If your partner is your legally married wife, you can get a dependent visa.
If you can find a job that will sponsor you, you can get an employment visa.
With a British passport, you can come as a visitor for 180 days, and probably swing at least one "visa run" to renew it.
What you cannot get is a dependent visa if you are not married to your partner.... in which case most of the folks on here will just jump in and tell you to get married .
Best bet is probably a long term visitor while looking for a job (I should add this is technically illegal but if you are white nobody seems to care). If you fancy teaching english, you can get some training and try for a (low paid if no experience) job just to get the visa. Or look for a job in your own field but I guess HR might need Cantonese ? As everywhere, jobs are not falling off trees right now.