Director/PDMR Shareholding

National Grid PLC
19 July 2007

19 July 2007

Director's Interests in National Grid plc (NG.) Ordinary Shares
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National Grid Executive Share Option Scheme

Today, the Trustee of the National Grid 1996 Employee Benefit Trust (ESOP)
confirmed that, late on 17 July 2007, Mark Fairbairn exercised the Award made in
June 1998, over 8,649 shares granted at 375.75p. Of these shares, 2,367 are
retained by him, after disposing of 6,282 shares, at a price of 700.18p also on
17 July 2007, to meet exercise costs and statutory deductions.

Mark Fairbairn's total interest after this event is over 318,600 NG. ordinary
shares.


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