I'm seeing something really weird on the seat selection map when I try to make a booking for the BA248, April 1. I want CW outbound and WT+ on the return on April 10. I see the normal row 10-15 cabin for the 248, but the return flight is also showing rows 10-15 (but the seat icon is a square rather than the usual yin-yang). I would normally be expecting to see rows 21-14 for the WT+ cabin.
Any idea what is going on?