If you need a high-level view of the road network in Great Britain, OS Open Roads os for you – and its completely free.
If you need a high-level view of watercourses in Great Britain, OS Open Rivers is for you – and it's completely free.
1:100 000 scale vector dataset of political boundaries, updated each May and October, showing council wards, constituencies for MPs, MEPs and more.
If you rely on correct names with accurate locations for use in mobile, web and internal software systems, choose OS Open Names.
Sharing a common source with premium OS Terrain 5 data, this simplified digital terrain model is ideal for visualising and analysing large landscapes.