That's for a USA point of sale. For the UK POS, where most people are likely to originate from, it's
F3 A2 J9 C9 D9 R9 I9 W9 E6 T1 Y9 B9 H8 K5 M2 L0 V0 S0 N0 Q0 O0 G0
but it's still a bit odd to be selling the cheapest fare bucket with so few seats left in the cabin.
Should BA sell a lot of those WT+ seats I expect they will simply upgrade some passengers to Club.