Dividend Reinvestment

National Grid PLC
25 January 2008


National Grid plc ('NG')
25 January 2008

Notification of Directors' Interests- Dividend Reinvestment:

NG late yesterday received notification from the Trustee that, following the
operation of dividend reinvestment (the shares were purchased at 756.76p per
share on 23 January 2008):

In the Lattice Group All Employee Share Ownership Plan, Steve Lucas became
interested in an additional 14 ordinary shares;

In the National Grid Share Incentive Plan, Mark Fairbairn became interested in
an additional 19 ordinary shares. And in the National Grid Share Matching Plan,
Mark Fairbairn became interested in an additional 20 ordinary shares.

NG also received notification today from the Registrars that, following the
operation of the National Grid plc Dividend Reinvestment Plan, Sir John Parker
and Mark Fairbairn became interested in an additional 65 and 375 shares
respectively. The shares were purchased during 23 January 2008 at 786.64p per
share.

The Directors total interests after these changes are:

Director                                             Total interest after event
Mark Fairbairn                                       358,128
Steve Lucas                                          663,781
Sir John Parker                                      64,165


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Contact: D C Forward, Assistant Secretary
0207 004 3226


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