https://www.gov.uk/guidance/hong-kong-british-national-overseas-visa-applications#settlement-and-citizenship
You’ll be able to apply to settle in the UK (also called ‘indefinite leave to remain’) once you’ve lived here for 5 years. If you’ve already spent time in the UK on a route to settlement (for example, a general work (Tier 2) visa), this time will count towards the 5 years.
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