OH my god! 
I really forgot to put it into my list. Unbelievable: I recommended this masterpiece to you all the time, over and over again, just to forget it by myself. Added.
Your suggestion about Cocteau matches the athmosphere, the form and even the narration of the film precisely - but I liked the Clayton more due to its - well, I know it sounds strange - gentleness, though (the harder;-) "La belle et la bete" is a great film (which I already saw on the big screen, I hope this also happens with the stunningly photographed "The Innocents" one day).

You forgot your rating, btw. I still can't believe it: 77/100 What is going to happen next? 

EDIT: Just added John Boorman's classic "Point Blank" to my list which I just finished. What a great experience - Once again I'm thrilled about my positively disappointed expectations. As I already knew "Deliverance", I should've known better.