One in three care home workers has not been vaccinated but Downing Street suggests mandating immunisation would be “wrong”.
It comes as scientists working on the Covid vaccine raise the prospect of having a booster dose available by the autumn.
Nadhim Zahawi says government will be doing "more".
But minister says public should ask their GP for proof if its needed to travel abroad.
Vaccines minister Nadhim Zahawi said the later hours could work better as younger age groups are offered the jab.
Dr Rosena Allin-Khan the public allegation against Nadhim Zahawi based on "rumours" she had heard.
Sir Desmond Swayne appears to liken “vaccinationism” to other forms of discrimination like sexism and racism.
But he added that "individual businesses have the capacity to make decisions about who they will admit and why".
Nadhim Zahawi, a junior business minister, will oversee what has been described as a "mammoth logistical operation".
As US buys up world’s supplies of Remdesivir, UK calls for more "collaboration".