It was not until I started racing for car manufacturers that I found a car I could really get attached to. I am the son of a car dealer, so up until then, cars just came and went.

I don't do much driving - about 5,000-6,000 miles a year. And most of that is to the airport and to the racing circuits.

I clipped a Ferrari, hit the gravel trap at a fair old speed, which lifted the car up into the barrier, and then rolled a few times. I had no injuries or anything - I just had to wait for the marshals to right the car before I could get out.

Especially with sports cars, when you have got so many cars on the track with various degrees of competitiveness, then something will happen. It's the nature of racing, the law of averages. If you want to be a front-runner then you are going to have to push very hard, and collisions can happen.

I have been waiting to win a world championship since 1985. I've had three cracks at a world title - in karting, I finished third at Le Mans; that hurt because it was very close, but then in Formula One there wasn't really an opportunity to finally crack it, so it's third time lucky.

My very first car was a grey Alfa Romeo Alfasud, which I got in 1987. But, in our family, all cars were for sale - so they might be there in the morning and were gone at night. In the mid-90s, I joined Porsche and the Carrera was the car, and the Carrera 4S was the one they gave me. As a wee boy from Dumfries, I couldn't believe it.

The main factors in terms of how tiring a season can be are governed by the number of races and the length of time between the first and the last.