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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.
Using the word "subsiding/subsidence" will mean that you won't be able to get insurance until you have had a structural engineer's report, it will be interesting to hear what the surveyor says after your chat.
For the record there is no such thing as a
A RICS survey is a general building survey which isn't carried out by a structural engineer.