This does look interesting. There's still an unanswered question as to which fare bucket they book into. Can we assume they're eligible for TP and Avios? What about OnBusiness, but that's much less important.

I notice you get a better price the further you can commit to booking in advance but there's one option that lets you book up to 4 hours before. Will it let you book any flight that has seats available as long as you book by the deadline or is it tied to a lower fare bucket meaning that you may have difficulty obtaining tickets at the last minute?