Holding(s) in Company

Cookson Group PLC
08 November 2005

                                  SCHEDULE 10

                   NOTIFICATION OF MAJOR INTERESTS IN SHARES

1)                Name of company

COOKSON GROUP PLC

2) Name of shareholder having a major interest

SCHRODER INVESTMENT MANAGEMENT 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

SCHRODER UNIT TRUSTS LIMITED (NUMBER OF SHARES HELD NO LONGER NOTIFIABLE)

SCHRODER INVESTMENT MANAGEMENT NORTH AMERICA LIMITED (NUMBER OF SHARES HELD NO
LONGER NOTIFIABLE)

SCHRODER INVESTMENT MANAGEMENT NORTH AMERICA INC (NUMBER OF SHARES HELD NO
LONGER NOTIFIABLE)

SCHRODERS PLC (NUMBER OF SHARES HELD NO LONGER NOTIFIABLE)


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

3 NOVEMBER 2005

11) Date company informed

7 NOVEMBER 2005

12) Total holding following this notification

NOT DISCLOSED

13) Total percentage holding of issued class following this notification

LESS THAN 10%

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: 8 NOVEMBER 2005





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