I have no idea about SEO company in UK. There are many SEO company available online. Among them, i would suggest to you get the SEO service from XnYnZ.com
here they provide Search engine visibility service which bring traffic to your website. Here they provide you One-click submission of your site in many search engines like Google, Yahoo!, Bing, and AOL etc... and they also provide Powerful reports that show you how to move your website up in search results. It is an International provider.