AGM Results

Costain Group PLC
09 May 2008


Costain Group PLC
('Costain' or the 'Group')

AGM Results

At the Company's Annual General Meeting held yesterday, each of the resolutions
set out in the Notice of Meeting circulated to shareholders on 4 April 2008 was
passed on a show of hands.  The proxy figures for the resolutions were as
follows:

                     VOTES FOR    VOTES AGAINST   DISCRETIONARY VOTES  TOTAL VOTES CAST  VOTES WITHHELD*

Resolution 1          291,185,533          7,131             1,744,463       293,010,250           73,123

Resolution 2          291,195,475         12,538             1,740,199       293,010,250           62,038

Resolution 3a         290,952,140        112,847             1,806,257       293,010,250          139,006

Resolution 3b         290,920,476        143,191             1,803,507       293,010,250          143,076

Resolution 3c         290,944,544        104,370             1,809,042       293,010,250          152,295

Resolution 3d           Withdrawn      Withdrawn             Withdrawn         Withdrawn        Withdrawn

Resolution 4          287,234,120        424,152             1,738,375       293,010,250        3,613,603

Resolution 5          290,914,739         73,232             1,779,855       293,010,250          242,424

Resolution 6          284,548,585      6,433,144             1,838,593       293,010,250          189,928

Resolution 7          280,404,147        342,281             1,806,410       293,010,250       10,457,412

Resolution 8          280,374,690        341,501             1,824,165       293,010,250       10,469,894

Resolution 9          286,994,562        450,865             1,845,170       293,010,250        3,719,653

Resolution 10         280,105,294        594,499             1,765,460       293,010,250       10,544,997


*Note: A vote withheld is not a vote in law and is not counted in the
calculation of the proportion of votes 'for' and 'against' a resolution.

Copies of the resolutions dealing with special business at the Annual General
Meeting have been submitted to the UK Listing Authority and will shortly be
available for inspection at the UK Listing Authority's Document Viewing Facility
which is situated at the Financial Services Authority, 25 The North Colonnade,
Canary Wharf, London E14 5HS (telephone number 020 7676 1000) during normal
business hours on any weekday (public holidays excepted).


                                                                      9 May 2008

ENQUIRIES:

Costain Group PLC                                                                            Tel: [phone]
Andrew Wyllie, Chief Executive
Tony Bickerstaff, Finance Director
Graham Read, Public Relations

College Hill                                                                                 Tel: [phone]
Mark Garraway
Adam Aljewicz




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