Gina McKee

Character: Wallis Simpson

Emma Davies

Character: Elizabeth, Queen Mother

Nick Waring

Character: Edward VIII

John Sackville

Character: George VI

Emma Campbell-Jones

Character: Thelma Furness

Richard Harrington

Character: Narrator

David Summer

Character: Alexander

Lady Colin Campbell

Character: Self

Andrew Morton

Character: Self

Anna Sebba

Character: Self

Adolf Hitler

Character: Self (archive footage)

Elizabeth II of the United Kingdom

Character: Self

Queen Elizabeth the Queen Mother

Character: Self (archive footage)

King George VI of the United Kingdom

Character: Self (archive footage)

Wallis Simpson

Character: Self (archive footage)