When I bought my house here in Atlanta, I had it inspected beforehand, and an adequate inspection report was a condition of my purchase offer. The inspection disclosed some mold in the basement drywall, and we negotiated a split on the removal costs, before the purchase was completed.
In US real estate, sellers are required to disclose any defects in the property they are aware of, or they can be sued for damages later, and independent property inspections are a regular part of the purchase process. Is this not a part of UK property transactions? While the apartment towers may have been compliant when built, standards change over time through experience.