Mr Charles was the driving instructor who gave Tyrone Dobbs his first legal lessons. The former tearaway had spent several years stealing cars and joyriding and didn’t have the common sense to hide his ill-gotten knowledge from his new teacher. Confident behind the wheel, Tyrone went over the speed limit on his lesson and was sarcastically asked by Mr Charles if he knew what the legal limit was, prompting the rejoinder, “God, you're supposed to be a driving instructor - don't you know?!”