His mother, Nicola Scholes, a primary school teacher, posted photographs on her Twitter page, showing her son posing in his outfit while brandishing cable ties and a blindfold, props used by Grey in the novel's more risque passages.
Underneath she wrote "Offensive costume. Excluded from photos, told to change yet teacher dressed as a serial killer and others with guns?"
08:02 California cops say 'disgruntled' student's school shooting plot thwarted25
18:00 Florida student: They told us: 'Hands up. Drop anything in your hands.'58
21:02 Seventh-grade student who shot himself in school bathroom dies from his injuries21
18:41 We wouldn't be America without student activists12