COVID-19 vaccine
England’s deputy chief medical officer Jenny Harries says the impact of vaccinations must be known first.
Sarah Gilbert of Oxford University also told MPs there was a danger transmission could increase.
Understandably, some people are a little impatient for Covid rules to end but it’s totally reasonable to keep them.
The latest sign that lockdown and the vaccination roll-out is curbing the spread of coronavirus.
But Boris Johnson says there is "no question" they will be needed for some international travel.
The prime minister has revealed how and when restrictions could end, but warned local action could be necessary.
Millions living in different parts of country will see each other for first time in months. And international travel could start as early as May 17
The figures come as Boris Johnson reveals his roadmap out of lockdown.
The criteria will inform Boris Johnson's government as to when further easing of restrictions can be introduced.
It comes amid a clamour of warnings from scientists to act gradually.