Directorate

COOKSON GROUP PLC 20 September 1999 Cookson Group plc, the international materials technology group, is pleased to announce that Richard Haythornthwaite, 42, will join the Board as a non-executive Director on 1 November 1999. Mr. Haythornthwaite is currently Group Chief Executive of Blue Circle Industries PLC ('Blue Circle'). He has been on the Board of Blue Circle since 1997, prior to which he was a director of Premier Oil plc. Mr. Haythornthwaite is also Chairman of the British American Arts Association. For further information, please contact: Sir Bryan Nicholson Stephen Howard Chairman Chief Executive Cookson Group plc Cookson Group plc London WC2N 6HJ London WC2N 6HJ Tel: 0207 766 4500 Tel: 0207 766 4500 Fax: 0207 747 6600 Fax: 0207 747 6600

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