I had almost written off my Mercedes radio/cd/GPS system and infotainment screen, it having failed completely, but Neil insisted that there was a 95% chance that he could mend it. Mercedes wanted a huge amount of money to replace the unit, so I had nothing to lose. True to his word, just two hours in the workshop saw me driving away with a fully functioning unit once more.
Many thanks to Neil and Baz for their expertise and professional service.