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It's about 7ft up and the wall on the left of the image is an exterior wall. The wall on the right is interior (newish extension on the other side).

Hi, I moved into a new house in September and shortly after I noticed a strange stain on the dining room wall about 7ft up (see attached). We were painting that room anyway so went over it but it has now come back gradually and is quite prominent. Any idea what this might be and what work may...