There has been a recent move away from one off external courses, which is generally positive. However, for some schools this has been equated with stopping any external input into schools.
Recent research points out that external facilitation is a common factor in successful outcomes, working sometimes in tandem with internal specialists. This ensures that practice within schools is challenged, up to date and has specific expertise.
It is important to choose external expertise carefully, to engage with research and to build relationships with rigorous external organisations, such as HEIs.