Provided that the email account concerned is attached to your current VM broadband account then you will probably be able to regain access to the email addresses by changing the passwords.
Sign in to My Virgin Media, go to My Profile and/or Manage Accounts depending on whether the account concerned is your primary account or an additional one. Select the account concerned and then click on Change to the right of password if a primary account or View/Change then change to the right of password for secondary accounts.
If that hasn't unlocked your email address after at least 30 minutes then post back and the VM Forum Team staff should be able to help you when they reach this thread.
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I tried that this afternoon (having read your reply to someone else) and it didn't work... just tried it again; and it did! Now I just have to plough through the 40 or so work emails that all wanted a reply ASAP! 🙂