Just to update - @pab567 supplied me with an upgraded Bolero unit and I could not be happier. It was an easy swap, just needed a torx screwdriver, some radio keys (which were kindly supplied) and a bit of jiggery pokery. Setup was simple and self-explanatory. I initially had some Android Auto connection issues but that was traced to a cheap USB cable. After purchasing a very short 10cm decent cable (a whole £6), my phone now sits securely in the cubby under the media port and the whole system works flawlessly. It does everything I need and is a brilliant upgrade. Thank you @pab567