A minor point in the grand scheme of things but Virgin appears to have shifted their language slightly when nudging to upgrade from V6. It is now alluding to it 'eventually stopping working altogether'.
Still no dates etc. but will be interesting to see what happens next but have accepted it is coming
(for the second time as mine is a rare story of rolling back from TV360 - I wonder if that will break the upgrade)
"Your current Virgin TV box won’t be supported for much longer. This means it will lose functionality soon and eventually stop working altogether.
The good news is we can upgrade you to a new Virgin TV 360 box at no extra cost. But you'll need to take action to make this happen."