Directors Technical Interests

National Grid PLC
06 June 2006


6 June 2006
National Grid plc (NG)

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Interests Notified by the Trustee of the
Lattice Group Employee Share Ownership Trust

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

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NG today received a notification from Lattice Group Trustees Limited, as Trustee
of the Lattice Group Employee Share Ownership Trust (the 'Trust'), operated in
conjunction with the Lattice Group Short Term Incentive Scheme (the 'Scheme').
Following the purchase of a further 40,000 NG shares today, at a market price of
611p per share, Steve Lucas together with other employees formerly with Lattice
Group, have a technical interest in the new balance of 61,015 NG shares held in
the Trust.

(Note: For Companies Act purposes, Steve Lucas is deemed to have a technical
interest in all the shares held in this Trust, together with all participating
employees. The interest ceases when shares are transferred to participants under
the rules of the Scheme.)

Contact: D C Forward, Assistant Secretary (020 7004 3226)


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