Publication of Prospectus

National Grid PLC
06 March 2006


Publication of Supplementary Prospectus


The following supplementary prospectus has been approved by the UK Listing
Authority and is available for viewing:


Supplementary Prospectus for the National Grid plc / National Grid Electricity
Transmission plc Euro 6,000,000,000 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/3833z_-2006-3-6.pdf



For further information, please contact

Andrew Kluth
Assistant Treasurer

National Grid plc
1-3 Strand
London WC2N 5EH

Tel:     [phone]
Fax:     [phone]


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.


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            The company news service from the London Stock Exchange