Ruth Negga
— Shirley Bassey
Amira Arish
— Shirley Bassey (Aged 9)
Lesley Sharp
— Eliza Bassey
Charlie Creed-Miles
— Mike Sullivan
Jeany Spark
— Juhni Sullivan
Henry Lloyd-Hughes
— Kenneth Hume
Danny Sapani
— Bobo
Babou Ceesay
— Henry Bassey
Isaiah Cai Forrest
— Henry Bassey Jr
Divine Faith Utonga
— Sharon Bassey
Larissa Wilson
— Iris Bassey
Matthew Marsh
— Jack Hylton
Di Botcher
— Mrs Morrison
Colin Mace
— Agent