Blocklisting Interim Review

SIG PLC
03 August 2006

                    BLOCKLISTING SIX MONTHLY REVIEW


1. NAME OF COMPANY:


   SIG PLC


2. NAME OF SCHEME:


   THE SHEFFIELD INSULATIONS GROUP PLC - SAVINGS RELATED SHARE OPTION SCHEME


3. PERIOD OF RETURN:     FROM:            TO:

                         4 FEBRUARY 2006  3 AUGUST 2006


4. NUMBER AND CLASS OF SHARE(S)
   (AMOUNT OF STOCK/DEBT SECURITY)
   NOT ISSUED UNDER SCHEME
   AT END OF THE LAST PERIOD:

   449,570 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:

   449,570 ORDINARY 10P SHARES


7. NUMBER AND CLASS OF SHARE(S) 
   (AMOUNT OF STOCK/DEBT SECURITIES) 
   ORIGINALLY LISTED AND THE DATE OF ADMISSION:

   949,752 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 3 AUGUST 2006 WAS 123,014,387


CONTACT FOR QUERIES               

NAME:                             R C MONRO

TELEPHONE:                        0114 285 6355


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