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 01/05/2008 to 31/10/2008 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 33,447,521 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 25,913,613 ORDINARY 6 14/81p 6. Balance under scheme not yet issued/allotted at end of period 7,845,840 ORDINARY 6 14/81p 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 25,000,000 ORDINARY 6 14/81p 24/04/2007 18,000,000 ORDINARY 6 14/81p 15/04/2008 Please confirm total number of shares in issue at the end of the period in order for us update our records 3,713,766,061 as at 31 October 2008 Contact for Queries: Name: Julia Foo Tel: 01753 494 016 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 01/05/2008 to 31/10/2008 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 8,168,613 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 2,401,255 ORDINARY 6 14/81p 6. Balance under scheme not yet issued/allotted at end of period 5,767,358 ORDINARY 6 14/81p 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 10,000,000 ORDINARY 6 14/81p 24/04/2007 Please confirm total number of shares in issue at the end of the period in order for us to update our records 3,713,766,061 as at 31 October 2008 Contact for Queries: Name: Julia Foo Tel: 01753 494 016 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 01/05/2008 to 31/10/2008 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 516,799 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 310,031 ORDINARY 6 14/81p 6. Balance under scheme not yet issued/allotted at end of period 206,768 ORDINARY 6 14/81p 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 500,000 ORDINARY 6 14/81p 15/04/2008 Please confirm total number of shares in issue at the end of the period in order for us to update our records 3,713,766,061 as at 31 October 2008 Contact for Queries: Name: Julia Foo Tel: 01753 494 016 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 01/05/2008 to 31/10/2008 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 7,509,725 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 220,302 ORDINARY 6 14/81p 6. Balance under scheme not yet issued/allotted at end of period 7,289,423 ORDINARY 6 14/81p 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 3,000,000 ORDINARY 6 14/81p 28/03/2007 10,000,000 ORDINARY 6 14/81p 15/04/2008 Please confirm total number of shares in issue at the end of the period in order for us to update our records 3,713,766,061 as at 31 October 2008 Contact for Queries: Name: Julia Foo Tel: 01753 494 016 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 01/05/2008 to 31/10/2008 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 2,345,898 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 3,243 ORDINARY 6 14/81p 6. Balance under scheme not yet issued/allotted at end of period 2,342,655 ORDINARY 6 14/81p 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 1,000,000 ORDINARY 6 14/81p 15/04/2008 Please confirm total number of shares in issue at the end of the period in order for us to update our records 3,713,766,061 as at 31 October 2008 Contact for Queries: Name: Julia Foo Tel: 01753 494 016 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 North American Share Purchase Plan 3. Period of return: From 01/05/2008 to 31/10/2008 4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period 108,464 ORDINARY 6 14/81p 5. Number of shares issued/allotted under scheme during period 16,563 ORDINARY 6 14/81p 6. Balance under scheme not yet issued/allotted at end of period 91,901 ORDINARY 6 14/81p 7. Number and class of share(s) (amount of stock/debt securities) originally listed and the date of admission 50,000 ORDINARY 6 14/81p 22/01/2007 100,000 ORDINARY 6 14/81p 15/04/2008 Please confirm total number of shares in issue at the end of the period in order for us to update our records 3,713,766,061 as at 31 October 2008 Contact for Queries: Name: Julia Foo Tel: 01753 494 016 Address: Centrica plc, Millstream, Maidenhead Road, Windsor, Berks SL4 5GD

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Centrica (CNA)
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