I quite often don't use the radio. Just having it doesn't make it compulsory. However, if you're sightseeing in Shawbury's Zone, it's fine to tell them just that. You can call it General Handling if you like - after all, that's what instructors from Sleap and Welshpool will be telling them. They usually give you a squawk and leave you alone unless there's any traffic close to you. But they're closed at weekends anyway.
Genghis is on holiday.