Used to be a law that said you could follow a hunted animal wherever it took you and deal with it within reason .
Used same law years ago to get us out a sticky situation when lurchers and terrier running free ran a fox onto National trust ground and we found the lurchers marking an earth .Luckily terrier was collared up with the old Deben and we made a start only to get caught by some busy body who phoned the law saying it was a badger sette .We broke through to a fox just as we got swarmed on by coppers, chopper in the valley ,the lot .Arrested ,de arrested and on our way all on the sa