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: [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 01/05/2008 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: [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 01/05/2008 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: [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 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: [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 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: [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 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: [phone]

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