Some observers have warned that the coronavirus epidemic has made a quick deal impossible.
The OBR warned that the impact of the pandemic could initially be a bigger shock to the UK economy than the 2008 financial crisis and even the world wars.
The government to decide whether to maintain three-week-old rules to keep schools and shops shut and order people to stay in their homes.
The rally followed months of slumping prices after the COVID-19 outbreak sapped demand as countries around the world are under lockdown.
Officials said he would now convalesce at Chequers, the country estate of British prime ministers, on the advice of his medical team.
More than 1.8 million people have been infected but glimmers of hope were emerging that the worst may be behind -- especially in Europe.
Johnson left intensive care at London's St Thomas' Hospital on Thursday evening, three days after being admitted due to his then-worsening condition.
The British government announced another 881 deaths on Thursday, taking the UK total to 7,978.
Newspapers urged Britons to keep their leader in their minds, with a lockdown to try to stem the spread of COVID-19 now in its third week.
Boris Johnson was admitted to hospital on Sunday evening "for close monitoring," and was given oxygen late on Monday afternoon before being taken to ICU.
In an update Tuesday evening, the prime minister's spokesman said his "condition is stable and he remains in intensive care for close monitoring."
After Johnson was taken to hospital on Sunday night, and transferred to intensive care, Raab now looks set to be in charge for the foreseeable future.
Johnson has deputised his foreign secretary, Dominic Raab, to stand in for him, but remained conscious according to Downing Street.
The British Prime Minister is the most high-profile world leader to contract the virus.
The 93-year-old monarch drew on her experience in World War II, offering a message of hope to people forced to separate from family and friends.
The pledge came on the day the UK recorded more than 500 daily deaths for a second consecutive day.
UK ministers have been put on the back foot as criticism over the lack of testing grows.
The monarch and her husband Prince Philip, 98, are self-isolating in Windsor Castle due to the coronavirus pandemic.
Heir to the throne, Prince Charles, also tested positive earlier this week.
According to reports, the original order placed with Dyson was for 10,000 ventilator units to be distributed to the country's National Health Service (NHS).
Queen Elizabeth II and the rest of the royal family practice social distancing amidst coronavirus outbreak.
Prime Minister Boris Johnson on Monday imposed a three-week lockdown to tackle the outbreak, which has seen 422 deaths and 8,077 cases in Britain.