Cheers guys.
When I plug in the iphone the head unit starts to beep intermittently, and keeps beeping. I can't get it to play using any functions on the stereo. I have the Bose setup.
I need to find where the wires go, but it's a tidy install and they appear to tuck straight up the mounting bracket out of the top of the glove box.
I will give the FM a go later, but due to the stereo beeping I guess it's plumbed in somewhere. I reckon it's for older i-devices.