OS Explorer

OS Explorer, (1:25,000) Specifically designed for walkers and cyclists. They have orange covers, and contain 403 sheets covering the whole of Great Britain (the Isle of Man is excluded from this series). These are the most detailed leisure maps that Ordnance Survey publish and cover all types of footpaths and most details of the countryside for easy navigation. https://en.wikipedia.org/wiki/Ordnance_Survey#Leisure_maps