Knott summit.
The mist was so bad, without any landmarks to guide me I went into auto pilot and thus promptly made a mistake - I left the summit following the path that I'd assumed I should be on, but I did get my bearings completely wrong, and for half a mile I was headed for Mosedale. Doh ! when I realised, it was back to this summit to pick up the path that I really needed for my trip over to Great Calva.
Just shows you how easy it is for a fell walker to loose his bearings when visibility is poor. Having said that, there are a few of you out there that will remind me that I can also get lost in perfect, clear, sunny conditions - I have had my moments, I have to admit.