LONDON—A British boy got in trouble at school when he arrived for World Book Day celebrations dressed as the lead character from racy novel “50 Shades of Grey,” complete with bondage equipment.

While other youngsters marked the event by dressing up as Harry Potter, Willy Wonka or Paddington Bear, the 11-year from Manchester, northwest England, was slicking back his hair and dusting down a sharp suit as worn by the fictional billionaire Christian Grey.

But his efforts left teachers at Sale High School unimpressed. They banned him from group photographs and told him to alter his outfit, the school said.

His mother, Nicola Scholes, a primary school teacher, posted photographs on her Twitter page on Friday, 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?”

Fun got out of hand

The schoolboy claimed that the stunt was “a bit of fun” that had gotten out of hand.

“I thought personally I didn’t want to go as a cartoon character, so I chose Christian Grey just to have a bit of fun,” he told the local Manchester Evening News. “A lot of fuss has been made over nothing.”

Did not read book

The mother said that her son had not read the book or seen the recently released film, but admitted he was “aware that the book contains things of a sexual nature.”

“His argument was it’s the most talked about book character in the last couple of years,” she told BBC Radio 4’s Today program. “Apparently it went down really well with the vast majority of the students, they all took it for the tongue-in-cheek joke that it was meant to be. They (teachers) wanted him to be James Bond who ironically is a very promiscuous character who kills people so I don’t know which is worse of the two.”

She pointed out that a teacher had come as US fictional serial killer Dexter.

Reflects standards, behavior

The school head teacher, Lynn Nicholls, said her decision “reflected the school’s high standards in terms of student behavior, welfare and safeguarding,” and denied he had been banned from all the celebrations.

“His costume was modified and he was then able to fully participate and enjoy the day with his peers,” she said.