It is deeply unfashionable to care about the proper use of language and grammar these days. Wince at "between you and I", get annoyed by "me and my friends", question a misplaced and misleading apostrophe and you will probably be dubbed an old fogey or, worse, an "elitist". You can expect a solemn lecture about how language is always changing, and how usage is what counts and sets the standards.
Well yes, language is always changing, and ultimately usage does set the standard, but (unless you are a politician or someone else with an agenda of their own) the purpose of language is to communicate, and not just facts. How we use it also communicates attitudes, how we see other people, and how we want to relate to them. Correct grammar does these things - sloppy usage does not, or at least reduces language's effectiveness.
For that reason this book should be required reading for journalists, broadcasters, and anyone else who supposedly communicates for a living. It is concise, logical, informative, and even humorous. It explains why we use, or should use, words in a certain way, and is fair enough to point out those forms that came about for academic reasons and can safely be forgotten. I wish it had been around when I was studying English at school!
And (showing my age again?) I really appreciate the fact that it is, despite the low price, a hardback.