Rishi Sunak and Sajid Javid, Britain’s finance and health ministers respectively, resigned yesterday; other officials soon followed suit. Once again, questions about Prime Minister Boris Johnson’s political survival are swirling. A ride on London’s sparkling but quiet new railway line hints at the complexities of post-pandemic public transport. And how off-the-shelf drones are making a difference in Ukraine’s war. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer