I have discovered that my Moto 4+ does not support Mirrorlink.
I have also purchased an Android auto gizmo on Ebay but I then disco that Lexus are one of the manufacturers that does not provide an upgrade/link for it.
It looks like I will not be able to project my mobile phone screen to the car 7inch screen. Rather disappointing. I don't want to upgrade the head unit on a new car, I would have thought that Lexus would have kept their IT/infotainment up to date.
I have managed to link Android Auto via Bluetooth to get music, phone and Google maps voice directions through the Lexus head unit. I suppose I will have to settle for this.