The photo of my father is a close-up from a larger snap in which he is sitting with my mother. It was taken in 'The Canteen Club' in (I think) Fort Chambly, near the town of Werl in Germany. Here is the full photograph:  

Here is a summary of what I have learned, including information sent to me Canadian ex-service personnel:
He was/is Canadian and most likely French Canadian (this is what my mother believes anyway).
He was a Private with the Royal Canadian Army Medical Corps (RCAMC) when he met my mother.

He would (most likely) have been born between 1915 and 1925.

His first name was (according to my mother) Andrew, though he might also be known by the French equivalent, Andre (SURNAME UNKNOWN).

I have been told that his uniform identifies him (apart from being in the RCAMC) as wearing a "Group B Tradesman" patch (or possibly a qualified Tradesman, Class II).

He was (very possibly) with 1 Field Ambulance, stationed at Fort Anne (one of a number of bases near the towns of Werl and Soest in North Germany in 1956. My mother met him there in 1956 while working for the WVS. Her name was then Sheila MacAllister

The photo above shows them sitting together in the canteen (presumably at Fort Anne, though it may have been Fort Chambly).

I was born in London in 1957 and brought up in Dublin, Ireland, by my mother and grandparents. My name, Granier, is French, BUT IT IS NOT MY FATHER'S SURNAME. My mother chose it by Deed Poll after I was born. I had a happy and secure childhood, and never felt acutely conscious of my father's absence. However, as I grow older that absence is becoming more pronounced, a presence in its own right. And the fact that I have one haunting photograph of him (and that he looks strikingly like me) makes my search seem still more imperative.