William's parents are actually Henry & Matilda Davies. She's incorrecty listed as Martha on occasion.
Henry born 1852 in Warkleigh Devon & Matilda born 1859 in Cardiff.
I had a record of William Henry's marriage to Emma Hazell but I'd never looked into her background. Interesting to see they were also living in Ruby Street!
Can I just check - Emma is listed in Monmouth on the 1911 census along with her son, Henry James Heathfield? But no husband, William Henry? Is that what you've found?
Cheers,
Mark