This document outlines the rating classifications for films in the UK - Universal, PG, 12A, 15, and 18. It summarizes the key elements that determine each rating, including what language, sexual content, violence, and other mature themes are permitted at each level. For example, a Universal film can contain mild language but no overt sexual behaviors, while a 15 film allows strong language and moderately long sex scenes without strong details. An 18 film has no limits on any content but should not promote dangerous or criminal behavior.