roar00: NATS 220 is the July/August start - 20th July for Aero and 5th August for Area. As far as I can tell, NATS 221 is the October-ish start.
pchs: I'm starting on the 20th July (see above) and my referee hasn't been contacted yet (I said it was fine to contact him whatever time NATS wanted to). Application form - it's for Stage 3; Stage 2 is quite impersonal (computer tests), but you'll get asked (and you can tell the interviewers) about things on the application form when you get to the interview at Stage 3.