The success of London in 2050 will be measured by its environment. By this I don’t just mean the quality of its air, or whether it has retained its biodiversity, important though those are. I mean the overall quality of life for Londoners. Will they experience the city as spacious, efficient, healthy, and resilient? Or will they experience it as overcrowded, dysfunctional, stressful and insecure? The background to the question, of course, is London’s continuing…