Ever since he was a child, kicking broken footballs on the streets of East London in the shadow of Canary Wharf’s skyscrapers, Gary Stevenson wanted something better.

Then he won a bank competition and a position as the youngest trader in the City, a place where you could make more money than you’d ever imagined and your colleagues are dysfunctional maths geniuses, overfed public schoolboys and borderline psychopaths yet start to feel like family. Stevenson talks about dealing in a trillion dollars a day, and how it felt as he realised the wealth of a few depended on millions becoming poorer and poorer. Stevenson talks to broadcaster and presenter Rebecca Jones.