To enter pubs and clubs, Brits will need three vaccinations for their Covid passport.
Covid passes will soon require users to have had two vaccine doses plus a booster, rather than just the first two injections, according to Health Secretary Sajid Javid.
He went on to say that the change would go into effect as soon as all adults had a "reasonable chance" to get their vaccinations up to date.
"We intend to change this exemption [from showing an LFT for nightclub] to require a booster dose once all adults have had a reasonable chance to get their booster jab," he told the House of Commons today.
People will no longer be considered "fully vaccinated" unless they have received a booster in addition to the initial two main doses, he said.
In response to reports of a shortage of Lateral Flow Tests [LFTs], Mr Javid stated that the government has made "new arrangements" with a number of companies, including Amazon, to ensure that tests are delivered.
"That does not mean every single person can get that booster," he admitted, when asked about the PM's goal of giving every adult a chance to get their booster by the end of the year.
Boris Johnson delivered a special pre-recorded TV address to the nation on Sunday night, warning that the UK is "now facing an emergency" in the fight against the Omicron variant.
He urged every adult to take advantage of the booster shots offered as part of an "Emergency Omicron Boost" as soon as possible.
Everyone over the age of 18 will be offered a booster shot before New Year's Day as part of this effort, bringing the previous deadline of the end of January 2022 forward by a month.
Health officials and doctors have expressed surprise at the new measures, claiming that the NHS is unprepared for such a large-scale implementation.
"This morning please spare a thought for NHS staff who - at exactly the same time you did - found out last night from Boris Johnson they'd be delivering 1 million boosters a day from... today," stunned doctor Rachel Clarke tweeted.
"So, the day after Boris Johnson launches his big booster drive, NHS England runs out of lateral flow tests, the vaccine website goes down, and his key pledge of everyone getting a December booster was a lie," Labour MP Jon Trickett said.
He and Labour Party leader Keir Starmer have urged British citizens to get their vaccinations as soon as possible.
According to government data released earlier today, 38 more confirmed coronavirus deaths occurred in the last 24 hours, bringing the total number of confirmed coronavirus deaths to over 146,000.
Infections have increased by 54,661 in the last day, according to figures.
The Omicron variant was only confirmed to have arrived in the UK on November 27, and the rapidity with which it has spread has alarmed ministers, prompting a dramatic increase in the booster jab program.