Great- thanks for the help and quick responses.
Yes- 20. :-)
No to (f) as you were very probably had the right of abode in the United Kingdom before July 1st 1997 if you were born in HK with a British citizen parent.
"I have technical qualifications in my field of work."
Maybe, but may also be considered not have enough years of expeirence if you were born in the mid 1990s.
You were probably not eligible for BDTC or BN(O) in 1997 as your parent were not permanent resident of HK before the handover. All BDTC of HK and BN(O) had the right of abode in British HK.
Having British citrizenship is no different from having Australian citizenship in this case. But HK does still welcome people from developed countries more than developing countries after the handover. However, for example if you study medicine in the UK or Australia, you will be required to take the extremely difficult LMCHK examination. Most commonwalth medicine graduates were waived to take the LMCHK before the handover.