Hong Kong–United Kingdom relations a deeply important role in the formation of the modern Hong Kong. Sovereignty of Hong Kong was ceded to the UK "in perpetuity" on 29 August 1842 through the Treaty of Nanking. The UK further expanded the territory of Hong Kong in 1860 by another cessation, plus a 99-year lease of the New Territories in 1898. The stability, security, and predictability of British law and government enabled Hong Kong to flourish as a centre for international trade. Localisation of teritary institutions, the Hong Kong government and the independent Judiciary in the run-up to the 1997 Handover of sovereignty, caused a
British nationality law and Hong Kong Kong began to fear for their future post-1997. Emigration was rampant and a brain-drain was beginning to affect the economy of Hong Kong. To stem the drain, people urged the British government to grant full British citizenship to all Hong Kong BDTCs – but this request was never accepted. However, the British did agree to creating the British Nationality Selection Scheme, which granted to a select 50,000 people and their families the ability to obtain full British citizenship without having to fulfill the ordinary requirements, under the "British Nationality (Hong Kong) Act, 1990". Under the act, the Home Secretary was