"U" word using miles. It is possible on all fares through Asiamiles.
Nobody likes the "U" word around here yet people keep asking how to do it.
True, it's one of the most difficult programmes to earn tiers on, but with the miles one can upgrade any return route on BA on any fare in coach, business from anywhere to next class of service.
It's ASIAMILES.
I just used 70K for an upgrade from Biz to First between LON and SAN return next month.