Class 317 (preferably super detail) in both variants and all liveries:
317/1:
Blue/Grey
NSE
NSE 'Prism' with Green stripe
WAGN purple
WAGN purple with FCC branding
FCC
'one'
'one' with NXEA white stripe
NXEA
Stansted Express
317/2:
Blue/Grey
NSE
WAGN white
WAGN white with NXEA white stripe...