Kensington and Chelsea Tenant Management Organisation’s project manager for the Grenfell Tower refurbishment was frustrated by main contractor Rydon’s slow progress with the job and felt “let down” by advisor Artelia, the probe into 2017’s fatal fire has heard.

Claire Williams told yesterday’s Grenfell Tower Inquiry hearing that she had been actively involved in a formal complaint sent to Rydon regeneration director Stephen Blake in March 2016, when the project was less than two months away from its target practical completion date.