Rule 2.10 Announcement

Centrica PLC
                  

20 August 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 19 August 2008, it had
3,709,898,618 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