For decades, we have been told that working longer hours is the only way to grow the economy. But the data from the UK's massive four-day week pilot tells a different story. Shorter hours lead to more focused work, lower burnout, and higher overall output per hour.

It's time for the UK to lead the world in a radical rethink of the relationship between time and value. Productivity is not about endurance; it's about intensity. A rested workforce is a creative workforce, and in the AI era, creativity is our only remaining competitive advantage.