Thanks for all the replies. KarenM - I wonder if you are right with the name being mis-transcribed. I find it strange that I can't find Susan in the census when it would have been taken about a year after her arrival.
Unfortunately I can't get access to the Barnardos records as I am not a direct descendant. However; the nice woman there sent the information which I original mentioned about Susan. I didn't even know that there was a Susan Haynes. Susans last known address was Crescent Road, Toronto in Feb 1924
The woman at Barnardos also confirmed that James went to Canada and joined the forces... his last known whereabouts was London, Middlesex County, Ontario in 1919
I should say, that Susans siblings Thomas and Mary went to New Brunswick through Middlemore homes. I already have information regarding them. Mary died when she was 17 and Thomas married Lillian Bell. And John (my great-grandad) returned to the UK in 1921 and then married Daisy H Cork, after serving with the Canadian Forces in WW1.