Classification
The British Board of Film Classification or (BBFC) was founded by the British Film Industry in 1912 and is responsible for the classification and censorship of films exhibited at cinemas and video works released on physical media within the United Kingdom.
A 'U' should be suitable for audiences of four years and over, although it is impossible to predict what might upset any particular child. U films should be set up with a positive framework and should offer reassuring counterbalances to any violence, threat or horror. Drugs, discrimination, bad language, sexual nudity, sexual content and high levels of violence are very unlikely to be seen.
A 'PG' or Parental Guidance film is for general viewing however some scenes maybe unsuitable for young child. 'PG' films should not unsettle children aged 8 or above. A child of any age may come to watch unaccompanied, although parents are encouraged to consider whether the film may upset younger or more sensitive children. Much like a 'U' film you are unlikely to see positive references to drugs, discrimination, bad language, sexual content or high levels of violence.
Universal
Parental Guidance
12/12A
15
18
Films rated 12 or 12A contain material that may not be suitable for children under the age of 12. No child under the age of 12 may view a 12A film unless accompanied by an adult. Adults planning to take a child under the age of 12 should consider whether the film in question is suitable for that certain child. Unlike 'PG' and 'U' films
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No one under the age of 15 can see, rent or buy a 15 rated video work. The work as a whole cannot endorse discriminatory language or behaviour, although there may be references to racist, homophobic or others discriminatory themes within. Drugs may be shown however the work as a whole cannot promote drug misuse. There may be strong language, threat and violence with no restraints on nudity in a non sexual or educational way.
No one younger than the age of 18 can see, rent or buy an 18 rated video work. Adults should be free to chose their own entertainment, there are very little restrictions due to this.