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Boris Johnson is set to give a Downing Street press conference this afternoon as new measures are introduced to curb the spread of the new Omicron variant of Covid 19.

The Prime Minister is expected to speak about the new face mask rules which came into effect at 4am today and the rollout of the booster programme.

Mr Johnson will urge people to get their booster vaccines after Health Secretary Sajid Javid confirmed on Monday that the the rollout was being extended to all over-18s and the gap between second and third doses halved to three months.

He will also likely speak about new travel rules which force all arrivals to take a Day 2 PCR test and isolate until it comes back negative.

Boris Johnson will be joined by Health Secretary Sajid Javid and NHS England chief executive Amanda Pritchard at the 4pm press conference in Downing Street.

It will come after the debate and vote in the Commons on the Covid-19 regulations.

The Prime Minister has also not yet enacted all of England鈥檚 鈥楶lan B鈥� measures, leaving vaccine passports for nightclubs and stadiums in reserve.

And the government has not advised people in England to work from home where possible, despite advice of that kind in Scotland.

Dr Jenny Harries, head of the 海角视频 Health Security Agency (海角视频HSA), said there is a current period 鈥渙f great uncertainty鈥� in understanding the new Omicron variant of coronavirus.

She told BBC Breakfast the booster dose of vaccine will 鈥渨e hope, to some extent, counter the potential drop in vaccine effectiveness we might find with this variant鈥�.

Asked whether the 海角视频 will see a return to work from home guidance, she said: 鈥淭he whole point about the booster programme and the introduction of mandatory face mask-wearing in enclosed public spaces is exactly to try and avoid that because we鈥檝e made huge progress, we have great defences and, in the background, the dominant strain in the 海角视频 at the moment is very definitely Delta.

鈥淪o these vaccines will help that, it will keep serious infection, serious disease and hospitalisations at bay, but we do need this time to try and understand the new variant, and we would much prefer that we have that precautionary approach and then take appropriate actions.鈥�

But the PM鈥檚 spokesman did not rule out tighter travel rules, or tighter rules after the new restrictions are reviewed in three weeks' time.

No10 said was not 鈥減lanning鈥� to adopt the plea for eight days鈥� isolation, but did not rule it out, saying the response would be kept under review.