I've got an 1890s house in London. We started getting some penetrative damp through some of the upstairs walls so I've had a look in the attic to check if there's anything going on up there.
It looks like all the rafters have got white mold on them, though the internet's say it could be efflorescence. I'm guessing that me replacing the insulation in the ceiling joists a few years ago has contributed to this.
Luckily I have one window in the attic, but it's a small window and a large attic, and it's currently winter and quite rainy.
All my Google searches are turning up damp companies who surprisingly don't respond to phone calls or emails so I ask the more trusted stackexchange: what should I do, if anything, about the attic?