The voice and phone modules, are interchangeable between X, S and XJ. All the modules in the boot use the d2b network, thats how they communicate with each other. Bluetooth came out on Jaguars in 2005.5MY, so 55 plate onwards will be bluetooth compatiable. You'll more than likely have to re-pin the red/black plug in the centre console for the bluetooth module. Make sure you get the correct phone module, must end in AC or above, as GSM phone modules are not compatiable with bluetooth.