The UK government has already ordered 100m doses of the vaccine, developed with AstraZeneca.
Scientists found one dosing regimen may actually provide 90% protection against Covid-19.
There are still a few hurdles to overcome before the Pfizer vaccine is available – and perhaps even more if you aren't on the priority list.
People involved in the Oxford University trial have stressed there's no cause for concern.
The White House had been hoping to jump the queue for a British vaccine, according to reports.
The UK has become the first Western country to have a clinically approved vaccine. Here's where things stand with the others jabs being developed.
Business secretary Alok Sharma said the new agreements would “ensure the UK has the best chance possible of securing a vaccine that protects those most at risk”.
Pharma giant AstraZeneca says it's "too early to comment on pricing post-pandemic".
Business secretary Alok Sharma hails deal between AstraZeneca and Oxford University to manufacture vaccine.
As drugs giant AstraZeneca halts UK investment over 'uncertainty’.