Well Nunns have sorted things out: they arranged for me to bring the batmobile in today to fit a new relay for the rear foglight – it switches to the trailer when the towbar electrics are connected and back to the car’s when it’s disconnected – and a different iPod integration module following Nunns’ discussions wit Mazda Europe.
And lo and behold, it works with my old iPod as well as my new “RexPod”, displaying track number (from the playlist) or artist or track names.
Result!