I have searched Ancestry but cannot find any emigration travel records that are definitely for William Herbert Hughes. There are very many for William Hughes but it would take for ever to research them all.
There are people with this family in their trees on Genes Reunited. I am a member of this and a search of other members' trees for this family shows quite a few people who have them in their lines. It is possible to make contact with these people but this might be better for PhilMick to pursue.
Something that struck me as odd was that on the page for Robert Edward Hughes on one Ancestry Family Tree, it has a photo of his gravestone in St Tudno's, he was buried with J Herbert Hodson d1929, aged 37 and Margaret Ann Hodson d1958, aged 68. I looked some more and found that Margaret Ann Hughes, sister of Robert, married Joseph Herbert Hodson. So Robert was buried with his sister and her husband.
Margaret Hughes had two children with her husband, Joseph Hodson. A son was born and died in 1916, a daughter,Margery Joyce Hodson born 1917 (7 Alexandra Road) and died 1994 in The Great Orme Nursing Home, Great Orme's Road. Margery married Roland Albert Heath who died in Chester in 1996.
The family has such strong connection with Llandudno and Alexandra Road, there must be at least a few local people who would have knowledge of them. Whether anyone knows about William Herbert Hughes is another matter.
Helig.