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.

Former BBA project manager Valentina Amoroso admitted that in 2015 she had renewed a certificate giving Arconic’s Reynobond PE panels a class 0 rating, which cleared them for use on buildings above 18m, despite never receiving crucial updated test data from the firm which showed that the cladding fell far short of this rating.

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