We are based in Dorset. the training courses are voluntary, if you can use the system, which is easy, you wont need to attend one, I never have.
As i said, we found the key is to get the vehicle or company leasing the vehicle to put you up as the vehicle servicing agent and then wait to be asked to apply.
Theres obviously no guarantee of work, but once on the system hopefully with some people recommending you it will build. Its not an overnight thing.
Do wash and vac as asked, because that helps your score with them, and increases the chance of further work, as all customers are surveyed, I know its a pain but it all helps.
Andy