Self-confessed map addict Mike Parker explores modern cartography.

Thanks to Ordnance Survey, the landscape of the British Isles is probably the most comprehensively mapped of any in the world.

But pressure is growing for OS to waive their copyright and make their cartographic data free to use for all-comers.

Mike Parker asks whether the UK's mapping agency can maintain its hold on the national topography - and its reputation?

Producer: Jeremy Grange

First broadcast on BBC Radio 4 in March 2010. Show less