If you can find "partner" Business Class award availability on each individual segment -- and that's a big if -- you should be able to get the roundtrip for just 240,000 BA Avios by redeeming for a "multi-carrier" award. You would have to include at least two of BA's oneworld partners -- with or without BA -- on the itinerary. Watch out, though, for very high carrier surcharges on the long-haul segments.

https://www.britishairways.com/trave...e/public/en_us