@Florida1920 - "he relates seeing a British officer walking in the open between trenches, while enemy machine-gun bullets were spattering all around. Walking, not running."
That was entirely normal behaviour for professional British officers. They didn't duck under enemy fire.
If you read General Slim's book "Defeat into Victory" about how he turned the situation around fighting the Japanese in Burma and India, there is a part where he came under mortar or artillery fire (I can't remember which) by the Japanese while he was in the open. Rather than running or "hitting the dirt" (as the movies put it), he simply gritted his teeth and continued to stride forward through a hail of fragments. He could not let himself appear to flinch before enemy fire in front of his men. One of his Gurkha SNCOs saw this and laughed loudly and shouted jokes at him as he knew exactly what was going on (he of course knew British officers as well as anyone).
There are plenty of anecdotes such as this one. Years later when the war movies were made, the directors and writers were told by their consultants (often soldiers who had been there) that their scripts were wrong, and that the British officers who had been at the battles in question did not duck under enemy fire. The directors however would decide that the film would be more exciting and the scene look more dangerous if the heroes were seen to be dodging the bullets rather than just striding forward with their chin up. Read the books by the people who were there, and you get a very different story from the movies.