Transaction in Own Shares

National Grid PLC
26 September 2007

National Grid plc - Transaction in Own Shares - amendment



The following replaces the 'Transaction in Own Shares' announcement released at
07:00 today RNS Number 4910E.



National Grid plc announces that on 25 September 2007, following the purchase
and upon cancellation of the 609,159 shares, the number of ordinary shares with
voting rights in issue (excluding Treasury shares) will be 2,596,522,136 not
2,556,522,146 as previously stated. All other details remain unchanged and the
full text appears below.



National Grid plc



26 September 2007



National Grid plc announces that on 25 September 2007 it purchased for
cancellation 609,159 of its ordinary shares at a price of 774.1384 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
2,596,522,136 and the number of ordinary shares in Treasury will be 13,597,636.





End






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