Today's guests are comedian Jason Manford and author Sir Terry Pratchett, who is famed for his Discworld fantasy series and has sold more than 65million books worldwide.

Despite battling Alzheimer's, Sir Terry remains as busy as ever. He has just published a new book called Dodger, which was inspired by Dicken's Artful Dodger character. Set in Victorian London, it features characters including Dickens, Disraeli and Queen Victoria.