I know 
1). Create a /uk/ folder (or uk.example.com subdomain *better*)
2). Create HTML pages for your pages like this:
EG:
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 