Hi:

I have a BA redemption booked that includes a BA-operated initial sector to LHR and then two QR sectors to DOH and then on to BKK. It is a J redemption.

The LHR-DOH sector is on the QR16 all-business class A319.

Ideally I would like to change this sector to the QR2 A380 service that departs some 25 minutes earlier and is a slightly faster flight, yielding a more comfortable layover in DOH before picking up the BKK sector.

Now, here is the question. There is no redemption availability on ba.com whereby I could change the flights. However, there is a bunch of J availability on the QR2 flight (J9) that I would like to change to.

I doubt BA can change it since there is no redemption availability and I suspect QR will say they can do nothing at this stage since it is a BA redemption.

Does anyone have any ideas? Is it likely that I might be able to get QR to change it at the airport on the day at LHR T4 (in which case I wouldn't check any bags straight through). I've had success with something like this before with AA using their 'on-the-day flight change' facility, but I have no idea if QR operate anything similar.

Thanks in advance