I keep getting damp patches appearing in the bathroom - normally a couple of days after it rains. They are either 'blobs' or drips which run down the paintwork.
I am not sure whether the problem is due to guttering, the roof or anything else!
Also not sure whether I need to call a roofer, plumber, etc.
Probably leaking flashing around a chimney or a displaced tile, have you been in the loft, if the water runs diagonally however and you notice cracks appeating it's subsidence ,
Check chimney flashing first .. then ridges .. then for missing slates/tiles. Local builder can do that.
If you call a roofing company, you 'may' get a list.