Now I've got the ferrets in a court with just a sleeping box I thought I'd try them on a piece of vet bed I've got knocking about rather than messing with shavings and straw but within 5 minutes the hob had one of his nails caught in the fleece and was rolling around screaming his head off. I thought they were fighting at first.
It might have just been a one off but they're back on straw now, just thought I'd warn anyone thinking of using that type of stuff to keep an eye on them.