Chief Medical Officer Professor Chris Whitty and Chief Scientific Advisor Sir Patrick Vallance addressed the public on Monday, and their demeanor was stern. Britain, Whitty said, had “turned a corner” in the fight against the deadly coronavirus, in a “bad way.” Vallance then explained that new cases are “roughly doubling” in the UK every week, and left unchecked, he predicted there could be “something like 50,000 cases in the middle of October per day.” Concurrent with this would be "200-plus deaths per day.”

“The virus has genetically moved a bit, but it has not changed in terms of its propensity and its ability to cause disease and to cause death,” Vallance said. “There’s no doubt we’re in a situation where the numbers are increasing. I’d like to remind you just how quickly this can move.”

Vallance and Whitty’s prediction is just that: a prediction. It assumes that the current growth rate will continue exponentially, and that deaths will rise proportionally. Predictions, however, can be wrong. Modelling by Imperial College London in spring suggested that half a million Britons would die of Covid-19. This modelling informed the government’s ‘stay at home’ policy, before it was revealed to be founded on faulty data. Its projected death toll was revised down to 20,000, a figure that was wrong too, as nearly 42,000 have died so far.

For cases to double every week, the virus would need a daily growth rate of just over 10 percent. However, current government estimates put the daily growth rate somewhere between two and seven percent. Should that rate remain the same, Valance and Whitty’s prediction would be twice as severe as reality.

The two advisers also dismissed the notion that the virus was growing less deadly, despite death rates across Europe dropping off in recent months, and claimed that the increase in cases was not driven by an increase in testing.

The pair were accused online of fearmongering, with their worst-case scenario described as something from “a bad horror movie.”

Some commentators took the ominous briefing as a sign that the government is preparing to implement a fresh round of lockdown measures. Ministers reportedly debated a host of potential new restrictions over the weekend, and Prime Minister Boris Johnson is due to address parliament on Tuesday, after a round of emergency meetings on Monday afternoon.

According to a report in the Telegraph on Friday, the measures being considered include curfews, further limits on socializing and shorter opening hours for pubs and restaurants.

Some want the government to go even further. Shortly after Vallance and Whitty gave their briefing, Labour MP Geraint Davies called for staggered classes in schools, mask mandates, and, curiously, the use of drinking straws in pubs.

Still, even within the scientific establishment, opposition is growing to Johnson’s policy of lockdowns and restrictions. In an open letter to the prime minister and his health chiefs, a group of more than two dozen scholars on Monday urged the government to isolate the most vulnerable sectors of the population and ease restrictions on the rest, calling the current goal of suppressing the virus until a vaccine arrives “unfeasible.”

Some commentators took the ominous briefing as a sign that the government is preparing to implement a fresh round of lockdown measures. Ministers reportedly debated a host of potential new restrictions over the weekend, and Prime Minister Boris Johnson is due to address parliament on Tuesday, after a round of emergency meetings on Monday afternoon.

According to a report in the Telegraph on Friday, the measures being considered include curfews, further limits on socializing and shorter opening hours for pubs and restaurants.

Some want the government to go even further. Shortly after Vallance and Whitty gave their briefing, Labour MP Geraint Davies called for staggered classes in schools, mask mandates, and, curiously, the use of drinking straws in pubs.

Still, even within the scientific establishment, opposition is growing to Johnson’s policy of lockdowns and restrictions. In an open letter to the prime minister and his health chiefs, a group of more than two dozen scholars on Monday urged the government to isolate the most vulnerable sectors of the population and ease restrictions on the rest, calling the current goal of suppressing the virus until a vaccine arrives “unfeasible.”