Holding(s) in Company

Cookson Group PLC
07 October 2005

                                  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 BANK TRUST COMPANY LTD (968 SHARES)

BARCLAYS GLOBAL INVESTORS CANADA LTD (8,878 SHARES)

GERRARD LTD (63,220 SHARES)

BARCLAYS GLOBAL INVESTORS JAPAN LTD (17,399 SHARES)

BARCLAYS GLOBAL INVESTORS LTD (2,357,514 SHARES)

BARCLAYS GLOBAL INVESTORS AUSTRALIA LTD (30,096 SHARES)

BARCLAYS GLOBAL INVESTORS, N.A. (1,424,278 SHARES)

BARCLAYS CAPITAL SECURITIES LTD (766,533 SHARES)

BARCLAYS GLOBAL INVESTORS JAPAN TRUST & BANKING (233,295 SHARES)

BARCLAYS LIFE ASSURANCE CO LTD (234,807 SHARES)

BARCLAYS GLOBAL FUND ADVISORS (702,562 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

5 OCTOBER 2005

11) Date company informed

7 OCTOBER 2005

12) Total holding following this notification

5,839,550 SHARES

13) Total percentage holding of issued class following this notification

3.08%

14) Any additional information


15) Name of contact and telephone number for queries

RACHEL BENJAMIN, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC - 020 7061
6565

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


RACHEL BENJAMIN, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC

Date of notification: 7 OCTOBER 2005


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