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


August 8, 2003


                      LSR ANNOUNCES SECOND QUARTER RESULTS

East  Millstone,  New  Jersey,  August 8, 2003 - Life  Sciences  Research,  Inc.
(OTCBB:LSRI)  announced  today that revenues for the quarter ended June 30, 2003
were $32.7 million,  14% above the revenues for same period in the prior year of
$28.6 million. Excluding the effects of exchange rate movements the increase was
7%. The Company  reported net income for the quarter ended June 30, 2003 of $1.9
million, compared with net income of $2.9 million for the quarter ended June 30,
2002.  Net  income  per  share for the  quarter  ended  June 30,  2003 was $0.16
compared  with a net income of $0.24 in the  quarter  ended June 30,  2002.  Net
income  included  non-cash  exchange  gains on the  conversion  of the Company's
dollar denominated  liabilities including bonds into UK sterling of $2.0 million
compared to exchange  gains in the same  period  last year of $3.2  million.  In
addition,  Convertible  Capital  Bonds  of $450  thousand  were  repurchased  or
cancelled in the quarter producing a net income of $0.2 million.  Excluding that
non-cash  currency gain,  and the gain on the repurchase of the Bonds,  Earnings
before  Interest,  Taxes,  Depreciation  and  Amortization  ("EBITDA")  was $3.8
million  for the  second  quarter,  or 11.7% of  revenues,  compared  with  $3.0
million, or 10.6% of revenues, for the same period in the prior year.

Revenues for the six months ended June 30, 2003 at $64.6  million were 18% above
the revenues for the same period in the prior year of $54.7  million.  Excluding
the effect of exchange rate movements, the increase was 9%. The Company reported
net income for the six months ended June 30, 2003 of $1.5 million  compared with
a net loss of $0.4 million in the six months ended June 30, 2002. The income per
share for the six months ended June 30, 2003 was $0.13  compared  with a loss of
$0.04 in the six  months  ended June 30,  2002.  Net  income  included  non-cash
exchange gains on the conversion of the Company's dollar denominated liabilities
including  bonds into UK sterling of $1.1 million  compared to exchange gains in
the same period last year of $2.1 million.  In addition,  there was Other income
in 2003 of $0.6  associated  with the repurchase of  Convertible  Capital Bonds.
Other income in the prior year was offset by merger/offer costs of $1.5 million.
Excluding  these Other income items,  EBITDA was $7.6 million for the first half
of the  year,  or 11.7% of  revenues,  compared  with $5.1  million,  or 9.3% of
revenues, for the same period in the prior year.




Brian Cass,  LSR's  President and Managing  Director said "We're proud to report
another quarter of steadily  improving results.  Revenue,  operating profit, and
net income from  operations  are all ahead  sequentially  and  compared to prior
year.  First half  revenue,  adjusted for exchange rate  movements,  is 9% above
prior year,  despite  some study  cancellations  and delays.  Operating  profits
during that same period more than doubled,  benefiting  from  economies of scale
and attention to expenses."

Andrew Baker, LSR's Chairman and CEO, said "This quarter marks another financial
milestone for LSR,  getting down to a 4.8 multiple of trailing  annual EBITDA to
total debt minus  cash.  With our  growing  margins,  solid cash  position,  and
reduced debt levels over the last few  quarters,  we're  pleased to be moving in
the  right  direction.   We're  committed  to  remaining  focused  on  continued
improvement in this important metric in the coming one to two years."

Life Sciences  Research,  Inc. is one of the world's leading  Contract  Research
Organizations  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 12, 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
                  (amounts in thousands, except per share data)



                                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

                                                        Three months ended                 Six months ended
                                                              June 30                          June 30
                                                             Unaudited                        Unaudited
(Dollars in thousands, except per share data)              2003             2002            2003             2002

                                                                                             
Net revenues                                            $32,663          $28,590         $64,564          $54,725
Cost of revenue                                        (25,442)         (23,069)        (50,815)         (44,665)
                                                   ------------    ------------      -------------   -------------
Gross profit                                              7,221            5,521          13,749           10,060
Selling , general and administrative expenses           (5,527)          (4,375)        (10,448)          (8,727)
                                                   -------------     ------------    ------------    -------------
Operating income                                          1,694            1,146           3,301            1,333
Interest income                                              23               27              39               33
Interest expense                                        (1,444)          (1,524)         (3,152)          (3,151)
Other income                                              2,179            3,241           1,729              618
                                                   ------------    ------------      -------------   -------------
Income/(loss) before income taxes                         2,452            2,890           1,917          (1,167)
Income tax (expense)/benefit                              (592)               26           (415)              768
                                                   ------------    ------------      -------------   -------------
Net income/(loss)                                        $1,860           $2,916          $1,502           $(399)
                                                   -------------     ------------    ------------    -------------
                                                   -------------     ------------    ------------    -------------
Net income/(loss) per common share
- - Basic                                                   $0.16            $0.24           $0.13          $(0.04)
- - Diluted                                                 $0.15            $0.24           $0.12          $(0.04)

Weighted average common shares outstanding
- - Basic     (000's)                                      11,932           11,932          11,932            9,428
- - Diluted  (000's)                                       12,244           12,053          12,754            9,428







                           Life Sciences Research Inc.
                             Statement of Operations
                  (amounts in thousands, except per share data)



(Dollars in thousands)                                                   June 30,           December 31,
                                                                           2003                  2002
                                                                         Unaudited             Audited

                                                                                        
ASSETS
Current assets:
Cash and cash equivalents                                                 $10,645                $14,644
Accounts receivable, net of allowance of $415 and $287 in
    2003 and 2002 respectively                                             20,349                 20,176
Unbilled receivables                                                       10,873                  9,108
Inventories                                                                 1,619                  1,556
Prepaid expenses and other current assets                                   2,897                  3,075
                                                                  ----------------       ----------------
Total current assets                                                      $46,383                $48,559
                                                                  ----------------       ----------------

Property and equipment, net                                                96,358                 94,574
Investments                                                                   245                    248
Unamortized capital bonds issue costs                                         479                    563
Deferred income taxes                                                       4,668                  4,466
                                                                  ----------------       ----------------
Total assets                                                             $148,133               $148,410
                                                                  ----------------       ----------------
                                                                  ----------------       ----------------
LIABILITIES AND SHAREHOLDERS' EQUITY/(DEFICIT)
Current liabilities:
Accounts payable                                                           $9,669                 $8,574
Accrued payroll and other benefits                                          1,867                  1,773
Accrued expenses and other liabilities                                     12,952                 12,990
Fees invoiced in advance                                                   24,202                 26,066
                                                                   ---------------       ----------------
Total current liabilities                                                 $48,690                $49,403
                                                                   ---------------       ----------------
Long-term debt                                                             83,192                 83,717
Related party loans                                                             -                    358
Pension liabilities                                                        17,492                 17,712
Deferred income taxes                                                       5,648                  5,024
                                                                   ---------------       ----------------
Total liabilities                                                        $155,022               $156,214
                                                                   ---------------       ----------------
Commitments and contingencies
Shareholders' equity/(deficit)
Voting Common Stock, $0.01 par value.  Authorized 50,000,000
Issued and outstanding at June 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 oustanding: 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                      (636)                  (684)
Accumulated comprehensive loss                                           (19,211)               (18,576)
Accumulated deficit                                                      (62,259)               (63,761)
                                                                   ---------------       ----------------
Total shareholders' equity /(deficit)                                    $(6,889)               $(7,804)
                                                                   ---------------       ----------------
Total liabilities and shareholders' equity /(deficit)                    $148,133               $148,410
                                                                   ---------------       ----------------