I'll assume you actually own a DVB-C compatible tuner.
• First make sure you have VM BB/TV or a active VM cable.
• If so, good. Get a F-Type to Coax adapter and attach it to the end of your VM cable.
• Hook it up to your DVB-C tuner.
• Once hooked up, head over to Menu -> System -> Service Searching -> Tuner Configuration
• Click on your DVB-C tuner in the list
• Put tuner type on DVB-C,
configuration mode: enabled
Network ID : (yours)
Used service scan type : Provider
Provider to scan : Virgin Media (6952)
• This will have the tuner set up. Then just go to System -> Service Searching -> AutobouqetsMaker and select "Start Scan"
• Let it scan
Channels should now appear scanned. Let me know if you need EPG help!