Kingspan’s technical director has denied the firm acted in a “dishonest and disreputable way” when it continued to sell Kooltherm K15 insulation for 14 years using a safety test certificate for a previous version of the product.

Adrian Pargeter also rejected an accusation by Grenfell Inquiry barrister Richard Millett QC that by not withdrawing the test sooner they were “placing the safety of occupants of buildings with K15 on them at serious risk”.