Keir Starmer could not have chosen a more sobering moment to make his point: Britain’s nuclear deterrent is not some dusty relic of the Cold War, it is the vital, ever-present frontline of our national defence. As the Iran crisis dominates headlines, his warning about Russia must cut through the noise. Vladimir Putin does not pause when the world is distracted; he presses on. Britain cannot afford even a second of complacency. Now the Mirror’s rare access to a Vanguard submarine lays bare the