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BMW and Williams paired up in Formula 1 at the start of the 21st century with sky-high ambitions, yet after six years the partnership was over.
During that time Williams had only one meaningful shot at the championship, and in the end BMW became so frustrated it bought Sauber.
So how did it go so wrong? In this video we look at the key reasons BMW Williams couldn’t make the step from decent frontrunner to world championship-winning force.
Let us know on social media what you think caused this partnership to fail.