Director/PDMR Shareholding

National Grid PLC
03 November 2005


3 November 2005

National Grid plc ('NG')
Directors' Interests
(Interests Notified by the Trustee for the
Lattice Group Long Term Incentive Scheme (the 'LTIS'))

NG yesterday received a notification from Mourant & Co. Trustees Limited, as
Trustee of the Lattice Group Employees Share Trust operated in conjunction with
the LTIS, in respect of awards which were rolled over on the merger of National
Grid and Lattice Group in October 2002.

2001 LTIS

On the merger Steve Lucas agreed to roll over his award over 96,589 NG ordinary
shares. Following subsequent dividend reinvestments by the Trustee within the
final one year retention period set under the rules of the Scheme, which ended
on 2 November 2005, the total holding rose to 101,057 NG shares. After the
Trustee disposed of 41,517 shares in the market yesterday at 511.53p to settle
tax and National Insurance requirements, a balance of 59,540 shares have been
transferred directly to Steve Lucas.

Following these events, Steve Lucas is interested in a total of 576,964 NG
ordinary shares and 318 B shares (unchanged).



(Note: For Companies Act purposes, Steve Lucas is deemed to have a technical
interest in all the shares held by the LTIS Trustee, together with all
participating employees. This interest ceases when shares are transferred to
participants of the LTIS and this is the final such release under the LTIS
Scheme.)

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


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