Lovely to see you all.  I had to sign off quite quickly after posting as the inside of my daughter's bedroom walls were all wet.  We had this problem last winter.  I just don't understand why as there is no pattern to it.  We can go weeks without anything, then suddenly it happens again.  It happened in my bedroom once last winter, but never again.

I've been so careful - kitchen and bathroom doors closed.  Windows open at every opportunity, heating on in little spurts to take the edge off the cold and damp.  The water was running down from the ceiling but the walls were also wet in other areas away from the ceiling.  I have a roofer who will be doing some maintenance on the roof so I've asked him to take a look.  It's so frustrating