Wow! I never imagined such a positive response - many thanks to everyone who has contributed.
I should have made it clear that Charles returned and lived until 1960 - he is buried in Westbury.
Unfortunately there are no photos that I am aware of but I'll put the feelers out amongst the legion of Hemmens cousins & report back if I find anything useful.
Liverpool Annie: Fortunately, non of those Hemmens' are mine.
mmm45: All of the Winscombe Hemmens' are familiar names to me and I suspect that they are related to Charles [and me] in some way; however, a brick wall in my research prevents me from making a positive link. Thanks for the information - I wasn't aware that this site held so much information.