Posts on British National (Overseas) status may be found here.

British National (Overseas) status is a class of British nationality created by the Hong Kong Act 1985 and the Hong Kong (British Nationality) Order 1986, to cater for British nationals who derived such status by virtue of a connection with Hong Kong. Its creation formed part of the arrangements for the return of Hong Kong to China.

It does not carry the right of abode in the United Kingdom.

British National (Overseas) status is a legal attachment or bond for persons considered by the UK to be British nationals, albeit that they may not live and work in the UK free of immigration controls by virtue of that status.

British Nationals (Overseas) are not considered to be UK nationals for the purposes of EU law and such persons do not hold the additional status of EU citizen.

British National (Overseas) status is not intended to have any modes of acquisition after 1997. With one almost redundant exception, it does not transmit (automatically or on application for naturalisation or registration) by birth in Hong Kong or by descent.  There is no provision for naturalisation as a British National (Overseas).

British National (Overseas) status has modes of loss. For example it may be renounced, or it may lost through deprivation of citizenship on grounds of fraud or conduct.

Posts on British  National (Overseas) status may be found here.