However, the admin at the school didn't find his costume amusing and said he wouldn't be able to participate in the special day.
Liam's mom, Nicola Scholes, a primary school teacher, explained the whole odd situation:
"We thought it was funny. We were walking home from school and he had the idea of going as Christian Grey. At first we laughed it off but the we discussed it with a few friends and saw the funny side and decided it was quite a good costume idea. He went in a suit and shoes and with an eye mask and cable ties. The cable ties were tiny and not enough to do anything with them. We didn't think there would be a problem.
I got a phone call home from the school saying the outfit was inappropriate and that he had been excluded from taking part or being in any of the photographs.
Me and the teacher agreed to disagree and it's not being taken any further but I was disappointed for Liam that he'd been stopped from taking part and that he's had a dressing down.
One of the teachers went dressed as Dexter and I don't see why sex is seen as more offensive than murder.
If it was a primary school I could understand but it's a secondary school and the book and the film have been everywhere - it's one of the most famous books in recent years and it's not like the pupils will be unaware of it."
That's a totally fair point! Why IS sex more offensive than murder?!
The school has refused to comment on the situation.