This is a very narrow view. The U.K. has made sure there are international supply chains to distribute the Oxford vaccine, and far more of that is being supplie

This is a very narrow view. The U.K. has made sure there are international supply chains to distribute the Oxford vaccine, and far more of that is being supplied internationally than the entirety of doses exported from the EU. I think your 50% figure is also too high, though it is a high proportion, but these doses are primarily going to wealthy countries. If the EU were asking for U.K. doses to be routed to other (particularly poorer) countries I would be sympathetic to the position, but this spat is about getting the EU doses, not about equitable access.