Christian Wolmar is an award-winning author and broadcaster specialising in transport. He reached the short-list of potential Labour candidates for the 2016 London mayoral election.

His many books, including a history of the London Underground, one on the Trans-Siberian Railway and his recent book on Indian Railways, and his trenchant and stimulating articles on transport and transport policy, provided a base for his campaign that took in many wider issues. It also proved the worth of creating a digital marketing campaign on social media nad Christian went on to fight the Richmond by-election.