Mr. Denning Drives North (1951)

...that I remember 27 years after I last saw it anywhere. John Mills plays Mr. Denning the father of a young woman who is seriously dating a mysterious character. Mills investigates his background and doesn't like what he finds, he has an argument with the young man and the fellow falls, hits his head, and dies. Thus Mr. Denning "drives north" into the rural English countryside to dump the body and make the death look like the result of an automobile accident.

Alas for Mr. Denning, nobody seems to notice this guy's absence, not even his daughter, who tells her Dad - shortly after he has accidentally killed the bad boy boyfriend - that he was right all along about her former boyfriend and that she has fallen for an American attorney. Thus, Mr. Denning's interference, fight with the young man, and cover up of his death were all unnecessary in the first place. Past that point I don't remember too many details except that there were several unexpected twists and turns in the plot and that the end could have not happened in an American film in the 1950's due to the production code.

What a shame that we have reality TV as far as the eye can see - and even on DVD - and yet this fine old British noir seems to have disappeared off of the face of the earth.