Just last week i was able to select seats on QF, LHR-SIN-ADL in J on a BA codeshare via the Qantas Website.
Not sure if there is a gremlin in the system but my seat selections are showing as confirmed on my BAEC account but when i go back to the Qantas website and enter my booking reference the selections seemed to have disappeared!
Has anyone had expereince of this before?
Thanks