British dual nationals travelling to theUnited Kingdommay face stricter documentation requirements from 25 February 2026, as the government moves into the full enforcement phase of its Electronic Travel Authorisation (ETA) system.

Under the updated procedures,British citizens holding dual nationalityare expected to present a valid British passport when entering the country. Travellers attempting to rely solely on a foreign passport risk delays at check-in or additional scrutiny at the border.

The changes have prompted increased enquiries from British citizens living abroad, particularly among those who have historically travelled using non-British passports.

Under the ETA scheme, eligible foreign nationals must obtain digital travel authorisation before entering the UK. British and Irish citizens, including dual nationals, are exempt from this requirement.

However, exemption from ETA does not remove the need to demonstrate the right to enter the country.Home Office guidancestates that British citizens are expected to travel using a valid British passport.

If you’re a dual national holding British citizenship, this is for you ⬇️In the UKVI’s process of digitising their immigration system, dual nationals holding British citizenship must either obtain a valid British passport or a certificate of entitlement to right of abode (CoE)…pic.twitter.com/V4d6w4e8Ke

Officials warn that dual nationals attempting to enter the UK using only a foreign passport may face complications. While entry cannot legally be refused to a British citizen, travellers may be subject to additional checks to verify their status.

In practice, carriers may also deny boarding where passengers are unable to present documentation clearly confirming their right of entry.

The right of abode permits individuals to live and enter the UK without immigration control. British citizens automatically hold this status when travelling on a British passport.

Dual nationals without a valid British passport may instead apply for aCertificate of Entitlement to the Right of Abode. The application process involves identity verification, administrative checks and a £589 fee. Processing times can vary depending on location and demand.

Source: International Business Times UK