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@NotThamesWater
^ this. And the guttering is look incomplete.
The water look like it's draining over the window ledge and onto the wall behind the render, which is then preventing it from drying out.
The damage may just be to the render, which is a quick fix. Just remove it.
Although it may well be covering up something more serious. Which a surveyor probably won't be able to tell you, without removing the render.