And this is about 6 weeks away and you hold confirmed tickets for the flight? I really would not worry at all.

For starters you seem to be looking at the selling figures for the US market. For the UK point of sale there will be a different availability, and from my look at it, the business class is J9 C8 D5, which is wide open. Only one F, but that is quite normal.

Secondly on a daily basis there will be - I guess - a dozen changes to this service. It only takes one company to move their audit date by a day and a heap of business travellers will shift on to another service. Or indeed a large family could change their holiday plans and the buckets would open right up. Again this is what BA will sell from now, no clue as to what it has sold to this point.

Finally the Japanese end of the market is still quite travel agent dominated so that has a conservative effect on buckets. Every so often BA will pressurise the travel agents to ticket up their reservations and some availability will be released since a passenger may have been sitting on several reservations. Cash First travellers are particularly fickle, they can and do make a lot of changes.

Flyertalk is marvellous but it sometimes gives the impression that overbooking (or whatever) is a massive problem. That would be an unrealistic view of the world of flying generally and BA specifically. Yes it happens but there is certainly nothing you can do about it at this stage, not least because your service isn't particularly full.