I use Microsoft Outlook, which has a spam-reporting button.
It appears that when I report a lot of spam, VM email thinks that my computer is infected and sends me an email saying "You have received this email as one or more of your Virgin Media mailboxes has recently been locked due to suspicious activity being detected..."
The suspicious activity detector should have this email address whitelisted as a recipient:
abuse@messaging.microsoft.com
because it is used for reporting spam and so does not indicate suspicious activity.
There are other phishing/spam-reporting email addresses that Microsoft publishes, perhaps those could be ignored too - I expect the VM email security team knows more of them than I do.