Happy days!!!! - Thanks to jokiin (You Sir are a Diamond Geezer), your hunch was absolutely spot on. My F800 pro was wired wrong via the Power Magic Pro module left over from a previous Blackvue install hence the reason why it was not going into Parking Mode. Had the old wiring and the module removed and had the F800 pro hard wired via the internal fuse box, all the functions are activated as specified. I now plan to install a Celllink B power pack as I am slightly worried about power drain on the stop and go system of the Lexus but at nearly £200 a pop, I'll have to buy it when the wife is distracted - lol.