In reply to D Berry:
> There were plenty about at Stanage on Sunday!
And
> Apart from the clouds of the little black swines around Apple Arete at Gardoms on Sunday!
Are you sure these weren't gnats or other sorts of flying insect? I've noticed that any type of small flying insect often gets referred to as a "midge", but I'm pretty confident there wouldn't be swarms of midges on the grit at this time of year.