phpcoord - osgb to lat/lng conversion, from http://www.jstott.me.uk/phpcoord/

website/plugin-rpc/tfl/phpcoord/readme-2.3.txt

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+--------------------------------------------------------------------------
+ PHPcoord
+ readme.txt
+ 
+ (c) 2005 Jonathan Stott
+ 
+ Created on 11-Aug-2005
+ 
+ 2.3 - 24 Aug 2006
+  - Changed OSRef->toSixFigureString() so that the eastings and northings
+    are rounded rather than floored.
+ 2.2 - 11 Feb 2006
+   - Used different algorithm for calculating distance between latitudes
+     and longitudes - fixes a number of problems with distance calculations
+ 2.1 - 22 Dec 2005
+  - Added getOSRefFromSixFigureReference function
+ 2.0 - 21 Dec 2005
+  - Completely different object design - conversion functions now through
+    objects rather than static functions
+  - Updated comments and documentation
+ 1.1 - 11 Sep 2005
+  - Added WGS84/OSGB36 conversions
+ 1.0 - 11 Aug 2005
+  - Initial version
+--------------------------------------------------------------------------
+
+PHPcoord is a PHP script that provides functions for handling various
+co-ordinate systems and converting between them. Currently, OSGB (Ordnance
+Survey of Great Britain) grid references, UTM (Universal Transverse
+Mercator) references and latitude/longitude are supported. A function is 
+also provided to find the surface distance between two points of latitude
+and longitude.
+
+When using the OSGB conversions, the majority of applications use the
+WGS84 datum rather than the OSGB36 datum. Conversions between the two
+data were added in v1.1 - the conversions should be accurate to within
+5m or so. If accuracy is not important (i.e. to within 200m or so),
+then it isn't necessary to perform the conversions.
+
+Examples of how to use the functions provided in phpcoord.php can be
+found in the test.php script.
+
+See http://www.jstott.me.uk/phpcoord/ for latest releases and information.
+
+
+DISCLAIMER
+
+Accuracy of the co-ordinate conversions contained within the PHPcoord
+package is not guaranteed. Use of the conversions is entirely at your
+own risk and I cannot be held responsible for any consequences of
+errors created by the conversions. I do not recommend using the package
+for mission-critical applications.
+
+
+LICENSING
+
+This software product is available under the GNU General Public License
+(GPL). Terms of the GPL can be read at http://www.jstott.me.uk/gpl/.
+Any commercial use requires the purchase of a license - contact me at
+phpcoord@jstott.me.uk for details.