Director/PDMR Shareholding

National Grid PLC
16 June 2006


16 June 2006
National Grid plc (National Grid )

_____________________________________________________________

Notification of Directors' Interests, pursuant to Section 324(2) of the
Companies Act 1985
____________________________________________________________


Deferred Share Plan


On 15 June 2006, the following directors were granted an award of Ordinary
shares in National Grid (the 'Shares') under the National Grid Deferred Share
Plan, calculated by reference to a share price of 583.96p. The awards will vest
on the third anniversary of the date of grant (June 2009). The shares will be
transferred to participants net of deductions as soon as practicable thereafter.

            Director                                   Number of Shares

          Mr E M Astle                                                    28,769
          Mr S J Holliday                                                 36,389
          Mr S C B Lucas                                                  34,882
          Mr M Jesanis                              31,015         (6,203 ADS's)
          Dr R J Urwin                                                    62,881
          Mr N P Winser                                                   31,316


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

            Director                                            Number of Shares

          Mr E M Astle                                                   619,654
          Mr S J Holliday                                                523,986
          Mr S C B Lucas                                                 561,846
          Mr M Jesanis                                                   428,232
          Dr R J Urwin                                                 1,430,928
          Mr N P Winser                                                  419,742

The directors holdings in B Shares in National Grid remain unchanged.


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Interests Notified by the Trustee of the Lattice Group Employee Share Ownership
Trust (Notification of Directors' Technical Interests,)

On 15 June 2006, National Grid also received a notification from Lattice Group
Trustees Limited, as Trustee of the Lattice Group Employee Share Ownership Trust
(the 'Trust'), operated in conjunction with the Lattice Group Short Term
Incentive Scheme (the 'Scheme'). Following the transfer of 23,700 National Grid
shares to participants on 15 June 2006,Steve Lucas together with other employees
formerly with Lattice Group, have a technical interest in the new balance of
37,315 shares held in Trust.

(Note: For Companies Act purposes, Steve Lucas is deemed to have a technical
interest in all the shares held in this Trust, together with all participating
employees. The interest ceases when shares are transferred to participants under
the rules of the Scheme.)


Contact: D C Forward, Assistant Secretary (020 7004 3226)




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