Sony's official Gangs of London website doesn't have too much on it right now. It only has two things: an absolutely amazing trailer and a completely free UMD demo disc. All you need to do in order to grab a demo of this incredible looking Sony's official Gangs of London website doesn't have too much on it right now. It only has two things: an absolutely amazing trailer and a completely free UMD demo disc. All you need to do in order to grab a demo of this incredible looking 