Director/PDMR Shareholding

National Grid PLC
04 October 2007



National Grid plc (NG.)

4 October 2007

Directors Interests in Shares - B Shares Conversion


Following the listing of further ordinary shares on 28 September in respect of
the conversion of all outstanding NG 'B' shares, the following Directors'
individual revised interests have been confirmed by the registrars/trustees:


Director         Number of B       Additional Ordinary      Resulting total 
                 Shares            Share Interest           interest in NG. 
                 Converted                                  Ordinary shares
M Fairbairn      6,132             540                      319,687
S Lucas          318               28                       616,642
G Rose           5,025             443                      4,852




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