Been catching up on this over the past couple of weeks. Binge watched Series 3 last night (yes I was up until 2.30 am). OMG, talk about edge of seat TV. Stomach still churning a bit so will leave it a couple of days before I embark on Series 4.
I have just finished watching series 5, stayed up until after 2am, but went to bed happy, I noticed a few things the second time around that I did not take in the first time around, so glad that I watched it again.