(01 Jan 2015, 7:10 pm)Dan wrote By 2022, I'd imagine that the provision of Wi-Fi, Next Stop Announcements, and plug sockets will become standard on all buses (a lot of bus operators have already added Wi-Fi to a large amount of their fleets). I don't think it'd be irrational to suggest that they'll be moved off the X21/X22 services in a couple of years time, and moved to a lower rank on the hierarchy of Arriva's bus services.

As 57-reg vehicles, these vehicles should in fact be disposed of in 2022.

Interesting views. Certainly the likes of sapphire  shouldn't  be expected to be run with aged stock, not as a premier  service.  It does raise other policy questions though. For example the omni city's for the X66  These are nigh on 10 at the point of entry onto a high speed front line MAX service. Maybe their time should be limited as well
Also,  bear in mind that ANE ensure book values are always nil and some more before vehicles are withdrawn. Recent Darts and Prestige examples have all only gone after 17 or more years.