I've just tried it
in the evening (20:30) when its "throttled to buggery" . I'm on Virgin's L package which is supposed to be 10 meg.
Thinkbroadband measured it at 9.5 meg down, 400 k up, which seems OK to me, certainly pretty much what they said it would be. Now, I'm no ntl/Virgin apologist by a long chalk, but people won't take your criticisms seriously if you just seem to hate Virgin & thats it, in the same way as a serious critique of the Labour party probably wouldn't contain references to 'Bliar' or 'NuLabour' etc.
My problem with virgin is that theres an obvious lag between the mouse click & starting a page download, thats probably them doing their packet inspection or the like - its definitely noticable compared to other ISPs, regardless of download speed.