Don't forget that service 151 is a victim of having NAC buses
after service 170 became a fully aircon service in late 2001.
Service 151 used to be a fully aircon service with MK3s and MK4s at
that time till most of the MK3s went to serve service 170 in
exchange for the NAC MK2 WAs.
Services 91, 92, 95, 107, 125, 186, 191 etc were also affected too
