Oh dear, I have recorded these last 4 episodes, but not had time to watch them yet due to work. Was planning a poirot fest on Sunday (with a short break for the Grand Prix), but am worried now as it seems, from the comments here, it was not as good as I hoped.
Will persevere and fingers crossed I don't delete half way through.
As you say penguinpaperback David was the poirot for me, and I agree about Joan Hickson too.
Both of them have captured the essence of the characters in the books, and are just as I had pictured them in my mind when reading them many years ago.