Wow!
The twist in this adaption was pure brilliance! The children appeared to be trapped by The Woman in Black even after she manipulates their deaths; those spirits where gaunt, grey and in turmoil. In contrast, Arthur's boy in death, looked healthy and calm, and free to go with his father and mother. Although Jennet Humphrey still refused to forgive and mercilessly hunted another innocent child, I wonder if Arthur's empathy and willingness to reunite Jennet with Nathaniel, promoted her release of Joseph in death. That's my impression, someone else might've come away with a different interpretation.
Dan Radcliffe gave a wonderful performance, utterly convincing as Arthur!
I do think Jennet Humphrey's ghost in the 1989 TV adaption was more menacing and chilling, perhaps because they relied to a greater extent on the lady's acting (facial expressions and sheer presence) with some make-up, as opposed to special effects.
I've read the novel, seen the sensational theatre production, plus the 1989 TV production, however the lights going out step by step down the hall and the stain spreading across the bed where the boy emerged from, had a slight semblance to Ju-on (the Grudge films). So, I won't be surprised to learn if the Hammer productions used some aspects they knew might appeal to the new (younger) generations they are introducing themselves too. There was the typical Hammer Horror fashion to be found, namely the villagers reaction to a new face, plus particular sound effects.