Almost half of the population of England is due to receive a coronavirus booster jab this autumn, ahead of another expected wave of infection this winter.
This booster programme is being rolled out in parts, with care home residents and the most elderly or vulnerable receiving the vaccine first - with all over 65s now eligible for their jab.
Covid expert and founder of the ZOE symptom reporting app, Professor Tim Spector, cautioned that the UK is already seeing the start of this next wave, with one in 44 Brits already infected with the airborne virus that has caused global death, lockdowns and restrictions since first emerging in December 2019.