Sentence:  For all its <WSD>postclass</WSD> pretentions, modern Britain was just as feudally cleaved into serfs and landowning genrtry as it had been in the Middle Ages, and entering his own middle age Ellio was personally out, while gloating facades on either side of the road rose implacably against this poor asshole American who hadn't the brains to have swung onto the much-vaunted "housing ladder" when he'd had the chance. 
Meaning of the word marked with <WSD> tags:  Having no rigid class structure (in a society that previously had one).