In 2024, the NHS began testing whether flying drones could do a better job than couriers shuttling blood samples between labs in Guy's and St Thomas' hospitals. Instead of weaving through traffic, the drones simply lifted off, crossed central London, and landed minutes later. Delivery times dropped to barely a couple of minutes, reliability shot up thanks to a lack of roadworks in the sky, and the service turned out to be cheaper too. Since then, more than 6,000 samples have been transported by air.