As it happened: UK arrivals face jail and fines for breaking Covid travel rules - BBC News
New rules on testing and quarantine for international arrivals will come into force in England on Monday.
The New and Emerging Respiratory Virus Threats Advisory Group (NERVTAG) - a group of scientists which advise government - have classed a variant first identified in Bristol - the Kent variant with a mutation - as a "variant of concern".

It’s not surprising that officials are adding this new version of coronavirus to their "variants of concern" list.

Targeted testing is already under way to spot any new cases linked to the 21 that have already been found, mostly in the south west of England.

This new incarnation of the virus is the Kent variant "plus". It has the same N501Y mutation as the one that triggered lockdown - a genetic change that scientists say lets the virus spread more easily. But it also has an extra mutation called E484K.

E484K is what experts are worried about for vaccine efficacy. It is also seen in the South Africa and Brazil variants of concern.

A cluster of another variant in Liverpool is different again. It has got the E484K mutation but is an iteration of an earlier version of the pandemic virus rather than the Kent one.

Inevitably, more variants will continue to emerge. The challenge is to make sure vaccines are a good match to keep us ahead in this race against the virus.

Experts are confident that the vaccines being used today will still save lives and stop severe illness from Covid.