‘Vaccinating everyone on the planet against Covid-19 regularly every four to six months is not sustainable or affordable; the most at risk should be identified and prioritised instead’, says Professor Sir Andrew Pollard, who helped develop the Oxford-AstraZeneca vaccine. He said the vaccine rollout had gone ‘extremely well’ in the UK, but other parts of the world were falling behind. ‘We haven't even managed to vaccinate everyone in Africa with one dose, so we're certainly not going to get to a point where providing fourth doses for everyone is manageable. There is not full certainty on whether another booster might be needed in the UK.’ He said the UK would be in a good position if variants continued to lead to milder disease, as has been the case with Omicron. Boris Johnson said the Government doesn't see any data to suggest that further restrictions would be the right approach in England, but the public should be in no doubt it will be a difficult time for the NHS.