Any leaks in the roof/loft allowing tracking down that wall?
Nope, bricks in loft are bone dry (no plumping in loft either)
Here is round the window.
Can be wet-ish to touch (paint gets on your fingers), currently dry but mark still there, having ran dehumidifier over night
@Grumpy_Git started
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Any leaks in the roof/loft allowing tracking down that wall?