I'm not sure you'll get maps to the scale you want. The best scale available on OS maps is 1:25000, which is more than good enough for normal usage. There will only be a map of the area if someone has "mapped" it. If the footpaths don't exist as footpaths then they wont be marked on a map. Also remember that they don't update OS maps constantly and farmers have a habit of moving fences etc. I went on a hike recently and the field bore no resemblance to the map as the farmer had changed all the fences since the map had been drawn.