The EU were slow to place orders, and are being slow to approve usage. They're comparing poorly to other places with their electorates, and need to find a way to look like they're doing something. That means they're throwing their weight around.And do we believe that EU countries (and come to think of it, any other countries with vaccine production facilities) haven't inserted "nationalistic" clauses in their contracts ? It's notable that Pfizer has also had production problems, yet these don't seem to have attracted so much political attention.
Arguably the whole point of having on-shore production is to have some element of supply chain assurance, and this situation hasn't been been caused by the UK not pulling its weight, these are the continents facilities that aren't up to speed.
Yes, we should assist our neighbours - particularly once our vulnerable have been vaccinated -(which would be assisted by not persisting with a stupid lockdown strategy) however we should resist any narrative that we have taken an unduly nationalistic position. Afterall, was Germany being nationalistic last year when it had all of the testing capacity ?
There are various extracts of the contract circulating online, and like any large commercial contract I've ever seen, the extracts make little sense in isolation and are correspondingly hard to interpret. The little I've seen suggests that the balance is in favour of AZ, but that in reality the EU and AZ have a choice of either getting into a fight where both will lose, or starting to act like grown ups to see how the situation can be improved.