(01 Sep 2016, 7:23 am)busmanT wrote A new Streetdeck costs £225,000, so a spare can't be justified for a PVR of 7, the new vehicles are generally very reliable. It is a different business decision as the PVR gets higher.
To be honest, although an extra StreetDeck might have been beneficial for the X21, got to remember that at no evening or Sunday service currently exists as of yet meaning that the buses are only out for 13-14 hours maximum and only 6 days per week in most cases.