Hi we own a house that was built in the 60's. The external walls are very cold to the touch (on the inside) and in our smallest bedroom, we seem to have a damp issue. It's an end wall, so no guttering etc. There is a water mark down the wall, all the way along the whole wall and we have had to wipe water droplets off the ceiling, and we have wiped down the wall several times.. There are little bits of black mould and the room is exceptionally cold, even though we have the heating on. Please can you advise on this, as we are at a standstill with what to do!"