I have emailed Virgin and all they would say was:-
"Thanks for your email to Virgin Media regarding your query about 2012 switchover. Unfortunately we are unable to answer your query, hence we won?t be able to look into this matter just yet." (sic)
What that means
who can say?
I live in New Ash Green which was re-cabled for analogue TV by NTL's predecessors when the previous Rediffusion cable system ceased.