A government official reprimanded the UK’s leading construction products certifier after it made a “dangerously misleading” error in its certificate for an insulation product used on Grenfell Tower, the inquiry has heard.

The British Board of Agrement (BBA) said in its certificate for Kingspan’s K15 insulation that the combustible insulation could be used in accordance with amendment 12.7 of Approved Document B of the building regulations, which covers fire safety matters.

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