Director's Other Appointment

6 April 2016

National Grid plc ('National Grid')

Director's Other Appointment

In accordance with Listing Rule 9.6.14(2), National Grid notes that Paul Golby, a Non-executive Director, will be appointed as Chairman of Costain Group plc (Costain) with effect from 5 May 2016.

Costain is a supplier to National Grid in the UK and whilst the potential conflicts of interest are limited, arrangements will be put in place to ensure the situational conflict is appropriately managed and kept under continuous review. Mr Golby will not be involved in any Board decisions relating to Costain.

Contact:

Clive Burns, Head of Secretariat (+44 20 7004 3230)