Face coverings are mandatory again on public transport and shops in England as part of measures to tackle the Omicron variant.
People arriving in the UK will have to take a PCR test and self-isolate until they receive a negative result.
UK health security chief Dr Jenny Harries tells public not to socialise at Christmas with people you "don't particularly need to"
But Boris Johnson later clarifies: "We are not changing the guidance on how you should be living your life"
Omicron was in Europe earlier than first believed, it emerges, with cases found in samples taken in the Netherlands.
The variant was present in samples taken between 19 and 23 November - before it was identified in South Africa.
All adults in the UK are now being offered boosters and the NHS says people will be called in priority order.
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