Hi, thanks for your responses.

Ive been down to the main dealer. I have all the necessary wires for the Sat Nav, the screen I have has the cassette at the back - the sat nav box that was originally in it was MK3. Im being told by the dealer that i will have to replace this with a MK3 box as MK4 will not work.

Can someone tell me if this is correct.

Ive seen loads of mk4 on ebay which offer upgrades from mk3 to mk4...

Just want to make sure I dont buy the wrong unit......

thanks