The U symbol stands for Universal. A U film should be suitable for audiences aged four years and over. However, it is impossible to predict what might upset a particular child, especially at this lower end of the category range.
PG, parental guidence means that anyone can can go and see the film no matter of thier age at the cinema,however parents are expected to make the call wether to let their children view the film.
12A means that anyone aged 12 or over can go and see the film unaccompanied. The A stands for 'accompanied' and 'advisory'. Children younger than 12 may see the film if they are accompanied by an adult (eg someone over the age of 18), who must watch the film with them.
No one under the age of 15 is allowed to see a 15 film at the cemima or buy/rent a 15 rated dvd. 15 rated works are not suitable for children under the age of 15
Films rated 18 are for adults. No-one under 18 is allowed to see an 18 film at the cinema or buy/rent an 18 rated DVD. No 18 rated works are suitable for children