So unless I’m misunderstanding the UK-Australia AIP, it’s not actually duty and quota free. Long-grained milled rice being the last bastion of protectionism:
A related story: When Raab banned UK officials from attending EU meetings in the run up to Brexit, Scottish officials kept going to some anyway.
On the UK presenting a united front thing, another related story: I remember witnessing a load of ERG MPs turn up in Warsaw in a last ditch attempt to convince the Polish government to veto any UK request to extend article 50.
Imports of food under an Australia-UK trade agreement wouldn’t qualify for tariff-free trade into Northern Ireland (until maybe EU also has an FTA) because the tariff differential between the EU and UK tariff will be > 3%.
As in, irrespective of the rights and wrongs of IP rules, if you want to vaccinate the whole world as quickly as possible the fastest way to do it is surely to pay the pharma companies ££££££ to license their vaccines and technologies to everyone else.
But if you want to pay pharma less/ make them share technology they don’t want to share, the threat of a covid vaccine waiver could give you additional leverage.