It has been nearly two weeks since Britain's pubs, restaurants, hairdressers and shops reopened and, so far, things appear to be going according to plan. Covid-19 cases are continuing to fall and deaths are below 40 a day. Last week, Government data showed that only 32 fully vaccinated people have been admitted to hospital with Covid-19. But scientists say Britain could be quickly pulled back into chaos by dangerous Covid variants – mutated versions of the original coronavirus that could escape the protection offered by the vaccines. Last week, 132 cases of a new Indian variant were picked up in the UK. It has been frighteningly named a 'double mutant', as it carries two significant changes to the spike protein – the part of the virus that allows it access to human cells.