I have just come across this thread and thought I would look to see if I could find any information on William Herbert Hughes after 1922.
There is a Family Tree on Ancestry for William Herbert Hughes born 29 April 1896, Liverpool, plus for his wife, Ellen Elizabeth Byatt, born 1900, Godley Brook, Dilhorne, Staffs. This ends in 1922 on his marriage.
There is no further information after this date, same for his wife. It shows "death unknown". I cannot find a death for his wife either. I tried a search to see if there were any births registered for children, surname Hughes, mother's maiden name Byatt, nothing came up on FreeBMD.
It looks likely that they emigrated, or left the Llandudno area at least. The Llandudno Street Directories, or Commercial, directories may reveal where the family members lived over the years. These are held in Llandudno library as well as the archives.
The Family Tree shows William Herbert Hughes had siblings as follows:
John Howard Jones Hughes 1885-1937
Margaret Ann Hughes 1887-1956
Gwladys Hughes 1890-1959
Jane Hughes 1894-1928
Robert Edward Hughes 1899-1937
Gwenneth Myfanwy Hughes 1904-1981
Alun Aled Hughes 1905-1954
The siblings all died in North Wales, Jane in Llandudno, John in Conwy, Robert in Llandudno, Alun in Caernarfon, Margaret in Llandudno (shown as having died at 15 Alexandra Road, Llandudno)Gwladys in Conwy, Gwenneth in Llandudno.
I don't know if you have tried to trace the descendants of the siblings to see if they can help with information on William Herbert Hughes.
It occurred to me that you may be the person with the tree on Ancestry, so apologies if I have provided information you have already.
Helig.