Thanks all. Interesting info c-w-s.
The earlier flight isn't feasible due to committments in Belfast before we travel.
It appears that there's good availability in J on the next ba flight to HKG so no worries about that. CX would be ideal as that's the airline we initially booked with before they cancelled the direct flight from DUB.There's no problem with a couple of hours delay and there will be many flights onward to TPE from HKG. Would that be arranged by ba or on arrival at HKG? We don't want to collect luggage until TPE.