Martin,
Wow, you have done a lot of research. Unfortunately I have not researched my family tree very much but came across this conversation by chance after recognising the names Ethel and Albert were my great grandparents names and was surprised to see my name appearing. I had started a family tree on geni and think they share info to find matches.
I know Albert and Ethel lived in Ardleigh Green, Hornchurch, Essex and had horses as
my grandad (Albert Reginald Howgego b1919) told me how he would hide under their horse when he was in trouble as his mum (Ethel) didn't like them. My grandad had a sister called Connie (must be Ethel Constance Howgego, who married Benfield ) but they lost contact.
My mum reports that her grandad did crawl some distance after being wounded during WW1 but wasnt aware of the full details.
I 'interviewed' my grandparents when I was younger so I will try to find it to see if I learn anything about his uncles, aunts or grandparents, and see if they line up with any of your names. I will post on here if I find anything out.
Caroline b1985