If they want it to "help grow rallying" it should feature a truly representative stage, it'd have to be somewhere like Sutton Park, Wollaton Park, Bute Park or Bellahouston Park, somewhere as near as possible to a large popular centre, where people can easily come and have a look. The likes of Castle Combe and Chatsworth are just too far out. It may be a couple of years too late for the former though, in terms of getting the local authorities onboard and keeping the likes of Just Stop Oil away... Sadly, I think the time to do this was 10 years ago.