Rule 2.10 Announcement

Centrica PLC
                  26 September 2008

Disclosure in accordance with Rule 2.10 of the City Code

In accordance with Rule 2.10 of the City Code on Takeovers and Mergers, Centrica
plc confirms that at the close of business on 25 September 2008, it had
3,712,068,087 ordinary shares of 6 14/81p each in issue. The ISIN reference for
the shares is GB00B033F229.

Enquiries:

Centrica Investor Relations: 01753 494900

Centrica Media Relations: 0845 072 8001