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: 29/10/2011 to 30/04/12

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

19,664,633 ORDINARY 6 14/81p (restated)

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

817,400 ORDINARY 6 14/81p

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

18,847,233 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

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

5,183,959,826 as at 30 April 2012

Contact for Queries:

Name: Claire Spencer
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: 29/10/2011 to 30/04/12

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

3,841,536 ORDINARY 6 14/81p

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

224,826 ORDINARY 6 14/81p

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

3,616,710 ORDINARY 6 14/81p

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

2,628,006 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

2,373,098 ORDINARY 6 14/81p 05/04/2011

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

5,183,959,826 as at 30 April 2012

Contact for Queries:

Name: Claire Spencer
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: 29/10/2011 to 30/04/12

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

2,428,076 ORDINARY 6 14/81p (restated)

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

582,702 ORDINARY 6 14/81p

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

1,845,374 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

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

5,183,959,826 as at 30 April 2012

Contact for Queries:

Name: Claire Spencer
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: 29/10/2011 to 30/04/12

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

9,081,217 ORDINARY 6 14/81p

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

2,439,451 ORDINARY 6 14/81p

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

6,641,766 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

6,000,000 ORDINARY 6 14/81p 05/04/2011

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

5,183,959,826 as at 30 April 2012

Contact for Queries:

Name: Claire Spencer
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: 29/10/2011 to 30/04/12

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

4,573,189 ORDINARY 6 14/81p (restated)

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

3,074,989 ORDINARY 6 14/81p

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

1,498,200 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

2,500,000 ORDINARY 6 14/81p 17/10/2011

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

5,183,959,826 as at 30 April 2012

Contact for Queries:

Name: Claire Spencer
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 Employee Share Purchase Plan

3. Period of return:

From: 29/10/2011 to 30/04/12

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

262,984 ORDINARY 6 14/81p

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

39,099 ORDINARY 6 14/81p

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

223,885 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

200,000 ORDINARY 6 14/81p 05/04/2011

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

5,183,959,826 as at 30 April 2012

Contact for Queries:

Name: Claire Spencer
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: 29/10/2011 to 30/04/12

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

3,351,913 ORDINARY 6 14/81p

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

4,316,010 ORDINARY 6 14/81p

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

1,035,903 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

3,500,000 ORDINARY 6 14/81p 05/04/2011

2,000,000 ORDINARY 6 14/81p 17/10/2011

2,000,000 ORDINARY 6 14/81p 14/03/2012

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

5,183,959,826 as at 30 April 2012

Contact for Queries:

Name: Claire Spencer
Tel: [phone]
Address: Centrica plc, Millstream, Maidenhead Road, Windsor, Berks SL4 5GD