Who's driving this car?

This guy stops at various points on the Goodwood hill climb, and does donuts. Then, as the car continues to do donuts, he climbs out of the driver's window, and jumps out of the car. In this shot, he's just heading back to catch the car. He locks the throttle and steering before he climbs out...

Probably not something to attempt on the m25 at rush hour, but fun to watch.