Originally all I was told was that his name was Edward Leopold Johnson Jay and that he had been interned in WW1 and then separated from my grandmother Eliza. Later I found my father's birth certificate (London, 1907) but curiously the surname given was Johnson (no Jay). Through the Red Cross in Geneva I found where he had been interned (under the name Edward Leopold Jay) and that he had been born in Insterburg, East Prussia in 1871. Then in the 1911 census I found him (as Edward Leopold Jay) and Eliza and my father (their son aged 7) living in Newport where he was a master tailor.
But he and Eliza separated shortly after WW1 and I am wondering what happened to him. Of course, he could have gone say to the US or to Germany, or he may have lived in England. The 1940 death of an Edward Leonard Jay, a retired master tailor is intriguing but I would like to prove that it was him. He may have had another family with Marie Jay, I suppose.