A major certifying body may have based the fire rating it gave a combustible insulation product which was used on the refurbishment of Grenfell Tower on tests of different products, the inquiry has heard.

The former deputy chief executive at the British Board of Agrément (BBA), Brian Moore, admitted it was “more likely than not” that the classification of Kingspan’s K15 insulation had been “extrapolated” from test reports on other phenolic foam products produced by the firm dating back as far as 1991.

Moore, who joined the BBA in 2014, told Tuesday’s hearing that there were no records of test data being received by Kingspan in the folder of a 2008 certificate which gave the product a Class 0 rating, with the folder’s fire section instead containing a series of fire reports on other Kingspan products.

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