There's also a http download cap which operates 24 hrs on a single thread download. So basically although speed test shows say 200mbps you'll between 70mbps and 90 mbps depending on the time of day. Using more than a single download you will reach maximum speed.
Virgin originally said this was by design which is probably true as it's a way of limiting traffic in a oversubscribed network. Then under pressure decided to investigate it. They have since gone rather quiet on the subject. There's 25 page thread on it here
https://community.virginmedia.com/t5...026879/page/13
A few people are unaffected I'm not sure whether the gaming bundle has this limit or not.