The BBC have to format their shows to fit the customs of different regions. Top Gear is an hour show from beginning to finish. If they were to play it unedited here it would be an hour and a half long to make time for said commercials. Also you will find that the music in Top Gear changes from region to region. (Trust me, you want the original UK aired versions)
haha season 13 has been out for a few weeks now. I'm about to introduce you to your hard drives worst nightmare...the torrent
http://www.finalgear.com/