The BBA’s procedures were not “designed to cope with a situation where a manufacturer would deliberately withhold fire test data”, its chief scientific officer has admitted.

“We may well have been naive but I don’t think that suspicion that someone was deliberately misrepresenting the performance of their product in a safety-critical manner would have occurred to us,” John Albon told the Grenfell Inquiry.

He also accepted the BBA had made “a very basic failure of due diligence”.

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