Boris Johnson is set to host another Downing Street press conference tonight to ask people to abide by the new Covid rules in place to tackle the Omicron variant, according to reports from The Mirror.

The Prime Minister is expected to discuss how everyone can do their bit to help save Christmas and slow the spread of the Omicron variant.

Little is known about the new variant, but scientists fear it is more vaccine-resistant than other strains of the virus.

From 4am today (Tuesday November 30) new rules have come in place to try and control its spread, which Mr Johnson will discuss in the press conference.

Face coverings are again compulsory in England in shops and settings such as banks, post offices, hairdressers, and public transport, while all travellers returning to the UK must take a PCR test and self-isolate until they receive a negative result.

All contacts of suspected Omicron cases must self-isolate, regardless of their age or vaccination status.

Additionally, the Joint Committee on Vaccination and Immunisation (JCVI) is now advising that all adults aged 18 to 39 should be offered a booster dose of the Covid-19 vaccine, in order of descending age groups, to increase their level of protection.

Those aged 40 and over are already eligible for a booster vaccine.

The JCVI said booster doses should be given no sooner than three months after people have had their second dose of an original vaccine – shaving three months off the current six-month wait.

The measures in place are described by Number 10 as “temporary and precautionary”, and will be reviewed in three weeks.

When will Boris Johnson's press conference take place?

The press conference is expected to begin around 4pm, according to reports.

Previous press conferences have been available to watch live on the BBC World Service or it can be done through Boris Johnson's Twitter page, which was done with the press conference on Saturday November 27.

It will also be broadcast on all major news channels including BBC and Sky News.