Yes, you absolutely need a valid passport to travel from the UK to Switzerland in 2026. Following the full implementation of the Entry/Exit System (EES) in April 2026, British citizens must provide biometric data (fingerprints and a facial image) upon their first entry into the Schengen Area, which includes Switzerland. Furthermore, by late 2026, the ETIAS (European Travel Information and Authorisation System) will require UK travelers to apply for an online authorization and pay a small fee (approximately €7) before departure. Your passport must be less than 10 years old on the day you enter and remain valid for at least three months after the day you plan to leave. While the UK is not in the EU, Switzerland's membership in the Schengen Zone means these standardized security protocols are strictly enforced at all border points, whether you arrive by air from London or by rail via France.