There is one thing that might give you some comfort. If you don't access the address in any way for 150 consecutive days VM will close it for e-mail purposes but it will still be valid for My Virginmedia sign-on etc. You can then use any other e-mail address for your day-to-day transactions. Remember to change your contact address for VM communications in MY Virginmedia or you won't get bill notifications etc.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.