The government will hold an emergency committee meeting on Omicron at the weekend with the devolved administrations in Scotland, Wales and Northern Ireland, UK Prime Minister Boris Johnson's office said after he spoke with Scottish First Minister Nicola Sturgeon.
Johnson and Sturgeon agreed that Omicron posed a "significant threat to health and the economy," a spokesperson for the Scottish leader said.
The UK Health Security Agency (HSA) said Omicron cases were doubling in less than two days in all regions of England, apart from the southwest.
The variant is already estimated to account for more than 80 per cent of new cases in London.
The UK is racing to get booster vaccines into arms to counter the rapid rise in infections.
The variant has not caused large-scale hospitalisations or deaths as yet although there is always a lag between infection and severe disease.
It accounted for 65 patients in England's hospitals on Friday, the HSA said, with the number of deaths remaining at one.
A study by Imperial College London on Friday showed the risk of reinfection with Omicron was more than five times higher than with the Delta variant, and it had shown no sign of being milder.
The number of deaths within 28 days of a positive COVID-19 test from all variants in the UK on Friday was 111 versus 146 on Thursday, government data showed.
