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All rads in the wrong place in my place. I've found adding a small oil filled radiator under the window does actually help. It's tiny, cheap from Argos, doesn't cost that much to run. Tuck the curtains in as well (not hanging in front of the windowboard). Also it'll be humid if there are children in there so the dehumidifier will help. If it's all a bit noisy, even running it during the day up until bedtime will help.
My understanding is that rads should be under Windows? (Despite my initial assumption that the heat would just piss out the window)