Transaction in Own Shares

Centrica PLC
20 December 2004

Centrica plc

Repurchase of shares

Centrica plc announces that on 20 December 2004 it purchased for cancellation
1,350,000 of its ordinary shares at a price of 227.3094p per share from Morgan
Stanley & Co. International Limited.



Enquiries

Kath Kyle             Centrica plc                                 01753 494902

Jon Bathard-Smith     Morgan Stanley & Co. International Limited   020 7425 8000


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