You don't really think that was shot against a green screen do you? Have you ever read any of Jeremy's writing? Have you ever seen Top Gear??? Besides, there is a characteristic quality to edges on a green screen that never lives up to real life shooting. That was most certainly not an overlay shot.
I know Top Gear. I know Jeremy's writing. I still think it's a greenscreen shot. Top Gear broke every "rule" with the Aston film (no "bombshell", credits running over a moving image, Jezza not screaming "power..."), so why should the not use a greenscreen, too?
We're talking about the camera movement ca. at 58:15, when the camera pans across the dashboard to Jeremy's face and then again around 58:55, don't we?
The "characteristic quality to the edges" only appears if your lightning setup is sloppy. Apart from that, there's one main reason why i think it, in fact, is a greenscreen shot: quite exactely at 1:00:00 you see that the car, according to the speedometer, is moving at exactely zero mph.
The transition effect could have been possible by "masking" the window area and replacing the scenery in post production instead of using a greenscreen, but the zero mph reading from the speedometer is a dead giveaway
. Additionally, as one of the transitions occurs while Jezza is in the picture, you'd have to mask every single frame of the transition cause Jezza's a moving object, not static like the dashboard. Lots of work here, and CGI guys' hourly rates are horrible. Greenscreen is the easiest and most elegant way here.