A 'U' certificate film is suitable for all audiences, it may contain mild horror, or violence but this will be strongly disaproved of.
A 'PG' which stands for parental guidance; is suitable for most children at the age of 8 or over. The parent is encouraged to consider whether it is suitable for their child especially if they are more sensative for example. Most genres are acceptable but only mild, for example only natural nudity and no sexual content.
A '12/12A' is reccomended as not suitable for children under 12 years old, however if accompanied by a parent or guardian the child may watch the film, the responsibility of effects on the child lies with the parent or guardian. In 12/12A's most genres are acceptible but must not be glamourised.
Nobody under the age of 15 may view a 15 rated film and are not aloud to buy or rent a 15 film. All Genres are acceptable but easily accesed weapons are not to be glamourised and easily accesed solvents and aerosols are unlikely to be acceptable.
Nobody under the age of 18 may view a 18 rated film and are not aloud to buy or rent a 18 film. In the 1998 human rights act it is stated that Adults may choose their own entertainment, however exeptions are made when the film contains material gathered illegaly and if the material is believed to harm the individuals pyschological characteristics or if sexual violence is involved.
'R18' films are only to be shown in specially liscensed establishments and cannot be purchased on the internet or by phone etc. These usually contain strong sexual content including fetish. These films may encourage an interest in sexually abusive activity.