Blocklisting Interim Review

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 04/05/2010 to 09/11/2010

4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period

33,862,593 ORDINARY 6 14/81p (restated due to administrative error in previous return)

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

6,792,501 ORDINARY 6 14/81p

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

27,070,092 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
36,000,000 ORDINARY 6 14/81p 06/05/2009

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

5,153,700,134 at 9 November 2010

Contact for Queries:

Name: Matthew Lodge

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 04/05/2010 to 09/11/2010

4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period

3,601,236 ORDINARY 6 14/81p (restated due to administrative error in previous return)

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

961,509 ORDINARY 6 14/81p

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

2,639,727 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
10,000,000 ORDINARY 6 14/81p 06/05/2009

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

5,153,700,134 at 9 November 2010

Contact for Queries:

Name: Matthew Lodge

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 04/05/2010 to 09/11/2010

4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period

3,830,601 ORDINARY 6 14/81p

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

497,249 ORDINARY 6 14/81p

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

3,333,352 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
5,000,000 ORDINARY 6 14/81p 06/05/2009

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

5,153,700,134 at 9 November 2010

Contact for Queries:

Name: Matthew Lodge

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 04/05/2010 to 09/11/2010

4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period

7,158,659 ORDINARY 6 14/81p

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

151,364 ORDINARY 6 14/81p

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

7,007,295 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
10,000,000 ORDINARY 6 14/81p 06/05/2009

Please confirm total number of shares in issue at the end of the period

in order for us to update our records

5,153,700,134 at 9 November 2010

Contact for Queries:

Name: Matthew Lodge

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 04/05/2010 to 09/11/2010

4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period

4,592,755 ORDINARY 6 14/81p

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

25,045 ORDINARY 6 14/81p

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

4,567,710 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
5,000,000 ORDINARY 6 14/81p 06/05/2009

Please confirm total number of shares in issue at the end of the period

in order for us to update our records

5,153,700,134 at 9 November 2010

Contact for Queries:

Name: Matthew Lodge

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 04/05/2010 to 09/11/2010

4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period

190,078 ORDINARY 6 14/81p

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

44,562 ORDINARY 6 14/81p

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

145,516 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
200,000 ORDINARY 6 14/81p 06/05/2009

Please confirm total number of shares in issue at the end of the period

in order for us to update our records

5,153,700,134 at 9 November 2010

Contact for Queries:

Name: Matthew Lodge

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 Deferred and Matching Share Scheme

3. Period of return:

From 04/05/2010 to 09/11/2010

4. Number and class of shares(s) (amount of stock/debt security) not issued under scheme at end of last period

637,915 ORDINARY 6 14/81p

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

5,942 ORDINARY 6 14/81p

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

631,973 ORDINARY 6 14/81p

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

3,500,000 ORDINARY 6 14/81p 29/03/2010

Please confirm total number of shares in issue at the end of the period

in order for us to update our records

5,153,700,134 at 9 November 2010

Contact for Queries:

Name: Matthew Lodge

Tel: [phone]

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