I think some of it is the pompous goverment Minsters who think the Uk has to stick its nose in everywhere, much of china still lives in poverty but like others have said China has enough cash if it feels the urge to help them.
They wont of course as already labour costs are rising and some areas have huge amount of jobs which need filling! They certainly dont want the avg cost of living rising to much for the plebs otherwise they would lose the huge advantage of cheap person power.. The rest of the world doesn't want that either as nearly all countries rely on cheap goods from China as well.