Scientists to announce decision on UK booster rollout

Key Facts

Nine cases of the Omicron variant have been found in the UK so far and Number 10 has set out measures to contain it.
If Omicron does prove to be a problem then boosting is the quickest way of enhancing people's protection as it will take about 100 days to update the vaccines if (and it is a major if) that turns out to be necessary.
Under the rules due to come in on Tuesday: Everyone entering the UK (other than those coming from the Common Travel Area that covers the Channel Islands and Ireland) will have to take a PCR test by the end of the second full day after their arrival and self-isolate until they receive a negative result All contacts of suspected Omicron cases must self-isolate, regardless of whether or not they are fully vaccinated * Face coverings will be made compulsory on public transport (bringing England into line with the other UK nations) and in shops - but pubs and restaurants will remain exempt.
In a joint letter with the Welsh First Minister Mark Drakeford to Mr Johnson, she has requested increased measures that would see UK arrivals isolate for eight days - with PCR tests on day two and day eight.