Found it under here:
http://abcde.co.uk/virginmedia/broadband-faq.html#q48
I think VM are so stupid to put STM on it because I remember Neil, the boss say there will be no STM on our superfast 50Mbps because you pay for the premium service ! So, if the STM come in, then it a big blow for many of them who fork out £50 a month for rubbish and misleading superfast of premium service. This is totally wrong !