The British Board of Film Classification (BBFC) has given Harry Potter and the Goblet of Fire a 12A rating in the UK. The rating means that children under 12 can go and see it but only if they are with a parent or guardian. According to the BBFC the rating was given because the movie is "scarier and darker" than the others.
In an interview with CBBC Newsround, Helen Pang of the BBFC discusses the process in deciding the ratings and the reason why GoF received the rating it did:
The latest Harry Potter film is much darker and scarier than the previous three, which were all classified PG (Parental Guidance, suitable for people aged around 8 or older).
So Examiners decided that the 12A was the most suitable category, as younger or more sensitive viewers could be frightened by some of the more intense scenes (which I can't reveal as you'd get upset with me!).
The ending was a shock too, although maybe if you have read the books, you'll be expecting it anyway.
At 12A, we allow moderate level violence, but without focus on injuries or blood. We also allow scenes of threat and horror, but only if there is little 'gore'.
The UK rating seems similar to the one in the U.S., which was released back in August.