For two years or so UK citizens have been eligible for 2-, 5-, and 10-year visas to China. However, despite knowing a number of people who travel to China regularly, I know no one who has received a 5-year or 10-year visa. In fact, the form to submit at the visa centre doesn't even have an option to request a 5-year or 10-year visa.
The Chinese embassy says this:
"As of Monday, 11 January 2016, in line with the reciprocal visa arrangement between China and the UK, the Chinese Embassy and Consulates in the UK will issue two-year multi-entry visas to eligible British nationals who intend to go to China for commercial/trade activities, as a tourist and to visit family members/relatives. Five-year and ten-year visas will be issued to eligible British nationals."
How does a British national become eligible for a 5-year or 10-year visa?