Nor did I say that the practice of setting is "damaging". In fact, I said that there may be pragmatic reasons for setting pupils for maths in Years 5 and 6 because planning can be easier if the attainment range in class is not too wide.
My views on setting are expressed in the Framework for teaching mathematics which was sent to schools in March.
Director, National Centre for Literacy and Numeracy
59-65 London Street, Reading