idea was to just check for availability via BA site. if there is availability u should be able to book through any ow airline i guess.

but to make it even more complicated:

booked and upgraded some flights today myself. first checked on qatar site for availability and there was availability shown for all of my flights and also for flights on almost any dates around my flight dates. so i went ahead and called qatar before booking anything. didnt want to end up with some eco tickets booked not being able to upgrade them later. interesting response from qatar was, there is almost no availability for upgrades during whole month - although shown on the website?

so after about 3 calls i finally was able to get flights identified where there were seats available for upgrade. had to switch from KUL to BKK but couldnt care less. so booked them and upgraded myself through website. although it didnt work on first try, but it finally worked.used the upgrade function under my trips for the selected flight which didnt work for me. had to use the redeem miles option and selecting the flight from here to be able to upgrade! funny people this website developers from qatar!

its worth to note, that i also was able to upgrade the first leg using miles and the second leg using qcredits! this cant be done on the phone, as the person on the phone can just upgrade complete flights (both legs) using either miles or qcredits but not using both on one flight!