Neil, I've been working on preciciely the same conversion. Bimmernav sells a kit to do exactly what we want using original parts but it's pricey. A couple of smart guys like us can certaintly figure it out. So I got a UTF to try but when I plug it into the factory plug it freezes the satnav etc. I have heard that the Range Rover and X5 use slightly diferent pinouts although the same conector. I have downloaded teh pinout for the x5 but haven't found it for the RR so am hoping the colours are for the same components... that's as far as I have gotten.

- D