Diana Taverner, a central character in the espionage drama series "Slow Horses," has finally assumed the role she has long coveted: head of Britain’s MI5, known in the show as “First Desk.” This development marks a significant turning point in the sixth season, adapted from Mick Herron’s novels “Slough House” and “Joe Country.”
Taverner, portrayed by Kristin Scott Thomas, had previously been the formidable “Second Desk,” characterized by a willingness to upend established systems rather than make incremental changes. Her elevation follows the forced retirement of her predecessor, Claude Whelan, played by James Callis, who exits the agency after being blackmailed in the previous season. Now in command, Taverner’s decisions drive the season’s narrative, unleashing a cascade of betrayal, violence, and chaos.
Despite finally achieving her ambition, Taverner quickly finds the pressures of power overwhelming. Director and executive producer Adam Randall describes her as navigating situations that leave her visibly unsettled, including a tense early scene where she is coerced into an appearance on a right-wing television program. Randall notes that the character experiences moments of vulnerability and fear, adding layers to what might otherwise be a purely ruthless figure.
Scott Thomas, who says she is not an avid reader of spy fiction, emphasizes the complexity that the script allows her to bring to Taverner. She characterizes the agency’s key figures as “useless-likable” or “likable-useless,” and describes her own role as a “guilty pleasure” for viewers reluctant to admit any affinity for the morally ambiguous Taverner. Thomas has resisted categorizing her character as a typical “strong female” archetype, instead focusing on Taverner’s exercise of power in a male-dominated environment without reliance on traditional gender or romantic subplots.
The series also explores Taverner’s interactions with other women in intelligence leadership roles, notably Ingrid Tearney (Sophie Okonedo), one of her predecessors as First Desk. A memorable sequence featuring a competitive drinking encounter between the two highlights generational and gendered dynamics within the agency’s upper ranks. Scott Thomas reflects on Taverner as a woman holding onto authority amid younger male colleagues, a portrayal she finds both challenging and resonant.
At 66, Scott Thomas acknowledges that while she does not personally identify with Taverner’s struggle to maintain power, she understands why others might see parallels. The sixth season of "Slow Horses" continues to delve into the complexities of espionage, leadership, and personal ambition, anchored by a nuanced performance that adds depth to a character navigating a treacherous world of intelligence and subterfuge.