[Kushan]

I believe (but could be mistaken) that Netflix uses adaptive streaming to match your connection speed, so if the speed isn't good enough, it drops the quality on the fly. So with a new speedy connection, that shouldn't be an issue.

The service you get from Virgin can depend on your area. If your area is congested, it can be as bad as your connection is with Sky, but if you're in a good area then you'll be fine and get full speed most of the time (until you get traffic managed).