Director/PDMR Shareholding

National Grid PLC
05 September 2006



5 September 2006

National Grid plc (NG)


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



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



NG today received a notification from Towers Perrin Share Plan Services
(Guernsey) Limited, as Trustee of the National Grid Group Employee Share Trust
(the 'Trust'), operated in conjunction with National Grid plc Share Award Plan
2004 (the 'Plan'). Executive Directors (Roger Urwin, Steve Holliday, Steve
Lucas, Mike Jesanis, Edward Astle and Nick Winser) had ceased to be technically
interested in 38,793 NG Ordinary shares, by virtue of the Trustee having
transferred the shares to Plan participants on 1 September 2006.



(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
beneficiaries of the Trust. The interest ceases when shares are transferred to
participants by the release of shares from the Trust under the Plan or under
other employees' share plans operated in conjunction with the Trust.)



Contact R W Kerner, Assistant Secretary (0207 004 3223)


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