Here's a BBC News website article that goes into some detail;
https://www.bbc.co.uk/news/55163730
It seems there is an 'emergency' clause in the EU regulations that allows member countries to approve vaccines on a temporary basis.
Since the UK is still working within EU regulations until 1st January 2021 we had no choice but to use this measure to approve the Pfizer vaccine.
For the next 29 days we do not have the authority to approve the vaccine outside the EU regulations.
That's how I read it anyway.
Practically it will make no difference.
But it's stretching the truth more than a bit (in my view) for Ministers or Politicians to claim The UK approved the vaccine first because of Brexit.
They are plainly implying that we could only approve the vaccine first because of Brexit - which is not true.
I have read (in another place) that although Countries can approve outside the EU mechanism the other 26 have followed the German plan on waiting on the EU regulator ..... if we were still in the EU the UK would have almost certainly have waited for the Europeans to approve the vaccine before approving it ourselves. This is the way it always worked for the UK in the EU, even under Maggie Thatcher we ALWAYS followed the rules
