I assume you are referring to www.sitesaversonline.co.uk?
It would appear that the website name is no-longer registered.
For whatever reason, the re-registration fee was not paid and the site has fallen into disuse and as such is available for anyone else to register.
We transferred the billing for hosting last Nov from my sons account to mine and in error they cancelled the domain name instead, its took us nearly three months to get hold of them and they deny we had an account with them. We pointed out we were actually "there" and just wasn't receiving billing etc. They promptly deleted the site rather than admit their mistake and put it right. They have answered no telephone calls, no emails and weren't interested so when it became due in the middle of all these problems we refused to pay a company that we couldn't get hold of. Instead we have set up our own server and will be hosting it ourselves- at least we can get hold of us if things go wrong! The site will be opening later this week at the moment it is being thoroughly tested for errors. Please stay tuned at http://www.fundraisingquizzes.net/