New UK variant of coronavirus may be more deadly, says Boris Johnson Updated: Updated: January 23, 2021 01:56 IST But the British PM stresses that the two vaccines being administered in the UK are effective against all strains Share Article AAA Britain's Prime Minister Boris Johnson speaks during a coronavirus press conference at 10 Downing Street in London, Friday Jan. 22, 2021. | Photo Credit: AP But the British PM stresses that the two vaccines being administered in the UK are effective against all strains British Prime Minister Boris Johnson on Friday said early evidence suggests that the new variant of coronavirus that was detected in England towards the end of last year may be associated with a higher degree of mortality.