You may find that as JLR/MG expand their market in the coming months and years then a Chinese will indeed start a regular service into BHX, but in the form of a freighter.
Every carrier will ask the same old question is there significant potential for a route to XYZ? If there is then it will start one, if not it won't. These days carriers do not want to invest in white elephants, even if cities or councils etc twin with others. All the talk of twinning BHX and POS is nice and promotes possible traffic, but no carrier will hurry to start the route anytime soon. BHX and ORD has been mentioned before and there is still nothing on the cards.
It's all pipe dreams for the spotters on various forums.