In English education, we are living in extraordinary times. A striking example is the huge growth of academy schools, particularly in the secondary sector, a growth that has happened without key questions about effectiveness, sustainability or value for money being addressed. It is a vast structural experiment, in scale going far beyond what has been tried in any comparable country. However, Unleashing Greatness, a new 130-page report by the high-powered Academies Commission has investigated the issues in some depth. Its report makes extremely uncomfortable reading.