[makomk]

The two different vaccines the UK has administered had different contractual and manufacturing arrangements - the AstraZeneca/Oxford vaccine has separate manufacturing facilities for the UK and the EU, with each being contractually tied to the supply of vaccines for that area, whereas the Pfizer/BioNTech one both contracted for supply for the same manufacturing facility. As I understand it, the UK wanted at least one locally manufactured vaccine as a precaution in case Trump went and banned exports (and I suspect the EU also wanted theirs manufactured locally for the usual reasons).