Commenting on the passing of motion 22 at Annual Conference in Harrogate, Daniel Kebede, general secretary of the National Education Union, said:
"Even on its own terms the great academies experiment has been a failure. The original aims of the programme included boosting autonomy and driving efficiency, but the opposite has resulted. Academies within MATs are now under more stifling control than ever, and an expensive academy bureaucracy has developed, with bosses at the top receiving eye-watering sums.
"This is a wildly inefficient system, and one that promotes empire building and competition between schools, rather than collaboration. At the same time, the safety net has been cut away, making it even harder to meet the needs of all pupils, particularly those with SEND. The result is a less equal and less inclusive education system.
"The government has a historic opportunity to restore principles of fairness, inclusion and cooperation to our schools. This must involve ending the one-way street of academisation so that schools can return to the local authority. Forced academisation has been a failure, driving stress and fear, alienating communities and disrupting genuine efforts to improve.
"The excesses of the academy sector are one area where efficiencies could be found, but the government must at the same time invest in our schools and rebuild genuine local oversight and support."