After getting in from work on Friday, we decided to go for a spontaneous evening drive and sleep out in Herman. With no fixed destination in mind, we just drove vaguely southwards until night fell and it got so foggy, we could barely see. Then we pulled into a handy layby and crawled in the back of the van with a bottle of whiskey and a few beers, to keep out the chill. In the morning, we awoke to find ourselves in the carpark for Blue John Cavern in Derbyshire. So, after a hearty breakfast we went to visit the caverns and had a nice guided tour by ourselves in our party of two, because no-one else had turned up yet.