"Between the UK and EU, only one of them is actively stopping the vaccines from being shipped out with political interference, and it's not us, we only want what we paid and signed for."
Sounds like you don't realize how incompetent German politicians are. This vaccination thing isn't unlike the NATO issue where Trump demanded that Germany reserves 2% of its own GDP for spending on military after Germany had hovered just above 1% for the longest time. This was portrayed as Trump pushing for his "America First" agenda, but the actual NATO terms are that each member state spends 2% of its respective GDP, so in reality Germany was getting by cheap and the actual culprit in the issue.
Regarding vaccination, it's really as simple as LurkerJ says: If there was actual foul play, the EU would threaten to go to court instead of making hollow statements to create a narrative where the blame lies somewhere else instead of with the EU's shopping strategy for vaccines.
On a sidenote, when I heard the news that the USA has decided to vaccinate its own people first before they export vaccines, I shook my head in disbelief. Not because the USA prioritizes their own people, but because it was reported in a way as if that was a dishonorable thing to do.