Oooh--a new term! They didn't cover this in any of the Sophie Kinsella books I've read (I have appalling taste in 'literature,' and almost everything I know about British pop culture comes from terrible Brit-chick-lit novels). I've identified a few Chavs here at work, even (although the hip-hop wannabe element is lacking, so I guess they're not true Chavs).
Wikipedia has way too much documentation on the phenomenon (all of which you've nailed):
http://en.wikipedia.org/wiki/Chav