The document discusses age classification ratings for films in the UK, including U, PG, 12A/12, 15, and 18. It provides guidelines on the types of content allowed under each rating, such as violence, language, sex, nudity, and more. Based on the information provided, psychological thriller films most commonly receive a 12+ age rating (55%). However, the document concludes that in order to have a larger potential audience and revenue, despite the target demographic being 18-45 year olds, the filmmaker's psychological thriller will pursue a 15 classification, which is generally what the genre receives and will allow more people to view it.