William was given his mother's maiden name as his middle name and seems to have used it throughout his life. He appears to have been the only Le Gros Denziloe as both his sisters and his wife were just plain Denziloes. Without any heirs the Le Gros Denziloe name seems to have started and finished with William.

Like his father before him he was a medical doctor and, after starting his practice in West Allington moved to London, Kent & Suffolk.

He inherited what is now Yew Tree Cottages and an orchard opposite it on the High St (now St James Rd) from his aunt Mary Anna Denziloe in 1879 when he was 36. A year later he converted Yew Tree Cottages' CopyholdType of feudal land tenure
with duties and obligations
to the Lord of the ManorType of feudal land tenure
with duties and obligations
to the Lord of the Manor lease he'd inherited into a Freehold by paying Edwin Slade, Lord of the Manor of Slape, £29. The next day he sold the freehold on Yew Tree Cottage to James Cleall for £120 and the orchard to William Read for £140.

A few years later he'd left Dorset and moved to London but he appears to have kept some links with the area because in the 1904 Electoral Register his "Place of Abode" is listed as "West Allington, Bridport" and he qualifies to vote because he owns some "Freehold Land" which is named as "Callington" (possibly now Springfield House).

In 1907 when he was 64 he married Winifred Harris who was some forty years his junior. The 1911 census shows them living in an eight-roomed house called The Beeches in Kessingland, Suffolk with a cook, Elsie May Bowen, who was the same age as Winifred and the magnificently named Pemley Raven, a 21 year old housemaid.

He was staying at the Grand Hotel in Felixtowe on the 3rd September 1914 when he died, aged 72, by which time he was, according to his will, living at 6 Faraday Mansions, West Kensington Middlesex. Although he had no children Winifred went on to remarry and had three with her second husband.