Transaction in Own Shares

National Grid PLC
20 February 2008

National Grid plc - Transaction in Own Shares



20 February 2008



National Grid plc announces that on 19 February 2008 it purchased 297,299 of its
ordinary shares at a price of 785.2841 pence per share from Morgan Stanley
Securities Limited. The purchased shares will be held as Treasury shares.



Following the purchase of these shares, the number of ordinary shares with
voting rights in issue (excluding Treasury shares) will be 2,529,457,043 and the
number of ordinary shares in Treasury will be 52,456,473.





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