PRESS RELEASE                           LIFE SCIENCES RESEARCH, INC.
                                        (Other OTC: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 7, 2006


                      LSR ANNOUNCES SECOND QUARTER RESULTS

         Highlights:

o    Revenues of $47.9 million. Net Income of $1.1 million, or $0.08 per share.

o    Net new orders of $50.8 million.

o    $46.2 million Convertible Capital Bond fully repaid on April 6, 2006.

o    $10 million Promissory Note repaid to Company on June 30, 2006. Elimination
     of FIN46R consolidation accounting effective that date.

East Millstone, New Jersey, August 7, 2006 - Life Sciences Research, Inc. (Other
OTC:  LSRI)  announced  today that  revenues for the quarter ended June 30, 2006
were $47.9  million,  6.5% above the  revenues  for the same period in the prior
year of $44.9 million. Excluding the effect of exchange rate movements, revenues
increased  7.7%.  Operating  income for the quarter ended June 30, 2006 was $4.8
million, or 10.1% of revenues,  compared with $5.4 million, or 12.0% of revenues
for the same period in the prior year.  The Company  reported net income  before
the cumulative  effect of the  accounting  change for the quarter ended June 30,
2006 of $1.1 million, compared with $1.7 million loss for the quarter ended June
30,  2005.  Net income  per common  share  before the  cumulative  effect of the
accounting  change for the quarter  ended June 30, 2006 was $0.09  compared with
$0.13 loss in the  quarter  ended June 30,  2005.  Net income per fully  diluted
share before the cumulative  effect of the  accounting  change was $0.08 for the
current quarter compared to $0.11 loss in the prior year.



Concurrently with the repayment of the $10 million promissory note that was owed
to the Company by Alconbury Estates from the Sale and Leaseback transaction that
was announced in June 2005,  FIN46R  consolidation  accounting  ceased effective
June 30, 2006.  As a result,  the Company  recognized a charge in the period for
the cumulative  effect of the accounting  change of $20.7 million,  of which the
largest  charge is associated  with the non-cash  write-down of the Company's UK
facilities.

The net income before the  cumulative  effect of the  accounting  change for the
three months ended June 30, 2006 included  Other  Expenses of $2.2 million which
comprised  $3.3  million from a non-cash  foreign  exchange  remeasurement  gain
pertaining to the Convertible Capital Bonds and New Financing  denominated in US
dollars and other exchange gains of $0.3 million,  offset by finance arrangement
fees of $1.4  million  primarily  reflecting  fees of Alconbury  Estates,  LSR's
landlord,  which were consolidated  under FIN46. In the same period in the prior
year, Other Expenses of $2.7 million were comprised of finance  arrangement fees
of  $0.3  million,   and  $2.4  million  from  the  non-cash   foreign  exchange
remeasurement loss pertaining to the Convertible Capital Bonds.  Excluding these
non cash items and related tax effect,  net income before the cumulative  effect
of the accounting change for the current quarter was $1.1 million,  or $0.07 per
fully diluted share,  compared to $3.1 million, or $0.22 per fully diluted share
in the prior year.

Earnings  before  Interest,  Taxes,  Depreciation  and  Amortization  and  Other
Income/(Expense)  ("EBITDA") was $7.5 million for the second quarter of 2006, or
15.6% of revenues,  compared  with $7.9 million,  or 17.5% of revenues,  for the
same period in the prior year.

Net days sales  outstanding at June 30, 2006 were 12 (13 at June 30, 2005 and 16
at December 31, 2005).  Capital  expenditure  totaled $2.3 million in the second
quarter of 2006, compared to $3.7 million in the second quarter of 2005.

Cash on hand at June 30, 2006 was $42.8  million  compared with $15.4 million at
December 31, 2005.  Long-term  debt was $100.0 million at June 30, 2006 compared
with $30.4  million at December  31, 2005.  These  increases in both the cash on
hand and the long-term debt were due to the $70 million New Financing Loan which
generated net proceeds of approximately $64 million,  of which $46.2 million was
used to redeem  the  outstanding  principal  amount of the  Convertible  Capital
Bonds. The Company included in its reported  long-term debt the $22.8 million of
finance lease debt due to the deconsolidation of Alconbury.

Revenues for the six months ended June 30, 2006 of $90.3 million were 2.3% above
revenues for the same period in the prior year of $88.2  million.  Excluding the
effect of exchange rate movements,  the increase was 6.0%.  Operating Income for
the six  months  ended  June 30,  2006 was $8.9  million,  or 9.8% of  revenues,
compared  with $10.6  million,  or 12.0% of revenues  for the same period in the
prior year. The Company reported net income before the cumulative  effect of the
accounting  change  for the six  months  ended  June 30,  2006 of $1.6  million,
compared with $0.9 million for the same period in the prior year. Net income per
fully diluted share before the cumulative  effect of the  accounting  change for
the six months  ended June 30, 2006 was $0.11  compared  with $0.06 for the same
period in the prior year.



The net income before the cumulative  effect of the accounting change in the six
months ended June 30, 2006 included Other Income of $1.3 million which comprised
$3.7 million from the non-cash foreign exchange remeasurement gain pertaining to
the  Convertible  Capital Bonds and New Financing  denominated in US dollars and
other exchange gains of $0.2 million, offset by finance arrangement fees of $2.6
million primarily reflecting gains of Alconbury Estates,  LSR's landlord,  which
were  consolidated  under  FIN46.  In the same period in the prior  year,  Other
Expenses of $3.4 million  were  comprised  of finance  arrangement  fees of $0.3
million  and $3.1  million of a non-cash  foreign  exchange  remeasurement  loss
pertaining to the Convertible Capital Bonds.  Excluding these non cash items and
related tax effect,  net income before the  cumulative  effect of the accounting
change for the six  months  ended  June 30 2006 was $2.3  million,  or $0.16 per
fully diluted share,  compared to $6.2 million, or $0.43 per fully diluted share
in the prior year.

Earnings  before  Interest,  Taxes,  Depreciation  and  Amortization  and  Other
Income/(Expense)  ("EBITDA") was $14.0 million for the six months ended June 30,
2006, or 15.5% of revenues,  compared with $15.4 million,  or 17.5% of revenues,
for the same period in the prior year.

Capital  expenditure  totaled  $4.0  million  in the first  six  months of 2006,
compared to $6.9 million in the first six months of 2005.

Net new business  signings totaled $50.8 million for the second quarter of 2006.
This  represented an increase of 10% from the second quarter orders in 2005. Net
new  business  signings  for the six  months  ended  June 30,  2006 were  $107.4
million,  an increase of 14% on the six months ended June 30, 2005.  At June 30,
2006 backlog (booked on work) amounted to approximately $144 million.

Brian Cass, LSR's President and Managing  Director added, "We are delighted with
the strong order levels we have  experienced this year. We are now seeing an 18%
growth over last year on this  measure on a constant  currency  basis.  This has
been driven by increases in the  pharmaceutical  business  which year on year is
now up 27% at  constant  currency.  Particularly  pleasing  within  this was the
support  from the top global  pharmaceutical  companies.  These order levels are
beginning  to flow  through  into  increased  revenues  as we saw this  quarter.
Despite an  unusually  high  expense  profile  this  quarter we did show  margin
improvement from the first quarter and expect to maintain this going forward."

LSR will hold an investor  conference  call to discuss the quarter's  results on
Monday  morning,  August  7, 2006 at 9:30 a.m.  Eastern  Time.  That call can be
listened to by dialing (312) 470-0031 pass code 25264.  We suggest  calling five
minutes prior to the scheduled call.


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 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 the Company's SEC filings, including its Form 10-K for the fiscal
year ended December 31, 2005, as filed with the US Securities and Exchange
Commission.

                              - tables to follow -



                  Life Sciences Research Inc. and Subsidiaries
                   Condensed Consolidated Statements of Income

                                    Unaudited


                                                         Three months ended               Six months ended
                                                              June 30                         June 30

(Dollars in thousands, except per share data)               2006            2005           2006            2005
                                                                                               
Revenues                                                 $47,851         $44,941        $90,306         $88,235
Cost of sales                                           (35,125)        (32,459)       (66,883)        (63,541)
                                                    -------------    ------------    -----------     -----------
Gross profit                                              12,726          12,482         23,423          24,694
Selling, general and administrative expenses             (7,881)         (7,074)       (14,552)        (14,086)
                                                    -------------    ------------    -----------     -----------
Operating income                                           4,845           5,408          8,871          10,608
Interest income                                              273              22            531              45
Interest expense                                         (3,932)         (1,934)        (6,895)         (3,717)
Other income/(expense)                                     2,234         (2,703)          1,263         (3,435)
                                                    -------------    ------------    -----------     -----------
Income before income taxes                                 3,420             793          3,770           3,501
Income tax expense                                       (2,283)         (2,455)        (2,163)         (2,639)
                                                    -------------    ------------    -----------     -----------
Income/(loss) before cumulative effect of
accounting change                                         $1,137        $(1,662)         $1,607            $862
Cumulative effect of accounting change (net of
income tax benefit of $22,218)                          (20,656)               -       (20,656)               -
                                                    -------------    ------------    -----------     -----------
Net (loss)/income                                      $(19,519)        $(1,662)      $(19,049)            $862
                                                    -------------    ------------    -----------     -----------

Basic (loss)/income per share
Income/(loss) before cumulative effect of
accounting change                                          $0.09         $(0.13)          $0.13           $0.07
Cumulative effect of accounting change                    (1.63)               -         (1.64)               -
                                                    -------------    ------------    -----------     -----------
Basic (loss)/income per share                            $(1.54)         $(0.13)        $(1.51)           $0.07
                                                    -------------    ------------    -----------     -----------
Diluted (loss)/income per share:
Income/(loss) before cumulative effect of
accounting change                                          $0.08         $(0.11)          $0.11           $0.06
Cumulative effect of accounting change                   $(1.42)               -        $(1.42)               -
                                                    -------------    ------------    -----------     -----------
Diluted (loss)/income per share                          $(1.34)         $(0.11)        $(1.31)           $0.06
                                                    -------------    ------------    -----------     -----------

Weighted average number of common stock
- - Basic     (000's)                                       12,653          12,521         12,606          12,487
- - Diluted  (000's)                                        14,533          14,543         14,500          14,504







                  Life Sciences Research Inc. and Subsidiaries
                           Consolidated Balance Sheets



(Dollars in thousands, except per share data)                            June 30,           December 31,
                                                                             2006                   2005
ASSETS                                                                  Unaudited                Audited
                                                                                          
Current assets:
Cash and cash equivalents                                                 $42,830                $15,420
Accounts receivable, net of allowance of $728 and $618 in
    2006 and 2005 respectively                                             28,345                 26,810
Unbilled receivables                                                       14,257                 11,981
Inventories                                                                 1,970                  1,992
Prepaid expenses and other current assets                                   9,429                  7,062
                                                                  ----------------       ----------------
Total current assets                                                       96,831                 63,265

Property and equipment, net                                                56,785                105,605
Goodwill                                                                    1,422                  1,195
Other assets                                                                9,383                    901
Unamortized capital bonds issue costs                                           -                     70
Deferred income taxes                                                      34,364                 13,333
                                                                  ----------------       ----------------
Total assets                                                             $198,785               $184,369
                                                                  ----------------       ----------------

LIABILITIES AND STOCKHOLDERS' EQUITY/(DEFICIT)
Current liabilities:
Accounts payable                                                          $14,865                $15,742
Accrued payroll and other benefits                                          3,711                  3,655
Accrued expenses and other liabilities                                     14,140                 15,862
Pension liabilities                                                         4,994                  4,635
Short-term debt                                                               680                 46,946
Fees invoiced in advance                                                   35,941                 32,920
                                                                  ----------------       ----------------
Total current liabilities                                                  74,331                119,760

Long-term debt                                                            100,005                 30,430
Pension liabilities, less short-term portion                               52,514                 48,747
                                                                  ----------------       ----------------
Total liabilities                                                        $226,850               $198,937
                                                                  ----------------       ----------------

Commitments and contingencies
Stockholders' equity/(deficit)
Preferred Stock, $0.01 par value.  Authorized 5,000,000
Issued and outstanding: None                                                    -                      -
Non-Voting Common Stock, $0.01 par value.  Authorized 5,000,000
Issued and outstanding: None                                                    -                      -
Voting Common Stock, $0.01 par value.  Authorized 50,000,000
Issued and outstanding at June 30, 2006: 12,668,820 (December
31, 2005: 12,553,251)                                                         127                    126
Paid in capital                                                            81,284                 75,848
Less: Promissory notes for the issuance of common stock                      (73)                  (205)
Accumulated other comprehensive loss                                     (49,406)               (49,389)
Accumulated deficit                                                      (59,997)               (40,948)
                                                                  ----------------       ----------------
Total stockholders' equity /(deficit)                                    (28,065)               (14,568)
                                                                  ----------------       ----------------
Total liabilities and stockholders' equity /(deficit)                    $198,785               $184,369
                                                                  ----------------       ----------------