Transaction in Own Shares

National Grid PLC
25 May 2007



National Grid plc

25 May 2007


National Grid plc announces that on 24 May 2007 it purchased for cancellation
1,250,000 of its ordinary shares at a price of 780.1450 pence per share from
Deutsche Bank AG London Branch.

Following the purchase and upon the cancellation of these shares, the number of
ordinary shares with voting rights in issue will be 2,698,050,553




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