EU tourists will need an Electronic Travel Authorisation (ETA) to travel to the UK from April 2, 2025. Citizens from many other countries need it as from January 8, 2025.
EU citizens also need a passport to enter the UK since October 1, 2021. Before this date, EU citizens could enter the UK with a national identity card. However, after Brexit, the UK changed its entry requirements, and an ID card is no longer sufficient for most EU citizens.
Now an ETA will become an extra requirement. It will cost £10 (€12) and will be valid for two years, or until the expiration date of the passport.