[Rob]

Why do people insist they need to clone the mac address of a registered PC into a router to get the modem to router connection to work? It's not necessary.

This was only of benefit to the users of Set Top Box connections where the specific connected device needed to be registered with the Virgin Media servers. With a modem connection it's the modem only that is registered so it doesn't matter what device is connected to it computer(s), router or console (just one at a time though).