The British Blu-ray released by Arrow in the Years of Lead box set is censored to remove scenes of lab mice fighting with each other, as required by the BBFC under the auspices of the Cinematograph Films (Animals) Act of 1937. The offending footage is replaced by a black screen which plays over the soundtrack. The Blu-rays will, however, play the uncensored version if the player is set to a region other than B.