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This weekend sees the start of the British Superbike Championships. These specially modified production motorbikes are loud, fast and seemingly dangerous... A new documentary, "I Superbiker Clash Of Nations" charts the thrills and spills of the sport. Director Mark Sloper and one of its stars, racer James Ellison, told Sportshour's Caroline Barker just how his body has suffered for his sport! Photo: Motorsport rider James Ellison reacts after crashing (Credit Robyn BeckAFP/GettyImages)