Transaction in Own Shares

National Grid PLC
25 June 2007


National Grid plc - Transaction in Own Shares

25 June 2007

National Grid plc announces that on 22 June 2007 it purchased 2,750,000 of its
ordinary shares at a price of 721.11 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
7,280,000 and the number of ordinary shares with voting rights in issue
(excluding Treasury shares) will be 2,668,826,035.

End




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