Basically what MrsPeaches said and with more stratifications. I see way more than 3 brackets, the accent groups and all the other trappings of class stretch from the mythical heavenly top, people you can only theorize to exist all the way down to missing teeth and barely speaking english in hell underneath the poverty line.

I've been lucky enough to see a lot of the levels, it's vastly different to my home country which only really has the three levels (it isnt discussed) and is largely culturally homegenous.