British dual nationals might board Ryanair flights to the UK using documents other than a current British passport when new rules start on 25 February. Ryanair said it will accept alternative proof of British nationality, like an old passport or a certificate of entitlement. These new Home Office rules say dual nationals must show a valid British passport or an electronic travel authorisation (ETA) to fly to the UK. Many living in Europe worried about these changes, especially those whose children born abroad lack British passports. Ryanair stated, "Yes, we will allow a passenger to board a flight to the UK if we are satisfied that the passenger is a British national, an Irish national or is in possession of any other status in the UK, including passengers who hold an old stamp/vignette with indefinite leave to remain." They added that "a valid or expired British passport" and a certificate of entitlement are acceptable. From 25 February, airlines must check if passengers eligible for an ETA have one. If not, they will check for other documents proving UK entry rights. However, the exact types of accepted documents are unclear. Airlines face fines if passengers do not have the right to enter the UK. The Home Office warned passengers without a British passport or certificate of entitlement might be refused boarding. According to the Home Office, all dual British citizens must show valid British proof or a certificate of entitlement for entry from 25 February 2026. A Commons briefing paper states British citizens cannot be refused entry but must prove their right to enter. One man from Canada, worried he might miss his dying brother’s birthday, moved his flight earlier due to the new rules. He called the new rules "completely absurd." The Home Office declined to comment.