I'm gonna point this out, just so people aren't demonising the wrong people.
Chavs and the working class are not the same thing, nor are all chavs from the working class. Sadly a 'documentary' about chavs decided that the word was just a euphemism for the working class and proceeded to attack the upper classes for discrimination.
Chavs can be from any class. They are, for the most part, people who think swearing all the time, drinking crap booze and fighting is great.
In short, they're idiots but not necessarily poor idiots. I've seen chavs who have spent thousands of pounds on souping up cars a la Fast & the Furious, then proceeding to crash said cars in short order.
They like top-shelf magazines and have no real interest in improving themselves or their situation.
I want to repeat, they are not the same as the working class, that's insulting to the working class. People from the working class are, for the most of those I've met, pleasant and good people.
Chavs are not.