Hector, no such mites here, just as well
4 weeks ago I was bitten by tiny flies. The bite did not hurt at all, just a tiny speck of blood on my legs. I ignored it and in the end had about 20 bites on both lower legs. Later my legs swelled dramatically, turned very hot and red. I nearly went to A and E with it, but after a few days antihistamin cream took its effect. Now all fine, although still visible.
We looked the beasty up and it was a sandfly that did it. Apparently they have spread from the South and East Anglia and are certainly now in the Southern East Midlands as well. Horrible things.