We saw Valentino Rossi in the Mercedes a few days ago. You had some unusual drivers turn up in your cars, including Colin McRae. What is it like to run a car for a guest driver like that and is there any point in it?
Javier Rodriguez, via email
It's great to see a crossover between top sports personalities, as it gives them a greater respect for what others have achieved.
Rossi is no rookie when it comes to driving an F1 car, as he did a lot of testing with Ferrari and was even considered for a race seat, but I'm happy he didn't take up that challenge. For someone that is used to getting the best performance in a sport that is all about reading the signals that is coming through the seat of your pants, F1 is not all that different from MotoGP.
But finding that last second or even tenth of a second in any ultra-competitive sport is no easy task and he realised that. Having gone through all that, and the hardships required to achieve on bikes, he decided he should go racing and rallying as a hobby.