Thank you Percy Smith for providing the information so quickly.
If upgrade spaces are available then my journey DUB-LHR are economy and LHR-SIN-HKG-LHR will be upgraded?
That’s ok, since the seat are the more or less the same on intra EU flights and I was more keenly looking forward to long haul LHR-SIN + HKG-LHR for sleep and possibly bonus on the SIN-HKG sector.
How do I clear all upgrade segments? Who do I e-mail or call to? BA? Avios? CX? Asiamiles? Or Marco Polo?
Since both LHR-SIN and HKG-LHR are similar timing I don’t really mind which flights, hence I want to book the one that I can upgrade on if spaces are available. Is there anyway I can search for which specific flights that have space available to be upgraded or not? Or are they hidden in a secret airline search system?