I have a 1985 built mid terrace, we noticed a bulge in the plaster in the ceiling in the toilet, on inspection we found out there was a dampness(few drops) on the insulation above the same spot. The felt on the roof has a bulge and there is no immediate sign of dampness but it is bulginh inwards and i am dreading a tile is broken above it. i dont want to touch if coz if i dislodge the broken tile, it may get worse. I am tight on dosh right now, can anyone advise a quick fix or is it best to have it inspected by someone professional, please help!