- While a Lieutenant-Colonel in the British Army, he was one of the Prosecuting Officers at the British-mounted 1945 Belsen War Crimes trial.
- His surname was pronounced with a hard "G" (like "Glen" without the "L" sound).
- Was in five Oscar Best Picture nominees Pygmalion (1938), Henry V (1944), The Snake Pit (1948), Quo Vadis (1951) and The Longest Day (1962), over four different decades.
- He did the narration on a short film called Clearing the Lines.
- His performances were often criticized as bland.
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