Hi, I have a UK site on a .co.uk domain name. Becuase the site has exactly the same design as the site on the .com domain, but has different content, I am thinking that I may have to move it to the .com domain and just make a sub domain like uk.prods.domainname.com Would it mean that Google.co.uk will de-index the site from the UK search engine even though it is a UK site on a sub domain with a .com?
if the content is more than...say 70% different to the .com version then leave it on the .co.uk. Because it's on the .co.uk TLD it will get into Google.co.uk, and also hosting with someone with a UK IP helps a lot too HTH
If the .co.uk domain is targeting the UK marketing, and the .com is for the US or international, then I'd keep them separate or set a redirect from domain.co.uk to uk.domain.com to keep it all in one place. Yes, you're likely to lose google.co.uk indexes if you do that..
If you move the .com to a UK server then you will be able to get the google.co.uk listing. As its a .com it will still remain listed in google.com although I'm not sure how much (or if) it will effect your SERP rankings as Google looks both at TLD and hosting location.
keep the .com in where it is as thats targeting US people I'm guessing? and either leave the .co.uk where it is and it will do reasonably well in Google.co.uk or get UK hosting for it for maximum effectiveness