Thank You ,Michel. It rather looks as if the Douverain that I was given was in fact the name you know. It may have been easy to interpredt the spelling wrongly.
My dad died in 1982 but I was really pleased to have the group photo last year especially as some of my nephews had suddenly shown an interest in his servcie in WW1 which was gratifying because we, of this age, who were born after 1918 would prefer that families do not forget the sacrifices they made by so many at that time.
With sincere Best Wishes
Norah