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Even with a hole in the wall above I'd not expect a localised amount of water like that (even on the assumption it's not a cavity wall).
Is the water apparent only when it's raining, and with a particular wind direction?
Or is the water apparent even when it hasn't been raining? Which would suggest a leaking radiator or water supply above?
Dugtheslug-
Is the water apparent only when it's raining, and with a particular wind direction?
That wall get some serious weather. I've only noticed it when its been bad enough to go through the plasterboard ceiling/wall, which has been when it has been torrential and windy
Or is the water apparent even when it hasn't been raining?
Not 100% on this one, and will now monitor it, but I believe it is when it has been raining only. In the past, there was a leak from above though and they have some pipes there (an old boiler, washing machine). Can't see their pipes from the bit I have cut out
bobble
2 flats above me, both with dry walls on that elevation with neither of them reporting issues