Purchase of ordinary shares of 6 14/81 pence in Centrica plc ("Shares" and the
"Company", respectively) by Directors of the Company and Persons Discharging
Managerial Responsibility (PDMRs) under its Share Incentive Plan ("SIP").

The SIP trustee, Equiniti Share Plan Trustees Limited (the "Trustee"), notified
the Company on 21 July 2008 that:

(1) The following Directors and other Persons Discharging Managerial
Responsibility for the Company acquired Shares under the SIP on 21 July 2008
held through the Trustee:

                                 Number                    Aggregate Shares held
                                 of Shares                 Beneficially (across all accounts
Directors                        Acquired*                 following acquisition)
Phil Bentley                     62                        699,983
Sam Laidlaw                      63                        342,415
Nick Luff                        62                        200,692

Persons Discharging Managerial
 Responsibility
Jake Ulrich                      62                        919,111
Grant Dawson                     62                        331,708
Catherine May                    62                        6,618
Anne Minto                       62                        231,974
Chris Weston                     62                        154,026

* The 'Number of Shares Acquired' includes 42 Partnership shares (43 Partnership
shares for Sam Laidlaw with a higher residual balance) acquired at 292.25 pence
per share and 20 Matching shares acquired at 293.25 pence per share. Both
Partnership and Matching elements are registered in the name of the Trustee.

(2) They had transferred 20,000 ordinary shares of 6 14/81 pence each from
Equiniti Corporate Nominees Limited AESOP1 (Allocated shares) to Equiniti
Corporate Nominees Limited AESOP2 (Unallocated shares). The transfer was made
following the forfeiture of shares, under the rules of the SIP, by participants
who have left the group since the last purchase and the shares had been used
towards July's allocation of Matching shares. The Directors and PDMRs listed
above, together with some 5,102 other employees, are participants in the SIP and
are potentially interested in the remaining 1,033 shares held by Equiniti
Corporate Nominee Limited AESOP2 left following the purchase.

The SIP operates as follows

-- Each month the Trustee uses participants' contributions (which may not
exceed £125 per participant per month) to purchase shares in the market.
These shares are called 'Partnership Shares'.

-- At the same time the Company allots to participants via the Trustee one
'Matching Share' for every two partnership shares purchased that month
(up to a maximum of 20 matching shares per month).

-- Participants may change their monthly savings rate whenever they wish.
However, Directors and others bound by the Company's Securities Dealing
Code (the "Code") may not make such a change during a close period or
when otherwise prohibited from dealing by the Code.

Julia Foo
Centrica plc
01753 494016

Copyright Business Wire 2008