Perth Theatre have announced the cast for Sunset Boulevard: The Backstage Cut. The show will star Juliet Cadzow (Balamory) as Hollywood star Norma Desmond, and John Kielty (The Belle Stratagem) as screenwriter Joe Gills. Frances Thorburn (River City) will play Betty Schaefer, and Mark McDonnell (Good Omens) will play Max and Billy Wilder. It is…