The HKG flight stopped operating a while ago now. I heard it was due to initial crew shortage in Europe, but haven’t heard anything in a while. I know it always left extremely full most days.
I have never heard any rumours of UPS leaving Stansted. I find this very doubtful though. I know they also operate to EMA and EDI but I doubt they would want to truck all south of England freight from EMA though. Also I doubt they’d move to another London airport.