I think he wants to stop the v+ remote controlling the volume on his tv altogether. In which case you could just enter a random control code for a different tv model. See here for details of how to reprograme your remote Virgin Media Remote Control Codes .
Just guessing here, but I think he wants to 'mute' the TV and prevent anyone (i.e. his wife etc...) using the v+ remote to turn it back up either by mistake or by way of circumventing his surround system.
Most TV's have a setting to choose external speakers so the remote would have no effect.
Luckily my Toshiba and my Onkyo get along just fine and the TV will happily divert the volume control to the Onkyo so when I use the Virgin remote to adjust the volume the TV then adjusts the amp volume.
I guess the other alternative is to use a Harmony remote or similar where you can tell it the volume is done by the amp and not the TV?