Ooh. I've read that the Scafell Pike is a difficult walk to begin with, so doing it in freezing fog must have been a real challenge.

I was curious about the difference between freezing fog and frost, so I went to Wikipedia (http://en.wikipedia.org/wiki/Freezing_fog). It makes sense that meteorologists would categorize it like this, but I'd never thought about all the different kinds/definitions of fog before! (Also, LOL, random Star Trek photo.) I don't exactly trust Wikipedia, though, and its various articles don't answer my question, so I'm still trying to find an authoritative answer.