This is the best book I've read - by a mile - for absolutely ages, maybe years.
It helps if you've actually heard the regional accents that inform the phonetic style of the writing before (there's a Liverpudlian, a girl from Yorkshire, an Essex boy and a few Welsh characters, so I imagine, say, an American reader would find it really hard going) - but if you have, you'll crack through the different snapshot-stories as if it were your own inner monologue you were listening to. The characters really do LEAP off the page at you, too - what makes the book so powerful is that you can begin to accept their motivations just the way they explain them to themselves, until you glimpse the same events from another point of view.
It's not all grit and grime, either, and even the worst folk in the story sometimes have a warmth to them. Disco-ball flicking from one scene to the next weaves each character's story tightly to the others.
I can't recommend it enough.