Twenty-five inch : Home page
We have coverage at this scale for certain counties pre-1940. Please ask for specific places and locations.
For anyone using large scale maps, we have republished the Ordnance Survey indexes to the sheet lines in Indexes to the 1/2500 and 6-inch scale maps : England and Wales, and Indexes to the 1/2500 and 6-inch scale maps : Scotland.
Some counties have been issued on CD, see Ordnance Survey maps on CD