Again from the parents' bbfc site:
"Will there be uses of strong language in a ?12A? work?
The BBFC's Guidelines state that there may be strong language (eg 'f*') at ?12A?, but it must be infrequent. The context of the strong language is important and aggressive uses of strong language may result in a film or DVD being placed at the ?15? category. There is some allowance for puns on strong language at this category."
And from the search facility that allows you to check the content of a specific film:
"Extended Consumer Advice
'Jumper' is a fantasy action film about a young man with the power of teleportation. The film contains one use of strong language and moderate violence.
There is one use of strong language (f**k'), alongside uses of milder expressions such as 'piss', 'shit' and 'damn'.
The film includes several scenes of fantasy violence, as well as one undetailed stabbing by the arch villain in the film. There is no sight of blood or injury in any of these scenes, something that creates a fantasy, action tone rather than anything brutal or visceral.
The film also contains one mildly sensual love scene without anything sexual on screen.
No-one younger than 12 may see a '12A' film in a cinema unless accompanied by an adult. No-one younger than 12 may rent or buy a '12' rated video or DVD. Responsibility for allowing under-12s to view lies with the accompanying or supervising adult."
The information is there if you want to check the content of a film before you let children see it.