The installation is complete now. We failed in one are which was connecting the steering wheel controls. This is because I ordered the wrong lead twice and lost the will to live on that one. Also there is not much room behind the stereo for the extra box it uses, so we called it a day on that one. In truth the fascia is much more user friendly on this one. 18 DAB presets in in a bank of 6 push button presets and a quick switch to change between banks 1,2 and three are easy to do even in a bouncing GP.
Phone auto answers and calls are easy to do using the Siri connected voice recognition. Bluetooth music is a doddle, as is cd and usb music. The sound is as good as in the Opel GT, or better than the Mini Harmon Kardon of the JCW coupe. Put simply we are delighted with the upgrade.