This is why conveyancers must carry out a coal search. Searches are required by your mortgage lender and even if you are a cash buyer it is common sense to put them in place.
The point of the conveyancer carrying out searches and enquiries is to ensure the property you are purchasing is good security. In other words suitable for resale or remortgage in the future.
A survey is the buyer's responsibility. Not the conveyancers.
A lender valuation is not a survey and a buyer cannot rely on this. Get a survey. As detailed as possible.