You can pickup the feed from the rear camera from a connector in front of the passenger seat next to the center console at floor level. Red and white video, black 6V power to camera and shield, this will save you a few ££'s. If you need a 12v trigger for the HU the loom in the passenger foot step has the thin red/white feed to the reversing lights, there are several red/white wires in the loom so a bit of work with a meter and sharp pin is required. The front camera I have yet to investigate where the feed comes into the cabin.