The 24-year-old was runner-up in the 2010 BBC talent series, which followed the search for a new theatre star to play Dorothy in Andrew Lloyd Webber’s production of The Wizard Of Oz.
Wicked tells the backstory of the Wizard Of Oz’s witches Elphaba and Glinda before they became known as the Wicked Witch of the West and Glinda the Good Witch.
Other performers joining the London cast include Bradley Jaden as Fiyero, Melanie La Barrie as Madame Morrible, Andy Hockley as The Wizard and Jack Lansbury as Boq.
The show tells the backstory of the witches from the Wizard Of Oz
The production is a three-time winner of the theatregoer-voted WhatsOnStage Award for Best West End Show and a two-time winner of the Olivier Audience Award.The new London cast will take over their roles on July 24.