The 24-hour city: London, UK

As investment in the night-time economy rises, we look at how this is working in London. Is anywhere else doing a better job? Presenter Fi Glover returns with two new panellists to analyse and critique the best policies from global cities: Dr Ellie Cosgrave, Director of UCL City Leadership Laboratory; and urbanist Professor Greg Clark. The team scour the world looking for the most inspirational cities, from those tackling environmental issues and urban violence, to encouraging political participation and transforming slums. Are they models other cities should follow? Image: The City of London at night (Credit: Neil Hall/European Photopress Agency)