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New screws seems to have sorted it!
It was quite satisfying, impact-driving them in, until my back had enough.
I think most of the problem was caused by the small screws someone had used to resecure the boards after some work had been done. Swapping those fixed the noise, but for good measure I went round and put a screw in at every nail point.
Yep, that's the sort of thing you need.
Nailed on chipboard was all the thing in the 60s, before they realised it loosened around nails, rather than tightened like wood does.