Hi Steven,
In the end I ended up calling Customer Services to be told that as result of a planned security sweep my IP address reported suspicious activity. Virgin then locked all my mailboxes not allowing me any access.
Whilst I appreciate the precaution, not allowing me to take action to remedy the problem but just sending an email to a locked mail box was not helpful.
Customer services unlocked my mailboxes and we are now back to normal.
Regards
Mustafa