I had a jolly evening bimble in Bruntscar Cave, above Chapel-le-dale, many years ago (mid-80s). We were welcomed by a fine old fellow at the farm who asked us to donate to the repair of St Leonard's church roof. He showed us where we could park and said we could change in the barn - the cave entrance was through the barn. Great evening's caving, unique context and off the beaten track - but this was long ago, I don't know what the access situation is now. Perhaps worth a trip to find out?