“You’ve brought the sun out!” says Sadiq Khan as he greets me on the rooftop of Boxpark in Shoreditch, east London. I quickly slake my thirst with the water provided by his aide but Khan does not. The Tooting MP and devout Muslim has begun fasting for Ramadan, abstaining from food and drink for 19 hours a day.
If Khan, who is 44, is low on energy it does not show. The former shadow justice secretary speaks fluently and passionately about his bid to become Labour’s London mayoral candidate and his vision for the capital.