Holding(s) in Company

Cookson Group PLC
20 December 2005

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1) Name of company

COOKSON GROUP PLC

2) Name of shareholder having a major interest

BRITEL FUND TRUSTEES LIMITED

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

BRITEL FUND NOMINEES LTD (335,093 SHARES)

CHASE NOMINEES LTD (6,929,047 SHARES)

5) Number of shares/amount of stock acquired

N/A

6) Percentage of issued class

N/A

7) Number of shares/amount of stock disposed

NOT DISCLOSED

8) Percentage of issued class

NOT DISCLOSED

9) Class of security

ORDINARY SHARES OF 10 PENCE EACH

10) Date of transaction

19 DECEMBER 2005

11) Date company informed

20 DECEMBER 2005

12) Total holding following this notification

7,264,140 SHARES

13) Total percentage holding of issued class following this notification

3.82%

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: 20 DECEMBER 2005


                      This information is provided by RNS
            The company news service from the London Stock Exchange