Change in shareholding

Costain Group PLC
13 July 2005



Costain Group PLC

(the 'Company' or 'Costain')


Costain announces that it has been notified on 12 July 2005 that Artemis UK
Growth Fund has increased its shareholding in the Company to 13,538,274 ordinary
shares equivalent to 3.83% of the issued share capital. The date on which the
transaction was effected is not known. Costain has also been notified on 13 July
2005 that UBS AG, acting through its business group and legal entities has
increased the number of ordinary shares it holds in the Company to 10,936,952
ordinary shares equivalent to 3.10% of the issued share capital of the Company.
The date on which the transaction was effected is not know.






                                                                    13 July 2005


Enquiries:

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






                      This information is provided by RNS
            The company news service from the London Stock Exchange