Did not do either of the courses but did work through the company I worked for for 8 months before I got to despatch. They like people who understand the problems in other areas to beable to cope when there are major problems on line.
Too 2 weeks to train up once in despatch and load control and then it was hands on and learn all the extras as you worked. Highly recommend it as a career. Unfornately my circumstances changed or I would be back like a shot.
Hope this helps
TnT