I know 
1). Create a /uk/ folder (or uk.example.com subdomain *better*)
2). Create HTML pages for your pages like this:
EG:
Code:
!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Strict//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd”
html xmlns=”http://www.w3.org/1999/xhtml” lang=”en-GB”
And meta:
Code:
meta http-equiv=”Content-Language” content=”en-GB” /
(*Dont forget to add “<" and ">“).
Create XML sitemap and ping Yahoo and Bing 
***** Get some links form .co.uk websites.
Wait a few weeks