Director/PDMR Shareholding

National Grid PLC
28 March 2008



National Grid plc ('National Grid')


28th March 2008


Directors' interests in National Grid plc (NG.) Ordinary Shares



Bob Catell


Late yesterday, 27th March 2007, Bob Catell purchased a further 1,000 ADRs (900
of them at $71.38 each and 100 at $71.37 each), equivalent to 5,000 ordinary
shares.


This takes his total interest to 20,084 ADRs (equivalent to 100,420 ordinary
shares) comprised of options over 85,420 shares and a total of 15,000 held
beneficially. .


Nick Winser


Nick Winser has today notified receiving confirmation of the following
transactions, which were conducted for personal tax planning purposes:


Yesterday, Thursday 27th March 2008, all 62,332 shares registered directly in
his name were sold in the market at 717.85p per share.


Today, in addition to an existing holding of 638 shares, a further 63,362 shares
were purchased by his spouse at 705p per share, increasing her registered
holding to 64,000 ordinary shares


Nick Winser's total interest after this event is 454,878 comprised of options
over 384,941 shares and a total of 69,937 held beneficially.


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D C Forward

Assistant Secretary

0207 004 3226


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