Thanks for getting back to me. I'll have to check it out when my next lot of student fees come through in January. Was it easy to fit? I'm don't have the radio code for my car and wondered if I will need to get that too.
I don't usually have much luck with fitting things to my car, so I got the guy in the shop to do it for me. Looking at the instructions though it looks very straightforward. The box just needs hooking up to the back of the stereo and then you can run the wire from that to wherever you want. There is a compartment where the CD changer should go in my glovebox that it runs in to. This will probably depend on your car.
I think you will only need the radio code if you have to completely disconnect the radio and I don't think that is required. Didn't need it when I got mine done.