COVID-19: Rules tightened for Christmas for England, Scotland and Wales

It further said that from midnight onwards a new tier four will be introduced in areas including London, Kent, Essex and Bedfordshire.

These new restrictions were announced by Prime Minister Boris Johnson after scientists said a new coronavirus variant was spreading more rapidly, BBC reported.

Under tier four even indoor intermixing of people who are not from that household is strictly prohibited.

Meanwhile in England, Scotland and Wales, relaxed indoor mixing rules have been cut from five days to Christmas Day.

Tier-four restrictions - similar to England's second national lockdown - will apply in all areas in the South East currently in tier three, covering Kent, Buckinghamshire, Berkshire, Surrey (excluding Waverley), Gosport, Havant, Portsmouth, Rother and Hastings.

It will also apply in London (all 32 boroughs and the City of London) and the East of England (Bedford, Central Bedford, Milton Keynes, Luton, Peterborough, Hertfordshire, Essex (excluding Colchester, Uttlesford and Tendring).

In Scotland, COVID restrictions will only be relaxed on Christmas Day, with mainland Scotland being placed under the tightest restrictions from Boxing Day.

Outlining the changes, Scotland's First Minister Nicola Sturgeon said she wished she had acted quicker to curb the virus in February, adding: "Standing here saying this actually makes me want to cry."

A ban on travel to the rest of the UK will also apply over the festive period.

In Wales, First Minister Mark Drakeford announced that the country will be placed under lockdown from midnight.

In Northern Ireland, no changes have been made to Christmas restrictions, with three households allowed to meet from 23 to 27 December. The country is set to enter a six-week lockdown from 26 December.