Holding(s) in Company

Cookson Group PLC
12 August 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 (40,363,404 SHARES)

SCHRODER NOMINEES LIMITED (47,333,953 SHARES)

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

BANQUE NATIONALE DE PARIS (190,100 SHARES)

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

BNY(OSC)NOMINEES LIMITED A/C: 219021 (1,412,400 SHARES)

CHASE NOMINEES LIMITED (25,653,957 SHARES)

HSBC GLOBAL CUSTODY NOMINEE (UK) LTD (5,151,324 SHARES)

HSBC GLOBAL CUSTODY NOMINEE (UK) LTD A/C: 771401 (647,889 SHARES)

MSS NOMINEES LIMITED A/C: 813812 (2,037,138 SHARES)

MSS NOMINEES LIMITED A/C: 823654 (8,986,237 SHARES)

MSS NOMINEES LIMITED A/C: 823666 (5,692,254 SHARES)

NORTRUST NOMINEES LIMITED (26,002,181 SHARES)

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

NORTRUST NOMINEES LIMITED (4,299,300 SHARES)

PICTET & CIE (1,876,000 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

10 AUGUST 2004


11) Date company informed

10 AUGUST 2004


12) Total holding following this notification

189,574,165 SHARES


13) Total percentage holding of issued class following this notification

10.002%


14) Any additional information



15) Name of contact and telephone number for queries

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC - 020 7061 6562


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

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC


Date of notification: 12 AUGUST 2004


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