I've received a copy of a map of a site plot for an old property that
we've almost decided to buy (negotiations ongoing). The map is
originally from the local council and shows in detail the outline of the
plot, scale 1:1250. It's been reduced and no "rulers" are included on my
copy, just a grid that I would guess is 100m. On the photocopy it says
"OS Map: Reproduced by Permission of Ordnance Survey".

The vendor and agent haven't measured up the plot themselves ("we
*believe* it to be blah blah") and the agent's own copy of the map
doesn't show anything that he didn't send me. So does anyone know what
the grid size of a 1:1250 Ordnance Survey map might be? I guess our
future solicitor and surveyor will know very well but if anyone knows
before I kick their taxameters into action then I'd be grateful.