Directors Technical Interests

National Grid PLC
12 February 2007

12 February 2007     National Grid plc (NG)


Interests Notified by the Trustee of the National Grid plc Group Employee Share
Trust


(Notification of Directors' Technical Interests,
 Pursuant to Section 324 (2) of the Companies Act 1985)


NG received a notification on Friday 9 February 2007 from Towers Perrin Share
Plan Services (Guernsey) Limited, as Trustee of the National Grid plc Group
Employee Share Trust (the 'Trust'), operated in conjunction with National Grid
Share Award Plan 2004, Performance Share Plan, Share Matching Plan and Deferred
Share Plan (the 'Plan'). Following the purchase of 100,000 Ordinary shares on 9
February, at a market price of 792.8266p per share for future releases under the
Plan, Executive Directors of NG (Steve Holliday, Steve Lucas, Edward Astle, Nick
Winser and Mark Fairbairn) are deemed to have a technical interest in the new
balance of 318,995 NG Ordinary shares held in Trust. The B Shares held by the
Trust remain unchanged.


(Note: For Companies Act purposes, the Executive Directors of NG are deemed to
have a technical interest in all shares held in the Trust, together with all
participating employees. The interest ceases when shares are transferred to
participants by the release of shares from the Trust under the Share Award Plan
or under another employees' share plan.)


Contact D C Forward, Assistant Secretary (0207 004 3226)



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