BA and CX are the two biggest benefactors for students from UK to HKG by some way - and this is a massive market for them as it mainly relies around the peak travel periods, hence higher revenues.
There are a considerable number of private/boarding schools in the North West alone that would help fill the CX aircraft up to HKG, not to mention other cities near by plus the 000's of Chinese people living in Manchester. Manchester United being in the city is just the cherry on top of the cake!
CX could make MAN daily non-stop and it would be full, both cabin and belly almost everyday of the week. The HKG market, as figures show, is massive in the NW.
Also of note - CX's 77Ws are 3 class - another F class carrier at MAN.
This the airport that can't support F?