Thank you everyone for your thoughts. I had thought about 1914/15 as that is the date the album was started by the album owner.
James's wife Alice didn't die until after him so she should be in the photo too but I guess there are many reasons why she wouldn't be, if she isn't.
They had had three surviving children by then, Victor Cyril James 1894 (married 1925), Alva Amelia 1899 and Wesley Arthur 1903. So none of them are the adults obviously.
There are lots of other photos (some taken the same day) with various formations of the same people, so far all I've been able to work out is that the couple on the right are the parents of the middle girl and the two young boys in the front.
The young boy in white on the left is in another photo with the woman next to him and in yet another photo with the young woman sitting on the ground on the right.
So far I have no siblings for James Williams so I don't know if the men are his brothers although I don't think they look to be old enough. His wife Alice had 3 sisters & 5 brothers so they could be any of them, lots more work needed I reckon.
I just wanted to confirm the date of the photo to make sure I was on the right track, thanks again all.