I feel like you're all missing a key part of that headline, which I grant you is doing a lot of work in a few short words.
In what way is she "the UK's strictest headmistress"? Who makes this determination? Is there some kind of scoring system in order to ensure that this particular accolade is awarded correctly? And perhaps most importantly, why does being the UK's strictest headmistress grant her any kind of authority over the relative tastiness of cheese, and why does her judgement on the matter merit a story in one of the UK's most widely read newspapers?