I watched "A Separation", an Iranian movie (and winner of the 2012 foreign movie Oscar) yesterday. Man, that was a movie chock-full of soul-crushing sadness. Very, very good though. A little tragedy that unfolds with absolute inevitability, even though none of the characters are actually bad people or want to hurt anybody else. But everybody does end up getting hurt by each other, a lot.
It's a great movie. It was on Netflix here, if it is in the UK too and you guys haven't seen it yet, do catch it.