I think a bit of cherchez la femme is in order here. After all, in order to sue for unfair dismissal it is first necessary to have been dismissed - not something that an employer undertakes lightly in this day and age.

It's been asserted by this book's author that all teachers "revise" pupils' coursework. Blame league tables, coursework assessment instead of exams, and the fact that apparently you need an A-level even to get into Army school these days (though history of art will do). I think Harry is not so much a cheat, as the victim of a blackmailing bitch who's in cahoots with Max Clifford.