Director/PDMR Shareholding

National Grid PLC
06 March 2008



6 March 2008


National Grid plc (National Grid)

Notification of Changes in Directors' Interests

-------------------------------------------------------------



Performance Share Plan - Lapse of Awards

The Trustee of the National Grid Group Employee Share Trust has today confirmed
that the following awards made to Executive Directors under the National Grid
Performance Share Plan 2002, in the 2004 operation of the Plan, have lapsed in
full:

Director                                    Number of shares over which award granted-
                                                         and  fully lapsed

Edward Astle                                                  110,326
Mark Fairbairn                                                47,072

Steve Holliday                                                117,681
Steve Lucas                                                   116,210
Nick Winser                                                   98,558


These awards were subject to a performance condition. However the performance
condition was not satisfied.

The total share interests of the above directors, following these changes, are:

Edward Astle                                                           633,495
Mark Fairbairn                                                         311,072
Steve Holliday                                                         679,230
Steve Lucas                                                            547,571
Nick Winser                                                            453,848




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