It was “common knowledge” an insulation product installed as part of the refurbishment of Grenfell Tower had been using a fire test report for a different product, a former project manager at its manufacturer has admitted.

Kingspan technical project manager Ivor Meredith told Monday’s hearing of the Grenfell Inquiry that he was aware that the firm’s Kooltherm K15 insulation had been using a 2005 test report of an older version of the product, known by the firm as ‘old technology’ K15, and had flagged his concerns to senior staff.