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Sorry for late reply! Those patches are sitting above the ground floor bay window. There are no wet patches on the 1st floor (bedroom) bay just a horrible wet plaster smell, I suspect from the wall below. Moisture reading are below 10% in the 1st floor bay. When I take moisture readings where...

Thanks for your replies! I’ll get someone to check that lead detail, although 3 roofers haven’t picked up on it previously. A builder did suggest having a cavity tray fitted, but it was quite expensive and I wasn’t sure it would solve our problem.

It’s lead. I have queried this before as it doesn’t seem to be fitted into the wall like our next door neighbours (I’m no expert). But we’ve got no sign of water ingress at all from upstairs.

We’ve got a total mystery of where water is coming in and causing damp above our bay window. It’s a 1930’s cavity wall build with bay on ground floor and 1st floor. We’ve changed the windows, had our roof inspected 3 times, render checked and no one able to see where it’s coming from. We know...