The US Anti-Doping Agency has stripped Lance Armstrong of his seven Tour de France titles, although there are questions over whether they can do this and banned him from professional cycling for life after the American decided not to fight charges that he used performance-enhancing drugs during his career.

How does the scale of the scandal sit within the Tour's long and sometimes controversial history?

Geoffrey Wheatcroft, author of Le Tour - A history of the Tour de France, gives his view of the scandal.

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