Blocklisting Interim Review

Cookson Group PLC
03 July 2006

                        BLOCK LISTING SIX MONTHLY RETURN


Date: 3 July 2006

Name of applicant:                                         Cookson Group plc

Name of scheme:                                            Cookson Group US Stock Purchase Plan

Period of return:                           From:          01/01/2006             To:        30/06/2006

Balance under scheme from previous return:                 448,379 Ordinary 10p Shares

The amount by which the block scheme has been increased,   -
if the scheme has been increased since the date of the
last return:

Number of securities issued/allotted under scheme during   263,331
period:

Balance under scheme not yet issued/allotted at end of     185,048 Ordinary 10p Shares
period

Number and class of securities originally listed and the   2,500,000 Ordinary 1p Shares (January 2004)
date of admission
                                                           2,500,000 Ordinary 1p Shares (January 2005)

                                                           448,379 Ordinary 10p Shares (May 2005)
Total number of securities in issue at the end of the      192,715,468 Ordinary 10p Shares
period


Name of contact:                                           Rachel Fell

Address of contact:                                        Cookson Group plc
                                                           165 Fleet Street
                                                           London EC4A 2AE

Telephone number of contact:                               020 7822 0000


Name of person making return: Rachel S Fell, Deputy Secretary, Cookson Group
plc.



                        BLOCK LISTING SIX MONTHLY RETURN


Date: 3 July 2006

Name of applicant:                                         Cookson Group plc

Name of scheme:                                            Cookson Group Executive Share Option Schemes

Period of return:                           From:          01/01/2006             To:        30/06/2006

Balance under scheme from previous return:                 4,073,444 Ordinary 10p Shares
The amount by which the block scheme has been increased,
if the scheme has been increased since the date of the
last return:

Number of securities issued/allotted under scheme during   1,977,784 Ordinary 10p Shares
period:

Balance under scheme not yet issued/allotted at end of      2,095,660 Ordinary 10p Shares
period

Number and class of securities originally listed and the   3,500,000 Ordinary 1p Shares (March 1998)
date of admission
                                                           2,500,000 Ordinary 1p Shares (January 2005)

                                                           185,778 Ordinary 10p Shares (May 2005)

                                                           4,000,000 Ordinary 10p Shares (December 2005)

Total number of securities in issue at the end of the      192,715,468 Ordinary 10p Shares
period


Name of contact:                                           Rachel Fell

Address of contact:                                        Cookson Group plc
                                                           165 Fleet Street
                                                           London EC4A 2AE

Telephone number of contact:                               020 7822 0000


Name of person making return: Rachel S Fell, Deputy Secretary, Cookson Group
plc.




                        BLOCK LISTING SIX MONTHLY RETURN


Date: 3 July 2006

Name of applicant:                                         Cookson Group plc

Name of scheme:                                            Cookson Employee Share Savings Scheme

Period of return:                           From:          01/01/2006             To:        30/06/2006

Balance under scheme from previous return:                 1,235,491 Ordinary 10p Shares

The amount by which the block scheme has been increased,
if the scheme has been increased since the date of the
last return:

Number of securities issued/allotted under scheme during    124,059 Ordinary 10p Shares
period:

Balance under scheme not yet issued/allotted at end of       1,111,432 Ordinary 10p Shares
period

Number and class of securities originally listed and the   1,500,000 Ordinary 1p Shares (February 1996)
date of admission
                                                           2,500,000 Ordinary 1p Shares (January 2005)

                                                           290,612 Ordinary 10p Shares (May 2005)

                                                           1,500,000 Ordinary 10p Shares (December 2005)

Total number of securities in issue at the end of the      192,715,468 Ordinary 10p Shares
period


Name of contact:                                           Rachel Fell

Address of contact:                                        Cookson Group plc
                                                           165 Fleet Street
                                                           London EC4A 2AE

Telephone number of contact:                               020 7822 0000


Name of person making return: Rachel S Fell, Deputy Secretary, Cookson Group
plc.


                      This information is provided by RNS
            The company news service from the London Stock Exchange