"It's not like you're doing Muhammad Ali," says Jonny Lee Miller, speaking about his portrayal of British track-cycling star Graeme Obree. "It's not like everyone knows who he is, or what he's like." 

Indeed, even in his homeland, Obree - the subject of The Flying Scotsman - is hardly a household name. But in the 1990s, the Scottish bike messenger and family man broke world records on a bicycle he built from spare parts. And his controversial riding style and aerodynamic positioning had a huge impact on the sport.