Do you trust the surveyor?
Work colleague has just bought a house and had an asbestos argument thanks to a surveyor who marked an outbuilding as having asbestos as he couldn’t get access to check. Outbuilding was built after 1999 and construction details were available from the vendor if the surveyor had bothered to do their job.
Supposed to be a “full” survey and was practically a drive past viewing.
Get reliable builder to see if its real problem, are you in contact with the vendor enough to know if they’re desperate to hand over or can wait a few days? Estate agent can do one, they’re only facilitating an arrangement between you and the vendor.
Been a few years since I moved but the work colleague has had an much easier time by talking with the vendor, it’s been mortgage brokers and estate agents giving him grief.