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 01/05/2007 to 31/10/2007

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end of

last period

24,653,631 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

7,580,660 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

17,072,971 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

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

in order for us to update our records

3,678,870,073 as at 31 OCTOBER 2007

Contact for Queries:

Name: Tracy Allen

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 01/05/2007 to 31/10/2007

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end

of last period

9,310,666 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

964,951 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

8,345,715 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

3,678,870,073 as at 31 October 2007

Contact for Queries:

Name: Tracy Allen

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 01/05/2007 to 31/10/2007

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end

of last period

548,147 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

240,397 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

307,750 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

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

in order for us to update our records

3,678,870,073 as at 31 October 2007

Contact for Queries:

Name: Tracy Allen

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 01/05/2007 to 31/10/2007

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end

of last period

965,006 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

187,949 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

777,057 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

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

in order for us to update our records

3,678,870,073 as at 31 October 2007

Contact for Queries:

Name: Tracy Allen

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 01/05/2007 to 31/10/2007

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end

of last period

2,000,000 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

0 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

2,000,000 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

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

in order for us to update our records

3,678,870,073 as at 31 October 2007

Contact for Queries:

Name: Tracy Allen

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 01/05/2007 to 31/10/2007

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end

of last period

42,928 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

18,420 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

24,508 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

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

in order for us to update our records

3,678,870,073 as at 31 October 2007

Contact for Queries:

Name: Tracy Allen

Tel: [phone]

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