A grim film

A good one but grim - don't think I'll watch it again. The mechanics of the process of killing someone as quickly, kindly(?) and efficiently as possible is in stark contrast to the way it's usually depicted.
I think the whole film is low-key and calm on the surface and Timothy Spall and Juliet Stevenson are very good together but there is no real attempt to show how or why he could do such a job and perhaps that's for the best - because we don't really know. The ending felt a little rushed but I'm not sure how else you close off the story. The ending as described in Wikipedia (a dispute over unpaid fees) probably doesn't reflect the real reasons either.
We also don't know if the statement at the end was Pierrepoint's definitive point of view in later years or just a selective quote.
Which all adds up to a lot of 'don't knows' but perhaps that makes it a more interesting film.