Hello! I have a mystery damp patch on an interior wall, and only on one side of that wall. It's located above a radiator. It's not near an exterior wall, it's not near the roof, nor near a window. No major pipework in evidence other than pipes for the radiator, which are well below the damp patch. I don't know who I would need to ask to take a radiator off the wall and inspect where the problem may be coming from.
