How much impact does positive visualisation have on performance? Roy Skillen examines the effect of this powerful process using examples of some of sports best performers. Sydney Australia, 21st of November 2003. Jonny Wilkinson stands 40 yards out lining up a penalty in the dying seconds of the Rugby World Cup Final. England trail by one point and this is surely their last chance of claiming their first world crown. But rather than showing any sign of nerves there is a confidence about his stance,…