I am trying to establish the training schedule for ground crew (probably aircraft maintenance) around 1939 / 1940.

I know that there was an 18 week course, (5 wing Halton), followed by a 6 month course, (1 wing Hednesford) but I am not sure what followed after that.

Does anyone have a training schedule and/or service record that would identify "what happened next" and what qualifications would be obtained along the way?

Any help would be much appreciated