British Overseas Territories and coat of arms by the British monarch. Traditionally, the flags follow the Blue Ensign design, with the Union Flag in the canton, and the territory's coat of arms in the fly. Exceptions to this are Bermuda which uses a Red Ensign; British Antarctic Territory which uses a White Ensign; British Indian Ocean Territory which uses a Blue Ensign with wavy lines to symbolise the sea; and Gibraltar which uses a banner of its coat of arms (the flag of the city of Gibraltar). Akrotiri and Dhekelia and Saint Helena, Ascension and Tristan da Cunha are the only British overseas
British Overseas Territories Act 2002 of the British Antarctic Territory there are competing territorial claims that are held in abeyance. Although it is not normally possible under either territory's immigration laws to acquire British Overseas Territories citizenship (BOTC) by naturalisation in that territory, the former inhabitants of the BIOT still hold BOTC by virtue of their birth, or a parent's birth, in that territory. Although it was possible for BOTCs to voluntarily acquire British citizenship under the previous provisions of British Nationality Act 1981 through section 4 registration by meeting UK residency and good character requirements prior to 2002, the enactment of the 2002 act