Harold John Badcock was born in 1888 at Boxmoor, Hemel Hempstead, the son of Francis and Marian Badcock. His father was the principal teacher at Boxmoor School.
On the 1891 Census the family were living at School House, St John's Road, Hemel Hempstead, where his father was a teacher at the Elementary School. His mother was also listed as a Teacher. They remained living at the School House in 1901.
By the 1911 Census Harold had moved out of the family home and was living as a boarder at the home of Alfred and Rose Wesley at 59 Cranwell Road, Lincoln and was employed as a Police Constable for the County Constabulary.
He married Hilda Gladys Frogley on 12 October 1915 at Hemel Hempstead.