An update. I spoke to Navtv who do lots of this kind of thing and they can make something work quite well. However, there is a bit of a compromise. Everything looks and stays the same, all the original buttons work as factory fitted, the compromise is if you want to use your phone, which will be plugged via a cable, you will need to use a switch, which they fit, to enable you to display what's on the phone. It means that the phone becomes the controller not the Jaguar touch screen. The cars screen will display whatever's on the phone. The kit costs around £300 plus fitting. Have a look at Navtv based in South Wales