PM and Chancellor to isolate following furious backlash over quarantine escape plan

But in a dramatic turnaround Downing Street said the two ministers would be self-isolating rather than taking part in a daily contact testing pilot.

“The Prime Minister has been contacted by NHS Test and Trace to say he is a contact of someone with Covid,” a spokesman said.

“He was at Chequers when contacted by Test and Trace and will remain there to isolate. He will not be taking part in the testing pilot.

“He will continue to conduct meetings with ministers remotely. The Chancellor has also been contacted and will also isolate as required and will not be taking part in the pilot.”

The u-turn came less that three hours after No 10 announced the two ministers would carry on working in Downing Street while taking daily tests.

It is part of a programme being trialled across 20 public and private sector organisations including Border Force and Network Rail as well as the Cabinet Office and No 10.

That sparked outrage amid warnings it risked undermining the Government’s messaging on continuing to self-isolation at a critical point in the pandemic.

Labour leader Sir Keir Starmer said the Government was in “chaos” at a time when in needed to maintain public confidence.

“Boris Johnson and Rishi Sunak have been busted yet again for thinking the rules that we are all following don’t apply to them,” he said.

“The way the Prime Minister conducts himself creates chaos, makes for bad government and has deadly consequences for the British public.

“Yet again the Conservatives fixed the rules to benefit themselves and only backtracked when they were found out. They robbed the bank, got caught and have now offered to give the money back.”

The decision means the Prime Minister will now spend so-called “freedom day” on Monday when most lockdown restrictions end in England confined to his official country residence.

It came as one scientist involved in advising the Government warned that new cases could reach 200,000 a day before the current wave of the virus peaked.

Professor Neil Ferguson, whose modelling was instrumental in the Government’s decision to order the first lockdown in March 2020, said it was “inevitable” they would at least reach 100,000 a day.

“The real question is, do we get to double that or even higher? And that’s where the crystal ball starts to fail. We could get to 2,000 hospitalisations a day, 200,000 cases a day, but it’s much less certain,” he told BBC1’s The Andrew Marr Show.