Centrica(CNA)

SCHEDULE 5

BLOCKLISTING SIX MONTHLY RETURN

1. Name of company

Centrica plc

2. Name of scheme

Centrica Sharesave scheme

3. Period of return: From 01/11/2007 to 30/04/2008

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end of

last period

17,072,971 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

1,625,450 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

33,447,521 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 to update our records

3,684,901,054 as at 30 April 2008

Contact for Queries:

Name: Julia Foo

Tel: 01753 494 016

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 01/11/2007 to 30/04/2008

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end

of last period

8,345,715 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

177,102 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

8,168,613 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

3,684,901,054 as at 30 April 2008

Contact for Queries:

Name: Julia Foo

Tel: 01753 494 016

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 01/11/2007 to 30/04/2008

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end

of last period

307,750 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

290,951 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

516,799 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

3,684,901,054 as at 30 April 2008

Contact for Queries:

Name: Julia Foo

Tel: 01753 494 016

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 01/11/2007 to 30/04/2008

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end

of last period

777,057 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

3,267,332 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

7,509,725 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

3,684,901,054 as at 30 April 2008

Contact for Queries:

Name: Julia Foo

Tel: 01753 494 016

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 01/11/2007 to 30/04/2008

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

654,102 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

2,345,898 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

3,684,901,054 as at 30 April 2008

Contact for Queries:

Name: Julia Foo

Tel: 01753 494 016

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 01/11/2007 to 30/04/2008

4. Number and class of shares(s)

(amount of stock/debt security)

not issued under scheme at end

of last period

24,508 ORDINARY 6 14/81p

5. Number of shares issued/allotted

under scheme during period

16,044 ORDINARY 6 14/81p

6. Balance under scheme not yet issued/allotted

at end of period

108,464 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

3,684,901,054 as at 30 April 2008

Contact for Queries:

Name: Julia Foo

Tel: 01753 494 016

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

Copyright Business Wire 2008