Total Voting Rights

Costain Group PLC
31 October 2007




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 625,154,761 with each share carrying the right to one vote. The
Company does not hold any ordinary shares in treasury.

The above figure (625,154,761) 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.




Enquiries:

Costain Group PLC               Tel: [phone]
Clive L Franks





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