Kindly Advice me!My site has PR 6 site but NO Traffic

[ben1]

Greetings to all!!

I’m kind of confused. I have an ecommerce website, say Example.co.uk (targeting for UK visitors) and it has PR 6 at the moment.
Well...I've been thinking why I am not getting any good search ranking for my site. My site has a good number of quality back links and my competitor site has lesser back links, but still they are getting good search ranking but why not me, they also have a PR 6.
Is it related to something difference with SEO for international website? Is there anything that I can do to target UK customers?
OR my product page has more no. of back links than my home page. Is this an issue?
Will it make any difference?
I mean though I have PR 6 and good quality backlines I don't know really
Why my site is not having a rank in google.co.uk search? But my competitor’s site being PR 6 and lesser back links than my site, they rank on 1st page of Google search.

Any SEO Experts can give a valuable info???
Please help me at the earliest. Thank you!

Cheers
Ben