In March 2020, as Covid was spreading across northern Italy, there was a frantic attempt by health authorities to get hold of ventilators to help patients breathe.
The NHS had between 6,000 and 8,000 in stock but modelling suggested it needed 30,000 by the end of June and 90,000 by November to cope with a predicted influx of patients.
On 16 March 2020, the government launched the 'Ventilator Challenge' - a drive to encourage domestic UK suppliers to develop new machines or modify existing designs.
The project was overseen by cabinet office officials and involved the MHRA, which helped draw up initial specifications and squeezed an approval process that would usually take 18-24 months into just weeks.
A number of major companies were involved, including the carmakers Ford and McLaren, and the electronics giant Dyson.
At the time, the company's founder Sir James Dyson held a number of telephone conversations with government officials, including the then Prime Minister Boris Johnson.
The Covid inquiry was shown WhatsApp messages then sent between ministers and government advisers suggesting Sir James was concerned about the pace of project.
On 20 March 2020, Mr Johnson wrote that "Dyson [was] freaking" and called for "Action this day".
Minutes later ex health secretary Matt Hancock replied, "I have also received the same. I will talk to Dyson and Michael [Gove] and sort it."
Asked about the deal at the inquiry, the government's then chief commercial officer, Sir Gareth Rhys Williams, said it was the only example he could recall in the pandemic where he was asked to put a contract in place "against commercial guidance".
Five days later, on 25 March, Boris Johnson wrote another WhatsApp message to the same group saying that: "Dyson has a ventilator ready to go… It's safe, effective and loses less oxygen. Rhys Williams has blocked it under the misapprehension that oxygen passes through the motor. That is total b****cks."
He accused officials of "fiddling while Rome burns" and added: "Sorry but I'm on a mission. Dyson knows what he's doing and won't risk his global brand reputation delivering dodgy ventilators."