A guy at work did the 100 miler and came like 15th or something. Absolute beast. I've only just got talking to him. He said it was pretty sketchy in parts: he passed some huge drops in clear daylight, but said he'd've been pretty terrified to have traversed those parts a little later in the pack when the mist set in. F*** THAT!
At least the 50k sounds a little more...manageable!