In reply to Trangia: By late September they are dying back a bit here in Lochaber, In October they are often beginning to freeze/drown.
And Smidge is the best midge repellant ever. Except no alternatives. I watched the blighters crawling all over my hands in Glen Nevis last year after a good application of the stuff... and then fly away without biting! They still land and crawl but they don't like the taste. Much more effective than an oily barrier like Skin So Soft and less corrosive and more effective than Deet. Much more effective than any of the natural/herbal repellants I've tried. Goes on like sun tan lotion. Available in Tescos.
http://www.midgeforecast.co.uk