Had problems with them for years. Always go for the white on the windows and in everything in the house, in the curtains, bedding, all over. Whenever we have a warm spell they invade big time.
They are Harequin ladybirds an invasive species from Asia and actually carry a fungal and STD infection but will not harm humans and they do not bite.
If an windows open I cannot begin to tell you the invasion I have in the house, they eat our native ladybirds and smell something awful if you pick them up to get rid of. Can't get rid of the smell on your hands.
It was pure freaky here on Tuesday and a neighbour came round and said wouldn't have believed it if not seen with his own eyes. All over the outside window panes, crawling up the walls, flying at me, I love wildlife but hate these.