As far as we are aware anyone, this means everyone, who drives a 7.5t upwards must do the training, this is one course per year, for five years, then rolling on, ie you have to do a course every year for the rest of your driving life!!
I have done my first course, £ 100 for full day, the company running the course then uploads your driver details to the DVLA, if you don't do the courses then VOSA will know when they stop you, you will then get done, this is after the date it starts, 2014 I think ?
As far as I know it dos'nt matter if you are a scaff or a driver, if you drive a 7.5t truck and above you have to do the courses, every year!
We used Tachodisc, 01925 283328, if you need info give them a call, they are very helpfull