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 01/11/2009 to 04/05/2010

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

34,679,700 ORDINARY 6 14/81p

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

800,283 ORDINARY 6 14/81p

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

33,879,417 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

5,145,221,962 as at 1 May 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 01/11/2009 to 04/05/2010

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

9,955,751 ORDINARY 6 14/81p

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

6,371,339 ORDINARY 6 14/81p

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

3,584,412 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

5,145,221,962 as at 1 May 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 01/11/2009 to 04/05/2010

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

4,268,592 ORDINARY 6 14/81p

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

437,991 ORDINARY 6 14/81p

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

3,830,601 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

5,145,221,962 as at 1 May 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 01/11/2009 to 04/05/2010

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

10,326,808 ORDINARY 6 14/81p

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

3,168,149 ORDINARY 6 14/81p

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

7,158,659 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

5,145,221,962 as at 1 May 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 01/11/2009 to 04/05/2010

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

6,047,240 ORDINARY 6 14/81p

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

1,454,485 ORDINARY 6 14/81p

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

4,592,755 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

5,145,221,962 as at 1 May 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 01/11/2009 to 04/05/2010

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

217,167 ORDINARY 6 14/81p

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

27,089 ORDINARY 6 14/81p

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

190,078 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

5,145,221,962 as at 1 May 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 01/11/2009 to 04/05/2010

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

3,500,000 ORDINARY 6 14/81p

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

2,862,085 ORDINARY 6 14/81p

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

637,915 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

5,145,221,962 as at 1 May 2010

Contact for Queries:

Name: Matthew Lodge

Tel: [phone]

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