No smokers in this house I'm afraid. I had a full building survey done in Aug 2014, which didn't highlight any areas of damp. The brown water is from staining either from the 140yr old bricks or rusted screws. The water dripped through the hole for 3mths until VM sealed it.
Had a damp contactor look at it today who believes the plaster should have been stripped last year and re-done, so was not given the chance to dry out, hence that cracking now.
Looking like VM are at fault, as they should have done more than simple 'repaint' the wall.
This is what is looks like under the box.
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