Urinetown the Musical, St James Theatre, London
St James Theatre, London: Musicals from The Producers to Monty Python's Spamalot and The Book of Mormon have long capitalised on sending up the genre they exist within, cross-referencing other musicals by way of elaborate in-jokes. But although we're only finally seeing it in London now, Urinetown - which was first seen at the New York International Fringe Festival in 1999 before transferring to Off-Broadwa…