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Thanks so much! It's exactly as you describe it, cold but not wet. From googling it does sound sound like salts as we have a smaller patch on an interior wall and it our bedroom. Both rooms are the only ones to very old plaster. I'm assuming replastering solve this then?

Outside

Can only add one pic per post for some reason.

Thanks John! Ok so here's some pictures. I can't quite get floor to ceiling as its too high! He mark starts about 1.5 metres from the floor. From the outside the mark is in line with the guttering bracket but on that wall inside the neighbours porch. As you can see the houses are old 1893 I...

Can anyone shed any light on this water mark? It appears when we have had heavy rain or its cold out, it is always the same shape never grows etc. It will disappear when it warms up or the heating is on or a fires been lit. It is an exterior wall and the other side is the neighbours porch. We've...