Please note that access to Old Ash Mine in Northern Dale is to be restricted to between June and September from now on, at the request of the landowner. I don't have any further info at the present time, but the access arrangements remain the same:
https://peakdistrictcaving.info/home/the-caves/derwent-south/old-ash-mine
https://peakdistrictcaving.info/home/the-caves/derwent-south/old-ash-mine