Admiral Hosting in London

We were contacted by Admiral Hosting in London to rent some our unused IP space. While they insist that they're not spammers, we can not find out much about them. Has anyone had any dealings with this company? Legit? Scam? We are not interested in contributing to the Scam/Spam problem and figured I would ask here. As this is not, technically, NA-related, private replies are preferred. I'll summarize to the list.