The Prime Minister also said everyone should be able to receive a vaccine within ten miles of their home, as he set out details of a vaccination programme “on a scale like nothing we have seen before”.
Mr Johnson added that the Government intended to give everyone in care homes a jab by the end of January.
Speaking at a Downing Street press conference, the Prime Minister said: “We’ve now vaccinated 1.26 million people in England, 113,000 in Scotland, 49,000 in Wales and 46,000 in Northern Ireland.
“So, all together, nearly 1.5 million people across the UK have now received their first dose and within two to three weeks all of them will have a very considerable degree of immunity.
“It is thanks to the arrival of the Oxford/AstraZeneca vaccine, which can be stored at room temperature, that we can accelerate the pace of vaccination in care homes.
“We’re using that vaccine in care homes for the first time today and by the end of the month we hope to have offered every elderly care home resident a vaccine.”