Long-Term Incentive Plan

Costain Group PLC
10 October 2006


Costain Group PLC
('the Company')

Long-Term Incentive Plan

The Company announces details an Award in the form of an option with an exercise
price of £1 per exercise (whether on exercise of the entire Award or any part of
it) over 576,310 ordinary shares of 5p each made on 10 October 2006 under the
Costain Group PLC Long-Term Incentive Plan (LTIP) the award can only be
exercised on the achievement of specified performance conditions after the end
of the Company's Financial Year ending 31 December 2009. An Award was made to
the following Executive Director:


Name:                              Number of Shares subject to the Award

Mr A O Bickerstaff                 333,333


Other Awards were made on 10 October 2006 under the LTIP to employees who are
not Executive Directors of the Company.


Contingent Awards

Pursuant to the terms of Mr Bickerstaff's agreement the Company granted to Mr
Bickerstaff on 9 October 2006:



 a. a contingent Award of 120,000 ordinary shares of 5p each in the capital of
    the Company. The Award will vest dependant on the extent to which certain
    performance targets are satisfied for the Financial Year ending 31 December
    2007; and

 b. a contingent Award of 350,000 ordinary shares of 5p each in the capital of
    the Company. The Award will vest dependant on the extent to which certain
    performance targets are satisfied for the Financial Year ending 31 December
    2008.


                                                                 10 October 2006

Enquiries:


Costain Group PLC                                              Tel: [phone]
Clive L Franks, Company Secretary

College Hill                                                  Tel. [phone]
Mark Garraway
Matthew Gregorowski




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