What truly pisses me off about this situation is the fact the E.U. are trying to use it to blackmail us into signing up for regulatory alignment ie not leaving the E.U. at all.
Then you can unclench, Masaka. There's nothing in that article to suggest the EU is doing any such thing.
Nor is there any suggestion that the EU will deliberately withhold the vaccine.
As I understand it, there are two issues for the UK.
One is that we have already left the bulk buying and quick approval mechanism, so will have to buy at higher cost, unless for some reason we can strike a similar deal with the pharmaceutical company (they might agree, but why would they? And the haggling itself could take time).
The other is that we are soon to leave the drug-approval mechanism and don't yet have our own mechanism in place. We may not get our own mechanism in place before a vaccine is developed.
At that point, IIUC, we have the following choices:
a) ask doctors to use medicines which haven't been tested or licensed here;
b) not use any new medicines until the bureaucracy has been set up and the medicines tested and licensed;
or the vastly more likely
c) chose to piggyback on another country or bloc's testing and licensing system, and recognise drugs for use here which have been licensed by that system.
We could chose which country/bloc to follow. It's not up to the country/bloc to yay or nay whether we follow them.