The show's stars, Leanne Jones and Michael Ball, picked up the prizes for best actress and actor in a musical, while Tracie Bennett earned the award for best performance in a supporting role in a musical.
"Saint Joan" was named best revival, "The Magic Flute" best musical revival, "A Disappearing Number at the Barbican" best new play and "Rafta Rafta" best new comedy.
Chiwetel Ejiofor earned the prize for best actor for his work in "Othello" and Kristin Scott Thomas grabbed the award for best actress for her performance in "The Seagull."
Texas principal bans speaking Spanish, stirs controversy
18-year-old elf alleges mall Santa pinched her buttocks on the job