Philip Heath is a middle manager at Kingspan whose email correspondence was released this week as part of the Grenfell inquiry.  The correspondence shows, over the course of four years, his communication with clients, partners, regulators and underlings about Kingspan’s K15 insulation product. K15 is Kingspan’s market-leading insulation product, installed on thousands of buildings. And K15 is one of the insulation products that was fixed to cladding on the outer walls of the Grenfell tower. Tower block residents are told, in case of a fire, to stay in their flat. The buildings are designed to stop fires moving between floors. …