Holding(s) in Company

Cookson Group PLC
04 October 2004

                                  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

CHASE NOMINEES LIMITED (42,271,972 SHARES)

SCHRODER NOMINEES LIMITED (55,132,219 SHARES)

BANK OF NEW YORK (4,299,300 SHARES)

BANQUE INTERNATIONALE A LUXEMBOURG (2,063,400 SHARES)

BANQUE NATIONALE DE PARIS (239,216 SHARES)

BNY(OSC)NOMINEES LIMITED A/C: 218842 (4,125,665 SHARES)

BERMUDA TRUST (DUBLIN) LTD (1,412,400 SHARES)

CHASE NOMINEES LIMITED (27,927,637 SHARES)

HSBC GLOBAL CUSTODY NOMINEE (UK) LTD (5,405,427 SHARES)

HSBC GLOBAL CUSTODY NOMINEE (UK) LTD A/C: 771401 (767,856 SHARES)

MELLON NOMINEES (UK) LTD (1,200,000 SHARES)

MSS NOMINEES LIMITED A/C: 813812 (2,061,449 SHARES)

MSS NOMINEES LIMITED A/C: 823654 (9,244,974 SHARES)

MSS NOMINEES LIMITED A/C: 823666 (6,734,078 SHARES)

NORTRUST NOMINEES LIMITED (31,886,481 SHARES)

NORTRUST NOMINEES LIMITED A/C: BOCPF (2,981,873 SHARES)

PICTET & CIE (2,403,995 SHARES)

STATE STREET NOMINEES LIMITED (10,757,090 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 1 PENCE EACH

10) Date of transaction

1 OCTOBER 2004

11) Date company informed

4 OCTOBER 2004

12) Total holding following this notification

210,915,032 SHARES

13) Total percentage holding of issued class following this notification

11.128%

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: 4 OCTOBER 2004


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