Improve website Google ranking

Google SEO. Optimise [login to view URL] for 'surplus bearings'. For Google UK search, I have already optimised the site to the point it is on page 1. The position varies from number 1 to top 5 (see [login to view URL] for details). For Google Search World-wide, the site is listed on page 2 (see [login to view URL] for details). I can provide other .com domains for SEO if that would help. I am looking for someone with real Google SEO experience who will work with me to improve on what I already have. Despite my success, the site page rank is still zero. I would like to improve the page rank too. I want the site to consistently rank higher than a competitor with a Page Rank of 2. You must provide example of your achievements in SEO work. Payment on demonstrable improvement: ranking higher that competitor, improved page rank, listed in top 5 on page 1 for Google worldwide search.