After a bit of tinkering our route is now looking like:

OSL-xHEL-BKK-HND-BKK,KUL-MNL-SYD,CNS-xSYD-AKL-LAX-MIA-UVF-LGW,LHR-OSL

Have removed the overland segment to HAN and decided to do a full loop back round to BKK instead saving a surface segment. And added in St Lucia towards the end of the trip.

Annoying having the wasted segment from LGW-LHR but can't seem to avoid it as the only direct flight to London from UVF is to LGW, and to OSL only from LHR.

We're now at a stage where we're ready to book and lock it in pretty much. Just wondering, is there any advantage to book via e.g. the AA service desk, rather than through the tool? It is accepting the itinerary and spitting out a price (~£5.3k), so is there anything to be aware of to stop me just putting in CC details and going with it right now?

Excited!