Submission of prospectus to NSM

THIS ANNOUNCEMENT AND THE INFORMATION HEREIN IS RESTRICTED AND IS NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, OUTSIDE OF THE UNITED KINGDOM, INCLUDING IN OR INTO AUSTRALIA, CANADA, JAPAN, SWITZERLAND, NEW ZEALAND, THE REPUBLIC OF SOUTH AFRICA OR THE UNITED STATES OR ANY OTHER JURISDICTION IN WHICH SUCH RELEASE, PUBLICATION OR DISTRIBUTION WOULD BE UNLAWFUL.

THIS ANNOUNCEMENT IS AN ADVERTISEMENT AND NOT A PROSPECTUS AND INVESTORS SHOULD NOT SUBSCRIBE FOR OR PURCHASE ANY SECURITIES REFERRED TO IN THIS ANNOUNCEMENT EXCEPT ON THE BASIS OF INFORMATION CONTAINED IN THE PROSPECTUS.

28 February 2014

COSTAIN GROUP PLC

SUBMISSION OF PROSPECTUS TO NATIONAL STORAGE MECHANISM

The combined circular and prospectus of Costain Group PLC (the 'Company') dated 27 February 2014 relating to the proposed firm placing and placing and open offer announced yesterday by the Company has been submitted to the National Storage Mechanism and is available for inspection at http://www.morningstar.co.uk/uk/NSM.

ENQUIRIES

Costain Group PLCTracey Wood (Company Secretary) +44 (0)1628 842 444

ENDS