Blocklisting Interim Review

Centrica PLC
                  
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SCHEDULE 5

BLOCKLISTING SIX MONTHLY RETURN

1. Name of company

Centrica plc

2. Name of scheme

Centrica Sharesave scheme

3. Period of return: From 01/05/2006 to 31/10/2006

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

26,025,352 ORDINARY 6 14/81p

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

24,523,027

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

1,502,325

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


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

3,661,418,392 as at 31 October 2006


Contact for Queries:

Name : Philip Davies
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 01/05/2006 to 31/10/2006

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

7,317,352 ORDINARY 6 14/81p

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

6,148,505

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

1,168,847

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

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

3,661,418,392 as at 31 October 2006

Contact for Queries:

Name : Philip Davies
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 01/05/2006 to 31/10/2006

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

1,138,133 ORDINARY 6 14/81p


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

319,857

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

818,276

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

3,661,418,392 as at 31 October 2006

Contact for Queries:

Name: Philip Davies
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 01/05/2006 to 31/10/2006

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

2,766,334 ORDINARY 6 14/81p


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

326,100

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

2,440,234

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


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

3,661,418,392 as at 31 October 2006

Contact for Queries:

Name: Philip Davies
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 01/05/2006 to 31/10/2006

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

0 ORDINARY 6 14/81p


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

0

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

2,000,000

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

3,661,418,392 as at 31 October 2006

Contact for Queries:

Name: Philip Davies
Tel: [phone]

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