Most of the countries in the EU are in the Eurozone too. The UK is pretty much the last major economy in the EU that's outside the Eurozone, and one of only two

Most of the countries in the EU are in the Eurozone too. The UK is pretty much the last major economy in the EU that's outside the Eurozone, and one of only two EU members that are not in theory obliged to join it as soon as they're able to.