British Prime Minister Boris Johnson says he is perfectly well after coming into contact with someone with COVID-19.

Mr Johnson, 56, said he will drive the Government forward via Zoom while he self-isolates for two weeks in Downing Street.

His latest brush with COVID comes after a tumultuous week in which his most senior adviser, arch Brexiteer Dominic Cummings, was ousted after clashing with a rival faction led by Mr Johnson's fiance and his new spokeswoman.

From a flat above Downing Street, Mr Johnson will have to grapple with Europe's deadliest COVID-19 outbreak and master the delicate diplomacy needed to clinch a last-minute Brexit trade agreement within days.

"I'm fit as a butcher's dog — feel great," Mr Johnson said in a video tweet, smiling and wearing a jumper with an open shirt.

"I'm bursting with antibodies.

"Plenty more to say via Zoom of course and other means of electronic communication."

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Mr Johnson announced on Sunday that the NHS Test and Trace scheme told him to self-isolate for two weeks after it was confirmed MP Lee Anderson, who attended a 35-minute meeting with the Prime Minister, had tested positive.

"He's well, he's absolutely full of beans," Health Secretary Matt Hancock told Sky News.

"He'll be, I've got no doubt, driving things forward this week by Zoom."

Mr Johnson previously tested positive to coronavirus in April.

He was taken to hospital on April 5, before being admitted to intensive care the next day after his symptoms worsened.

He spent three nights in intensive care at London's St Thomas' Hospital before moving to his country residence Chequers to recover.

Vaccinations not until 2021, health minister says

Meanwhile, the country has grappled with rising infection rates, recording 1,372,884 coronavirus cases and 52,026 deaths, according to Johns Hopkins university data.

But Mr Hancock told Sky News the majority of people in the UK would not be vaccinated until next year at the earliest.

"Even if that [vaccine] comes through as fast as it possibly could, the vast majority of people will be, we'd expect, to be vaccinating in the new year," he said.

He added the Government was working hard to be prepared to roll out the vaccine when it becomes available, and different administrations across Britain hoped to agree to a set of rules so that people could meet at Christmas.

"We're absolutely working to make Christmas as normal as possible," he said.

Reuters/ABC