Johnson imposes COVID-19 'Plan B' in England to contain Omicron

Undermined by accusations that his staff partied at Downing Street during a Christmas lockdown last year, Johnson said Omicron was spreading rapidly and he had no choice but to move to "Plan B" while a vaccine booster programme rolls out. While still a long way from the full lockdowns imposed earlier in the pandemic, the new measures were described as a "hammer blow" for city centre restaurants, cafes and shops that are desperate for Christmas trade to rebuild their finances.

Many lawmakers in Johnson's own party are also angry with the new restrictions, fearing the impact they will have after the economy shrank by a historic 10% last year.

"While the picture may get better, and I sincerely hope that it will, we know that the remorseless logic of exponential growth could lead to a big rise in hospitalisations and therefore, sadly, in deaths," Johnson told a news conference.

Johnson, who lifted most COVID restrictions in England in July following a rapid vaccine rollout, had vowed to navigate the winter without resorting to a fourth COVID-19 lockdown, but had kept a so-called Plan B in reserve.

Part of those measures, such as reintroducing masks on public transport and in shops, had already been brought in, but on Wednesday Johnson said people should also now work from home.

Face masks will be required in public venues such as theatres and cinemas and a COVID pass will be mandatory for access to large crowds.

Johnson said the new measures were needed after 568 cases of Omicron were found in the country, with data suggesting its doubling time of infections could be between two and three days.

Health Secretary Sajid Javid said officials estimated that the number of Omicron infections was actually around 20 times higher than the number of confirmed cases, meaning they could be closer to 10,000.