McLaren Automotive: Jenson Button on the open top driving experience

Jenson Button is a man used to excitement behind the wheel. But what does speed mean to him? How does he feel driving at a blistering 300km/h, open to the elements all around him? We ask the F1 ace about the sensation of speed, the emotion of driving. But is he talking about his MP4-27 Formula 1 car or the 12C Spider?