Holding(s) in Company

Cookson Group PLC
17 March 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

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

BANQUE INTERNATIONALE A LUXEMBOURG (2,436,500 SHARES)

BANQUE NATIONALE DE PARIS (305,386 SHARES)

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

BNY (OSC) NOMINEES LIMITED A/C: 219021 (4,125,665 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)

ICCRI BANCA FEDERALE EUROPEA (5,331,000 SHARES)

MELLON NOMINEES (UK) LTD (1,470,700 SHARES)

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

MSS NOMINEES LIMITED A/C: 823654 (9,253,169 SHARES)

MSS NOMINEES LIMITED A/C: 823666 (7,178,912 SHARES)

NORTRUST NOMINEES LIMITED (32,658,752 SHARES)

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

PICTET & CIE (2,483,794 SHARES)

STATE STREET NOMINEES LIMITED (8,708,347 SHARES)

CHASE NOMINEES LIMITED (23,083,751 SHARES)

SCHRODER NOMINEES LIMITED (58,891,391 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 1 PENCE EACH

10) Date of transaction

16 MARCH 2005

11) Date company informed

16 MARCH 2005

12) Total holding following this notification

200,783,309 SHARES

13) Total percentage holding of issued class following this notification

10.590%

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: 17 MARCH 2005


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