A word of advice to pupils of any age at St. Augustine's who may be reading this blog.
Several people have commented with words to the effect that the Headmistress is a bully, and they are concerned that if they identify themselves then Mrs Gumley Mason will take it out on their children at the school.
I have no way of knowing whether that is a reasonable fear or not. I don't know Mrs Gumley Mason and have never met her. But you do know her. If this is a genuine and reasonable fear, then I recommend that you don't comment here unless your parents have checked the comment over first. Better still, whatever you were thinking of saying here, tell your parents instead and suggest that they write the comment. They are likely to be much more careful to word it so that identifying information isn't included by accident.