Additional Listing

Centrica PLC
                  

                                  Centrica plc

                              --------------------

Application has been made to the Financial Services Authority and the London
Stock Exchange Plc for a total of 35,000,000 ordinary shares of 6 14/81 pence
each ('shares') to be admitted to the Official List.

It is expected that admission will be granted on 26 April 2007 and that trading
will commence 27 April 2007.

These shares are being reserved under block listings and will be issued as a
result of the exercise of share options pursuant to the following schemes:

-0-
*T
                          Schemes                            Shares
Centrica Executive Share Option Scheme                     10,000,000
Centrica Sharesave Scheme                                  25,000,000
*T

When issued, these shares will rank pari passu with the existing ordinary
shares.