Hi and welcome to the forum. There are quite a few posts on here covering the audio change.
Thanks for this, It's what I thought. I really appreciate your reply!Welcome, your audio-tech is basically telling you he doesn't know how to install a stereo system in a Jaguar. I suggest you source another tech to get it done properly. Upgrading the audio system in the X-Type is no more difficult than other automobiles with integrated navigation systems --even less difficult if you have the standard system.