好,搵到,係呢份先啱
If you are a British Overseas Territories citizen, British Overseas citizen, a British subject under section 31 of the British Nationality Act 1981 or a British National (Overseas), registration as a British citizen will not cause you to lose that status. However, British Overseas Territories citizens may find their immigration status could be affected in the territory concerned and they should address any questions about this to the Governor.
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/788221/Guide_B_OTA_.pdf