Boris Johnson to hold press conference today amid rising Covid infections

Boris Johnson will address the nation later today at a press conference as government scientists confirmed that a new strain of coronavirus was spreading more rapidly in England.

With just days remaining until a relaxation of rules for Christmas gatherings, the prime minister is expected to outline concerns over increasing cases of Covid-19 alongside professor Chris Whitty, the chief medical officer, and chief scientific officer Sir Patrick Vallance at 4pm.

Mr Johnson has also summoned the cabinet to a briefing at 1pm to discuss the latest situation.

Announcing the variant’s existence earlier this week, Matt Hancock  said it had been discovered in at least 60 different local authority areas, and warned it could be behind the sharp rise in cases in parts of England despite the recent lockdown.

In recent weeks, London has seen surging rates of Covid-19 transmissions, leading to calls for the government to review easing restrictions on travel and household mixing between 23 and 27 December.

However, the health secretary stressed there was no evidence to suggest it would cause a more serious disease, adding it was “highly unlikely” to impact the vaccine the NHS began administering to patients in priority groups last week.

Follow live: Concerns grow over ‘faster spreading’ Covid strain

Ahead of Mr Johnson’s address, professor Whitty said: “As announced on Monday, the UK has identified a new variant of Covid-19 through Public Health England’s genomic surveillance.

“As a result of the rapid spread of the new variant, preliminary modelling data and rapidly rising incidence rates in the South East, the New and Emerging Respiratory Virus Threats Advisory Group (NERVTAG) now consider that the new strain can spread more quickly.

“We have alerted the World Health Organisation and are continuing to analyse the available data to improve our understanding.

“There is no current evidence to suggest the new strain causes a higher mortality rate or that it affects vaccines and treatments although urgent work is underway to confirm this. Given this latest development it is now more vital than ever that the public continue to take action in their area to reduce transmission.”

Sir Mark Walport, a member of the the government's Scientific Advisory Group for Emergencies  told BBC Newsnight the new variant appeared to have a “transmission advantage”.

"We know that this is a new variant, it has been seen in other countries but it seems to be quite widespread which suggests that it has got a transmission advantage,” he said. “It does definitely seem possible that this transmits more easily."

Jeremy Hunt, the former Conservative health secretary, told BBC Radio 4’s Today programme that if the government did not want to change the law on festive gatherings, they should consider strengthening the guidance on social distance.

"It is a very difficult, finely-balanced judgment. The biggest worry is what happens indoor in family gatherings and that's where the risks do increase,” he said.

"They have to respond to what is happening on the ground. I think they can be clearer about what is and isn't advisable because it would be an enormous tragedy if we had a spike in deaths at the end of January/February because we took our foot off the pedal this close to having a vaccine."