This document summarizes the different film rating classifications in the British board. It explains that a U rating means the film is suitable for audiences aged 4 and over and can contain very mild language and violence. A PG rating indicates a film is aimed at children aged 8 and older and may explore challenging issues. A 12A means children under 12 must be accompanied by an adult, while a 15 rating prohibits those under 15 from viewing strong violence, language, or sexual content. An 18 rating classifies a film as only for adults and may contain very strong themes. The R18 category is legally restricted to explicit adult content.