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I've got pretty similar in our front room, I think it's coming in that way because of the prevailing wind and rain, and that the window isn't properly sealed around where it meets the brickwork.
Will get at it this weekend with a fresh tube of window sealant, but the general rule of thumb is that it takes a month to dry out for every inch thickness of wall.
So whatever you do, will take a while to bear fruit or be ready for paint again.
Not logged in as Mishk/me, but thank you.
Will check all those questions.