Virgin media is out to annoy paying customers, and we are not going to accept it. Here are some examples of people getting poor and contradicting responses on the matter of Steam being throttled by Virgin Media:
http://community.virginmedia.com/t5/Broadband-down-your-phone-line/P-ss-poor-service-when-using-Steam-on-Virgin-Media-National-ADSL/td-p/29814/page/8