DS Louise Rayburn

DS Louise Rayburn works close protection for the Metropolitan Police, partnered with David Budd on the detail guarding a controversial Home Secretary. She's meticulous, watchful and unshowy, the kind of officer who notices when something doesn't add up and says so, even when it's inconvenient for the people above her.

Nina Toussaint-White plays her as the show's steady moral centre amid all the paranoia and double-dealing—someone who does her job properly and expects others to. That quiet professionalism becomes genuinely tense once the plot starts testing whether procedure can survive contact with power, conspiracy and a partner she can't fully read.