The story about this Brit citizen was that he was accused of drug trafficking. Considering that the past history of Chinese court cases that about 90% of cases of where you are accused of something end in a successful conviction in favor of the state I would say I don't believe the Brit had much of a chance of being turned out to the British Embassy in China. Also, executions should only be reserved for sure for only two actions: unwanted, violent, sexual actions (i.e. rape) and intentionally killing another human being and planning it in the first place; this excludes soldiers fighting each other in wars and individuals doing self-defense against very grave physical injury or death by another human being.
They executed the man was cited on drug charges. How in the would do you kill someone for either substance addiction or selling to people that intentionally with knowledge know they are buying addicting or sensory-alternating substances?