If you've been training with NATS then I would of thought you'd have some idea of NATS\ non NATS airfields?? The best way to find non NATS airfields is to take away the 16 or so airports NATS has contracts at, then every other airfield is a non NATS airfield. A good few in Scotland - Highlands and Islands, Newcastle, Liverpool, Exeter, Newquay, Teeside, East Mids, Coventry, Cambridge, Biggin Hill and many more. Good luck