What is the Covid workplace testing scheme Downing Street is part of?

Boris Johnson and Rishi Sunak were due to be part of a pilot trialling tests instead of self-isolation

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Could Boris Johnson and Rishi Sunak have avoided the need to self-isolate for 10 days despite being contacts of the health secretary, Sajid Javid, who tested positive for Covid-19? On Sunday morning, Downing Street claimed they were due to be part of a workplace pilot scheme trialling tests instead of isolation. However, an abrupt U-turn in the face of public anger means the prime minister and chancellor will now self-isolate.