Isn't the main reason for Concorde speed? So you can get to your destination earlier??
Surely it would make sense to fly F on one of the early morning flights rather than sit around for 10-13hour. Why would or should they pay out a room when you choose to hang around longer and arrive at your destination later?
** Yes now Concorde is on her way out any excuse to fly her is valid
** The above is what I consider common sense and not just the view of a BA apologist,