Prime Minister Boris Johnson has resisted tightening restrictions in England despite the rapid spread of Omicron.
British Prime Minister Boris Johnson has been presented with a number of options under Plan C, ranging from "mild guidance to nudge people, right through to lockdown".
The UK Health Security Agency said that if the growth rate and doubling time continue at the rate seen in the last two weeks, they expect to see at least 50 per cent of COVID cases to be 'Omicron'.
The latest case, like the two others, is linked to travel to southern Africa, where the variant was identified, but the individual is no longer in the UK.
Tougher entry rules for foreign flyers, mandatory masks: UK announces new Covid norms as Omicron strain arrives
Britain has already said it is banning travel from six southern African nations because of the emergence of Omicron: South Africa, Namibia, Lesotho, Eswatini, Zimbabwe and Botswana.