The UK’s Electronic Travel Authorisation (ETA) scheme was introduced in October 2023 as a new pre-travel requirement for non-visa nationals visiting the UK for short stays of up to six months. The implementation period (which allowed flexibility to enter for those that didn’t get an ETA pre-travel) ends on 25 February 2026, therefore travellers who require an ETA will no longer be permitted to travel without one.
While the ETA is aimed at non-visa nationals, its mandatory enforcement creates a hidden and often overlooked risk for British citizens who do not hold a British passport. Although British citizens are formally exempt from the ETA requirement, the way the system is enforced in practice creates significant compliance issues – particularly for dual nationals and British citizens resident overseas who travel on foreign passports. They are increasingly expected to prove their exemption before travel, rather than relying on recognition at the UK border.
Why ETA Changes the Practical Reality
The ETA operates as a carrier-enforced, pre-departure system. Airlines, ferry operators and rail carriers must verify that passengers have the correct authority to travel before boarding. This creates a problem for British citizens travelling on non-British passports. British citizens cannot apply for an ETA (this is expressly stated on the forms), and carriers are not equipped or required to assess claims of British citizenship without a passport.
As a result, from 25 February 2026, dual nationals (including those holding British or Irish citizenship alongside other nationalities) will be able to travel to the UK only if they hold one of the following:
- a valid British passport;
- a valid Irish passport; or
- a valid foreign passport endorsed with a Certificate of Entitlement to the Right of Abode (“ROA”).
British citizens living abroad who do not hold a valid British passport therefore may face denied boarding, regardless of their underlying ROA. It is clear that the system prioritises documentary proof over legal status, leaving little room for discretion.
Certificates of Entitlement: A Limited Alternative
The Home Office position is that British citizens travelling on foreign passports should hold either a valid British passport or a Certificate of Entitlement to the ROA.
From 26 February 2026, Certificates of Entitlement will be issued in digital form and linked to a UKVI account. This means holders will no longer need to reapply when their passport expires and can instead update passport details online.
While this improves accessibility and reduces repeat application costs, it also introduces new risks such as costs (a ROA application costs £589), application delays, challenges for older or complex nationality cases, and reliance on accurate digital linking. In practice, the Certificate functions as a passport substitute, reinforcing the Home Office’s expectation that British status must be evidenced through formal documentation.
Legal and Policy Implications of ETA Enforcement
ETA enforcement reflects a broader policy shift away from discretionary decision-making by the UK Border Force towards carrier-led, automated eligibility checks. While there is no legal change to British citizenship itself, the operational reality is that travelling without British documentation is no longer realistic. This raises concerns around proportionality and accessibility, particularly for British citizens who have lived abroad for long periods and have limited engagement with the UK passport system.
Practical Advice for Individuals and Employers
Ahead of 25 February 2026, British citizens travelling to the UK should ensure they hold a valid British passport or obtain and properly link a digital Certificate of Entitlement well in advance of travel. A severe alternative is to renounce their British citizenship (through an application online) however advice should be taken before doing so.
Conclusion
The mandatory enforcement of the ETA scheme does not alter the legal status of British citizens. However, it fundamentally changes how British citizenship must be evidenced in practice. For British citizens without British passports, ETA enforcement transforms documentation from a convenience into a necessity, as it is much harder for them to prove their entitlement at the border.
From an immigration law perspective, this marks a decisive move toward document-based mobility, with significant practical consequences for dual nationals and overseas British citizens navigating the UK’s evolving digital border system.
