History isn't exactly clear, but it appears a Star Trek: TNG episode was never seen in England, for a very particular reason: it featured a single line of dialogue that tried to predict a future that seemed highly unlikely at the time. It's a story I've never heard before, but it's the kind of thing that would probably have driven Trek creator Gene Roddenberry crazy.

The 'Banned' Star Trek Episode That Never Aired In The U.K.