Transaction in Own Shares

National Grid PLC
29 May 2007



National Grid plc

29 May 2007

National Grid plc announces that on 25 May 2007 it purchased for cancellation
730,000 of its ordinary shares at a price of 775.95 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 2,697,320,553





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