In reply to sealong2:
It depends on whether the ground frosts have started - if they have, the midges will be dying out fast; if they haven't they could still be bad.
Hay is spot on re repellents. I think that, barring exceptional circumstances like being stuck in the middle of a bog working all day, it's best just to put up with them - try to stay in the breeze as much as possible, maybe use a midge net if stuck amongst clouds of them.