A new EU Entry/Exit System is in effect as of October 12, introducing new travel rules for Brits.
The EU Entry/Exit system (EES) requires UK passport holders to register their biometric details, such as fingerprints and a photo, upon arrival for short stays.
This process is free and does not require prior registration.
No prior action is needed, and it is a free process.
The following countries are affected by the new EU travel rules, but the list of countries is not provided in the given text.
Author's summary: New EU travel rules affect UK passport holders.