National Grid plc ('NG')

18th January 2012

Notification of Directors' Interests

- Dividend Reinvestment

NG today received notification from the Trustee that Steve Holliday became interested in a total of 825 shares held under the National Grid Share Matching Scheme, allotted today under the terms of the National Grid plc Scrip Dividend Scheme (the 'Scheme') at the Scrip Dividend Reference Price of 613.80p per share.

NG received notification yesterday from the investment manager of Sir Peter Gershon's personal pension scheme of having purchased, on 16 January, a further 99 shares at 628.398p per share. And his ISA manager has notified the purchase, today, of 68 shares at 627.423p and a further 6 shares at 626.923p.

The Directors total interests after these changes are:

Director

Total interest after event

Steve Holliday

2,187,261

Sir Peter Gershon

8,055

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Contact: D C Forward, Assistant Secretary

0207 004 3226

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