My guest for this episode has spent over 40 years in the publishing business, editing everyone from Professor Stephen Hawking to Douglas Adams. And now it's his turn to write a book rather than edit one, and so Peter has written "Emeralds of Oz: Life Lessons from Over the Rainbow" a look at the wisdom we can glean from one of the greatest films ever made, which went out on general release on this date 25th August, exactly 80 years ago.