The former head of the vaccines taskforce has said the current COVID jabs are "not good enough".
Dame Kate Bingham, who spearheaded the UK's vaccination programme in 2020, also accused the government of going "backwards" in its preparation against future pandemics.
Giving evidence to a parliamentary inquiry into lessons to be learned from the coronavirus pandemic, she said: "Our vaccines currently are not good enough.
"We need to improve the quality of the vaccines, the durability, the ability to stop transmission, the way in which we give vaccines.
"Lots of things need to be improved. Our approach seems to have been to go backwards rather than to continue the momentum."