Originally Posted by
windowontheAside
I think that you can only mix adjacent cabins on ba.com. So WT+ with WT or CW, but not F and so on.
No idea why that limitation is there, but I'm sure you can book it by phone.
It's debatable if that would count as a website bug so you could get service fee waived, but a sympathetic agent might be able to do so.
Interesting. I thought it was adjacent cabins too, but you can mix WT+ with F, so it seems 'tied' to Economy for some reason.