Holding in Company

Cookson Group PLC 20 December 2001 SCHEDULE 10 NOTIFICATION OF MAJOR INTERESTS IN SHARES 1) Name of company COOKSON GROUP PLC 2) Name of shareholder having a major interest MORLEY FUND MANAGEMENT LIMITED (A subsidiary of CGNU PLC) AND CGNU PLC 3) Please state whether notification indicates that it is in respect of holding of the shareholder named in 2 above or in respect of a non-beneficial interest or in the case of an individual holder if it is a holding of that person's spouse or children under the age of 18 AS ABOVE 4) Name of the registered holder(s) and, if more than one holder, the number of shares held by each of them BNY NORWICH UNION NOMINEES LTD - 19,438,073 SHARES CHASE GA GROUP NOMINEES LTD - 25,049,323 SHARES CUIM NOMINEE LIMITED - 19,706,690 SHARES RBSTB NOMINEES LIMITED - 1,589,478 SHARES 5) Number of shares/amount of stock acquired 305,533 SHARES 6) Percentage of issued class 0.04% 7) Number of shares/amount of stock disposed N/A 8) Percentage of issued class N/A 9) Class of security ORDINARY SHARES OF 50 PENCE EACH 10) Date of transaction 17 DECEMBER 2001 11) Date company informed 19 DECEMBER 2001 12) Total holding following this notification 65,783,564 SHARES 13) Total percentage holding of issued class following this notification 9.04% 14) Any additional information 15) Name of contact and telephone number for queries RACHEL FELL, COMPANY SECRETARIAL EXECUTIVE, COOKSON GROUP PLC - TEL: 020 7766 4536 16) Name and signature of authorised company official responsible for making this notification RACHEL FELL, COMPANY SECRETARIAL EXECUTIVE, COOKSON GROUP PLC Date of notification: 20 DECEMBER 2001

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