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(edit - single glazed!) aluminium windows.
could be an up hill struggle, trickle vents work well for air flow in very well insulated buildings (I've also known them as an excellent breeding ground for 50+ harlequin ladybirds or spiders). Fixed interior second glazing maybe an effective option to weigh up with all the cruxes
bluehuw-
Thank you - having kept an eye on it this weekend I think you're right, the primary problem isn't with ventilation but with temperature differential. Even with the top window open the condensation appears and doesn't disappear until the sun shines on the window - whether the room is occupied or not, and across both elevations of the house.
We have radiators under the windows which don't currently work - I'm going to try to get those working first to see if that makes a difference.
@rhowe great experiment - I've tried it and it made zero difference. I'm going to try with another shower head, see if that's where the problem lies.
This thread is amazing. It's so great that people who have been in this position are sharing their experience with us noobs. I've been living in flats for the last 30 years of my life and I'm amazed at the amount of basics I don't know.
ReekBlefs
This may not be a DIY question but we've just moved into a gaff with (edit - single glazed!) aluminium windows. They have no trickle vents and the condensation in the morning if we've had the windows closed is crazy - it's like it's raining on the inside. There are some vents in some rooms, but they don't seem to make much difference.
I only noticed this this morning as it's started to get colder, and obviously shorter term we'll try to keep windows open as much as possible, but longer term is there anything I can do here? Is it possible to retrofit trickle vents onto aluminum windows?