In a pre-recorded remarks, Prime Minister Boris Johnson will address Covid on BBC One at 20:30 GMT on Sunday.
The booster programme is expected to be updated by him. No more new restrictions will be introduced, according to the BBC.
On Sunday night, the chief medical officers for England, Scotland, Wales, and Northern Ireland recommended that the warning level be elevated from three to four, indicating that the spread of Covid is accelerating.
High or rising transmission levels are indicated via a five stage, color-coded scheme.
That system is unaffected by any decisions made by the government to tighten regulations.
This early information suggests that Omicron is spreading considerably more quickly than Delta, and that vaccine protection against Omicron-induced symptoms is diminished.
Hospitalizations from Omicron are already taking place, and the number is expected to rise dramatically in the following weeks.
Non-Covid pressures are putting a lot of strain on the NHS at the moment." We are expected to see this pressure rise as a result of the spread of a variation with greater transmissibility and reduced vaccination efficacy."
Since May, the UK has been at level three, having been at level four from late February to early May this year.
They recommended everyone to get vaccinated and a booster shot, and warned people should keep rooms ventilated, wear masks, take regular tests and self-isolate if they are symptomatic. The chief medical officials
Covid symptoms appear to be prevented in about 75% of persons who receive a third booster dose of Omicron.
There will be an online booking system for booster jabs for individuals aged 30 and over in England and Scotland starting Monday, and for those ages 18 to 29 later in the week in Scotland. Booster jabs will be given to all adults in Wales by the end of January, while those in Northern Ireland over the age of 30 will receive them at walk-in clinics.
On Saturday, the second day of the booster deployment, more than 500,000 booster shots and third doses were administered in the United Kingdom.
English self-isolation laws have also been revised. Vaccinated people who come into contact with a Covid will no longer be required to self-isolate, but will instead undergo daily lateral flow testing for seven days. This change will take effect on Tuesday.
Following a series of new Plan B measures by the UK government, including Covid passports for some crowded events and asking individuals to work from home, the newest rule change is this: We could see new restrictions in the next few weeks from both Wales and Scotland.
An earlier statement by Education Secretary Nadhim Zahawi indicated a third of instances of Omicron in London were due to the variation.
Zahawi refused to provide any assurances when asked if all schools will be open in January, stating only that "everything in my power" would be done.
By April, the amount of deaths from Omicron might vary from 25,000 to 75,000 (depending on how well immunizations work) if there are no more limitations.