Just adding a little information (hope you don’t mind, OP) from the Youtube description:

A medley of “I Dreamed a Dream”, “Bring Him Home” and “One Day More” performed at the Laurence Olivier Awards – December 1985.

in order of appearance: Patti LuPone, Colm Wilkinson, Frances Ruffelle,
Michael Ball, Rebecca Caine, David Burt, Alun Armstrong, Susan Jane
Tanner, Roger Allam