Fletcher and Ako are currently appearing in a special staged concert of the musical, playing Fantine and Eponine respectively.
Appearing at BBC Radio 2's Last Night of the Proms in Hyde Park, they performed a mix of of the heart wrenching I Dreamed A Dream and On My Own.
If you missed the performance live, you can watch it now in the video below...
Meanwhile, it's been confirmed that both Fletcher and Ako will reprise their roles when Les Misérables re-opens at the Sondheim theatre in December.
Fletcher will play Fantine between 18 December 2019 and 29 February 2020 and again from 20 April 2020 until 25 July 2020. Rachelle Ann Go will play the role from 2 March 2020 until 18 April 2020 before taking over from 27 July 2020.
They will be joined by Jon Robyns as Jean Valjean and Bradley Jaden as Javert.
Gerard Carey will play Thénardier, Josefina Gabrielle will play Madame Thénardier, Ashley Gilmour will play Enjolras and Lily Kerhoas will play Cosette. Casting for Marius has yet to be announced.
Adapted from Victor Hugo's novel, Les Misérables shares the epic tale of a man's life journey through 18th century France and his struggle to live through the injustice and revolution of the time.
Featuring the songs I Dreamed A Dream, Do You Hear the People Sing, Bring Him Home, and many more - it's a must-see.