I've run my own lorry based buisness for a number of years and moved into Driver Training in 1985 when two people who worked for me needed a C+E licence (HGV class 1) and just could not find a training provider who offered the right training at a realistic price. I trained up both of them successfully and the rest as they say is history. In 1985 I attended the RTITB (The only recognised body to Road Transport) and also did the re registration courses as and when they were due. Since then the DSA have started their voluntary registration which I joined when launched. In January 2008 I re-sat & again passed the LGV Instructors course for the third time running including the new Theory Test and the Hazard Perception. So I know from personal experience what you will be expected to do.