Costain Group Regulatory News (COST)

Costain Group PLC("the Company")

Long Term Incentive Plan - Blocklisting Application

The following correction announcement replaces RNS: 4915M (released 7 May) in its entirety.

Application has been made to the Official List of the UK Listing Authority and to the London Stock Exchange for the admission of 689,042 ordinary shares of 50p each in the Company (the 'Shares') by way of a block listing, subject to future issues of shares relating to options that were granted under the Company's Long Term Incentive Plan in May 2012.

The Shares will be issued fully paid and will, upon issue, rank parri passu in all respects with the Company's existing issued shares. Admission, subject to allotment, is expected to occur on 11 May 2015.

Enquiries:

Costain Group PLC Tel: 01628 842444Tracey Wood

Company Secretary