Blocklisting Interim Review

Centrica PLC -0- *T SCHEDULE 5 BLOCKLISTING SIX MONTHLY RETURN 1. Name of company Centrica plc 2. Name of scheme Centrica Sharesave scheme 3. Period of return: From 01/05/2006 to 31/10/2006 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 26,025,352 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 24,523,027 6. Balance under scheme not yet issued/allotted at end of period 1,502,325 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 25,000,000 ORDINARY 6 14/81p 27/04/2006 Please confirm total number of shares in issue at the end of the period in order for us to update our records 3,661,418,392 as at 31 October 2006 Contact for Queries: Name : Philip Davies Tel: 01753 494 012 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 01/05/2006 to 31/10/2006 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 7,317,352 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 6,148,505 6. Balance under scheme not yet issued/allotted at end of period 1,168,847 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 10,000,000 ORDINARY 6 14/81p 24/03/2006 Please confirm total number of shares in issue at the end of the period in order for us to update our records 3,661,418,392 as at 31 October 2006 Contact for Queries: Name : Philip Davies Tel: 01753 494 012 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 01/05/2006 to 31/10/2006 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 1,138,133 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 319,857 6. Balance under scheme not yet issued/allotted at end of period 818,276 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 3,661,418,392 as at 31 October 2006 Contact for Queries: Name: Philip Davies Tel: 01753 494 012 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 Long Term Incentive Scheme 3. Period of return: From 01/05/2006 to 31/10/2006 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 2,766,334 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 326,100 6. Balance under scheme not yet issued/allotted at end of period 2,440,234 7. Number and class of share(s) (amount of stock/debt securities) originally listed and the date of admission 10,000,000 ORDINARY 6 14/81p 03/03/2006 Please confirm total number of shares in issue at the end of the period in order for us to update our records 3,661,418,392 as at 31 October 2006 Contact for Queries: Name: Philip Davies Tel: 01753 494 012 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 Award Scheme 3. Period of return: From 01/05/2006 to 31/10/2006 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 0 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 0 6. Balance under scheme not yet issued/allotted at end of period 2,000,000 7. Number and class of share(s) (amount of stock/debt securities) originally listed and the date of admission 2,000,000 ORDINARY 6 14/81p 24/08/2006 Please confirm total number of shares in issue at the end of the period in order for us to update our records 3,661,418,392 as at 31 October 2006 Contact for Queries: Name: Philip Davies Tel: 01753 494 012 Address: Centrica plc, Millstream, Maidenhead Road, Windsor, Berks SL4 5GD ------------------------------------------------------------------------------------------------ *T

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