You may have seen that most of you are disconnecting from the server every 30mins to 1hr. This is due to the latest firmware update to the Superhubs, Superhub 1 and 2ac's do not have this issue, only the Superhub 2s do. (v 2.01.03)
The firmware has traffic shaping in it which at the moment thinks any type of streaming or online game play through non-normal protocols is torrents and it kills connections for a millisecond.
There is a way around it, if you have a spare router available (please don't go out and buy one you shouldn't have to do that), put the superhub 2 into modem only mode, and connect a router to the hub when in modem mode, this will allow you to play away to your hearts content.
Unfortunately Virginmedia 2nd Line staff either don't believe you, or they need "proof" this is happening, but since this issue effects pretty much nearly all MMOs and streaming sites and they all show the same symptoms, their cries of it is not us it is them is moot.
So if you are affected by this issue, and you don't have a spare router, call them up and give them hell about it, perhaps with enough people complaining they will finally do something about it quick.