Dame Julia WalshPlayed by Janet Mcteer
Sir Hugh's immediate superior in MI6, Dame Julia is as wily as she is enigmatic. A supreme political player who is no stranger to playing the long game when it comes to dealing with foreign intelligence agencies - the CIA in particular - her past affair with Sir Hugh means that there is a certain amount of strained cordiality between them. Though she doesn't let this prevent her from telling him what to do and her desired outcome of his investigation. Unflappable and cool in the face of hostile encounters and deep-seated revelations of those that her agency are charged with monitoring, Dame Julia is an imperious presence who, like Sir Hugh, is intent on discovering who is the mastermind behind the plot to unseat Nessa.