For anyone wanting to use this for future reference, Elpha Green farm no longer owns the land the cave is on, but as long as you dont use the entrances in the quarry face (jump the small stone wall and use the entrance in the stream bank) theyre ok with people having a poke about, tbh though the main bedding squeeze is now so tight that not even the skinniest member of our party could get through and we had no tools with us, clay floor has a distinct rise in it now which would probably only take half an hour to clear with a trenching tool