User blog comment:Fimber/The Grinch?/@comment-4190137-20121215003419

You know, recently I came up with a conspiracy theory about this. You know how there were rumours spreading around after Series 3 that the producers were facing financial issues?

What I think, is that after Series 3, BBC and Shine told Capps and Murphy to make the show as dark as they can possibly make it. And take it in a whole new direction (little that they knew it would abandon a lot of the events in Series 1-3). If they didn't the BBC would cut the show.

It's just a theory, but there is a lot of evidence to support it... as I just said.