A technical manager at Kingspan said that a facade engineering consultant could “go fuck themselves” after they raised doubts about the fire safety of a combustible insulation product later installed on Grenfell Tower, the inquiry has heard.

Philip Heath made the comments in a 2008 email to a friend after the specialist, Wintech, had advised contractor Bowmer & Kirkland that Kingspan’s Kooltherm K15 insulation was not suitable for a high-rise project.

The contractor had sought assurances that the insulation was safe for use on a tower scheme it was working on, as the test report being used to market the product only applied to the specific set-up which was tested.

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