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@Bad_Science
Looks as if it either a blocked gutter/downpipe or a dodgy seam where the old chimney stack borders the flat roof. One wall of the upstairs flat is obviously very damp, above where the leak into mine was. It's the wall with a disused chimney in it, so it looks as if water is coming down into mine where the chimney breast was removed years ago.
No dripping today, so it's rainwater rather than plumbing, I think.