Compose Yourself: And Write Good English by Dr Harry Blamires
This title has a simple thesis: to write well you need to think clearly about what you want to say. The author brings the reader's common sense into play to illustrate how by thinking through what you want to say and how you say it, you can communicate both effectively and elegantly. Divided into four sections: using the right words; conveying meaning effectively; making points persuasively; and habits to be avoided, the book is aimed at anyone who has ever had trouble puuting their thoughts on paper and those who want to sharpen their skills. There are many contemporary examples from magazines, books, advertising material and more, illustrating both good and bad English.