A “slack and complicit” testing and certification industry should take more blame for allowing combustible materials to be fitted to Grenfell tower than the project team which worked on the block’s disastrous refurbishment, the inquiry into the fire has heard.

Marcus Taverner QC, representing main contractor Rydon, said that testing houses and certifying bodies had given “assistance” to manufacturers of dangerous cladding products to exploit an “inadequate regulatory regime”.

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