Dave and fellow comedian, Owen O'Neill's stage adaptation of "The Shawshank Redemption" is now licensed with Broadway Licensing, New York for all performances in North America. https://broadwaylicensing.com/shows/musicals Then scroll down to "Playscripts" at the very bottom of the page and then enter "The Shawshank Redemption" into search box.
For licensing rights to perform the play in the U.K. and Rest of the World contact: https://www.knighthallagency.com (Charlotte Knight)
Dave's first paid weekend at the Comedy Store, London was in 1991