Hi folks,
My thread just vanished, so in case it happens again, here's my two-part conclusion, based on years of interaction with bugs on the Canadian shield--a more serious problem than midges, from my more limited experience in the Scottish Highlands:
1) DEET works well, BUT is carcinogenic and destroys nylon, so keep it away from tents, clothing, etc. Maybe use it sparingly on cotton clothing. Handy to keep around as it's highly flammable & will light a fire in the rain if you have a reliable source of flame.
2) Best non-DEET item I've ever used is called "Skeet-Addle". This is as effective a repellent as DEET, smells nice, & is non-toxic, though it doesn't last last quite as long between applications as does DEET. You can get it from a home business in Whitehorse, Yukon. Go to one of the best URLs in the world: www,aromaborealis.com Bev Smith sells cosmetics based on natural oils and recipes from indigenous peoples. My daughter introduced me to Aroma Borealis when she was working in Yukon. I find the spray version off Skeet-Addle works best, though the cream version is nicer on the skin, if one is a member of the Celtic diaspora & susceptible to dry skin.
Pls greet bev for me when you're in touch,
Good luck,
John Saxby
PS: Of course, you can save yourself a lot of trouble by just ignoring the wretched things--but given the choice, I'd go for Skeet-Addle.