You need to send additional documents in the following cases.
Title on your passport
You can include:
professional titles - for example, doctor, judge, minister of religion, professor, QC, or JP if you’re a magistrate
honours or military decorations
You’ll need to send a document or letter that gives details of the title.
Your title will be on the ‘observations’ page of your passport - it will not be part of your name, except if it’s a title of nobility, for example knight, dame or a lord.
British National Overseas (BNO)
If you’re renewing your British National Overseas (BNO) passport send the following:
a colour copy of both sides of your Hong Kong permanent identity card