By far the best-value way to improve one's investing returns is to buy Harriman's New Book of Investing Rules. This is a fresh edition of a manual first published 16 years ago. It costs a mere £19.99 and includes practical contributions from more than 50 investment experts on how to generate profits by buying and selling shares. I know a few of the investors who have provided their insight in its short chapters, including Ashton Bradbury, Gervais Williams and Jacob Rees-Mogg, and it is worth listening to all of them. The book offers more than 500 pages of hard-won wisdom and could surely help anyone who follows its advice to grow their portfolio.... Harriman House, the small British publishing firm behind this book, has a number of excellent titles on its list for anyone seeking to develop their understanding of securities markets.