Due to the lack of availability with BA using a 2-4-1, I have adopted an alternative approach in using Virgin Atlantic points (heresy, I know in this forum - apologies) to Shanghai for a few nights then using Avios with JAL in J cabin to HND. For the return I have used Qatar Airways from HND - LHR via DOH in Qsuite cabins. Gives me a chance to try alternative airlines and for the return, from my previous experiences, a better class product than BA J. The one-way taxes levied for the return from HND to LHR equates to £51 each! Amazing value.