coronavirus mutant strain may beat current vaccines.Sir John Bell, regius professor of medicine at Oxford University, said it is more worrying than the Kent variant "by some margin".He believes it is already in the UK - and it could take months to develop a new vaccine if it turns out to be resistant.And he warned the UK will see "lots of variants" but urged Brits to stay calm.Sir John, a member of the Government’s vaccine task force, said he thinks the current two Covid-19 jabs by Pfizer and Oxford/AstraZeneca would be effective against the Kent strain.But he said there was a "question mark" over if they would be effective against the South African strain.He told Times Radio: "As to what my gut feeling is that I think the vaccine will be.