Toxicologist Professor David Purser told the Inquiry that the rapid spread of smoke was the principal cause of death, and that burning cladding panels and insulation were the main source of this poisonous smoke. The Inquiry also heard closing statements for Module 4, covering the immediate aftermath of the fire. From next week it will turn into an inquest, so for this reason the podcast will not be covering those hearings. The podcast will return when the Inquiry produces its final report for the government.