Transaction in Own Shares

National Grid PLC
17 January 2008


National Grid plc - Transaction in Own Shares


17 January 2008


National Grid plc announces that on 16 January 2008 it purchased 1,532,226 of
its ordinary shares at a price of 814.8803 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 2,540,019,311 and the
number of ordinary shares in Treasury will be 41,894,205.


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