Even though in UK it is rated "U"...

... which is basically a "G" rating in America, which means it is universal and suitable for all audiences including kids of all ages, it has more violence (in the form of beatings, killings and beheadings, albeit not too explicitly) and some adult themes in it than most films with a "12" or even a "15" certificate, even though of course it is nowhere near as violent and disturbing as, say, Pasolini's own "Salo" film from 1975.

But it is still rated "U" here, I think it should be a "12" at least.