Hi Lynette,
You clever thing.
I haven't found my William - but, at least your link has taken me to the site where I found the photo originally. Thankyou so much for that, it was annoying me that I hadn't kept a note.
I have attached a link to the website photo with its caption (just for interest sake), which also shows me why I thought it was WW2 - it is dated 1941.
http://www.rootschat.com/links/0166u In answer to your query Ruskie - no, I don't have any info which would make me think that William did serve in WW2 at all - in fact, I don't know if he was alive still at that time. He did serve in WW1 but later crewed on a ship to Halifax, Canada in 1929 and I haven't been able to trace him after that.
However, after finding a later Prince David crewlist which recorded amongst its number a William Wilson of the right age at the time of the list, I hunted for photos or documents which might show the man concerned. The photo I posted on here does not name the individuals, so I can't even say who my man of interest was, just noticed a similarity.
In 1941 my William would have been about 47 or 48 so probably still too old to be the man in the photo.
I think I'll try and find clues to his whereabouts (or death, if necessary) before I post any message on the military board as he may never served in WW2, I just don't know.
Thanks to everyone who has commented on my very foggy search and to Lynette for pointing me to where I found the photo to start with.
Regards Eliza