http://www.pipex.net/legal/changes-faq.php
apparently as reported in ADSLGUIDE, Pipex are now managing their traffic.
"...The User acknowledges that the availability of their PIPEX Service is also dependent upon reasonable usage of the network. The User further acknowledges that PIPEX reserves the right to manage the Traffic of those Customers whose usage PIPEX considers to be either not consistent with or appropriate for the Service to which they subscribe or detrimental to the other Users who share the network..."