After a two-hour cabinet meeting on Monday (20 December), the prime minister said the government was reviewing data on the new Omicron variant of Covid-19 on an "hour by hour" basis, and urged the public to exercise caution.
"Unfortunately, I must say to people, we will have to reserve the possibility of taking further action to protect the public and public health, and protect our NHS and we won’t hesitate to take that action," Johnson told the BBC.