Life on Mars
It's rare that you get anything that's original but here's a great example. In times where we are subjected to rebooted series that were popular when most of the advertisers important demographic weren't even born here we have a series that you'll have never seen anything like it before. I know people who read this will never experienced that but with this in mind here's a classic. Being original isn't, of course, going to make it a success so the scripts are top class and the characters allow the superb actors to create something very special.