It was busy the other day. Met a very nice Rockwell Commander coming the other way up the Derwent, all lights on as I had, sensible chap and then a couple of PA28s diving down over Hathersage to begin their run.
I've never understood why people run 'up' the dams rather than 'down' them. It's the wrong aspect for a reasonable approximation of the actual training missions and there's a large set of valley walls at the end that I suspect would outclimb any asthmatic GA a/c or at least make for some interesting and reflectful moments.