There are guidelines around heading at junior level: https://www.bbc.co.uk/news/uk-scotland-51614088 https://www.bbc.co.uk/news/uk-scotland-51614088 But it's

There are guidelines around heading at junior level: https://www.bbc.co.uk/news/uk-scotland-51614088 https://www.bbc.co.uk/news/uk-scotland-51614088 But it's one thing to not practise it, and another to actually ban it. I can see the latter in <5 years at all levels if the current research is followed up correctly.