Blocklisting Interim Review

Centrica PLC
                  


SCHEDULE 5

BLOCKLISTING SIX MONTHLY RETURN

1. Name of company

   Centrica plc

2. Name of scheme

   Centrica Sharesave scheme

3. Period of return:     From    01/05/2005        to 31/10/2005

4. Number and class of shares(s) 
   (amount of stock/debt security)
   not issued under scheme at end of
            last period
 
   8,358,700 ORDINARY 6 14/81p

5. Number of shares issued/allotted
   under scheme during period

   6,127,568

6. Balance under scheme not yet issued/allotted 
   at end of period

   2,231,132

7. Number and class of share(s) 
   (amount of stock/debt securities) 
   originally listed and the date of admission

   8,246,046  ORDINARY 6 14/81p  25/10/2004
            10,000,000 ORDINARY 6 14/81p  24/03/2005
   

Please confirm total number of shares in issue at the end of the period in order
for us to update our records

         3,638,117,594 as at 31 October 2005


         Contact for Queries:

         Name : Robin Healy
         Tel:   [phone]

         Address: Centrica plc, Millstream, Maidenhead Road, Windsor, Berks SL4 5GD











SCHEDULE 5

BLOCKLISTING SIX MONTHLY RETURN



1. Name of company

   Centrica plc

2. Name of scheme

   Centrica Executive Share Option scheme

3. Period of return:     From    01/05/2005        to 31/10/2005

4. Number and class of shares(s) 
   (amount of stock/debt security)
   not issued under scheme at end 
            of last period
 
   4,959,070 ORDINARY 6 14/81p

5. Number of shares issued/allotted
   under scheme during period

   858,700

6. Balance under scheme not yet issued/allotted 
   at end of period

   4,100,370

7. Number and class of share(s) 
   (amount of stock/debt securities) 
   originally listed and the date of admission

    2,628,006  ORDINARY 6 14/81p 25/10/2004
             5,000,000  ORDINARY 6 14/81p 04/04/2005

Please confirm total number of shares in issue at the end of the period in order
for us to update our records

   3,638,117,594 as at 31 October 2005

      Contact for Queries:

         Name : Robin Healy
         Tel:   [phone]

         Address: Centrica plc, Millstream, Maidenhead Road, Windsor, Berks SL4 5GD













SCHEDULE 5

BLOCKLISTING SIX MONTHLY RETURN



1. Name of company

   Centrica plc

2. Name of scheme

   Centrica Share Incentive Plan

3. Period of return:     From    01/05/2005        to 31/10/2005

4. Number and class of shares(s) 
   (amount of stock/debt security)
   not issued under scheme at end 
            of last period
 
            1,879,153 ORDINARY 6 14/81p


5. Number of shares issued/allotted
   under scheme during period

   383,525

6. Balance under scheme not yet issued/allotted 
   at end of period

   1,495,628

7. Number and class of share(s) 
   (amount of stock/debt securities) 
   originally listed and the date of admission

    265,283   ORDINARY 6 14/81p 25/10/2004
             2,000,000 ORDINARY 6 14/81p 17/02/2005

Please confirm total number of shares in issue at the end of the period in order
for us to update our records

   3,638,117,594 as at 31 October 2005

      Contact for Queries:

         Name : Robin Healy
         Tel:   [phone]

         Address: Centrica plc, Millstream, Maidenhead Road, Windsor, Berks SL4 5GD