The UK on Sunday raised its Covid Alert Level due to the "rapid increase" in cases of the Omicron variant, as the government announced new measures to control its spread. Prime Minister Boris Johnson, under pressure because of claims he and staff flouted Covid restrictions last Christmas, was due to make an address to the nation at 2000 GMT. He is expected to talk about the country's booster programme. The decision to increase the five-stage public health risk assessment from level three to four comes after a further 1,239 confirmed cases of the variant were recorded on Sunday. That brings the...