Got an Harvey one for the Helvellyn summit at that scale ...
Harvey also do summit enlargements at 1:15,000 scale (eg Scafell and Pillar on the reverse of the BMC Lake District map).
They slao produce a detailed summit map of Ben Nevis at 1:12,500 scale
AFAIK, the OS 1:10,000 maps are the modern equivalent of the old 'six inch' series. Those were used extensively used by local authorities for things like individual planning consents, local town planning, and environmental work and were also used by various land and estate agencies.
I'm not sure whether or not you can still get 1:10,000 as printed maps because OS now sells them in electronic form as raster image multi-layer files on DVD.