I've been given a set of UK Ordnance Survey geocodes, but I think they're all off by about 500 metres.
Here is an example - please could someone confirm to me that the codes are wrong, not my calculations?
The OS geocode that I've been given is
SO7567, for a place called Abberley, in Worcestershire.
This conversion site suggests my calculations are correct, and it is indeed the original coders (who looked at Abberley, and decided that its Ordnance Survey code was
SO7567) who were out of whack.
Could anyone suggest why they might all be out by exactly this amount - could it be a projection issue? I'm not an geographer, and the person who gave them to me swears they should be right!
Thank you for nay help.