Reasons for my own classification

The reason the '15' rating was chosen for the trailer was that it reached out to the widest audience possible, without cutting back on the shocking nature of some of the 'tricks' involved. Due to the involvement of a gun and the element of kidnap and restraint, which go against the rules of not glamourising weapons, and the involvement of mature themes which could be imitated or cause fear amongst a young audience.

However the violence levels within the trailer are not excessive and wouldn't warrant an '18' certificate, which is used for films which contain strong bloody violence. However not all of the violence will be seen within the trailer and therefore the rating on the posters will ned to apply to the film as a whole.