this is undoubtedly what jon's doing here.
No, although I'm pointing out that what you describe as a "rigid class system" has more to do with Downton Abbey and Merchant Ivory films than any sort of reality.
It's true that we never had a revolution like France or lost two major wars like Germany (though both of those places very much have social classes) and nor do we have the delusion that exists among some Americans that they don't have social class, however it's not much of a a "system" and it isn't "rigid". If anything it's more of interest to marketing specialists than anyone else nowadays.
Literature isn't the best guide to day-to-day reality; class, money and societal conflict are something writers often use. They would have less to write about otherwise.
Remember, we invented Socialism, Universal Healthcare, Trade Unions, free compulsory education, the Welfare State and decolonisation. Our current Prime Minister is the son of two Indian pharmacists and our next one is the son of a factory worker and a nurse. But hey, we've apparently got a "rigid class system".