Sale of Shares

Costain Group PLC
02 May 2003



                                COSTAIN GROUP PLC

                                 Sale of Shares


Costain Group PLC (the 'Company') announces that it has been notified on 2 May
2003 that one of its major shareholders, Raymond International WLL ('Raymond
International'), had sold 500,000 Ordinary Shares in the Company on 28 April
2003.


Following this notification Raymond International's holding in the Company is
37,743,750 ordinary shares, representing 10.93% of the Company's issued share
capital.


2 May 2003



ENQUIRIES:

Costain Group PLC                          Tel. [phone]
Clive L Franks, Company Secretary          Email: [e-mail]



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