Concerning the restoration of emails, as far as I know, if emails are not found within your mailbox on the server then they are unrecoverable, i.e. Virgin Media do not keep backups so have nothing to restore for individual mailboxes. To check the content of your mailbox either sign into webmail or use an email client configured to use IMAP and SMTP.
FYI: be aware that mid-2015 Google terminated their email service for ISP resulting in those emails appearing under [Gmail] folder. Should you not see this folder in webmail then try the following:
- select ≡ > Settings > ▸ Email
- select ▸ until all folders views are expanded
- confirm all folders are selected (☑)
- select Save
- select Email located top left and then Ctrl + Shift + R
If [Gamil] folder was not found in step 3 then no emails before mid-2015 are present in the mailbox.
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