I think that LD system is great. There are visual aids so that when you are in the car you can see what the instructor is on about. Also when you have done the lesson there is a book that you go away and learn the next section for your next lesson. This means that when you get in the car you know what you are going to do and you haven't got to spend too much time talking about what the lesson is going to be. As for Mark, he is a great driving instructor with real patience and he is also very good at explaining what could be done to make your driving better and also how you can be safer as to enhance your driving further.