Found the fuse box today (thank you jbi507) fitted the piggy back fuse and earth all good, rooted the wire, very easy up the collum then under the head lining to were I was going fix the camera which was to the left side of the mirror, all done very neat no wires on show, all worked to ignition.
only problem it looked like a bag of crap, with the screen angle the camera hangs down right in the passenger line of sight and below the mirror so in total view when driving, so i striped it out and booked a web cam from Lexus, there model looks a far better, neater option than an ugly bolt on.