Hi Bob,
Thanks for sharing the lovely photo of Madge, it's good to put a face to a name.
You mentioned a few weeks ago that you bumped into your mother's sister, I wonder if it's possible to have another chat with her. As we have found, the smallest snippet of information can lead to another avenue of research. Often people remember small things which they don't feel are important enough to mention, but can sometimes come out in a casual chat.
I believe we have found the right man, but from your recent posts I can now see why you feel circumstantial evidence is not enough. We'll keep plodding on