the citybuzz svcs don't need DDs,
i hope SBST take out those DDs on citybuzz and replace them with
dennis dart or NAC Mk 2 or scania
citybuzz unfortunately needs DDs for "sightseeing"
just give it Vox2
instead 
svc which don't need DDs are
93, 153, 161, 165
actually, they just need it for peak hours, except 93, doesn't
need it at all
and 12 doesn't
really need to be full DD fleet