If UK liberates a chinese territory then that territory is chinese. It is impossible for a chinese territory to ever be controlled by the UK (or the US or ANZAC) as it will always be returned immediately to the chinese. Just because the UK will have units in the territory doesnt mean they control it.
Here are the rules on liberating a territory in case you are a little unsure on them.
Liberating a Territory
If you capture a territory that was originally controlled by another member of your side, you “liberate” the territory. You
do not take control of it; instead, the original controller regains the territory and its income. Antiaircraft guns or industrial
complexes in that territory revert to the original controller of the territory.
If the original controller’s capital is in enemy hands at the end of the turn in which you would otherwise have liberated the
territory, you capture the territory, collect income from the newly captured territory, and use any industrial complex there
until the original controller’s capital is liberated. You also take ownership of any antiaircraft gun in that territory.