Omicron could become the UK's dominant variant within weeks, says infectious diseases expert Prof Paul Hunter.
He estimates it's likely that there are already more than than 1,000 cases - four times more than officially confirmed.
The return of pre-departure Covid tests for travellers to the UK will come into force on Tuesday.
And Nigeria is now on the UK's red travel list - arrivals from the country will now have to spend 10 days in hotel quarantine.
There has been some criticism that these changes have come too late, but Boris Johnson says the UK acted very quickly on Omicron.
And the UK government says it is doubling the number of hotel rooms for travel quarantine to cope with demand.
South Africa is preparing its hospitals for more admissions amid a fourth wave driven by the new variant, its president says.
Separately, people can now show evidence of a negative Covid test to get into clubs, concerts or large events in Scotland.
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