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Sounds like it is - I haven’t tracked through the pipe to the exterior though.
(The worst it has been is when we’ve used the oven though, which doesn’t have an extractor - which makes me think it is probably condensation related).
My thinking is it is prob condensation but the lack of insulation on 1920s brickwork makes it worse - the rear wall feels freezing.
The main place we’ve seen it is on that rear wall, which is where the fridge used to be (and is now ours has arrived too) - i wonder if the warmth of a fridge keeps the wall warm enough to stop the condensation, but if so that doesn’t seem ideal and we’d maybe be better off trying to insulate better.
Interesting, ta - yep, none of the windows have vents… they’re all lovely wood frame ones so really hope we don’t have to change them out! What do you mean about drainpipes - are you thinking of water ingress from leaking ones? I didn’t think this was rain related given its not been too wet, but it could be.
The most visible place seems to be the rear wall, in red here, and in the (now closed off) fireplace: