Have you plugged out the CD changer R41 next to the navigation dvd J401?
Sorry, that got missed in my original post.
R41 has been unplugged in the past so that a Denson Bluetooth Unit could be fitted in its place. And Yes, I have unplugged the aftermarket "Denson" Unit
And also disconnected every thing on the dropdown below the parcel shelf in the boot.
I will pm the VIN to you later today.