Thinking about it more I think a ventilation hole in the wall between the bedroom and staircase for better circulation isn't a bad idea even if it's just to reduce the stagnant air in there that produces the small spots of mould in the corners in winter.
I have a spare extractor fan, make the perforation and try. Brick work gets messy though and double brick walls are always hard to work with. Can always cement it back up.
I have a spare extractor fan, make the perforation and try. Brick work gets messy though and double brick walls are always hard to work with. Can always cement it back up.