Holding(s) in Company

Cookson Group PLC
02 August 2006

                                  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

AS IN 2 ABOVE

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
HSDL NOMINEES LTD                      N/A                                     4
NORTRUST NOMINEES a/c ARW49            SLBA                              143,573
NORTRUST NOMINEES a/c ARW51            SLFO                              142,105
NORTRUST NOMINEES a/c ARW56            SXLFE                             157,511
NORTRUST NOMINEES a/c CMI06            WP                              3,521,941
NORTRUST NOMINEES a/c CMI10            1105                              376,453
NORTRUST NOMINEES a/c CMM13            2314                            2,324,758
NORTRUST NOMINEES a/c HLI24            HPBA                               16,780
NORTRUST NOMINEES a/c HLI26            HPFO                               15,110
NORTRUST NOMINEES a/c HLI27            HXPEN                              18,731

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

NOT DISCLOSED

11) Date company informed

2 AUGUST 2006

12) Total holding following this notification

6,716,966 SHARES

13) Total percentage holding of issued class following this notification

3.485%

14) Any additional information

15) Name of contact and telephone number for queries

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC - TEL: [phone]

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

RACHEL FELL, DEPUTY SECRETARY, COOKSON GROUP PLC



Date of notification: 2 AUGUST 2006


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