Holding(s) in Company

National Grid PLC
09 June 2006



9th June 2006

National Grid plc (National Grid)



Notification of Interest in NG Ordinary Shares,
Pursuant to Section 198 of The Companies Act 1985

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National Grid today received a notification from Morgan Stanley Securities
Limited that its total interest was 3.01% (81,821,422 shares) at 6 June 2006.
(Included in this notification are 76,006,620 shares in which the interest is
pursuant to Section 208(5) of the Companies Act; in respect of the transfer to a
third party on terms giving the right to require return of an equivalent number
of shares.)


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