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Failing to declare subsidence is likely to invalidate the insurance, there is bound to be a clause in there somewhere!
If I put in a structural report that a property is affected by subsidence, I also write that they should notify their insurers.
If a claim isn't made then maybe the insurers will never know about a report but that's insurance fraud....
I know less about the selling side of things but I know that once a claim has been made, it goes on a register which is checked during the searches.
How is this the case when your insurance provider won't see the survey?