The worst affected seems to be my room. It is the end of the turret with a massive vent (now gaffa-tape sealed) I will be sitting by the wall and actually feel the freezing cold air against my neck from the wall. The radiator seems to do nothing to help matters.
I have put tin foil behind the radiator (not sure if it has helped yet because the weather is warmer than what it was before I did it), but the radiator is on a different (and much less breezy) wall.
I took some steps to solve the draft in the flat (still a way to go mind), but I am at a loss on how to fix the back wall in a cheap way. I thought about tin foil but then I very quickly realised I would not be happy to have tin foil on my wall.
The landlord said he was sympathetic about cold but that they don't like vents being closed because of worry about damp/black stuff growing on walls. I did notice that some wallpaper came away from the wall when I closed the vent but at the same time it is in a stupid place if ever there was one.
Would stapling a decorative material help matters? Or maybe I could get away with hiding tin foil behind some decorative wall cloth so it does the job but looks half decent too?
Note about rental: I think I can get away with a bit of stapling/nailing but I cannot do anything to permanently alter the wall.