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Wallpaper paste has anti fungal stuff init, by which I mean it's a know place for mould to thrive, instantly I wouldn't blame the bathroom (getting one side of a wall a bit damp shouldn't really seep through). You're on the upper floor? windows look good (uPVC?) pattern on the original paper and the bother of over painting suggests its much older than 20years or forma rental, plaster however looks much newer..
bluehuw
I'm assuming damp?
Been taking wallpaper off that I'm guessing has been here 20 years or so. It largely comes off in huge chunks as appears it's been painted over a handful of times (true all over, not just in this section)
There's this worrying section here though.
I'm guessing damp and I'm guessing it's because it's adjacent to the bathrooms.
Is there any way of diagnosing the underlying issue and if it's already been addressed?