Transaction in Own Shares

National Grid PLC
24 January 2008

National Grid plc - Transaction in Own Shares

24 January 2008

National Grid plc announces that on 23 January 2008 it purchased 975,452 of its
ordinary shares at a price of 763.7311 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 2,536,216,379 and the
number of ordinary shares in Treasury will be 45,697,137.





End






                      This information is provided by RNS
            The company news service from the London Stock Exchange