Mark, as well as being a one time Guinness World Record Holder for the most demonstrations in one day is a rare beast - an effective comedian. His work has changed the law and kyboshed politicians’ careers. He talks about his new book, The Liar's Quartet. In the final weekend before the election, he's just what we need.
Comedian and activist Kate Smurthwaite will perform in the first half. There is an interval in this event.