This one has some interesting links. Have a look at this one:
http://www.leedsww1memorials.com/hunsletalfcooke.htm
It mentions our H Bailey, but as there were 3 H Baileys with a Leeds connection they're not sure which one is referred to here.
Arthur - Herbert's attestation papers show he was a wireworker, so I don't think he'd work in a Printers, so I guess that's not the right one. I did wonder if the monument was in Sussex but, like you, I've not found any reference to one there. One of my son's ex partners lives in Sussex so I could always send her a copy of the photo to see if she's seen it anywhere. She lives about 18 miles from Seaford and I know they often go to the beach in the summer.
Frank - looking at the Green Howards regimental badge, to me it doesn't look the same as the one on the memorial. The one on the memorial seems to be more curved at the bottom, whereas the Green Howards badge has two straight pieces coming together with a flower (Yorkshire Rose?) at the bottom.
Malky - thank you for the links, I've saved them both. The 2nd one is easier to search, but I've not found the monument yet Herbert's name is not on the list of men on the long lost Leeds WWI memorial. I wonder if the memorial was a plaque rather than a stone monument as the report does say having been lost for many years it was then passed on to another church. You couldn't pass on a stone monument.
The other possibility, of course, is that the memorial has nothing to do with my ancestors. The photo looks staged - for a newspaper or something - with the women "placed" by the monument and the young boys leaning against the side of it. That is not how you would take a photo of a monument which had the name of your loved on on it. Most non photographers would just have had the women standing at the side of the monument. I'll check newspaper archives in case there is something there. Going on the clothing of the women, they look as though they are wearing 1920s clothes, look at the hat and low waist on the older woman standing.