Forgot to mention the damp patch is to the right of the window as you look at it from the outside, so not near the crack that comes down diagonally from the roof to the top of the window. It is on the other side, near the neighbour’s boiler vent.
Update: We have a damp investigation scheduled for early Feb (no earlier date was available...) but the damp patch is now drying up! I imagine this means it is to do with condensation or water penetration via the roof/external wall? Rather than leak?
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