In 2005 Janson appeared in
Tick, Tick... Boom! at the
Menier Chocolate Factory. She played Susan, alongside
Neil Patrick Harris as Jonathan and Tee Jaye as Michael. In 2006 she joined the original
West End cast of
Wicked as part of the ensemble, later moving to be standby for the role of
Elphaba. Following this, she joined the final West End cast of
Avenue Q as Kate Monster/Lucy the Slut. Janson has appeared in several shows Off-West End, including
Company at the
Southwark Playhouse (as Amy),
Rooms: A Rock Romance at the
Finborough Theatre (as Monica), and
Blood Wedding at the
Courtyard Theatre In 2013 she returned to the Menier Chocolate Factory in
Candide, playing the role of Paquette. Following this, she played Ruth in
Dessa Rose at the
Trafalgar Studios, alongside
Cynthia Erivo as Dessa. On 30 November 2015 Janson took over the role of
Carole King in the West End production of
Beautiful: The Carole King Musical. She joined Carole King at the
British Summer Time concerts to perform
I Feel The Earth Move. She remained with the production until it closed on 5 August 2017. In 2018 she appeared in a revival of
Chess as Florence at the
London Colosseum, alongside
Michael Ball as Anatoly,
Alexandra Burke as Svetlana, and
Tim Howar as Freddie. In April 2019 she appeared in
Man of La Mancha at the London Colosseum, sharing the roles of Aldonza and Dulcinea with
Danielle de Niese. The production played a limited run to 8 June 2019. Following this, she has been cast in the new musical
& Juliet, which is currently showing on the West End at the
Shaftesbury Theatre. She stars as Anne Hathaway,
William Shakespeare's love,
Shakespeare being portrayed by
Oliver Tompsett. Janson won an
Olivier Award in the category of Best Supporting Actress in a Musical for her performance of Anne Hathaway. == Leading Ladies ==