stilton
Before 1997 British Citizens had the "Right to Land" in Hong Kong. There was no procedure to apply for citizenship. After 1997 the concept of Permanent Residence was introduced. If you lived continuously in HK for a period of 7 years you could apply. Unless you were born in Hong Kong, you lose it again if you have not returned for more than two years. People born in Hong Kong of Chinese descent are entitled to Chinese citizenship. You can otherwise only get this citizenship by naturalisation and you must give up your other nationalities.