London: Thousands of British students mark World Book Day by going to school in costume as their favourite fictional characters. But one 11-year-old found himself in a bind when he dressed as Christian Grey, the S & M-loving billionaire hero of erotic thriller 50 Shades of Grey.

Teachers at Sale High School in northwestern England sent Liam Scholes home on Thursday after deeming his suit, accessorised with cable ties and an eye mask, unacceptable.

The school said on Friday that the decision “reflects the school’s high standards in terms of student behaviour, welfare and safeguarding.” It said Scholes returned once he had “modified” his costume.

Scholes’s mother, Nicola Scholes, defended the costume, saying children knew who Grey was from media coverage. She said he “walked into school yesterday and every child knew who he was.”