Supplementary Prospectus

National Grid PLC 19 May 2006 Publication of Supplementary Prospectus The following supplementary prospectus has been approved by the UK Listing Authority and is available for viewing: Supplementary Prospectus dated 19 May 2006 National Grid plc and National Grid Electricity Transmission plc Euro 12,000,000,000 Euro Medium Term Note Programme To view the full document, please paste the following URL into the address bar of your browser. http://www.rns-pdf.londonstockexchange.com/rns/3026d_-2006-5-19.pdf For further information, please contact Andrew Kluth Assistant Treasurer National Grid plc 1-3 Strand London WC2N 5EH Tel: +44 20 7004 3000 Fax: +44 20 7004 3342 DISCLAIMER - INTENDED ADDRESSEES Please note that the information contained in the Supplementary Prospectus may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Prospectus for the National Grid plc / National Grid Electricity Transmission plc Euro 6,000,000,000 Euro Medium Term Note Programme dated 18 August 2005) only and is not intended for use and should not be relied upon by any person outside these countries. Prior to relying on the information contained in the Supplementary Prospectus you must ascertain from the Prospectus whether or not you are part of the intended addressees of the information contained therein. Your right to access this service is conditional upon complying with the above requirement. This information is provided by RNS The company news service from the London Stock Exchange
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