It would also be helpful to discuss what is good in the model presented in Bohunt experiment.
For those results to occure, a greater number of students did significantly better with the Chinese method. The Bohunt Maths teacher is very content with himself, but his students achieved an unimpressive 55%, that is an overall D, right?
The UK maths teaching has a methodological weakness that cannot be compensated by excellent teaching, because their is never going to be enough excellent teachers.
The modernised "progressive" teaching style disadvantages perfectly bright intuitive learners and doesn't improve results for low achievers. It just puts gloss over their falling progressively behind.
I am certain the organisation of teachers’ time could improve and this is a very constructive conversation to have.
Personally I don't think such huge difference is results (68% vs 55%), achieved in such a short time, with such headwind and disruption in the first 2 weeks, could be explained away by longer hours. It is statistically impossible to achieve without greater number of students doing much better with the Chinese method. It is just a method that works best, that is why it was used for centuries and is “traditional”. Because it works.
It is not uniquely Chinese, it evolved based on intuitive insight into being effective – it helps to concentrate, to stay productive, to be motivated and ambitious. It is also a method that suits better a larger number of learning styles.