Ive been Goinging to Winteron Holiday park since i was 5 and have seen them adders quite a few times basking on the sand path leading down to the beach the valley is mostly ferns and a mossyish floor so when that gets wet and warms up it gets quite humid for the adders, so its perfect for them im off up thier again in 3 weeks fishing ill see if i can get some Photos of the valley even maybe an adder.