This show has a lot of promise ... good casting and a different threaded theme to continue with more episodes. There is a good amount of creativity and variables to make each story interesting.
The one, thing, though, that I don't like about the show is I cannot understand OVER half of what the actors are saying. Either the suspense-to-impact music drowns out an important sentence/statement or the accent fluidity is so thick and/or slurred/blurred I end up rewinding five or six times to attempt to understand what is being said (and most times have given up). If this speech were worked about more, there would be more of a viewing audience. I'll try and watch a few more episodes to perhaps get more familiar with their speech patterns, but after four episodes of viewing I'm ready to give up and wait until it comes out on DVD so I can turn on English subtitles ... I think that is what is being spoken, right? I enjoy many British shows, but turn away from them when I cannot understand the speech and fear this will be yet another one I'll have to do a pass.
Other than this, the show has all the right elements and can see that it will have a fast growing audience ... in the UK only perhaps.