The document summarizes how the British Board of Film Classification (BBFC) assigns age ratings to films in the UK. The BBFC watches films in their entirety and uses classification guidelines to determine if a film should receive a U, PG, 12, 15, or 18 rating. The guidelines examine factors like discrimination, drugs, horror, language, nudity, sex, violence, and imitable behaviors that may be unsuitable for certain age groups. Stricter ratings may be given to DVD releases since they allow for unsupervised home viewing by younger audiences. Each age rating is described in terms of what types of content are considered acceptable or unacceptable.