There are rumours going around that ITV have pulled the plug on Poirot adaptations. I have to say that the last few they have produced, with the exception of The Clocks (one of my all time favourites) and Halloween Party that I am not surprised - they have been absolutely dreadful. The words "based on" are truley apt. In my view Murder on the Orient Express, Appointment with Death and Murder in Mesopotamia - to name a few of the recent releases are appalling and do not bear much resemblance to Agatha's stories.
It is beyond me why on earth they have to change them in the first place, characters missed out, completely new characters introduced, sex of characters changed and completely new sub plots inserted.