I've just watched it on iPlayer. It took a long time to get started, and there are a few too many moody close-ups (although I don't mind moody close-ups of Aidan Turner), once it got going it was pretty good though.
I had thought that the doctor was Damien Lewis, I wondered why he sounded so different when his usual accent and tone would have worked just as well. 
I can't remember how everyone dies or in what order, I think I read the book as a teenager which is so long ago that the book wasn't even called 'And then there were None' it was called 'Ten Little Indians'. It's just as well as forgetting has added to the suspense for me. I hope Aidan is one of the last to die .