if you type porn into google.co.uk you get a page full of porn results. So no, google.co.uk is not censoring porn results. Not yet.
If your question relates to whether the co.uk tld will get you higher on google.co.uk searches, the answer is a resounding yes, from personal experience.
I'm a British webmaster, I don't make a lot of co.uk sites simply because I don't think it has much of a future. Not much more of a future than the .de domain extension has.
However, the couple that I do have went straight into the first page of google.co.uk after 2 or 3 blog posts and a single back link. And they make me money.
But fyi, match.com want to get shot of adult.co.uk as quickly as possible.
http://www.t3.com/news/premium-domai...on-sale?=52857