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