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1-3 Strand, London WC2N 5EH, United Kingdom

Registered in England and Wales No. 4031152

UK Shareholder enquiries: 0870 242 2379

US Shareholder enquiries: 1-800-466-7215

Any queries from holders of ordinary shares should be directed to Capita Registrars:

National Grid Share Register,

Capita Registrars,

Northern House,

Woodsome Park,

Fenay Bridge,

Huddersfield HD8 0LA

Telephone: 0870 242 2379 (from outside the UK +44 20 7098 1198)

Textphone: 18001 0870 242 2379

Fax: 0870 240 1286 (from outside the UK +44 1484 600 702)

Any queries from holders of American Depositary Shares should be directed to The Bank of New York:

The Bank of New York,

Shareholders Correspondence,

PO Box 11258,

Church Street Station,
New York NY 10286-1258

Telephone: 1-800-466-7215 (for international calls +1-212-815-3700)