GB Grid Reference to Lat/Long converter

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What is a grid reference anyway?
Code derived from convert.c found among Tony Fisher's files.
See also this interactive guide to the National Grid.
Copyright © 2005 - 2011 Roger W Haworth and several others
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.

Source code

 compared with geohack.php and includes as at 2011 Feb 23
coo2ll.php  functions used by coor_g.php and ioe_list.phpnew
cooerr.php  this file, included by coor_g.php on errorsnew
coor_g.php  OSGB36 → WGS84 converter
Roger Haworth's own work. All the following are by others  
geohack.php  map sources displaycan use geotemplate.txt for testing
geo_param.php  included by geohack.phpsame
helm_gb.php  required by transversemercator.phpnew
llfuncsm.php  required by coor_g.phpnew
mapsources.php  included by geohack.phpuses WGS2OSGB() and generates $osgb36_6fig
transversemercator.php  required by mapsources.phpadded WGS2OSGB