25 years since the first Harry Potter novel

This week Harry Potter and the Philosopher’s Stone turns 25. It has sold 120 million copies and is the first of 7 books in the bestselling series which also came to life on screen with a string of hit movies. Today's Nick Robinson speaks to Lindsey Fraser, former critic and literary agent at Fraser Ross Associates, and Nigel Newton, Chief Executive of Bloomsbury Publishing who published the book. (Image, Harry Potter first edition, Credit, Reuters Henry Nicholls)