I think it's clear to most who read this board regularly, but might be important to repeat (and test / challenge my understanding), that there is a difference between gaining entry in China once you're at the border (i.e., Pudong Airport) vs. at the point of departure.
At the point of departure, it's highly dependent on where you are and local policy. I know from the US you'll need Chinese embassy "permission" to board a flight, and this in turn requires a negative PCR test plus blood antibody tests (with Chinese vaccines possibly helping). These requirements may vary in other countries.
However, once having arrived in China, treatment is pretty much* the same. As Steveb1955 wrote above,
Non-Chinese nationals in the U.K. holding valid Chinese residence permits for work, personal matters and reunion will no longer be affected for entry into China.
Actually it's not just in the UK, it should be anywhere, once you arrive at China's border.
*I say treatment is pretty much the same because as far as I know, you'll be allowed entry and will have to quarantine. The exception is Macau. If you can get into Macau somehow and stay there for 2 weeks, you can enter mainland China without quarantine.