But the idea that Brexit enabled the UK to press ahead and authorise one is not right.
It was actually permitted under EU law, a point made by the head of the UK's medicines regulator on Wednesday.
What are EU rules on approving vaccines?
Under European law a vaccine must be authorised by the EMA, but individual countries can use an emergency procedure that allows them to distribute a vaccine for temporary use in their domestic market.
Britain is still subject to those EU rules during the post-Brexit transition period which runs until the end of the year.
The UK's own medicines regulator, the MHRA, confirmed this in
a statement last month.
And its chief executive, Dr June Raine, said on Wednesday that "we have been able to authorise the supply of this vaccine using provisions under European law, which exist until 1 January".