Social class

Flor's mother disapproved of Flor's relationship with Margaret, as she wanted her to marry someone of higher social class, closer to their own financial standing. Flor did not understand, as they already had estates, while Margaret brought something entirely new in her life. (AUDIO: Dead and Breakfast)

Addressing humankind shortly before the Battle of Canary Wharf, Cyber-Leader One announced that their upgrade to cyber-form would remove, among other things, class. (TV: Doomsday)