The document discusses film certification ratings used by the British Board of Film Classification (BBFC). It provides details on the content restrictions and guidelines for movies rated U, PG, 12A, 15, and 18. For each rating, it lists what types of content are permitted as well as restricted, such as violence, language, nudity, sex and themes. Examples of movies that received each rating are also provided. The concluding paragraphs discuss how a hypothetical horror film planned by the author would qualify for a 15 rating rather than 18 due to its portrayal of violence, language, and other content.