I'm one of the few who was lucky enough to have a black primary head.
It did make a difference to my schooling.
I also know teachers who are now retired who didn't want to be heads but were in other senior positions. They had to move schools to get to those positions. If they went for permanent jobs in certain areas even though the schools couldn't retain teachers they wouldn't get them as they weren't white. The schools were also poorly performing. A few months back I heard on the radio a teacher talking about her experience on one of those areas. She ended up resigning as she challenged the racist attitudes of the staff to the black pupils, was labelled a trouble maker for doing so and also faced racism herself.