First time ive heard of this, Ive spent many a day when I was younger down Castle Eden Dene, bird nesting , conkering, making swings and just mooching about me and my mates used to know the dene like the back of our hands, we used to walk the mile pipe and we used to climb on to the top of the castle and catch the pigeons that were up there, weve even swam down Jaques Ladder, when I got my first ferret about 40 year ago I stareted to go ferretting down the dene, Ive been lamping around castle eden dene and for the size of the dene there was never many rabbits or hares in the fields around it