https://www.gov.uk/bno-passports/hong-kong
Hong Kong
Your application will take at least 4 weeks. Don’t book any travel until you’ve received your new passport.
Download the application form and guidance notes. Using the ‘Smart application form’ can help reduce errors on your application.
Include 2 identical new photos of you. Follow the rules about passport photos or your application may be delayed.
Include your current or previous British National (Overseas) passport and a copy of your Hong Kong Permanent Identity Card. If you’ve lost your identity card, you must send both a personal identification form (PDF, 64KB) and original proof of identity (eg driving licence, utility bill, bank statement).
Send your application to:
British Consulate-General
RPPC - 5th Floor
1 Supreme Court Road
Hong Kong