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Hah, this might help:
The place we were trying to buy had been entirely underpinned (semi, both sides, front back, party wall) except the rear reception room on the side that we were trying to buy.
So then you go back and you look at the surveyors report and he notes damp (visible) in the rear reception room and kitchen extension that was added, and also that the seller saw fit to allow draining from the roof of the rear kitchen extension to run off directly on to the floor rather than a drain, and you think 'what the fuck is going on here? is this subsidence related?' rather than 'oh, just some weirdness we'll have to fix'.
Done properly underpinning will fix the problem, but it won't stop other issues being mistakenly attributed to evidence of further subsidence.
Or something.
Is that because underpinning is to subsidence as damp proofing is to mould.?