Good question! Post-Brexit, UK residents now carry a GHIC (Global Health Insurance Card). It’s the same idea, minus the EU flag. Confusing? Yes. Effective? Also yes. Just check which one you need. The process is identical—apply online, get a card, avoid getting a sunburn in Portugal.
For EU citizens: nothing changed. Your EHIC still works in the EU, plus Norway, Iceland, Liechtenstein, and Switzerland. You can still get treatment for a broken leg in Spain or a wicked ear infection in Poland. Solidarity, baby.