Plot: As the contest to be crowned 'best workplace choir' continues, choirmaster Gareth Malone enters the embattled world of high finance, high flyers and rock bottom reputation at one of the biggest investment and trading banks in the world, Citi, in London's Canary Wharf. After imagining long lunches and cigars, Gareth finds himself in a lockdown during an anti-capitalist protest, learns how many noughts there are in a trillion, and creates his most musically accomplished workplace choir yet