That's interesting culturally.
Over there, the BBFC is picky about violence.
Here, the MPAA or FCC are very picky about nudity, sexuality, and language.
Notice how "The Walking Dead" can be gory as can be, but God forbid they say "the F word" or show breasts.
It's also interesting that to avoid an 18 rating the violence had to be cut down somewhat, but the show airs on television in the United States with a TV-14 rating without any violence edits. Again, the rules for AMC to receive the TV-14 rating is that "The Walking Dead" cannot show nudity or say "the F word" or "the C word" (either of them), and also they are not allowed the say "shit" more than three times, nor can the say "goddamn" or "Jesus Christ" (they can say "Jesus" or "Christ", but not together).
Even the first three episodes of "Breaking Bad" aired on AMC, but with TV-MA ratings because of the language (which was muted out) and nudity (which was blurred out). But the first three episodes of "Breaking Bad" were made with the impression that it was airing on HBO, a channel that you must pay for to watch in the United States due to their having absolutely zero censorship whatsoever.