Can you post a picture of the cable?
What type of connector does it have?
I gather some VM cable connections lack a wall box and are just a coax cable into the room (though I would prefer to have an isolator). You may be able to connect the cable directly to the hub, or use an adaptor/coupler. If you get stuck you may need to request a Virgin Media technician visit.
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I know a bit about Wi-Fi, Telecoms, and TV as I used to do it for a living but I'm not perfect so don't beat me up... If you make things you make mistakes!