Holding(s) in Company

Cookson Group PLC
20 November 2006

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1) Name of company

COOKSON GROUP PLC

2) Name of shareholder having a major interest

BARCLAYS 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

BARCLAYS GLOBAL INVESTORS CANADA LTD (13,952 SHARES)

GERRARD LTD (40,082 SHARES)

BARCLAYS GLOBAL INVESTORS JAPAN LTD (20,313 SHARES)

BARCLAYS GLOBAL INVESTORS LTD (1,916,605 SHARES)

BARCLAYS GLOBAL INVESTORS AUSTRALIA LTD (59,982 SHARES)

BARCLAYS GLOBAL INVESTORS, N.A. (1,942,216 SHARES)

BARCLAYS CAPITAL SECURITIES LTD (501,299 SHARES)

BARCLAYS GLOBAL INVESTORS JAPAN TRUST & BANKING (220,752 SHARES)

BARCLAYS LIFE ASSURANCE CO LTD (231,209 SHARES)

BARCLAYS GLOBAL FUND ADVISORS (770,079 SHARES)

BARCLAYS PRIVATE BANK LTD (19,070 SHARES)

5) Number of shares/amount of stock acquired

NOT DISCLOSED

6) Percentage of issued class

NOT DISCLOSED

7) Number of shares/amount of stock disposed

N/A

8) Percentage of issued class

N/A

9) Class of security

ORDINARY SHARES OF 10 PENCE EACH

10) Date of transaction

NOT DISCLOSED

11) Date company informed

17 NOVEMBER 2006

12) Total holding following this notification

5,795,458

13) Total percentage holding of issued class following this notification

3.00%

14) Any additional information


15) Name of contact and telephone number for queries

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC - 020 7822 0062

16) Name and signature of authorised company official responsible for
making this notification

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC

Date of notification: 20 NOVEMBER 2006


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