Good luck with the Save Plymouth campaign.
I do have one thought, though. If it is to become a GA centre, the airport does need to be rather more customer-focussed and less bureaucratic than it has been. I have always enjoyed visiting the area, but the airport is not exactly welcoming.
The restaurant is more like a station buffet and the need to go through a full-blooded security check on departure was a real irritant.
That said, there would be a lot of goodwill towards the airport if it became a real GA-friendly site