SB
Understood.
Between Padstow and Wadebridge is Hustyns Hotel, it used to be owned by a guy who had his own helicopter, so there might be a decent site attached, I do not know for sure.
Try the website at
http://www.hustyns.com/ for their contact details.
Perhaps you could also call the Cornwall Air Ambulance folks (operated by Bond Air Services) based at RAF St Mawgan, they will be best informed on the local comings and goings, also RAF Operations there will have some info. Air Ambulance site
http://www.helimed181.co.uk/
Enjoy your meal at 15s, book early though.
For Fission, you mentioned Truro, I pass it regularly and it is still active albeit with some planning issues in the past, NIMBYists I believe. A quick googling produced this if you need more info:
Clouds Aviation
Truro Airfield, Tregavethan, Truro, Cornwall, TR4 9EX
Tel: +44 (0)7899955121
Base Airfield: Peranporth
pp