I'm also having problems obtaining my new box, the phone team don't seem to understand what letter says and the online link, which I would prefer to use, doesn't work.
People are saying that, once I manage to get the box, it has to be connected to the hub, can this be via WiFi? - the hub is upstairs but the v6 will be downstairs
It can be via WiFi, but this is not the preferred connection method, as many (including me) have found it inadequate due to local WiFi congestion. A 5Ghz connection is pretty well essential for any HD & internet streaming. If the signal is not strong enough then you can get Powerline adaptors from VM to turn your house ring main into a network.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.