I can empathise with QF WP with the need for the flexability aspect of K class or above - for me on work I've got to stay there until the job is done, and so am never sure exactly what time I'm coming home. I can certainly see that if I was just travelling for a training session or the like I could bump down to a lower fare and you can be certain I take the lowest price when it's time for holidays (once my holidays in place, no-one is taking them away from me! )