John Lloyd marks the 30th anniversary of the book he co-wrote with the late Douglas Adams. It's a strange dictionary, as you'd expect from the inventor of The Hitchhiker's Guide to the Galaxy and his radio producer. In The Meaning of Liff you'll find definitions in a new dimension, as place names become definitions for experiences we recognise but don't really have a word for. It started as a game for Adams and Lloyd but Stephen Fry and Matt Lucas now tell Lloyd why they love it. Fellow devotee Professor Steven Pinker talks about the psychological relief and sense of bonding that comes from realising you're not alone in having the thoughts and feelings that Liff captures. And the studio audience throw in their own suggestions, too, to be judged, accepted or rejected by Lloyd and his distinguished judges Helen Fielding (creator of Bridget Jones), ex-Python (and Chaucer scholar) Terry Jones and actor/writer Sanjeev Bhaskar.