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Agreed, I need to cut a hole this evening and see what's there. It was done 25 years ago, so I'm presuming it's minor. If we had the space I'd just stick a blanket across the inside and sacrifice the couple of inches, reality is it's tight already.
We stuck blackouts on the windows last year, made a difference. This is stage 2!
SimonM
Have you had a look behind the knee wall to see what has been put there so far?
You'll likely be limited what you can do, given the rafter height and need for ventilation.
Unless you take out the existing plasterboard and stud the celing out a bit further, sacrificing headroom.
A quick (and minor) win would be an awning for the window and a reflective blind.