Host Graham Norton transports the final 20 hopeful girls to the magical studio kingdom of Oz in an all-singing, all-dancing extravaganza which marks the final stage of the audition process. In their toughest and most glamorous audition yet, our final 20 potential Dorothys must convince the Lord and his all new panel (Charlotte Church, Sheila Hancock and John Partridge) that they have the essential leading lady qualities required to continue on the yellow brick road to west end fame.