I think this needs to come to an attention again, since many bus
models are deregistering soon. 
Recently the Mercedes Benz O405 DMs and the
almost forgotten Volvo B10M MK4 SC.
Once the Darts are gone, there might be no midi buses in SBST
fleet in future. 
Let's enjoy them while we can.
Current status...
SBS8009A (BNDEP SP/42)
SBS8015G (BNDEP SP/42)
SBS8016D (BNDEP 42)
SBS8018Z (BNDEP 42)