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 20 May 2008 that:

(1) The following Directors and other Persons Discharging Managerial
Responsibility for the Company acquired Shares under the SIP on 19 May 2008 held
through the Trustee:

                                 Number                    Aggregate Shares held
                                 of Shares                 Beneficially (across all accounts
Directors                        Acquired*                 following acquisition)
Phil Bentley                     62                        680,211
Sam Laidlaw                      62                        342,262
Nick Luff                        63                        200,554
Jake Ulrich                      63                        918,834

Persons Discharging Managerial
 Responsibility
Grant Dawson                     62                        316,092
Catherine May                    63                        6,496
Anne Minto                       62                        231,715
Chris Weston                     63                        153,904

* The 'Number of Shares Acquired' includes 43 Partnership shares (42 Partnership
shares for Sam Laidlaw, Phillip Bentley, Grant Dawson, and Anne Minto with a
lower residual balance) acquired at 296.00 pence per share and 20 Matching
shares acquired at 291.25 pence per share. Both Partnership and Matching
elements are registered in the name of the Trustee.

(2) They had transferred 9,000 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 May's allocation of Matching shares. The Directors and PDMRs listed
above, together with some 5,176 other employees, are participants in the SIP and
are potentially interested in the remaining 9,283 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