UnderOpenSky
baseline neural therapy
If the guttering and roof tiles are ok it’s probably a condensation issue.
Have you insulated the loft? If so it’s possible that the Rockwool or whatever was pushed too far into the eaves and is preventing air from circulating (a building of that age was designed to have a cold loft; we insulate them now but that means they are much colder than was intended and means they are prone to condensation unless properly vented). So, check the airflow from the eaves is not blocked by insulation in the first instance. If the insulation is properly installed but airflow is restricted install some soffit vents (cheap, and available from builders merchants and DIY sheds although you’ll need a head for heights).
Thanks. I've not actually checked the tiles, but couldn't see anything from the ground. I'll out and have another look.
We've done nothing to the loft. When we got the place three years ago I went up and found it was insulated with those tiny ball things, which put me of venturing up there again. It's a bit of an ambition for some time in the future to use the space better, but it's always seemed a long way away. So I guess I need to go up again and have a look.