Transaction in Own Shares

National Grid PLC
22 January 2008


National Grid plc - Transaction in Own Shares

22 January 2008


National Grid plc announces that on 21 January 2008 it purchased 618,267 of its
ordinary shares at a price of 810.1339 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 2,538,985,227 and the
number of ordinary shares in Treasury will be 42,928,289.


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