Boris Johnson lifted the lid on the move to Plan B including Covid passes and work from home guidance.
The Prime Minister delivered a Covid briefing on Wednesday as he announced the Government is implementing Plan B.
The No10 Downing Street conference began just after 6pm on Wednesday.
In the Commons, Sajid Javid has warned Omicron Covid cases could exceed 1 million in a month.
It comes as Allegra Stratton quit as adviser to Mr Johnson after the PM apologised “unreservedly” for leaked footage of aides joking about a lockdown Christmas gathering.
The Prime Minister admitted he is “furious” as he faced a barrage of questions over whether he has told the truth about an alleged Downing Street Christmas party.
Downing Street has insisted “there was no Christmas party” and Covid-19 rules were “followed at all times”.
Mr Johnson has launched an inquiry into claims Downing Street staff broke lockdown rules.