Losing a great uncle in WW1 who l never knew this episode is so hard to watch without crying. Edward returns and obviously suffering from shell shock sadly we didn't know about PTSD then. Sadly, many of our soldiers were shot at dawn for cowardice without us knowing what they were going through thankfully all exonerated now. Also covers explosion in munitions factory there was one at Silvertown although not mentioned by name an explosion occurred in Silvertown in West Ham, Essex (now part of the London Borough of Newham, in Greater London) on Friday, 19 January 1917 at 6:52 pm. The blast occurred at a munitions factory that was manufacturing explosives for Britain 's First World War military effort. . Fabulous episode I was about thirteen when Upstairs and Downstairs started remembering some episodes well other l have forgot about. Classic timeless drama that you can watch time and time again and never tire of.