True - and I gather also that the EU part-funded the programme to establish capacity to manufacture the AZ vaccine in the UK.
You could, of course, argue it the other way around - in other words that the UK was happy to take Pfizer and AZ vaccines from the EU when the UK vaccine manufacturing capacity was unable to meet demand, however aren't willing to allow AZ vaccines produced in the UK to be shipped to the EU when they are struggling to meet current demand. Either way it is pretty unseemly and I doubt that contracts placed by either EU or UK for either vaccine had stipulations as to their origin of manufacture.
Perhaps so.
However I think the key point here is that it would appear that AZ are unable currently to meet their contractual agreements for supply of their vaccine to both UK and EU. So what to do - I think in the short term the fairest option is to ensure that both the EU and the UK are impacted proportionally. But of course the only long term solution is to increase capacity to meet the contractual obligations with both the UK and EU.
All of this is just hypothesis unless you have sight of the relevant contracts.
If the EU contract says "vaccine to be supplied from the plants in Belgium and the Netherlands" then the EU doesn't have a leg to stand on in this dispute. If, on the other hand, the British plant is included in the contract, then AstraZenica can't just say "sorry EU", they must make a commercial decision about how to resolve the issue. It's likely that both their UK and EU contracts have penalty clauses which come into effect in the event of failure to commit to delivering contracted vaccines. So those will inform AstraZenica's decision.
https://www.bbc.co.uk/news/world-europe-55852698The CEO of AstraZenica said that:
the contract stipulated that the company would make its "best effort" to meet the EU demand and did not compel the company to stick to a specific timetable - an assertion disputed by the EU.
If he is right and if the British contract does stipulate a timetable, the UK must get priority.
It's a horrible mess because, in a ideal world, we would all be sat round a table discussing how to resolve the shortage in a way that is fair to everybody, but political squabbles are clearly getting in the way.
Note that, until today, the EU couldn't do anything with the AstraZenica vaccine because, only today will it be approved in the EU.