Form B(OS): guidance
Guidance to register as a British citizen if you have certain other types of British nationality.
- From:
- UK Visas and Immigration
- Published
- 22 March 2019
- Last updated
-
4
22OctoberFebruary20232022— See all updates
Documents

Form B(OS): guidance
PDF, 183477 KB, 1410 pages
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Details
Read the B(OS) guidance to find out if you can register as a British citizen if you are a British Overseas citizen, British subject, British protected person, or British National (Overseas) and have no other citizenship or nationality.
Last updated 4
-
Document format and style updated. Outdated information removed or updated accordingly. References and links to fees updated.
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Accessible HTML version added.
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First published.
Update history
2025-04-22 10:26
Updated information about biometric enrolment, citizenship ceremonies and citizenship-related queries and added a new section about digital status.
2024-07-24 01:00
Added a section on application processing times, and added more details to the section on travelling to and from the UK after registering.
2023-10-04 00:01
Document format and style updated. Outdated information removed or updated accordingly. References and links to fees updated.
2022-02-22 09:22
Accessible HTML version added.