Formula 1's governing body the FIA brought in new regulations in 2009 in an attempt to make racing more exciting by increasing overtaking.
Brawn GP concentrated on a section of the car not covered by the new rules, adding an extra hole in a diffuser at the rear. That meant they got more downforce - and therefore more grip on the track - than the rules intended.
As Brawn explains in episode one: "When teams start to look at the design of the cars, they see problems and regulations, or they see opportunities."
Rival teams protested to the FIA, but the so-called 'double diffuser' was ultimately ruled to be legal., external
Former Formula 1 CEO Bernie Ecclestone says in episode two that "all the teams, then and now, read the rules, in a different way".
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