Travelling on your foreign passport after naturalisation: the ETA rule that catches new British citizens
Since 25 February 2026, a British citizen cannot travel to the UK on a foreign passport alone. British and Irish citizens, including dual nationals, are not eligible for an Electronic Travel Authorisation (ETA), and carriers now check every passenger's permission to travel before boarding. To fly back to the UK, a British dual national needs either a valid British passport or another passport containing a certificate of entitlement to the right of abode (£589). This bites hardest in the weeks right after your citizenship ceremony, when you are legally British but your first British passport has not arrived yet.
- ETA enforcement began on 25 February 2026, and carriers check permission to travel before boarding
- British citizens, including dual nationals, cannot get an ETA on their foreign passport
- Accepted documents: a valid British passport, or a foreign passport with a certificate of entitlement
- A certificate of entitlement costs £589, with decisions usually in 8 weeks (in the UK) or 3 weeks (abroad)
- A first adult British passport costs £102 online and usually takes about 3 weeks, longer if an interview is needed
- Your eVisa route ends when you naturalise, because your previous immigration status no longer applies
What changed on 25 February 2026
The UK's ETA scheme moved to full enforcement on 25 February 2026. From that date, non-visa nationals need digital permission to travel to the UK, and carriers verify it before departure. GOV.UK is explicit that if you are a dual citizen with British or Irish citizenship, you cannot get an ETA. Instead, you must prove your citizenship when travelling with a valid British passport, a valid Irish passport, or another valid passport containing a certificate of entitlement proving your right of abode.
The government's own advice warns dual British citizens to hold one of those documents "to avoid problems like being denied boarding when travelling to the UK from 25 February 2026". In practice, an airline that cannot verify your permission to travel on your foreign passport can refuse to let you board.
Why newly naturalised citizens get caught in the gap
The moment you take the oath at your ceremony, you are a British citizen. That has two immediate consequences for travel:
- You are no longer eligible for an ETA, because British citizens cannot hold one
- Your previous status ends, so your eVisa or old BRP no longer reflects how you enter the UK
But you do not receive a British passport at the ceremony. You receive a certificate of naturalisation, which is not a travel document. You then apply for your first adult British passport, which costs £102 online and usually arrives within about 3 weeks, though HM Passport Office says it can take longer if they need more information or need to interview you, which is common for first-time applicants.
That leaves a window of several weeks in which you hold only your foreign passport, cannot get an ETA on it, and have no British passport to show a carrier. If you have a return flight booked in that window, you have a problem.
Do not book travel that requires you to re-enter the UK between your citizenship ceremony and receiving your first British passport. Once you naturalise, your foreign passport alone will not get you on a flight to the UK, and airlines apply the rule at check-in, not at the border.
The certificate of entitlement alternative
If you genuinely need to keep travelling on your foreign passport, the official alternative is a certificate of entitlement to the right of abode. It is placed in (or linked to) your foreign passport and proves your right to live in the UK. Key facts, verified on GOV.UK:
- It costs £589 to apply
- Applying inside the UK, a decision usually takes 8 weeks
- Applying outside the UK, a decision usually takes about 3 weeks after your appointment at a visa application centre
For most new citizens this makes little sense: it costs more than five times the £102 passport fee and, from inside the UK, takes longer than the passport itself. It is mainly useful for people who must travel frequently on a foreign passport for work, or whose other nationality restricts holding a second passport.
GOV.UK says carriers may accept an expired UK passport issued in 1989 or later alongside a valid passport from an ETA-eligible country, at the carrier's discretion. That only helps people who have previously held a British passport, not first-time citizens.
Practical sequencing for new citizens
- Before the ceremony, check your calendar. If you have unavoidable travel, consider attending the ceremony after the trip, within the deadline on your invitation.
- Apply for your British passport promptly after the ceremony, online, with your certificate of naturalisation. Budget for 3 weeks minimum and do not book non-refundable travel against it.
- If you are abroad when you naturalise (for example after a consular ceremony), take advice before flying. Your options are applying for your first British passport from overseas or a certificate of entitlement at a visa application centre, which usually takes about 3 weeks. GOV.UK's emergency travel document route is described for people who previously held a UK passport, so do not assume it covers you.
- Keep your foreign passport valid. You will still use it to enter countries where you hold that nationality.
Once your British passport arrives, this problem disappears for good. It is one of the practical points worth ticking off in our new citizen checklist, alongside registering to vote and updating your records.