 Although generally accepted by the majority of countries in the world, some issuing countries expressly exclude the validity of passports from nations that are not recognized by their governments.Due to the United Kingdom's legacy as an imperial power, British nationality law is unusually complex compared to other countries with multiple classes of nationality.People who resided in British Hong Kong before the Hong Kong Handover in 1997 who registered as a British National (Overseas) are entited to a British National (Overseas) passport which has some restrictions over a regular British Passport issued to British Citizens.