Documentary filmed over the course of a year going behind the scenes on the London transport network as it undergoes a £10bn modernisation programme to cope with record demand. At Earl's Court station, Charlotte controls the Piccadilly Line, one of London's busiest, oldest and most unreliable lines, while new recruit Naeem faces furious passengers at Bank station when a strike hits the network. Tino from the special requirements team is sent to Highbury and Islington to deal with one of the Tube's worst nightmares as rush hour coincides with a football derby.