When camping goes bad

So that's set the idyllic scene, now for the reality...
Greg said that between 5 and 6 the flies start to come out, it gets a bit unpleasant so it's best to get out of there way for an hour. So 6.30 arrives and there is still only a few flies about. Then a few more arrive, then a few more etc etc x 100000. Now before I convey the true horror, 'Abou' as I believe they are called are around 15 to 20mm in length, look more like bees and when they bite, it feels like ... well it bloody hurts. To start with we probably looked like a bunch of Germans practicing whatever that slapping thing they do is (minus the leather shorts), then as they started to swarm it went from mildly amusing, through annoying to an bearable in the spacce of about 30 mins. We all sought refuge in the car to watch them in their 1000's crawl over the cars, the tents everywhere.
We waited and waited but they didn't go. It wasn't until the sun had completely gone down were they dosile enough to venture out of the car. We had a couple of gas laps that we left burning and each contained about 50 bodies of horse flies.