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    01/11/2005        to 30/04/2006

4. Number and class of shares(s) 
   (amount of stock/debt security)
   not issued under scheme at end of
   last period
 
   2,231,132 ORDINARY 6 14/81p

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

   1,205,780

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

   26,025,352

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

   3,630,100,903 as at 30 April 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    01/11/2005        to 30/04/2006

4. Number and class of shares(s) 
   (amount of stock/debt security)
   not issued under scheme at end 
            of last period
 
   4,186,487 ORDINARY 6 14/81p

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

   6,869,135

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

   7,317,352

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

    3,630,100,903 as at 30 April 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    01/11/2005        to 30/04/2006

4. Number and class of shares(s) 
   (amount of stock/debt security)
   not issued under scheme at end 
            of last period
 
            1,495,628 ORDINARY 6 14/81p


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

   357,495

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

   1,138,133

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

   3,630,100,903 as at 30 April 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    01/11/2005        to 30/04/2006

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

   7,233,666

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

   2,766,334

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

    3,630,100,903 as at 30 April 2006

      Contact for Queries:

Name: Philip Davies
Tel:   [phone]

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