The sales executive at the firm which sold the combustible ACM cassettes used on Grenfell Tower’s ill-fated refurbishment was told by her manager not to share technical documents about the product to customers, the inquiry into the 2017 fire has heard.

Emails shown to the inquiry revealed how Deborah French, the UK sales manager at cladding manufacturer Arconic, was ordered to withhold information from Arup which outlined the differences between two versions of the firm’s Reynobond panels.

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