Form some time I have been signing up for online mailing lists with addresses related to this domain. So if I sign up for a promotion with argos for instance. I'll use the email address as argos@[thisdomain].com
My idea was to see which unscrupulous compay (or unscrupulous company acting on behalf of a legit company) sold my email address on.
The outright winners are Marks & Spender and 192.com, I get more spam from these two addresses than any other companies.