I'm Thai living in UK, Do I need to apply for visa to China, my husband is British

Hi
we plan to go VN, HK and CN to see the Canton Fair.
I got both Thai and British Passport, can I use Thai passport to apply the entry permit and how much is the application fee.
and how much for British passport to make the application. ( I already booked the flight from CN to TH under my married name, is it effect to application approval or not
please suggest the best way to do. Thank you very much.