Holding(s) in Company

Cookson Group PLC
14 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

HBOS PLC

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

NON-BENEFICIAL INTEREST

4) Name of the registered holder(s) and, if more than one holder, the
number of shares held by each of them

REGISTERED HOLDER                      FUND                                                    NUMBER OF SHARES
CHASE NOMINEES a/c CMIG                1105                                                        297,130
CHASE NOMINEES a/c CMIG                2304                                                        517,292
CHASE NOMINEES a/c CMIG                2314                                                       1,771,566
CHASE NOMINEES LTD                     WP                                                         2,907,305
HSDL NOMINEES LTD                      N/A                                                            26
NORTRUST NOMINEES LIMITED a/c HXCM     HPFO                                                         10,177
NORTRUST NOMINEES LIMITED a/c HXCM     HLFO                                                        125,484
NORTRUST NOMINEES LTD                  HXPEN                                                        11,175
NORTRUST NOMINEES LTD                  HPBA                                                         11,451
NORTRUST NOMINEES LTD                  HLBA                                                        127,525
NORTRUST NOMINEES LTD                  HXLFE                                                       136,030
STATE STREET NOMINEES LIMITED a/c 2GDM 2GDM                                                        717,891
STATE STREET NOMINEES LIMITED a/c 2GDN 2GDN                                                        925,316
STATE STREET NOMINEES LIMITED a/c 2GFE 2GFE                                                        206,144

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 10 PENCE EACH

10) Date of transaction

NOT DISCLOSED

11) Date company informed

14 NOVEMBER 2005

12) Total holding following this notification

7,764,512 SHARES

13) Total percentage holding of issued class following this notification

4.09%

14) Any additional information

15) Name of contact and telephone number for queries

RACHEL BENJAMIN, COMPANY SECRETARIAL ASSISTANT, COOKSON GROUP PLC - TEL: 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: 14 NOVEMBER 2005


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