It doesn't allow for the differences in ability that can occur in a year group. It takes so long to explain it, which has to be done over and again.
Many ofsted inspectors are head teachers who take time off from their own schools, or change jobs to become full-time inspectors. Increasingly many head teachers are younger and have not had as much experience of being straightforward teachers, as few of them now have any time left to teach because they have so much paperwork. So there is not as much sympathy for the teachers from either side. Also the inspectors seem to be far harsher on the schools they inspect than they were on their own teachers, according to a BBC report a couple of years ago which stated that many ofsted inspectors had once been heads of failing schools.
Glad you liked the chocolate cake idea, steal away!
I am thinking I may use it again at this school. Every time they get a new head, they get another inspection. Even if they have had an excellent report only the year before. It's not as thorough, it's still unsettling though.