Boyle joins the previously announced Elaine C. Smith, who plays Boyle. Smith has previously appeared in the West End in Calendar Girls and is best known for TV's "Rab C Nesbitt," in which she plays Mary Doll.
In a press statement, Boyle commented, "I am thrilled to be a part of the musical about my life story and very much looking forward to stepping on stage and performing with the cast. It is an honest portrayal of my life and has been a cathartic process to be involved in." This marks the first opportunity audiences have had to see her perform live on a U.K. stage since the Britain's Got Talent tour in 2009.
Elaine C. Smith added, "It’s obviously an amazing challenge as a performer to be asked and involved in a project as fantastic as this. There’s a lot of pressure to get it accurate and to honour Susan’s life story but to do it in a way that is funny, moving and magical and, as the writers, producers and performers, we’re doing our best to achieve that. We’ve been working towards this for the last 18 months but it’s now really exciting to see the whole thing come to fruition and to be working with Susan on such a wonderful event."