"Ordnance Survey (OS) is a national mapping agency in the United Kingdom which covers the island of Great Britain. It is one of the world's largest producers of maps. Since 1 April 2015 it has operated as Ordnance Survey Ltd, a government-owned company, 100% in public ownership. The Ordnance Survey Board remains accountable to the Secretary of State for Business, Energy and Industrial Strategy. It is also a member of the Public Data Group.
Outdoor Leisure Maps [yellow cover]. 42 maps covering Britain's most popular holiday destinations like National Parks and selected Areas of Outstanding Natural Beauty. At a detailed 1: 25 000 scale they are invaluable to tourists and holiday makers as well as serious walkers and climbers, and show picnic areas, carparks, camping and caravan sites.