Come off it, this is a jingoistic caricature:
Whatever may or may not have gone on, it's not to do with EU civil servants turning up to work unshaven, and still less about the superiority of the English legal tradition.
It's pretty obvious that the UK has out-smarted/out-arseholed (it's as broad as long) the EU wet to AZ procurement. There's no need to recount that. Probably annoying and embarrassing for EU, but it's also a storm in a teacup, because there's neither the UK or the EU are likely to run into a shortage of the vaccine at any point (the difference for EU countries is slower distribution, not supply).
No-one ought to be banning vaccine exports, and for the EU to be talking about it is unnecessary and a (possibly deliberate) distraction.
However, to be crowing about the predictable wickedness and incompetence of the EU's proposed ban on the one hand while, on the other, celebrating the genius of the UK doing it first (which it did - the fact that exports may be allowed a some distant point in the future doesn't make it not a ban) is ridiculous, and it most definitely is buying into a flag-waving narrative.