Blocklisting Interim Review

Cookson Group PLC
02 July 2007

                        BLOCK LISTING SIX MONTHLY RETURN



Date:  2 July 2007


Name of applicant:                                         Cookson Group plc

Name of scheme:                                            Cookson Group Executive Share Option Schemes

Period of return:                           From:          01/01/2007             To:        30/06/2007

Balance under scheme from previous return:                 1,605,031 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   156,161 Ordinary 10p Shares
period:

Balance under scheme not yet issued/allotted at end of     1,448,870 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      193,558,865 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:  2 July 2007


Name of applicant:                                         Cookson Group plc

Name of scheme:                                            Cookson Employee Share Savings Scheme

Period of return:                           From:          01/01/2007             To:        30/06/2007

Balance under scheme from previous return:                 960,354 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   45,529 Ordinary 10p Shares
period:

Balance under scheme not yet issued/allotted at end of     914,825 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      193,558,865 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