A major certifying body issued a “materially wrong” certificate for the combustible ACM cladding used on the refurbishment of Grenfell Tower based on partial test data and information on the supplier’s website, a former project manager at the organisation has admitted.

For nearly a decade, the British Board of Agrément stated that the ACM cassette panels supplied by materials firm Arconic were safe to use on high rise buildings in the UK without seeing the full data, the Grenfell inquiry has heard.

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