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There’s no formal form or anything.
The agent has a legal obligation to inform buyers of anything that may affect their decision to buy.
If they’ve been shown a surveyor’s report saying a house has subsidence and nothing from an engineer to supersede this then it has to go in the marketing material.
Imagine being a potential buyer who drove 150 miles to a viewing then found out about such a survey.
Likewise this... Is this assuming you make some sort of formal declaration to the seller that you think the house is subsiding?