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user83155-
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.
seager
It looks like the damp is coming up, and down from the sill. Are there any down pipes in the near vicinity outside that are leaking/blocked drains. Or pipes under the floor leaking? What is the condition of the render outside, any cracks? How does it interface under the sill? Is that wall under the ground level?