Director/PDMR Shareholding

National Grid PLC
04 September 2007

4 September 2007

National Grid plc

Directors' Interests in National Grid plc Ordinary Shares

National Grid plc has today received confirmation of the following dealing by
Mark Fairbairn:

National Grid Sharesave Scheme

On 3rd September 2007 Mark Fairbairn exercised a Sharesave option, granted to
him in June 2002 over 833 shares, at an option price of 397p on its five year
maturity.

His total beneficial interest remains unchanged.

Contact: Robin Kerner, Assistant Secretary- Share Schemes (0207 004 3223).




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