Google Dance

Could someone please please help me......
My web site is www.onestopcaradvice.co.uk which is a uk automotive directory. Sine the google change my site has dropped of the rankings.
after spendng many hours tinkering with it, i am still none the wiser. In the google dance if you type in "second hand used cars" i am showing as number 1 on the www2. and www3. however once the updates go through to google.com and google.co.uk i'm no where to be be seen.
Why is this....am i tripping the spam filter?

Technically, there is no such thing as a secondhand car under UK law - I think they are now either pre-owned or second user or some such jargon. Interestingly, you are ranked in Google for the following:-

#77 second hand cars
#19 second hand cars uk

so all is not lost. Hope this helps.

Nick