By the time I went back as an instructor (1989) There was a lot of streaming. After basic Dominies they were streamed ME or FJ. FJ students did Low level Dominies then basic JP. Then further Streamed LL or Air Defence for a dedicated advanced JP course.
That's interesting. When I was there on the JP 1983-7. The course ran common Dominie and JP phase then streamed for further Dominie and JP for the fast jet stream and only Dominie for GP 2.