UK Prime Minister Boris Johnson has imposed tougher COVID-19 restrictions in England, ordering people to work from home, wear masks in public places and use vaccine passes in a bid to slow the spread of the Omicron variant. The move comes as an adviser to UK Prime Minister Boris Johnson, Allegra Stratton, quit after a video surfaced of her laughing and joking about a party in Downing Street during a Christmas COVID-19 lockdown last year when such festivities were banned. In the video aired by ITV, Ms Stratton was shown at a rehearsal for a daily briefing laughing and joking about a reported gathering at a time when tens of millions of people across the UK were banned from meeting family and friends to celebrate Christmas, or even from bidding farewell to dying relatives. For more on this story visit: https://www.sbs.com.au/news/uk-impose... Subscribe for more live media conferences from SBS News or visit sbs.com.au/news for all the latest updates on the coronavirus outbreak. You can also follow us on Facebook, Instagram, Apple News and Twitter.