VisaBIOT Chagossian citizenship applicants need to check the 2027 deadline and family evidence
Current Home Office guidance distinguishes direct-descent registration, younger applicants’ deadlines, biometric steps and separate immigration permission for accompanying relatives.
Official source date: 2026-07-20
Edited and checked by the VisaWand editorial team
Identify the deadline that applies to the applicant’s age
Direct descendants of people born in the British Indian Ocean Territory should check which deadline applies before preparing a British citizenship application. The official application page gives 23 November 2027 for applicants who were already eighteen on 23 November 2022. Younger applicants have a different deadline linked to their twenty-third birthday. This is a current follow-up on the route launched in 2022, not a newly introduced November nationality scheme.
The application page says direct descent includes children, grandchildren and later generations, but not descent through an aunt, uncle, sibling or cousin. It provides the online application and identifies the route as free to apply. Applicants must establish which citizenship status they already hold and which they seek; a person who already holds one status should not assume they need to apply for it again. Use this page to begin the appropriate individual application, rather than submitting one form as though it registers an entire household.
Build an unbroken family record and explain missing papers
The Home Office’s caseworker guidance describes evidence linking the applicant through successive generations to the ancestor born in BIOT. Full birth certificates identifying parents are particularly relevant. It also tells decision-makers to consider other independent evidence where standard records are unavailable, including marriage, medical, dental and court records. Use that guidance to understand the family connection that must be shown; sharing a surname is not the same as documenting each link.
An illustrative grandchild should identify the ancestor’s place of birth, the intervening parent and the applicant’s own relationship to that parent. Where marriage or a change of name explains different surnames, include the relevant evidence and explanation. The guidance does not require parents to have been married for a claim, although paternity must be established where relevant. Missing documents should be described honestly, with available supporting evidence, rather than replaced by an invented record or an unsupported statement of eligibility.
Plan biometrics and lawful status while the case is pending
The applicant guide updated on 20 July 2026 says biometric enrolment will usually need to take place within forty-five days of submission, following Home Office instructions. Failure to complete that step can invalidate the application. It distinguishes document handling for applicants abroad, who should not post their supporting originals to the UK, from the arrangements for UK-based applicants. Use that guide before deciding when to submit or send a passport.
The guide also says applicants in the UK must maintain valid permission while awaiting a decision; applying for nationality does not itself establish leave to remain. Successful applicants generally need to complete the required oath, pledge or citizenship ceremony, with the stated ninety-day period for arranging attendance after approval. A registration certificate cannot be used as a travel document: after becoming British, arrange a passport or the appropriate entitlement evidence before travel. These stages should be included in the plan rather than treating an approval message as a completed journey document.
Check each accompanying relative’s own immigration position
The government’s Chagossian British-citizen information pack says spouses and other relatives outside the direct-descent route need their own appropriate immigration permission to live in the UK. A citizen’s successful registration therefore does not automatically admit a partner or every family member. Use that pack before relocating, checking the documents of each person travelling rather than expecting eligibility to be decided favourably at the arrival desk.
The separate citizenship-rights update explains that the UK–Mauritius treaty’s entry into force affects future BIOT-linked overseas-territories nationality, while preserving the specified British citizenship route. It distinguishes existing status from new applications and future children’s claims. Applicants affected by that transition should read the update and obtain clarification for their existing nationality and application date. The reviewed application guidance does not justify assuming that British citizenship, BOTC status and family immigration permission all follow identical rules or deadlines.
