The first car I ever designed was for Peugeot, but the nature of this business is that you design lots of cars that people never see.

They go through competitions and then different designs are selected. The car itself was a Peugeot 406 proposal but it didn't make production. No one's ever seen it.

The first car I owned was a dark Volkswagen Beetle. It never made it on to the road. I bought it when I was studying industrial design at Napier University in Edinburgh with the intention of fixing it but it never quite happened. It cost £50, which sounds like a bargain but it wasn't. I sold it for £20. It was the worst car I owned. Another terrible car was a Ford Orion diesel, though I shouldn't really say that. It was very slow.

The future of automobiles is change - we're at a turning point. Throughout my career as a designer, cars have ostensibly stayed the same. New names will come to the fore - Google, Tesla, Apple - and new technology will allow for autonomous cars.

One of the issues we're dealing with is that over the next 10 years there will be twice as many people in the world that can afford a car. These people - two billion or thereabouts - mean that congestion must be considered especially in places like China and South America. The future might not be the traditional car. It might not be the traditional way of owning a car. Dumfries probably doesn't have to worry about that quite yet though.

Some of the cars I've designed in my career are similar to the drawings I did as a child. One of the things you learn is that you go in to it because you want to design cars for yourself, but you realise that you need to design cars for other people. But my tastes probably haven't changed that much.

The latest car we showed in Detroit, the Ford GT, is my favourite. It's a super-car, a once in a lifetime experience. I'm pretty happy with that one.

The last time I got a bus was four or five years ago, which is a little embarrassing. I drive a bright yellow Ford Mustang. I sing in the car, though not very well. There's a lot of sixties rock and some traditional American folk music on when I'm driving.

Beautiful cars are a matter of taste. There are ugly cars that everyone will agree are unattractive, and then there's cars that I think are ugly but people are still buying. That annoys me, because I want to understand why they're being bought. My wife's American and she saw a Citroen Diane in Italy for the first time recently. That's up there with worst, but I can see the inherent charm in the design.

The UK and US aren't too dissimilar in terms of car culture. They're the two countries when owners tinker the most with their vehicles, though the sense of scale is different. The US makes it easy to own and collect old cars, and there's a lot of romantic history imbued in the scene.

My brother is the design director for Jaguar. My designs are better. Ian and I are proud of each other and it's helpful that we don't work on exactly the same products. We actually have similar tastes but by definition my designs are more pragmatic and family-orientated and his are sportier.

I get back to Scotland quite often, two or three times a year. Out of everything I miss the roads the most. Those nice winding roads are fantastic to drive on. And the hills - Michigan's quite a flat place.

Moray Callum spoke at the unveiling of the Ford GT in Milan. The car will be on general release in 2016

Gabriella Bennett