thousands)                                         September 30,   December 31,
                                                                     2003         2002
                                                                  Unaudited     Unaudited
                                                                         
ASSETS
Current assets:
Cash and cash equivalents .....................................   $  10,549    $  14,644
Accounts receivable, net of allowance of $546 and $287 in
    2003 and 2002 respectively ................................      20,080       20,176
Unbilled receivables ..........................................      11,238        9,108
Inventories ...................................................       1,590        1,556
Prepaid expenses and other current assets .....................       3,801        3,075
                                                                  ---------    ---------
Total current assets ..........................................   $  47,258    $  48,559
                                                                  ---------    ---------

Property and equipment, net ...................................      96,948       94,574
Investments ...................................................        --            248
Goodwill ......................................................         693         --
Unamortized capital bonds issue costs .........................         440          563
Deferred income taxes .........................................       4,520        4,466
                                                                  ---------    ---------

Total assets ..................................................   $ 149,859    $ 148,410
                                                                  ---------    ---------
                                                                  ---------    ---------

LIABILITIES AND SHAREHOLDERS' EQUITY/(DEFICIT)
Current liabilities:
Accounts payable ..............................................   $  11,289    $   8,574
Accrued payroll and other benefits ............................       1,962        1,773
Accrued expenses and other liabilities ........................      11,389       12,990
Fees invoiced in advance ......................................      24,475       26,066
                                                                  ---------    ---------
Total current liabilities .....................................   $  49,115    $  49,403
                                                                  ---------    ---------
Long-term debt ................................................      84,347       83,717
Related party loans ...........................................        --            358
Pension liabilities ...........................................      17,291       17,712
Deferred income taxes .........................................       5,722        5,024
                                                                  ---------    ---------
Total liabilities .............................................   $ 156,475    $ 156,214
                                                                  ---------    ---------
Commitments and contingencies
Shareholders' equity/(deficit)
Voting Common Stock, $0.01 par value.  Authorized 50,000,000
Issued and outstanding at September 30, 2003: 11,932,338
(December 31, 2002: 11,932,338) ...............................         119          119
Non-Voting Common Stock, $0.01 par value.  Authorized 5,000,000        --           --
Issued and outstanding: None
Preferred Stock, $0.01 par value.  Authorized 5,000,000 .......        --           --
Issued and outstanding: None
Paid in capital ...............................................      75,098       75,098
Less Promissory notes for the issuance of common stock ........        (628)        (684)
Accumulated comprehensive loss ................................     (19,342)     (18,576)
Accumulated deficit ...........................................     (61,863)     (63,761)
                                                                  ---------    ---------
Total shareholders' equity /(deficit) .........................   $  (6,616)   $  (7,804)
                                                                  ---------    ---------
Total liabilities and shareholders' equity /(deficit) .........   $ 149,859    $ 148,410
                                                                  ---------    ---------