Certificate Ratings:

In Britain today there is an age rating system that rates the viewing age group based on the films, games and even books. The BBFC (British Board of Film Classification) determines the age groups suitable for viewing films. They rate films mostly by these:

U- Universal, suitable for all age groups. For example; All Disney films

PG- Parental guidance is needed for younger viewers; Rango

12/ 12A- Suitable for people aged and over 12. Contain mature films, drug use and swearing mostly. For example; Scary Movie, Spiderman.

15- Suitable for people aged and over 15. Contains strong violence, mature films, limited swearing, drug use and not many sexual clips. Film example; The Dark Knight, 

18/ R18- Suitable for people aged and over 18. Contains strong violence, mature films, strong swearing, drug use, explicit sexual activity and references, strong gore etc. For Example; Kill Bill, The Descent.