Perhaps a useful data point for anyone wondering where to start a RTW ticket in Asia.

Priced up Asia-LAX-DFW-SCL-GIG-LHR-Asia in J (DONE4 i believe?) to give an idea of the best place to start. Following start locations, all in GBP:

HKG - 7269
ICN - 6475
TPE - 7425
NRT/HND - 5232