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Could it be condensation?! It’s a high ceiling and quite open to other rooms/rest of house but there’s no real extraction.
In the room itself or coming up through the floor? That area does look under ventilated; caping the chimney off will have closed off an escape route (is it a ventilated cap or not?) and the air bricks are a good distance away for the sub floor, especially if that is a bit of solid flooring at the front.
Howard-
Cap is ventilated but the fireplace is covered over/sealed behind the sink (hence wanting to cap it)!
I thought maybe it was an accumulation of small damp sources finding the lowest point but what’s a bit weird is that some of the fucked plaster is on a single skin brick wall which is fine on the other side.
Dramatic_Hammer
It was really bad when we moved in (2017) but no visible mould inside cupboards.
Since then I’ve fixed the tap and sink, repaired the gutters and had the chimney stack capped and re-rendered. We’ve also had the boiler/CH system done and no leaks there.
Things aren’t going mouldy, just getting damp and clumping/etc.
I suspect I will also have to pull up the floor at some point but everywhere else in the house I’ve done that, it’s just very dry dirt.
Could it be condensation?! It’s a high ceiling and quite open to other rooms/rest of house but there’s no real extraction.