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What is a grid reference anyway?
See also A guide to coordinate systems in Great Britain (or PDF).
Warning. As from 2009 January, this resource is obsolescent: enter valid parameters and you find that you instantly redirected.
However, since the new routine is still under development and has not yet found a permanent home, it is not yet worth taking action.
But watch this space!

Copyright © 2005 – 2009 Roger W Haworth
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public Licence as published by the Free Software Foundation; either version 2 of the License, or any later version.
This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public Licence for more details.