Tom Anderson wrote

Also, veering OT, has anyone seen the Multimap redesign? Rather good,
i
think. They use a Mercator projection throughout, which means the A-Z
and
OS maps are reprojected, and thus have detectably deformed grid
lines,
which freaks me out. However, they have a layer which shows the
location
of cash machines, so overall, they win.

Err, the OS, National Grid etc. use a Mercator projection, Transverse
Mercator though (see the bottom of any OS Map).

--
Mike D