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>can someone help me understand what it is i have done to get this traffic?
If your site has been around for 4 years, that would be part of the reason. I would also guess you have a lot of good content and/or many incoming links.
>Also how can i get on the first page of google for the keywords uk used cars and used cars uk.
AdSense:) Otherwise, make WebmasterWorld your home and read, read, read. It's well worth the investment. Maybe start with the 'library' links at the top of the page of this forum, the Link Development forum, and the Content, Writing and Copyright forum.