I have seen a few people complaining about Virgin Media on the official forums lately, pretty much since the start of this reset. They seem to have low-medium latency but are lagging, much like myself!
But what I was wondering was if you are having these problems aswell, are you also having problems out of WoW? Only a few days ago I was able to run WoW, mumble, several internet pages and watch live streams at 1080p no problem. Yet now I am struggling to run a stream with nothing else open and its only at 480p...