I think they are midges.
Issue No. 1: Biting Midges
Annoying, avoid the same way you avoid mozzies, probably not dangerous. Don't scratch. (Haha, so hard). Being Australian, I always put tea tree oil on things that itch. You could try that. At least you feel as though you are dong something while you try not to scratch it.
Having tried all the local anti-itch gels and creams, I found that good ol' Germolene (I presume a British brand?) has been the most effective at relieving the itching.