Transaction in Own Shares

National Grid PLC
01 October 2007

National Grid plc - Transaction in Own Shares

1 October 2007

National Grid plc announces that on 28 September 2007 it purchased for
cancellation 738,051 of its ordinary shares at a price of 780.3232 pence per
share from Morgan Stanley Securities Limited.

Following the purchase and upon cancellation of these shares, the number of
ordinary shares with voting rights in issue (excluding Treasury shares) will be
2,598,580,089 and the number of ordinary shares in Treasury will be 13,597,636.


End






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