Blocklisting Interim Review

Cookson Group PLC
04 January 2006

                        BLOCK LISTING SIX MONTHLY RETURN



Date:  4 January 2006


Name of applicant:                                         Cookson Group plc
Name of scheme:                                            Cookson Group US Stock Purchase Plan
Period of return:                           From:          01/07/2005             To:        31/12/2005
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   0
period:
Balance under scheme not yet issued/allotted at end of     448,379 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      190,350,294 Ordinary 10p Shares
period


Name of contact:                                           Rachel Fell
Address of contact:                                        Cookson Group plc

                                                           265 Strand

                                                           London WC1R 1DB
Telephone number of contact:                               020 7061 6562


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







                        BLOCK LISTING SIX MONTHLY RETURN



Date:  4 January 2006




Name of applicant:                                         Cookson Group plc
Name of scheme:                                            Cookson Group Executive Share Option Schemes
Period of return:                           From:          01/07/2005             To:        31/12/2005
Balance under scheme from previous return:                 185,778 Ordinary 10p Shares
The amount by which the block scheme has been increased,   4,000,000 Ordinary 10p Shares
if the scheme has been increased since the date of the
last return:
Number of securities issued/allotted under scheme during   112,334 Ordinary 10p Shares
period:
Balance under scheme not yet issued/allotted at end of     4,073,444 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      190,350,294 Ordinary 10p Shares
period


Name of contact:                                           Rachel Fell
Address of contact:                                        Cookson Group plc

                                                           265 Strand

                                                           London WC1R 1DB
Telephone number of contact:                               020 7061 6562



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







                        BLOCK LISTING SIX MONTHLY RETURN



Date:  4 January 2006


Name of applicant:                                         Cookson Group plc
Name of scheme:                                            Cookson Employee Share Savings Scheme
Period of return:                           From:          01/07/2005             To:        31/12/2005
Balance under scheme from previous return:                 290,612 Ordinary 10p Shares
The amount by which the block scheme has been increased,   1,500,000 Ordinary 10p Shares
if the scheme has been increased since the date of the
last return:
Number of securities issued/allotted under scheme during   555,121 Ordinary 10p Shares
period:
Balance under scheme not yet issued/allotted at end of      1,235,491 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      190,350,294 Ordinary 10p Shares
period


Name of contact:                                           Rachel Fell
Address of contact:                                        Cookson Group plc

                                                           265 Strand

                                                           London WC1R 1DB
Telephone number of contact:                               020 7061 6562



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






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