Director/PDMR Shareholding

National Grid PLC
23 September 2005


23 September 2005
National Grid plc (NG)

(Notification of Directors' Interests,
Pursuant to Section 324(2) of the Companies Act 1985)
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Interests Notified by the Trustee for the
Lattice Group Long Term Incentive Scheme (the 'LTIS')

NG today received a notification from Mourant & Co. Trustees, as Trustee of the
Lattice Group Employees Share Trust operated in conjunction with the LTIS.

On 30 August 2005, 2,856 ordinary shares were acquired, at a price of 518.87p
per share, in respect of the August 2005 NG final dividend of 15.2p per share
being reinvested on behalf of Steve Lucas, whose personal interest in the 2001
LTIS award changes as follows:


Director             Existing 2001 Additional ord.     Revised 2001  Total NG
                     LTIS Award    shares from         LTIS          Share Interest after event
                                   dividend            Total
                                   Reinvestment

Steve Lucas          98,201        2,856                101,057      618,481 ordinary shares
                                                                     318  B shares- unchanged


NG Return of Cash- B Share interests

Following the implementation of the Return of Cash to shareholders, we  received
a further notification yesterday that Nick Winser is interested in a further
8,809 B shares in National Grid plc, taking his total B share interests to
20,787. His interest in NG ordinary shares remains unchanged.

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Contact: D C Forward Assistant Secretary
0207 004 3226


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