Originally Posted by
andreiz
Apologies if this has been covered, but am I allowed to transit the country of origin (without stopover) when ending in that continent? For example, my DONE3 originated in NRT – am I allowed to finish with ...-LHR-xNRT-SIN-HKG-NRT?
As said up-post. No, you can't transit NRT.
Looking at your ending itinerary, you can only have 1 stopover (either at SIN or at HKG, but no both). Note that you have 3 segments in Asia already.