Overture UK, like the US version, has been bought by Yahoo!, but it still has the great affiliate marketing features that it has become known for.
They are here: www.overtureuk.com

Their big claim is that they will help you reach 80% of all online UK consumers by submitting your ads to Yahoo!, MSN, Wanadoo, Lycos, FT.com, and Ask Jeeves.

It’s a fast and easy way to get a whole lot of exposure for your site. If you bid high enough, you can get your ads within the top three listings on Overture and that gets you into Overture’s partner network. This is highly desirable because it will bring you tons of targeted leads.

To get started, look over their info, choose your search terms and start bidding. The big downside to all this, of course, is that it can cost lots of money. Unlike Google, Overture’s ranking relies solely on PPC bid prices. Of course, you may get lucky if you’re in a category without a lot of bidders, so it’s certainly worth taking a chance.