This is amazing - I am so grateful to you all

Jessimond Southern marriage is definitely correct as it has confirmed to me by her grand-daughter.
He also is known to have lied about his date of birth for military purposes and it is listed as 1904 on one of the military records.
The possibly bigamy/polygamy is interesting. His grand-daughter says that he was stripped of his medals and 'busted down the ranks' at one time. I don't know how best to check out the military records as I only have a basic Ancestry subscription and the occasional use of the local library's FindMyPast. Everything else seems to lead to my credit card!