Churchill was a crisp, classy blonde with blue eyes who appeared in several British films, playing the sardonic heroine in a handful of comic chillers during the early 1930s.

[3] Her big break came in 1935 with the British comedy film Foreign Affaires, directed by and starring Tom Walls.

A stint at the Oxford Playhouse taught her "an authoritative command of the stage," which aided her part as the young wife in Michael Egan's The Dominant Sex (1937).

Churchill performed in a production of Love's Labours Lost at The Old Vic opposite Michael Redgrave, with Hugh Hunt directing.

She gained recognition following her appearance in the 1948 West End revue Oranges and Lemons and was found to have an able singing voice matching that of her co-star, Max Adrian.

[6] After spending years in "fluffy West End comedies and farces", Churchill began taking parts in more serious productions.

[3] Ever ambitious, she joined The Old Vic for the 1940–50 season: "her Rosaline was a lacklustre revival of Love's Labour's Lost, but her brisk Kate in She Stoops to Conquer pleased the critics."

In 1953, she again entered revue when she was cast in High Spirits, proving "herself equally mistress of both an astringent bitchiness and of tender sentiment."