"We'll get an idea then of which gives you the highest boost, which perhaps gives you the broadest boost against a range of coronavirus variants, and indeed what the timings look like," he told a press conference.

"That is another reason why the vaccines taskforce has invested in contracts with not just one or two manufacturers, but six or seven so that we have that optionality."
[...]
Britain, which has a population of 67 million, has deals for 517 million doses of eight different COVID-19 vaccines, some of which remain under development.