Perhaps it was the result of a long and fraught few months. Perhaps I was just tired. But I came home from Sam Mendes' movie, 1917 , hardly able to speak or to articulate my feelings about it. But a week later, and some time to think and I'm a little more cogent, at least to myself. I know something about the First World War, or at least, I am as conversant as a lifetime of books and films and documentaries would allow me to be. I had a few relatives who served, but none who ever talked much about it, so my imagination of what it might be like - on a personal level - for the millions of Tommies and Jerries who suffered through it was, I now realise, limited. Sam Mendes rectified that. The movie tells a fairly simple, linear story. Lance Corporal Tom Blake (Dean-Charles Chapman) is serving in the trenches of France in April, 1917 when, because all communication lines have been cut, he is ordered to take a message to the commanding officer of another regiment, i...