How exactly can you tell if somebody is really, truly posh?
Some would say it's all to do with social circle. If their friends include minor Royals, say, or they went to school with Bear Grylls, then they are posh. Some would point to clothes and style, saying that items like red trousers and signet rings give the game away.
Others, though – including many experts – say it's all in the chat. And this month, society magazine Tatler has thrown a spanner in the works by declaring the word 'pardon' (when asking somebody to repeat themselves) totally acceptable.
For years, pardon was seen as a mark of a middle class vernacular, while gently bellowing "what?!" showed true poshness.
Feathers will have been ruffled, but the society bible knows of what it speaks. Earlier this year it even published a list of other words that give away a person's true class, from 'beastly' to 'yonks'.
It was an illuminating read, and certainly not just a random collection of words hastily cobbled together on press day at Tatler Towers (though even if it was, they are the experts).
So where do you stand on the scale? Test your vocab with our quiz, and see if you're toff enough.