One thing that's been odd about this whole issue is the lack of leaks to friendly press from the civil service, to defend their position.
There have been lots of leaks and "sources said x" about many other areas of disagreement. But on this topic, it's always been parents, teachers / governors who've been given their marching orders for not complying with the ideology, or MPs commenting.
Have I missed it, or has there never been a "sources at DfE defended the policy / the length of time" etc type of story? I've not seen one, and usually you can see things playing out in that way over other issues. But not this.