Gary Stevenson grew up in Ilford, east London. He was expelled from school for selling drugs. He tried to start a grime music group and worked at a sofa shop next to a sewage works.

That doesn’t sound like your typical banker. In many ways, that’s the point of Stevenson’s book, The Trading Game, on how he became a trader on Citigroup’s short-term interest rate desk and raked in millions.