Think you off the mark beefer.atc will ask the aircraft their height and the pilot will advise any change.
I suppose yes...the aircraft doesn't have to tell atc if he changes his height outside the airspace but would be prudent if other aircraft around?
If near the airport they have to keep atc informed?
Airport closed overnight so no need( /never has been)for 24/7 monitoring?
Finally. If SSR is available from claxby. It's a bit disconcerting that peel had the option to pay for that but chose not to? A real reduction in professional atc service?