[MovedGoalPosts]

Cable TV and broadband feeds share the same connection via the splitters, so yes in theory change the cable length and you can relocate kit. Just be very careful. The wrong type of cable, a poorly formed connection and you'll degrade your own signal and potentially that of your neighbours. Even just changing the cable type or length can affect the wiring resistance and thus cause you problems. It's why in the VM terms of use, cable prior to your set top box or modem is for Virgin Media, not the customer to maintain.