Taken from Trailwise
"Currently very difficult and controversial lane. Locals are very unfriendly. Legal to drive (at present, but check). GLASS Derbyshire rep recommendation is downhill only and no night driving. Driving this lane uphill might contravene the GLASS drivers code (need for winching, recovery, damage to surface etc.)
23/02/2013, by Chris Mitchell
This lane is almost too dangerous to drive now in my opinion. Beware of the possibilty of vehicle body damage. Did downhill for the first time and so glad we didn't attempt uphill! Probably will become the next lane on the closure list but should really be VR downhill only. Also a nasty wash-out where it joins the stepped lane. "
OK it was a challange but not anywhere near that bad in dry conditions. I would say that yes it maybe inpassible up hill in the wet but the day we did it I do not think that we did anymore damage than an inexperienced driver sliding down it on his brakes in wet weather.