Quote:
What I'd like to do is find a source of elevation data for the UK at around 10m resolution so I could upload a local height map into the autopilot before a flight, allowing it to avoid the ground without some form of active sensing, but all the high res data I can find is much too pricey.

Have you looked at Memory Map? (www.memory-map.co.uk) The elevation data is a separate .qed file. I'm not sure of the resolution or format but it might be useable. They have sample downloads which include a qed fle.

Gareth