Quest Operation

National Grid PLC
29 July 2005

National Grid plc (NG)

29 July 2005

QUALIFYING EMPLOYEE SHARE OWNERSHIP TRUST (Quest)

(Notification of Directors' Interests pursuant to Section 324(2) of the
Companies Act 1985)

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Today, each of the following National Grid plc Executive Directors: E M Astle, S
J Holliday, S Lucas, N P Winser, and R J Urwin, technically ceased to be
interested in 5,790 NG Ordinary shares, by virtue of the Quest transferring the
shares to employees.

(Note: For Companies Act purposes, the Executive Directors named above are
deemed to have a technical interest in the shares held in National Grid's Quest,
together with all participating employees. The interest ceases when shares are
transferred to participants who exercise their Sharesave scheme options.)

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


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