I have two large patches of damp appeared on my bedroom ceiling on opposite sides of the room. One is on the side of the end wall (end of terrace) and the other is on the side of the neighbour's house, where the two roofs adjoin. Both are high up at the edge of the ceiling. There is a loft room above but I can find no sign of the boiler leaking or any damp. I can't see any loose or missing tiles on the roof above the room, so I'm a bit at a loss. Should I call a plumber or should I call a roofer? Doe anyone have any recommendations? I'd be very grateful! Thanks, Lise