You have misunderstood
What I was saying is that Virgin have not altered the VoD iPlayer service. It works in the same way that it did before, and if content is missing then it's a fault. And by missing I mean showing up on the Catch Up listings here
http://tv.virginmedia.com/vtvapp/vod.do?demand=cup but not on the STB. Remember iPlayer on VoD does sometimes have 'missing' content compared with the online version due to rights issues and/or BBC content choices.
iPlayer on TiVo picks up the content from the web based iPlayer service, so will (because the BBC make it so) have more content available to it.