philip heath — then a technical manager for kingspan — admitted his expletive—ridden responses had beenwing its insulation, despite it failing a fire test. our home affairs correspondent tom symonds reports. kingspan, multi—national producer of insulation — added to walls to make buildings warmer. not a famous brand, it's usually tucked away out of sight, until now. because when stocks of another brand ran out, builders chose kingspan k15 insulation for grenfell‘s walls and its flammable. i can only apologise for the contents of this e—mail... but when a client queried that in 2008, technical manager philip heath e—mailed that they were, "getting me confused with someone who gives a damn." "imagine a fire running up this tower," he added. a kingspan employee wondered if there might be legal issues. a barrister read out mr heath's response. wintech can go bleep themselves and if they're not careful we'll sue the arse off them." can you explain why you wrote that given win tech were giving entirely accurate advice to their customers? it was totally unprofessional at that time and with...