A tale of “deliberate and calculated deceit”. Beneath the cladding, a layer of insulation surrounded Grenfell Tower. This too was combustible and on the night of the fire, contributed to how quickly the flames spread. The companies which produced this insulation have been accused of misleading the construction industry about how combustible their products were. In this episode, Kate looks through some of the most jaw-dropping evidence from the public inquiry. Internal emails and company documents expose how insulation companies tested, marketed and sold their flammable products. Presenter: Kate Lamble Producer: Josephine Casserly Production coordinator: Janet Staples Audio engineers: James Beard and Gareth Jones Story consultant: Simon Maybin Editor: Penny Murphy