The problem with that is that in reality, there's very little the UK can do to supply the EU with a meaningful number of vaccines. You've got to remember that the UK has less than a sixth the population of the EU and doesn't have much local pharmaceutical manufacturing. What Covid-19 vaccine manufacturing we do have only has enough capacity to supply part of the UK demand as, basically, a back-up plan in case everyone goes vaccine nationalist and bans exports.
Any real solution to the EU's vaccination problem basically has to involve fixing their vaccine supply chains, not getting magical extra vaccines from somewhere else because there is no supply of vaccines from elsewhere that could fill their gaps. All the rabble-rousing about UK-made vaccines from the European Commission and the rest of the EU is just an attempt to distract from that because the actual cause is really politically inconvenient for the people trying to blame the UK.
Any real solution to the EU's vaccination problem basically has to involve fixing their vaccine supply chains, not getting magical extra vaccines from somewhere else because there is no supply of vaccines from elsewhere that could fill their gaps. All the rabble-rousing about UK-made vaccines from the European Commission and the rest of the EU is just an attempt to distract from that because the actual cause is really politically inconvenient for the people trying to blame the UK.