Mr.M Stapley, you can go to China on a tourist visa to find a job, if your employer is reputable and powerful, then he can help you to apply for a work visa within China, such as you go to a famous university or high school to teach English. If you go to a small private traning center to teach English, then you have to exit China to apply for Z visa, then re-enter China on a Z VISA.

if the UK company your work for has a branch in China, the invitation letter from the branch of the Uk company cna help you to apply for business visa.