Cladding specialist Harley Facades has denied accepting a “hefty” discount on a supposedly new Celotex insulation product in return for using Grenfell Tower as a “guinea pig” for the product.

Ben Bailey, Harley Facades’ project manager for the ill-fated refurbishment – which led to 2017’s inferno and the loss of 72 lives – acknowledged on Monday that the firm had been in discussions about using the project as a “case study” for the insulation firm.