UK Dual National Passport Rules Explained (2026 Update)

From 25 February 2026, the United Kingdom has introduced significant changes to the documentation required for British citizens who also hold a second nationality (dual nationals) — and these changes have caused widespread confusion, criticism, and practical challenges for families, travellers and legal practitioners alike.

What’s Changing? Mandatory British Passport or Certificate of Entitlement

Under the new regime tied to the rollout of the Electronic Travel Authorisation (“ETA”) system, all travellers to the UK must have valid permission to travel confirmed before departure. Previously, many dual British nationals could board flights to the UK using only their foreign passport (for example, a US or Australian passport), particularly if they were from a visa-free country. From 25 February, this option is no longer viable:

• Dual British nationals must enter the UK using a valid British passport; or
• They must have a digital “Certificate of Entitlement” in their non-UK passport to demonstrate the right of abode.

For those without a British passport, a Certificate of Entitlement can be applied for, but this comes with a substantially higher fee (approximately £589) compared with a British passport renewal — which currently costs under £100.

Why This Matters: Travel Impact & Airline Enforcement

The immediate consequence of the new rules is practical: airlines, ferries and train operators are instructed to check that passengers have the correct documentation before allowing them to board. Dual nationals who try to board with only a non-British passport and no Certificate of Entitlement could be refused boarding at the gate.

The Home Office and carriers now use a pre-departure system that electronically verifies travel permissions. Because dual nationals are exempt from needing a standard ETA but are not eligible to obtain one on their foreign passport, relying on that passport alone is no longer sufficient for travel to the UK.

Emergency and Transitional Arrangements — Limited and Uncertain

Recognising widespread confusion, the Home Office has provided some limited temporary guidance:

• Expired British passports (issued from 1989 onwards) may, at the discretion of airlines, be accepted as evidence of citizenship when paired with a valid foreign passport eligible for an ETA.
• Emergency Travel Documents (ETDs) may be issued in exceptional cases for those who urgently need to travel.

However, these measures are not guaranteed and hinge largely on carrier discretion — unlike a British passport or Certificate of Entitlement, which are clearly prescribed under the rules.

Home Office Rationale: Modernising Border Control

According to official guidance, the changes are part of the UK’s wider shift to digitised border management. The ETA system — similar in principle to the US ESTA or Canada’s eTA — was designed to ensure that airlines submit passenger data in advance, and that travellers’ status can be confirmed electronically before departure.

This system improves the ability to distinguish British citizens from foreign visitors who require visas or ETAs — an issue that has historically arisen when dual nationals board using a non-UK passport, which can result in them being logged as foreign travellers.

Criticism and Controversy: Cost, Communication, and Rights Concerns

The policy has attracted significant public backlash:

• Some British dual nationals claim the changes were poorly communicated and that they were caught unaware despite long-standing travel habits abroad.
• Critics argue the system creates an unjust financial burden, particularly the high cost of a Certificate of Entitlement compared to a standard passport.
• Many commentators and campaign groups maintain that the changes effectively make some dual nationals feel like “second-class citizens,” especially where they have lived abroad for decades without a British passport.
• Practical issues — such as children born overseas who hold dual nationality but have never possessed a British passport — have also been highlighted.

There have also been calls from political groups such as the Liberal Democrats for the UK government to introduce a transitional period or lower-cost alternative to alleviate the disruption for affected citizens.

Common Questions Dual Nationals Are Asking

Can a dual national enter the UK on a foreign passport with an existing ETA?

Although some individuals hold valid ETAs linked to their foreign passport from earlier in the rollout, the official position is shifting, and new applications for ETAs by British nationals are effectively blocked on the online systems as the document has become unavailable for dual nationals.

Are dual nationals being “banned” from entering the UK?

Legally, British citizens — including those with dual nationality — retain the right to enter the UK. The practical effect of the new rules, however, is that airlines and carriers are tasked with enforcing documentation requirements, and without the specified documents travellers may be denied boarding.

Is there any legal requirement to travel on a British passport?

There is no statutory obligation that everyone must use a British passport to return to the UK; the legal requirement is to be able to prove the right of abode. Evidence of this right, in practice at the border, can only be through a British passport or Certificate of Entitlement.