Blocklisting Interim Review

SIG PLC 03 August 2005 BLOCKLISTING SIX MONTHLY REVIEW 1. NAME OF COMPANY: SIG PLC 2. NAME OF SCHEME: THE SHEFFIELD INSULATIONS GROUP PLC - 1989 SHARE OPTION SCHEME 3. PERIOD OF RETURN: FROM: 4 FEBRUARY 2005 TO: 3 AUGUST 2005 4. NUMBER AND CLASS OF SHARE(S) (AMOUNT OF STOCK/DEBT SECURITY) NOT ISSUED UNDER SCHEME AT END OF THE LAST PERIOD: 139,407 ORDINARY 10p SHARES 5. NUMBER OF SHARES ISSUED/ALLOTTED UNDER SCHEME DURING PERIOD: NIL 6. BALANCE UNDER SCHEME NOT YET ISSUED/ALLOTTED AT END OF PERIOD: 139,407 ORDINARY 10p SHARES 7. NUMBER AND CLASS OF SHARE(S) (AMOUNT OF STOCK/DEBT SECURITIES) ORIGINALLY LISTED AND THE DATE OF ADMISSION: 1,176,188 ORDINARY 10p SHARES PLEASE CONFIRM TOTAL NUMBER OF SHARES IN ISSUE AT THE END OF THE PERIOD IN ORDER FOR US TO UPDATE OUR RECORDS. TOTAL NUMBER OF SHARES IN ISSUE AT 3RD AUGUST 2005 WAS 121,776,442 CONTACT FOR QUERIES R C MONRO NAME: RICHARD MONRO TELEPHONE: 0114 285 6355 This information is provided by RNS The company news service from the London Stock Exchange

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