British fears from, The Clockwork Orange

This movie is cut from the same cloth as THE CITADEL, and the idea is that the best horror movie is where the monster is a human or humans, not some funky werewolf, vampire, or zombie.
For Americans the human monster is the crazed seriel killer.
For Brits it looks like the human monster comes from directly in their midst, when humans go feral.
This is not new. Watch the classic, 1970's THE CLOCKWORK ORANGE. The British seem to live in fear of the worst, the breakdown of their society into a situation where society still exists but everyone is subject to random violence.
For Americans the fear is exaggerated. Breakdown of society comes after a nuclear war, a worldwide plague which either kills off everyone or zombifies people. It's silly. But the British version of apocalypse is much more mundane, realistic, and just as terrifying. You can still go to bed, wake up and go to school or work or try to follow your normal life but you can't count on doing these things safely anymore because you can be randomly jacked by several extremely violent hoods.
In these kinds of movies, Americans rely on the single, violent sociopath a la Hannibal Lecter.
The British movie versions rely on groups of attackers, which I think might be more realistic. Thugs prefer to attack in groups like wolfpacks.
The hooded jacket is a nice horror touch, concealing the face and helping to dehumanize the attacker. But then again, such people prefer to hide their identities.