Let's see if anything changes with my KBP-LHR-MAD-LHR-KBP booked in J as BA883 / BA520 / BA7050 / BA882.
No problem with selecting seats on bacom for 883/882.
520 shows me the seat map on bacom, allows me to change seats, but throws a wobbly when I try to save. "Sorry, we are unable to process your request. Please contact your local British Airways office".
7050 sends me over to Iberia where the existing seat allocations are shown with the message "This flight does not permit seat selection".
What a pile of $hite.