A key manager on the refurbishment of Grenfell Tower did not know that his firm’s two preferred overcladding options for the block had different fire-safety ratings, it has emerged.

Main contractor Rydon’s contract manager Simon Lawrence told the Grenfell Tower Inquiry he was unaware that a face-fixed version of the aluminium composite material (ACM) cladding system chosen for the job had a better fire-safety rating than the cassette system that was eventually used.