On the 50th anniversary of Jochen Rindt becoming F1's only posthumous World Champion, we speak to those who knew him well - including Sir Jackie Stewart and Helmut Marko.

1970 was the year of transition in Grand Prix racing; the season that pitched the old guard against a feisty new breed of racers intent on pushing Formula One forward into the new decade. Nothing symbolised this battle more than the cars used by top contenders: Jacky Ickx’s Ferrari 312B relied on brute force to compensate for its outdated styling, whereas Jochen Rindt’s Lotus 72 showed that radical aerodynamics represented a brave and (potentially) faster way forward. And with the technological battles came a fascinating season’s racing. Jackie Stewart was the defending champion but took nothing for granted. When different drivers won the first four races, Stewart, and the world, knew that the Championship was wide open. Thrilling battles ensued until triumph and tragedy came together in one fatal collision: on the 5th of September 1970 Championship leader Jochen Rindt died during practice at Monza. He was to become the sport’s first posthumous champion.

The most daring drivers in the world have gathered to compete for the 1966 Formula One championship. After a spectacular wreck in the first of a series of races, American wheelman Pete Aron is dropped by his sponsor. Refusing to quit, he joins a Japanese racing team. While juggling his career with a torrid love affair involving an ex-teammate's wife, Pete must also contend with Jean-Pierre Sarti, a French contestant who has previously won two world titles.