What to know about British passport dual citizenship

Introduction — why British passport dual citizenship matters

Holding a British passport alongside another nationality affects travel, legal rights and everyday obligations. For migrants, families and frequent travellers, clarity about dual citizenship is important for planning residency, taxes, consular support and compliance with the laws of both countries.

Main details — rights, rules and practical effects

Permission to hold more than one nationality

The United Kingdom permits its citizens to hold more than one nationality. That means a British passport can be held at the same time as citizenship of another country where that second country also allows dual nationality. Whether you may keep or acquire both nationalities depends on the laws of the other country involved.

Using passports and travel

Dual nationals should be aware that countries often require their own citizens to enter and leave using that country’s passport. When travelling, it is important to use the correct document to avoid immigration delays. A British passport remains the primary document for UK consular services when abroad, but the practicalities of crossing borders will depend on the other nationality.

Consular assistance and legal status

Consular help from the UK can be limited if you are in the country of your other nationality, because that country may treat you only as its citizen. Dual status can also affect access to public services, voting rights and eligibility for certain jobs, which vary by jurisdiction.

Administrative requirements

You must be a British citizen to apply for a British passport. Applications require proof of identity and citizenship (for example, a birth or naturalisation certificate), and the process is handled by HM Passport Office. Holders should keep documentation up to date and follow renewal rules.

Conclusion — implications for readers

British passport dual citizenship offers flexibility but brings responsibilities. Before acquiring or using a second nationality, check legal, tax and military obligations in both countries and confirm entry/exit rules. For many people it provides greater mobility and family connection; for others it requires careful management of competing legal requirements. Seek official guidance when in doubt to ensure smooth travel and compliance.