As well as Mr Oliver and Ms Crimmin, the London leaders are: Stephen Howlett (chief executive, Peabody Trust); Andrew Morrison (regional director, B&Q); Elliot Lipton, (chief executive, First Base); restaurateur Philippe Castaing; Monica Saini of Christian Aid; entrepreneur Ife Piankhi; Professor Rick Trainor, principal of King's College London; community worker the RevRoger Gayler; Solitaire Townsend (director of Futerra Sustainability Communications); refugee activist Tzeggai Yohannes Deres; Mark Johnson, manager of London Warm Zone; horticulturalist Lutfun Hussain and urban ecologist Dusty Gedge.