The withdrawal of the film discussed is what is specifically the "British withdrawal."
It is also interesting to see where it was banned in the USA. As Wikipedia notes,
In 1976 A Clockwork Orange was removed from an Aurora, Colorado high school due to "objectionable language". A year later in 1977 it was removed from high school classrooms in Westport, Massachusettsfor similar concerns with "objectionable" language. In 1982, it was removed from two Anniston, Alabama libraries, later to be reinstated on a restricted basis. Also, in 1973 a bookseller was arrested for selling the novel. Charges were later dropped. Ironically, each of these instances came after the release of Stanley Kubrick's popular 1972 film adaptation of A Clockwork Orange, itself the subject of much controversy.
That's right: Aurora, Colorado!
See The Copycat Effect, pages 221 and 224, for more on A Clockwork Orange and how Oliver Stone felt about Kubrick's withdrawal of the film.