Fitted a cheepy Chinese brand head unit. This model is a direct plug and play, didn't even have to set the steering wheel controls or change the Jeep logo at the start.
It's Bluetooth, GPS, DVD, USB, SD card and reverse camera capable. I'm also going to buy a separate unit to make it DAB+ (if only we could receive digital radio in Newcastle).
The only issue I'm having is for some reason there is no sound using the GPS, and I had to buy an aerial adapter as it uses the old style plug.