existentialist
Tired and unemotional
mid to late 70s (in terms of when things got that livery)
MDs (delivered in 1976/7) got that livery, as did DM/ DMSs from the same era
and the first few Titans / Metrobuses did
but while the livery hung on until buses got repainted, i think it went out before the 80s started.
I like to think of the 1980s as the late 70s, as it makes me feel less old.