Ed, did you happen to watch this on BBC America? If so, the episode is from several years ago. I'm a Top Gear Fanatic, and have tons of episodes on my computer (the real ones from UK TV. It is BY FAR, the best car show EVER). The best place to get the "real" episode is a website called FinalGear.com. And to watch them, you have to have a bit torrent program.
A good program is Bit Comet. Its a free program, and easy to use. You download the bit torrent file and then watch the show, as shown overseas, with no commercials. You even get to see the "Star in a reasonably priced car" (sometimes they don't air them). Just remember, when you do download the show, it can take a few hours to do, as you are getting the shows via a seed from other computers. This way, Finalgear.com doesn't charge a dime for any of the episodes. No bandwidth to use up on the program files. If you have any questions, feel free to ask. I download the newest episodes every Sunday around 6 pm EST, during the seasons (spring/summer and fall). :cheers