In reply to Paul Clarke:
I think it depends on your sensitivity and what you do for counter-measures. I'm certainly midge sensitive but maybe not as much as some and that might be partly as I cover up and uses anti-midge juice when they are a pain. When I went recently it was OK for me to solo covered up... didnt even need the juice. However, on a similar day on Stanage I'd be running away screaming (or more pertinently when we went to Guiseciffe about a week later, on a partly cloudy day, the buggers made us give up sense checking for a while)
If I had to list in order the midge affected nature of grit crags on still muggy days it would be bottom quartile. If nothing else what do the midges there live on??