Most definitely. Sites are subject to an approval process by Yahoo but as long as they are of fairly good quality with decent content they should pass. It is called Yahoo UK + Ireland after all.

Publishers can sign up at Welcome to Search123 Website - Search123 - A ValueClick Company. When you sign up just include the URL's you want to display the feed on and they'll be sent through to Yahoo for their perusal. Approval can take up to a week and of course there are terms and conditions for how you display the feed...