I'm cringing writing this, but having just made a post in the Bygone Era about seeing an Alexander Strider as a young boy, I've just remembered my logic for bus types...

Wright Renown - ''Consett buses'' - because they were on the 778 service to Consett.
Plaxton Prestige - ''Stanley buses'' - because they were on the 729 service to Stanley.
Optare Delta - ''Moustache buses'' - I thought the front engine grill looked like a moustache.
Dennis Trident (Lolyne) - ''Sad buses'' - to my eyes, the front panel with the lights looked like a sad face.
Dennis Trident (President) - ''Happy buses'' - I thought the front panels made the bus look happy.
Any Arriva bus - ''Durham buses'' - I didn't know Arriva services went to Newcastle.

I thought I may as well just tell you all what my logic was like back as a little boy.