Top challenge!
Having been brought up on the edge of the Lake District our take on this was to roll from the summit of Corney Fell to Duddon Bridge - essentially a 4 mile, single track road initially over open moorland then through woods - at night, without lights.

It's a winding 4 mile descent and, through the wooded section, you'd be hitting 80mph.

I drove over this road again a year or so and wondered how the bloody hell I'm still alive to tell the tale.
( The Disappointed Caravanner of the year, Wed 14 Jan 2009, 21:26, Reply)