1) Which counties would be typical for fox-hunting in that age? Ones with non-standard local accents would be a plus (so that foreign characters might have trouble communicating), as well as dramatic/gothic scenery.
2) What type of people were invited to Victorian fox hunts? Peers of course, but also gentry? And other people (the local vicar, for example)?
3) How dense was this population? More to the point, supposing you encounter someone on a hunting horse in the middle of the night, would there be just one house close enough for him to come from without overnighting / tiring his horse, or would there be a choice of a few (or many)?
I've come across completely different information for all three of those, plus any search for fox hunting means digging through a ton of links about the banning laws.