I'd say if it was badgers @Sting would probably hear them: they can make a hell of a racket. Interesting what you say about badger/fox interaction. We used to have a sizeable badger population near us but I haven't seen any for a long while. I had assumed that the foxes - which we see very regularly - had driven them away but that doesn't tally with what you say here. Oh, and PS: setts.