The Dictionary of Posh serves as an essential guide to the (ab)use of many English words by the decidedly up-market and the resultant - and endangered - language they speak: Posh.
 
Hugh Kellett hilariously captures the spirit and nuances of those who speak Posh and, allied with Oliver Preston's brilliantly accurate cartoons, this book is the key to understanding and interpreting this language ⁠- literally with tongue-in-cheek.  
 
Hidden within normal English is a separate language still spoken by those born with silver spoons in their mouths. It's called Posh. A word of English can be spelt the same but mean something completely different in Posh. If you say the word 'Mention' in English, people will understand 'Remark upon'; but in Posh this means a large house. Say 'Ace' and speakers of Posh will think you are referring to a cold thing one's butler puts in one's G&T.