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Kristin Scott Thomas as Diana Taverner, the ruthless MI5 spymaster, standing authoritatively in a dimly lit office with a city view.

Kristin Scott Thomas embodies Diana Taverner's ruthlessness in Slow Horses

Despite embodying MI5's "ultimate ice queen," Diana Taverner, in Apple TV+'s Slow Horses , actress Kristin Scott Thomas imposed a strict no-profanity policy for her character.

Elena Petrova·June 13, 2026