WAS SOMETHING CUT FROM THE CLIMACTIC SCENE?
I recently saw this movie on TCM, and the scene in question shows the Rolls Royce entering the tunnel (a creepy scene, considering the later death of Princess Diana), and immediately after, there's a placard reading "Esther Costello Tragedy".
There was no scene depicting Margaret shooting Carlo or of the car crashing.
I'm inclined to think that the scene was the victim of sloppy editing.
On the plus side, at least the rape scene was handled tastefully, with the camera focused on the open French doors and the rain pouring into the room.
If this movie was made today, that scene would be VERY graphic!