Enjoyed this episode shown on Wednesday.
There was a Cardiff connection. Although his grandfather was born in Ireland, after WW1 he signed on as a merchant seaman and docked at Penarth and Barry on his ship which was ferrying coal. His body was found in the Glamorganshire Canal at Cardiff during April 1927, he was taken to a Mining Hospital and buried in an unmarked grave in Cathays Cemetery.
The cause of death as stated on his death certificate was 'Shock from distended stomach acting on diseased heart'. It was inferred by a lady from Glamorganshire Archives that he had a heart attack and fell into the canal. However, I've found that the Register of Deceased Seamen paints a slightly different picture stating that the cause was 'Shock from falling into canal'.