Transaction in Own Shares

National Grid PLC
20 June 2007


National Grid plc - Transaction in Own Shares

20 June 2007

National Grid plc announces that on 19 June 2007 it purchased 1,600,000 of its
ordinary shares at a price of 742.25 pence per share from Deutsche Bank AG
London Branch. The purchased shares will be held as Treasury shares.

Following the purchase, the number of ordinary shares in Treasury will be
2,530,000 and the number of ordinary shares with voting rights in issue
(excluding Treasury shares) will be 2,673,576,035.

End




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