Form UKF: guidance
Guidance to register as a British citizen if you were born to a British father and your parents were not married.
Documents
Details
Read the UKF guidance to find out if you can register as a British citizen if you would have become a British citizen automatically if your parents had been married.
Updates to this page
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Updated guidance to clarify: references to the applicant and deprivation of citizenship; registration under the BOTC(F) route; how someone became a British citizen; the definition of parents for nationality purposes; evidence of paternity; and application refusal due to not attending a ceremony within 90 days.
Update history
2026-03-05 14:46
Updated the section ‘Travelling to and from the UK after becoming a British citizen’.
2025-07-21 12:25
Updated guidance to clarify: references to the applicant and deprivation of citizenship; registration under the BOTC(F) route; how someone became a British citizen; the definition of parents for nationality purposes; evidence of paternity; and application refusal due to not attending a ceremony within 90 days.
2025-04-16 11:06
Updated information on citizenship queries and ceremonies, the Immigration Advice Authority and added a new section on ‘Next steps’.
2024-10-07 15:18
Page summary amended to reflect the fact that form UKF can now be used by both people born before and after 1 July 2006.
2024-07-23 16:01
Updates to fees links and travel advice after becoming British.
2023-10-04 00:01
Document format and style updated. Outdated information removed or updated accordingly. References and links to fees updated.
2023-01-03 15:41
Updated the guidance.