Haven't read the thread but OP that's not the definition of middle class!
From the Cambridge dictionary OP.
"Middle class - › a social group that consists of well-educated people, such as doctors, lawyers, and teachers, who have good jobs and are neither very rich nor very poor:
The upper middle class tend to go into business or the professions, becoming, for example, lawyers, doctors, or accountants."
So actually middle classes do have to work! And actually you might perceive some one as wealthy but how do you think they got wealthy by working damn hard they had to work to earn that money and it doesn't mean they can give up work. The have children to support mortgages to pay etc.
I also think you've miss understood what David Cameron has done he's mearly resigned as leader of the party he's still going to be an MP he's still going to have a job.
To answer your question do I know any one middle class by the actual dictionary definition. Yes pretty much every one I grew up with. In fact most people are these days.