According to Total Film, the BBFC has rejected The Human Centipede II (Full Sequence) from being released on the grounds that it is “sexually violent, and potentially obscene”. It is extremely rare for a film to be completely banned by the BBFC in this day and age. It was a much more common occurrence back in the 1980’s with all of the “Video Nasties” such as The Evil Dead and Cannibal Holocaust, however with the increase in violence and gore featured in mainstream cinema, the BBFC has taken a more relaxed approach to it’s ratings system in recent years.
The BBFC explains it’s reasoning behind the ban below.
The Human Centipede II (Full Sequence) is a sequel to the film The Human Centipede (First Sequence), which was classified ‘18’ uncut for cinema and DVD release by the BBFC in 2010. The first film dealt with a mad doctor who sews together three kidnapped people in order to produce the ‘human centipede’of the title. Although the concept of the film was undoubtedly tasteless and disgusting it was a relatively traditional and conventional horror film and the Board concluded that it was not in breach of our Guidelines at ‘18’. This new work, The Human Centipede II (Full Sequence), tells the story of a man who becomes sexually obsessed with a DVD recording of the first film and who imagines putting the ‘centipede’ idea into practice. Unlike the first film, the sequel presents graphic images of sexual violence, forced defecation, and mutilation, and the viewer is invited to witness events from the perspective of the protagonist. Whereas in the first film the ‘centipede’ idea is presented as a revolting medical experiment, with the focus on whether the victims will be able to escape, this sequel presents the ‘centipede’ idea as the object of the protagonist’s depraved sexual fantasy.
You can read the full report on the film here however, be aware that it contains huge spoilers.