Happy Potter said:
They look a lot like the tiny vinegar flies too.
No different to those…I get vinegar flies too sometimes but these are a bit bigger and darker. Following BG’s ID suggestion I googled them and one of the descriptions was:
“Fungus gnats occasionally become a nuisance indoors when adults emerge in large numbers as mosquito-like insects from potted plants or flower boxes containing damp soil rich in humus. Adults are attracted to lights and are often first noticed at windows”
and this is what happens here. I often wondered if the fact that there are so many cattle and animals around (including my chooks) that might be the reason that we have so many, compared to others who live in more built-up areas.