As I understand it, you need the Virgin feed to be 'live' to be able to use it. That is, you need something like Virgin broadband running already. Even if you have an old Virgin connection, it's no good if you don't subscribe to any of their services. I doubt many of those with Sky line will be willing to pay the minimum package each month to get that Virgin line in and live.
IPTV can be decent but you have to find the right service. I've been trialing a few and the variation in quality is massive. One provider's 'HD' channel's were so obviously a stream of a stream of a stream it wasn't even SD quality in the end.
they do if they are new builds.
virgin have been known to install lines at the point of buidling, and they won't have a service on them at that point.
Really? ... If they're building a new estate for example, I can understand them cabling the street whilst the groundwork is being sorted but it doesn't seem very cost effective for them to send the engineers / technicians back out to put a terminal into every property without getting anything out of it.