Module:Ordnance Survey coordinates/doc

Usage
Converts a OS grid ref to a lat/long hyperlink to geohack.


 * ← Two-letter code interpreted as OS grid ref in Great Britain
 * ← One-letter code interpreted as Irish OS grid ref
 * ← Two digit strings interpreted as easting/northing in meters in Great Britain
 * ← String starting with i is easting/northing in meters in Ireland
 * ← Second argument is used as link text
 * ← extra underscored parameters passed to geohack

Also converts from lat/long back to OS grid ref:
 * → SK1350073300