Overview

• The series premiered June 18, 2025, on BritBox and U&Drama as the first television adaptation of Mary S. Lovell’s biography of the Mitford sisters.
• Bessie Carter’s lead performance as Nancy Mitford has been singled out for its intelligence and wit, supported by Joanna Vanderham’s depiction of Diana’s radicalization and Shannon Watson’s portrayal of Unity’s extremist fervor.
• The narrative spans September 1931 to January 1937 and illustrates the family’s aristocratic decline alongside rising ideological tensions in pre–World War II Britain.
• Cast members conducted extensive research including reading the sisters’ private letters to capture their distinct voices and complex family dynamics.
• Critical response has been mixed, with praise for its immersive production values and performances balanced against critiques of superficial treatment of historical context.