That's very totalitarian shit of him.
Schools should be free to decide how they manage covid risk, including by use of masks. Obviously when there's a formal mask mandate in place they must follow it. But when there isn't they should be able to choose either way.
This is a reaction to The Telegraph having a front page article on schools which are deciding to keep masks (cases still high, as the London ripple is still moving outwards, don't want to disrupt GCSEs or have mocks on chaos etc)
But the mendacious government is desperate to have full control, even when it's utterly wrong. Next question is why - the public do not like being bullied, so it's quite a high risk approach to tell people that actually they mustn't make up their mind about local risk and must instead engage with central government (slower, and not likely to understand local factors without timewasting briefing)
If undermining HTs is an acceptable price for a sop to the U4T fringe in the parliamentary party, then it is clear to me that this is yet another example that government lacks integrity