Here are the Taxes for 1 Adult, J class to HKG in HKD.
LHR - $1,529 (LON UK Air Passenger Duty HKD1,261 & LON UK Passenger Service Charge HKD268)
AMS - $339
FRA - $341
PAR - $902
Good one UK Gov
I'm sure many are going to take a short hop across the channel just to avoid most of your insane taxes.