Early indications suggest the Omicron variant of coronavirus is "more transmissible" than Delta, Downing Street says.
But much remains unknown and the government is not looking at introducing its Plan B level of restrictions, a spokesman tells reporters.
Scientists are yet to draw firm conclusions but are continuing to analyse samples of the virus and real-world data.
People travelling to the UK must now take a Covid test before their journey as well as a PCR test upon their return.
There are currently 336 confirmed cases of the highly-mutated Omicron variant in the UK
Experts believe it could overtake Delta to become the dominant variant.
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