As people say noisiest stuff will be PA etc, and I would assume it's hours of use you have to watch. Some 1:1 race tracks can't start until a certain time etc on certain days and have to finish at 6pm Sundays. As far as I remember though, noise is only an issue for residents, not ramblers/passers by?
However, and I know this won't be a popular view, but I know running an electric 10th buggy on tarmac can wake someone in a house @50 yards away with their windows shut, as I got shouted at for it once during a late night test!! So it's sensible for the council to ask if it's around hours of use. And bluntly guys, why would they know it's quiet if they don't know the hobby!?!?