Dredd is a 2012 US/UK/India action movie by Pete Travis.
With Karl Urban, Olivia Thirlby and Lena Headey. See IMDb
The cinema film [in 2D & 3D] was passed 18 uncut for frequent strong bloody violence and gore.
The BBFC explained the rating (with possible spoilers removed):
Dredd is a sci-fi action film based on the popular comic strip. It is set in a post-apocalyptic America in which law and order is maintained by the Judges , who have the power to arrest and try suspects, as well as the right to carry out sentences, including execution. One of them, Judge Dredd, is sent into a tower block to investigate a series of murders.
There is frequent strong violence throughout the film, much of which is bloody and gory in nature, and some of which dwells on the infliction of pain and injury.
The film also contains strong threat and a brief moment of implied sexual violence, in which a man hits a woman. However, the scene is brief and discreet, only implying a violent sexual fantasy inside a criminal’s mind.
There is frequent use of strong language and frequent use of a futuristic and fantastical drug, [slo-mo], which has the ability to prolong pleasure. The drug is used for recreational purposes but also as a form of torture by the villains because of its ability to slow down the perception of time. However, because the drug does not actually exist, there is no endorsement of drug use in the real world.