Rule 2.10 Announcement

Rule 2.10 Announcement

Centrica PLC

29 December 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 26 December 2008, it had 5,107,658,569 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 Centrica Media Relations: 0845 072 8001