Overview
- From February 25, carriers must confirm passengers’ permission to travel, and dual British citizens will be boarded only with a valid UK passport or a £589 Certificate of Entitlement.
- British citizens with dual nationality cannot use an ETA, which becomes mandatory for most visa‑exempt visitors after the transition period.
- Temporary guidance allows airlines to accept certain expired UK passports, typically those issued from 1989 onward, when shown with a valid foreign passport, but this is not guaranteed.
- Airlines bear liability for improper checks and warn travellers to verify documents, as agents report confusion, cancellations and calls for a formal grace period.
- Roughly 1.1–1.2 million people could be affected globally, and those who previously held a UK passport may apply for an emergency travel document if urgent travel is needed.