There is a big difference between how the UK rates movies compared to the rest of the world, here we try to explain how its done.
Broadly speaking, current British classifications are similar to US ones - G equals U, PG equals PG, PG-13 equals 12A (barring a one-year age difference) and NC-17 equals 18
E - Excempt
The E symbol is not a BBFC age rating, but indicates that the distributor believes the content to be exempt from classification. Under the Video Recordings Act 1984 (VRA), a video is exempt if it is designed to inform, educate or instruct, or is about sport, religion or music.
U Universal - Suitable for all
A U film should be suitable for audiences aged four years and over, although it is impossible to predict what might upset any particular child.
U films should be set within a positive framework and should offer reassuring counterbalances to any violence, threat or horror. If a work is particularly suitable for pre-school children, this will be indicated in the Ratings Info.
PG Parental Guidance
General viewing, but some scenes may be unsuitable for young children. A PG film should not unsettle a child aged around eight or older. Unaccompanied children of any age may watch, but parents are advised to consider whether the content may upset younger, or more sensitive, children.
12A/12 – Suitable for 12 years and over
Films classified 12A and video works classified 12 contain material that is not generally suitable for children aged under 12. No one younger than 12 may see a 12A film in a cinema unless accompanied by an adult. Adults planning to take a child under 12 to view a 12A film should consider whether the film is suitable for that child. To help them decide, we recommend that they check the Ratings Info for that film in advance. No one younger than 12 may rent or buy a 12 rated video work.
15 – Suitable only for 15 years and over
No one younger than 15 may see a 15 film in a cinema. No one younger than 15 may rent or buy a 15 rated video work.
18 – Suitable only for adults
No one younger than 18 may see an 18 film in a cinema. No one younger than 18 may rent or buy an 18 rated video work. Adults should be free to choose their own entertainment.
Exceptions are most likely in the following areas:
where the material is in breach of the criminal law, or has been created through the commission of a criminal offence.
where material or treatment appears to us to risk harm to individuals or, through their behaviour, to society. For example, the detailed portrayal of violent or dangerous acts, or of illegal drug use, which may cause harm to public health or morals. This may include portrayals of sadistic violence, rape or other non-consensual sexually violent behaviour which make this violence look appealing; reinforce the suggestion that victims enjoy rape or other non-consensual sexually violent behaviour; or which invite viewer complicity in rape, other non-consensual sexually violent behaviour or other harmful violent activities
where there are more explicit images of sexual activity in the context of a sex work. In the case of video works, which may be more accessible to younger viewers, intervention may be more frequent than for cinema films.