Based on the real-life story of wartime pilot Richard Hillary who was badly burned when his fighter plane crashed.
Fiona Gillies was not permitted to see Nigel Havers' burned-face makeup until the scene in which her character first sees it, the better to capture a genuine horrified reaction.
In the original novel by Christopher Matthew, Bunty Morrell's first name was spelled Bunny.
The end credits tune is the WW1 ditty "The Bells of Hell Go Ting-a-ling-a-ling" which is conversely upbeat in comparison to the subject matter.