Hong kong passport. I want to apply for my hong kong passport which is due to expire in sept 5

and i am not able to travel to hong kong during this period, i wanted to know if i can submit the application in uk , if so how and where, what forms do i need to fill up, do i need to give any extra documents for this, do i need to pay the fee at the counter in uk or do i need pay it online directly to hk immigration. i have asked my colleagues but no body was able to guide me the right direction, if some can really help to send me the advise how to go about it will very thankful