A stripped-back revival in London, directed by Jamie Lloyd, brings the classic musical into the present day, and gives Scherzinger a career-defining performance.The 1993 Andrew Lloyd Webber musical “Sunset Boulevard” is about a former screen star’s descent into madness. So it seems appropriate that its bravura new West End revival should, in creative terms, itself be a bit mad: reckless and daring, stretching its source material to the limit and beyond.The production, starring the singer Nicole Scherzinger in a career-defining performance, opened Thursday at the Savoy Theater and runs through Jan. 6, 2024. I can’t imagine another London show generating comparable buzz this season.For that, credit the maverick director Jamie Lloyd, whose tightly focused, stripped-back aesthetic is on full view here. Purists may balk at a “Sunset Boulevard” without the visual splendor of Norma Desmond’s baroque Hollywood palazzo, as we have previously seen onstage and in the original 1950 feature film.But Lloyd’s streamlined approach has a power of its own. The cast as often as not wear contemporary street clothes — or sometimes not much at all — and rather than Norma preening in a turban and flowing garments, Scherzinger prowls the stage, barefoot and feline in a black slip. (Scherzinger’s sole previous London stage credit was Grizabella in a perfunctory 2014 revival of “Cats.”)Scherzinger finds a predatory allure in the character that is both captivating and chilling, and it is easy to see why the hapless young screenwriter Joe Gillis (an excellent Tom Francis) succumbs to Norma’s entreaties to help craft a screen comeback as Salome.Joe Gillis (Tom Francis) is the young screenwriter wooed by Scherzinger’s Norma.Marc BrennerOnce she has Joe in her grip and resident in her home, Norma can go in for the (literal) kill: a bloodstained finale of which Salome herself would approve. Keeping watchful eye on the pair are Joe’s girlfriend Betty (the sweet-faced Grace Hodgett Young) and Norma’s butler and ex-husband Max, whom the firm-voiced David Thaxton plays with a glowering mien that, you feel, the character learned from his former wife.The vocals throughout are impressive, and the lyrics’ cynical musings on Hollywood (“This stinking town”) are lushly served by the musical director Alan Williams’s orchestra. In keeping with the somber mood, more frivolous songs like “The Lady’s Paying” have been cut.Scherzinger nails Norma’s two showstoppers — one in each act — shedding sunglasses as she lifts the defiant “With One Look” to the rafters and beyond. That number’s second-act equivalent, “As If We Never Said Goodbye,” sung during a deluded Norma’s return to Paramount Pictures, begins plaintively, even tenderly, before building to a mighty roar. Scherzinger extends her long, sinuous arms in the direction of the audience like talons toward prey.The musical’s London premiere in 1993, and subsequent runs in Los Angeles and New York, were notable for a parade of Normas (Patti LuPone, Glenn Close and Betty Buckley, among them) and for a levitating set from the designer John Napier that was a remarkable engineering feat. Here, a different technology is at play, one suited to the Instagram era, in which everyone is always on show.Hand-held cameras spotlight characters at key moments, their faces projected on a huge screen that broadcasts every emotion (and facial pore). On Soutra Gilmour’s largely bare set, brilliantly lit by Jack Knowles, Scherzinger’s Norma is already impressive. But her image projected above us amplifies her sense of feral grandeur.The production includes handheld cameras that follow key characters around, and off, the stage.Marc BrennerNorma — who was 50 in Billy Wilder’s classic film — is now said to be 40, and was in her prime at 17. Showbiz discards personalities even earlier now, and Scherzinger, 45, who first came to prominence in the 2000s girl group the Pussycat Dolls, has a shivery command over a part that requires her to plunge headfirst into a psychic abyss.The restless cameras also zoom in on Joe, who is followed backstage and out the theater by a live feed as he sings the show’s sardonic title number before returning center-stage in precisely calibrated time for the resounding final note. Nathan Amzi and Joe Ransom’s video design pulls off a real coup with this sequence, though followers of the Belgian director Ivo van Hove will recognize the technique of folding celluloid into the theater.The prevailing intensity extends to the choreographer Fabian Aloise’s tightly drilled ensemble, which suggests a writhing, restless mass of Hollywood wannabes. And Aloise is gifted, in Scherzinger, with a rare Norma who can really dance, and who joins Joe for some sizzling two-steps — even, at one point, doing the splits.There’s fun to be had amid the show’s atmosphere of fury. As the cameras roam backstage, we briefly glimpse a life-size cutout of Lloyd Webber, and a shot of Gloria Swanson, the film’s Norma, playing on TV. The Noël Coward song title “Mad about the boy” is written in lipstick on a mirror in Scherzinger’s dressing room — which is one way of describing our heroine.But for all its nods to the past, this “Sunset Boulevard” belongs to the here and now. There’s not a whiff of nostalgia to the production, which takes an established musical by the scruff of the neck and sends it careering into the modern day.Sunset BoulevardThrough Jan. 6 at the Savoy Theater in London; thesavoytheatre.com More