What a terrifying post Elijj.
I remember my headmistress (old-fashioned term but seems right for her) telling us how important the integrity of exams was. That she wouldn't hesitate to pursue any example of cheating she identified, not just to punish us as individuals but because the name and quality of the exams we were taking were important to the functioning of the country. I can't imagine her getting involved in something like this.
My ds's state school statistics barely shifted.
I'm really distressed to hear that you'd give 'leeway' to a school you think is a big name. A school that cheats and undermines national qualifications is not a good school.