You have two related but separate issues here to deal with: marriage to a Chinese national and, then, subsequent immigration to the UK. I can help you with the first but not the second issue.
We have a fairly extensive chapter on Getting Married in China
. It will be a relatively straightforward (albeit a bureaucratically annoying) matter whether you choose to get married in mainland China where the girl’s residency (hukou) is registered, or in Hong Kong. However, since your plans are to bring your new bride to the UK, this can complicate matters somewhat.
There was a time in the United States when the waiting period for fiancée visas was considerably shorter than for spousal visas. You need to check with an immigration attorney in England to determine the quickest, if not easiest, strategy for bringing your future wife over to the UK. You might be advised to marry in the UK or in China depending on the difference in visa processing times. Only an immigration attorney can advise you of that.
Best of luck.