He does Mk3 CDs as well, not sure of how much extra function is added to them. The early l322 RR satnav is not renowned for being particularly good. You should be able to swop it out directly with a Mk4 though - remember the BMW X5 takes the same kit - they pop up on ebay regularly (usually advertised for X5s though, not Rangies) and are probably worth the upgrade as you can load UK and Europe in one go, get full post code entry and Voice Activation as well. Worth contacting Mick. The upgraded discs are cheap.