Mine was £470 fitted. Detachable Westfalia would have added £80 for the bar + £70 for the new diffuser. Other brands may be cheaper and/or a better option for a V70.
Edit: Mine is a Westfalia swan neck with Westfalia dedicated electrics for the MK7 Golf. They needed to remove the glovebox and some internal trim to route the wiring loom to the computer at the front of the car, where it plugs into the factory socket. Generic wiring is spliced into the wiring in the boot, so is a fair bit cheaper. However, I get a picture of what looks like an Eriba on my screen when I'm reversing with the van!! Also, the parking sensor is disabled when towing and the bulb failure system takes the van lights into account (apparently). All in all, I'm glad I went for the dedicated wiring loom.