British Citizenship by Naturalisation

British naturalisation as an adult: 12-month post-ILR wait (or 3 years if married to a Brit), good character test, absences limits and citizenship ceremony.

Wesbridge Associates is an IAA-regulated UK immigration law firm. Our advisers support individuals, families and UK sponsors with skilled worker visas, sponsor licences, family routes, settlement (ILR), British citizenship, appeals and compliance — combining experienced legal advice with AI-powered self-service tools.

Reviewed by Wesbridge Associates' IAA-regulated immigration advisers. Last updated: July 2026.

British naturalisation is the process by which an adult foreign national becomes a British citizen. Wesbridge Associates prepares Form AN naturalisation applications and Form MN1 registrations for children — checking the residence and absence rules, the good character requirement, referees and the Life in the UK test — and manages the process through to your citizenship ceremony and British passport application.

Who qualifies

You can apply to naturalise as a British citizen under section 6(1) of the British Nationality Act 1981 if you are 18 or over, of sound mind, of good character, meet English at CEFR B1 and pass the Life in the UK test, and have (a) lived in the UK for at least 5 years, (b) held ILR (or EUSS settled status or Irish citizenship) for at least 12 months before applying, (c) not been absent for more than 450 days in the 5 years and no more than 90 days in the final 12 months, and (d) intend to make the UK your principal home. If you are married to or in a civil partnership with a British citizen (section 6(2)) the residence period is 3 years, you can apply as soon as you hold ILR/settled status with no 12-month wait, and the absence limits are 270 days over 3 years and 90 days in the final year.

Good character requirement

The Home Office assesses good character across criminality (a sentence of 12 months+ is normally a lifetime bar; other sentences and cautions carry sliding time-based bars under Chapter 18, Annex D of the nationality guidance), immigration history (illegal entry, overstaying, deception, working in breach), financial affairs (bankruptcy, unpaid tax, unpaid NHS debts of £500+), notoriety and any deception in the application itself. Even minor issues (fixed penalty notices, drink-driving, undeclared HMRC arrears) must be disclosed — non-disclosure is treated more seriously than the underlying matter.

How it works with Wesbridge

Step 1 — eligibility screening: residence dates, absence log against the 450/90 or 270/90 caps, ILR history, marital status and any good-character issues that need addressing. Step 2 — fixed-fee engagement, Life in the UK evidence, English evidence (if not already relied on at ILR), and two referee statements from qualifying professionals. Step 3 — Form AN drafted online, fee paid (currently £1,630 adults, £1,351 children, including the citizenship ceremony fee), biometrics enrolled at UKVCAS. Step 4 — decision monitoring (standard around 6 months). Step 5 — on approval, we brief you on the citizenship ceremony (must be booked within 90 days) and your first British passport application.

The citizenship ceremony

Once your application is approved you receive an invitation to a citizenship ceremony hosted by your local council, normally within 90 days. At the ceremony you make an Oath of Allegiance (or Affirmation) to the King and a Pledge of loyalty to the UK, receive your Certificate of Naturalisation and become a British citizen from that moment. You can then apply for a British passport and, if you wish and your other nationality permits, retain dual citizenship — the UK does not require you to renounce another nationality.

Frequently asked questions

Do I have to wait 12 months after ILR to apply?

Not always. The 12-month wait applies to the 5-year route under section 6(1). If you are married to or in a civil partnership with a British citizen you can apply under section 6(2) as soon as you have ILR (or EUSS settled status), provided you meet the 3-year residence and other requirements. Irish citizens are treated as settled from the day they take up UK residence.

Will a caution or minor conviction stop me?

It depends on the disposal and how long ago it occurred. Non-custodial sentences carry a 3-year bar from the end of the sentence; custodial sentences under 12 months a 7-year bar; cautions and fixed penalty notices are usually a 3-year concern. Sentences of 12 months or more are normally a lifetime bar. Always disclose — undisclosed matters found on DBS or Home Office checks are treated as deception.

Can I keep my current nationality?

The UK permits dual (and multiple) nationality — becoming British does not require you to give up your existing citizenship. Some countries, however, automatically withdraw citizenship on naturalisation elsewhere or require a formal renunciation. Check with your country of origin's embassy before applying if this matters to you.

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