They are dead easy to use, I use Azureus http://azureus.sourceforge.net/

Once you've downloaded that go to either mininova and search for Top Gear or go to http://www.finalgear.com/shows/topgear/ (which isn't working for me at the moment) and click on the episode you want. That will then link you to a new page. Click on the link here



That will then open azureus and you need to click on the 2 ok buttons and wait for it to download