This year, London's elected mayor and assembly turn twenty. But has London's mayoralty lived up to the expectations that were set for it? Have its three mayors been able to get to grips with the city's challenges? How have they responded to crises in the past – and what does the future hold? This important new book marks the twentieth anniversary of London's mayor and assembly and investigates the relative successes and challenges of the mayoralty to date, before asking what comes next for London. It combines analysis by experts with reflections from those closely involved in setting up, running and working with the Greater London Authority, alongside those who have held the position of Mayor of London themselves.