Holding(s) in Company -2-

|                             |                |                                        | instrument is                     |                | 
|                             |                |                                        | exercised/                        |                | 
|                             |                |                                        | converted.                        |                | 
+-----------------------------+----------------+----------------------------------------+-----------------------------------+----------------+ 
| N/A                         |                |                                        |                                   |                | 
+-----------------------------+----------------+----------------------------------------+-----------------------------------+----------------+ 
|                                                                                                                                            | 
+--------------------------------------------------------------------------------------------------------------------------------------------+ 
| C: Financial Instruments with similar economic effect to Qualifying Financial                                                              | 
| Instruments xv, xvi                                                                                                                        | 
+--------------------------------------------------------------------------------------------------------------------------------------------+ 
| Resulting situation after the triggering transaction                                                                                       | 
+--------------------------------------------------------------------------------------------------------------------------------------------+ 
| Type of                 | Exercise price | Expiration         | Exercise/    | Number of                 | % of voting                     | 
| financial               |                | date xvii          | Conversion   | voting rights             | rights xix, xx                  | 
| instrument              |                |                    | period xviii | instrument                |                                 | 
|                         |                |                    |              | refers to                 |                                 | 
|                         |                |                    |              |                           |                                 | 
+-------------------------+----------------+--------------------+--------------+---------------------------+---------------------------------+ 
| N/A                     |                |                    |              |                           | Nominal                | Delta  | 
+                         +                +                    +              +                           +------------------------+--------+ 
|                         |                |                    |              |                           |                        |        | 
+-------------------------+----------------+--------------------+--------------+---------------------------+------------------------+--------+ 
|                                                                                                                                            | 
+--------------------------------------------------------------------------------------------------------------------------------------------+ 
| Total (A+B+C)                                                                                                                              | 
+--------------------------------------------------------------------------------------------------------------------------------------------+ 
| Number of voting rights                                                  | Percentage of voting rights                                     | 
+--------------------------------------------------------------------------+-----------------------------------------------------------------+ 
| 136,319,674                                                              | 91.02%                                                          | 
+--------------------------------------------------------------------------+-----------------------------------------------------------------+ 
| 9. Chain of controlled undertakings through which the voting rights and/or the                                                             | 
| financial instruments are effectively held, if applicable: xxi                                                                             | 
+--------------------------------------------------------------------------------------------------------------------------------------------+ 
| CENTRICA RESOURCES (UK) LIMITED DIRECTLY HOLDS THE VOTING RIGHTS WHICH ARE THE SUBJECT OF                                                  | 
| THIS NOTIFICATION AND IT IS A WHOLLY-OWNED SUBSIDIARY OF GB GAS HOLDINGS LIMITED. GB GAS                                                   | 
| HOLDINGS LIMITED IS A WHOLLY-OWNED SUBSIDIARY OF CENTRICA HOLDINGS LIMITED WHICH, IN TURN,                                                 | 
| IS A WHOLLY-OWNED SUBSIDIARY OF CENTRICA PLC.                                                                                              | 
|                                                                                                                                            | 
+--------------------------------------------------------------------------------------------------------------------------------------------+ 
| Proxy Voting:                                                                                                                              | 
+--------------------------------------------------------------------------------------------------------------------------------------------+ 
| 10. Name of the proxy holder:                                                             |                                            N/A | 
+-------------------------------------------------------------------------------------------+------------------------------------------------+ 
| 11. Number of voting rights proxy holder will cease                                       |                                            N/A | 
| to hold:                                                                                  |                                                | 
+-------------------------------------------------------------------------------------------+------------------------------------------------+ 
| 12. Date on which proxy holder will cease to hold                                         |                                            N/A | 
| voting rights:                                                                            |                                                | 
+-------------------------------------------------------------------------------------------+------------------------------------------------+ 
|                                                                                                                                            | 
+--------------------------------------------------------------------------------------------------------------------------------------------+ 
| 13. Additional information:                                              | The total number of voting rights in the                        | 
|                                                                          | issuer used to calculate the percentages                        | 
|                                                                          | in this notification is 149,769,828, being                      | 
|                                                                          | the number disclosed by the issuer to the                       | 
|                                                                          | market on 18 March 2009 pursuant to Rule                        | 
|                                                                          | 2.10 of the City Code on Takeovers and                          | 
|                                                                          | Mergers.                                                        | 
|                                                                          |                                                                 | 
+--------------------------------------------------------------------------+-----------------------------------------------------------------+ 
| 14. Contact name:                                                        |                                                     PHIL RAPER  | 
+--------------------------------------------------------------------------+-----------------------------------------------------------------+ 
| 15. Contact telephone number:                                            |                                                   020 7774 1000 | 
+------------+------------+---+---+--------+---+---+------------+----------+---+--------+---+---+----------+-----------+----+---+---+--------+ 
 
 
Name and signature of duly authorised officer of the listed company responsible 
for making this notification 
 
 
+-----------------------------------------------------------------------+ 
| SIMON WAITE                                                           | 
+-----------------------------------------------------------------------+ 
 
 
Date of notification 
 
 
+-----------------------------------------------------------------------+ 
| 22 september 2009                                                     | 
+-----------------------------------------------------------------------+ 
 
 
 
This information is provided by RNS 
            The company news service from the London Stock Exchange 
   END 
 
 HOLEAENAAFANEFE