Total Voting Rights

Costain Group PLC
01 May 2008



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



Total Voting Rights and Capital

In conformity with the Financial Services Authority's Disclosure and
Transparency Rule 5.6.1(R) we would like to notify the market of the following:

The Company's total number of ordinary shares in issue at the date of this
notice is 631,080,187 with each share carrying the right to one vote.  The
Company does not hold any ordinary shares in treasury.

The above figure 631,080,187 may be used by shareholders as the denominator for
the calculations by which they will determine if they are required to notify
their interest in, or a change to their interest in, Costain under the FSA's
Disclosure and Transparency Rules.

                                                                      1 May 2008

Enquiries:

Costain Group PLC        Tel: [phone]
Clive L Franks

College Hill             Tel: [phone]
Mark Garraway
Adam Aljewicz






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