[Quarrel]

> It's not a law in either the US or UK

This changed on Feb 25, 2026 for the UK. :)

UK citizens must now enter on their UK passport (or a citizenship certificate thing + foreign passport), and are not eligible for visa waiver programs (because they're only eligible for people using certain passports, which UK citizens obviously now can't be using).

I was announced in Nov '25, and has cause a mad scramble for lots of people as the passport office has been massively backlogged by the predictable queue of people needing passports suddenly, when they didn't need them before.