Newquay / St Mawgan is also a posibility but they charge for handling and that goes up by quite a lot after office hours.
I have hear roumours of parts of the old St Eval airfield being used by some light a/c but do not have any contacts etc.
If it is true then you would need to be carefull of all the antennas there now.
The 'friendly farmer' breed in that part of the world seems to be thinly distributed.