Transaction in Own Shares

National Grid PLC
25 January 2008

National Grid plc - Transaction in Own Shares

25 January 2008

National Grid plc announces that on 24 January 2008 it purchased 454,597 of its
ordinary shares at a price of 764.1215 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 2,535,761,782 and the
number of ordinary shares in Treasury will be 46,151,734.


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