The Chinese factories will make impeccable stuff if the client specifies it properly, pays them sufficiently, and monitors quality. Miss one of the three, and shite comes out. There may be a tendency for Chinese factories to cut corners and try to rip off the client, but UK factories will do that too, if not closely monitored. In any supplier relationship, the client wants as much as possible for as little money as possible, and the factory wants the exact opposite.
Short version: if a company offshores and the quality goes south, it's their fault.