Everyone in England must stay at home except for permitted reasons during a new coronavirus lockdown expected to last until mid-February, the PM says.
All schools and colleges will close to most pupils and switch to remote learning from Tuesday.UK Prime Minister Boris Johnson warned the coming weeks would be the "hardest yet" amid surging cases and patient numbers.
He said those in the top four priority groups would be offered a first vaccine dose by the middle of next month.
All care home residents and their carers, everyone aged 70 and over, all frontline health and social care workers, and the clinically extremely vulnerable will be offered one dose of a vaccine by mid-February.
Scotland earlier issued a stay-at-home order and Wales said schools and colleges would shut until 18 January for most pupils.
Schools in Northern Ireland will have an "extended period of remote learning", the Stormont Executive said, BBC reported.