Out of curiosity, I wonder if there will ever be a reference to the Doctor’s first companion, Ian Chesterton, currently Chairman of the Governors, and whether his review of the peculiar actions of the “Caretaker” in his school would ring a bell when he reviews the employee list?
In addition, the Headmaster isn’t Wendy Coburn anymore, but a male.
Another interesting point: The aliens in a school setting is very similar to that of Deffry Vale School in the episode that signified the return of Sarah Jane Smith and K-9, the second season episode “School Reunion.”