Hello
I had found Lettice on Ancestry and contacted Kerry to see if there was any connection but I have not heard back from her. I will try again as when I used your link it showed that she has a marriage date of 13 May 1880 in Newcastle for Joseph and Harriet.
All certificates about William indicate that he was born in England. His death certificate indicates that he was born in Oldham, England.
Cheers
Jean