"Working class" is a separate class from "blue collar"?
Wealthy tradespeople are generally small business owners not those working for someone else. It also strikes me as strange that the term blue collar = just the "royalty" of the blue collar world.
Often you wouldn't actually define - at least if you're from the social group in question! - a man who runs a little building firm that employs a handful of people a tradesman anyway of course...
