Probably there are very few there because people keep ferreting them slap bang in the middle of the breeding season.
If a farmer sees one or two rabbits, then they say there are overun with rabbits.
Same as when they are overun with moles, they say they only have a few on.
If the ferreting was left until September (end of preferably), there would be something to go at come hunting season.
on every bit of permission Ive got I always get the same answer................theres hundreds of them! lol