<pedantic> but that would actually be 4836,1258.</pedantic>Peyote said:Don't know about the 'photo locations Bonj, but national grid references can be given as either a grid square location e.g SU, followed by the eastings and northings within that square, e.g SU835257. Or they can be given as a complete numerical grid reference e.g. 483550E 125750N sometimes shortened to 483550,125750. Then you can get different accuracies e.g an eight figue grid ref (4835,1257) won't be as accurate as the twelve figure one above.
As usual Wikipedia should be able to explain it better than me!
Hope that helps.