Testing doesn’t get any more challenging than this. Get a look at the making of one of the toughest challenges we’ve ever attempted as the Range Rover Sport tackled the gruelling Inferno Mürren downhill ski course with Ben Collins, formerly the “Stig”, behind the wheel. 14.9 kilometres of severe terrain, descending more than 2000m on a gradient of up to 75% over ice, loose rock, mud, broken asphalt, grass and gravel.